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2017-01-24xtensa: migrate exception table users off module.h and onto extable.hPaul Gortmaker1-1/+1
This file was only including module.h for exception table related functions. We've now separated that content out into its own file "extable.h" so now move over to that and avoid all the extra header content in module.h that we don't really need to compile this file. Cc: Chris Zankel <chris@zankel.net> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: linux-xtensa@linux-xtensa.org Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2016-12-15xtensa: enable HAVE_DMA_CONTIGUOUSMax Filippov1-0/+2
Enable HAVE_DMA_CONTIGUOUS, reserve contiguous memory at bootmem_init, use dma_alloc_from_contiguous and dma_release_from_contiguous in xtensa_dma_alloc/free. This allows for big contiguous DMA buffer allocation from designated area configured in the device tree. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-10-05Merge tag 'xtensa-20161005' of git://github.com/jcmvbkbc/linux-xtensaLinus Torvalds1-260/+19
Pull Xtensa updates from Max Filippov: "Updates for the xtensa architecture. It is a combined set of patches for 4.8 that never got to the mainline and new patches for 4.9. - add new kernel memory layouts for MMUv3 cores: with 256MB and 512MB KSEG size, starting at physical address other than 0 - make kernel load address configurable - clean up kernel memory layout macros - drop sysmem early allocator and switch to memblock - enable kmemleak and memory reservation from the device tree - wire up new syscalls: userfaultfd, membarrier, mlock2, copy_file_range, preadv2 and pwritev2 - add new platform: Cadence Configurable System Platform (CSP) and new core variant for it: xt_lnx - rearrange CCOUNT calibration code, make most of it generic - improve machine reset code (XTFPGA now reboots reliably with MMUv3 cores) - provide default memmap command line option for configurations without device tree support - ISS fixes: simdisk is now capable of using highmem pages, panic correctly terminates simulator" * tag 'xtensa-20161005' of git://github.com/jcmvbkbc/linux-xtensa: (24 commits) xtensa: disable MMU initialization option on MMUv2 cores xtensa: add default memmap and mmio32native options to defconfigs xtensa: add default memmap option to common_defconfig xtensa: add default memmap option to iss_defconfig xtensa: ISS: allow simdisk to use high memory buffers xtensa: ISS: define simc_exit and use it instead of inline asm xtensa: xtfpga: group platform_* functions together xtensa: rearrange CCOUNT calibration xtensa: xtfpga: use clock provider, don't update DT xtensa: Tweak xuartps UART driver Rx watermark for Cadence CSP config. xtensa: initialize MMU before jumping to reset vector xtensa: fix icountlevel setting in cpu_reset xtensa: extract common CPU reset code into separate function xtensa: Added Cadence CSP kernel configuration for Xtensa xtensa: fix default kernel load address xtensa: wire up new syscalls xtensa: support reserved-memory DT node xtensa: drop sysmem and switch to memblock xtensa: minimize use of PLATFORM_DEFAULT_MEM_{ADDR,SIZE} xtensa: cleanup MMU setup and kernel layout macros ...
2016-07-26mm: do not pass mm_struct into handle_mm_faultKirill A. Shutemov1-1/+1
We always have vma->vm_mm around. Link: http://lkml.kernel.org/r/1466021202-61880-8-git-send-email-kirill.shutemov@linux.intel.com Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-07-24xtensa: support reserved-memory DT nodeMax Filippov1-0/+2
This allows reserving regions of physical memory from the device tree. See Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt for more details. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-07-24xtensa: drop sysmem and switch to memblockMax Filippov1-257/+15
Memblock is the standard kernel boot-time memory tracker/allocator. Use it instead of the custom sysmem allocator. This allows using kmemleak, CMA and device tree memory reservation. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-07-24xtensa: add alternative kernel memory layoutsMax Filippov1-2/+1
MMUv3 is able to support low memory bigger than 128MB. Implement 256MB and 512MB KSEG layouts: - add Kconfig selector for KSEG layout; - add KSEG base address, size and alignment definitions to arch/xtensa/include/asm/kmem_layout.h; - use new definitions in TLB initialization; - add build time memory map consistency checks. See Documentation/xtensa/mmu.txt for the details of new memory layouts. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-07-24xtensa: move kernel mapping addresses into kmem_layout.hMax Filippov1-1/+1
Create a header dedicated to memory layout definitions. Include it from places where these definitions are needed. Express vmalloc area address, VIRTUAL_MEMORY_ADDRESS and KERNELOFFSET through KSEG address. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-03-20Merge tag 'xtensa-next-20160320' of git://github.com/czankel/xtensa-linuxLinus Torvalds3-5/+73
Pull Xtensa updates from Chris Zankel: "Xtensa improvements for 4.6: - control whether perf IRQ is treated as NMI from Kconfig - implement ioremap for regions outside KIO segment - fix ISS serial port behaviour when EOF is reached - fix preemption in {clear,copy}_user_highpage - fix endianness issues for XTFPGA devices, big-endian cores are now fully functional - clean up debug infrastructure and add support for hardware breakpoints and watchpoints - add processor configurations for Three Core HiFi-2 MX and HiFi3 cpus" * tag 'xtensa-next-20160320' of git://github.com/czankel/xtensa-linux: xtensa: add test_kc705_hifi variant xtensa: add Three Core HiFi-2 MX Variant. xtensa: support hardware breakpoints/watchpoints xtensa: use context structure for debug exceptions xtensa: remove remaining non-functional KGDB bits xtensa: clear all DBREAKC registers on start xtensa: xtfpga: fix earlycon endianness xtensa: xtfpga: fix i2c controller register width and endianness xtensa: xtfpga: fix ethernet controller endianness xtensa: xtfpga: fix serial port register width and endianness xtensa: define CONFIG_CPU_{BIG,LITTLE}_ENDIAN xtensa: fix preemption in {clear,copy}_user_highpage xtensa: ISS: don't hang if stdin EOF is reached xtensa: support ioremap for memory outside KIO region xtensa: use XTENSA_INT_LEVEL macro in asm/timex.h xtensa: make fake NMI configurable
2016-03-17mm: remove VM_FAULT_MINORJan Kara1-1/+1
The define has a comment from Nick Piggin from 2007: /* For backwards compat. Remove me quickly. */ I guess 9 years should not be too hurried sense of 'quickly' even for kernel measures. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-03-11xtensa: fix preemption in {clear,copy}_user_highpageMax Filippov1-4/+4
Disabling pagefault makes little sense there, preemption disabling is what was meant. Cc: stable@vger.kernel.org Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-01-15mm: differentiate page_mapped() from page_mapcount() for compound pagesKirill A. Shutemov1-1/+1
Let's define page_mapped() to be true for compound pages if any sub-pages of the compound page is mapped (with PMD or PTE). On other hand page_mapcount() return mapcount for this particular small page. This will make cases like page_get_anon_vma() behave correctly once we allow huge pages to be mapped with PTE. Most users outside core-mm should use page_mapcount() instead of page_mapped(). Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Tested-by: Sasha Levin <sasha.levin@oracle.com> Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: Jerome Marchand <jmarchan@redhat.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Steve Capper <steve.capper@linaro.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-01-11xtensa: support ioremap for memory outside KIO regionMax Filippov2-1/+69
Map physical memory outside KIO region into the vmalloc area. Unmap it with vunmap. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2015-08-17xtensa: count software page fault perf eventsMax Filippov1-0/+7
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2015-05-19mm/fault, arch: Use pagefault_disable() to check for disabled pagefaults in ↵David Hildenbrand1-2/+2
the handler Introduce faulthandler_disabled() and use it to check for irq context and disabled pagefaults (via pagefault_disable()) in the pagefault handlers. Please note that we keep the in_atomic() checks in place - to detect whether in irq context (in which case preemption is always properly disabled). In contrast, preempt_disable() should never be used to disable pagefaults. With !CONFIG_PREEMPT_COUNT, preempt_disable() doesn't modify the preempt counter, and therefore the result of in_atomic() differs. We validate that condition by using might_fault() checks when calling might_sleep(). Therefore, add a comment to faulthandler_disabled(), describing why this is needed. faulthandler_disabled() and pagefault_disable() are defined in linux/uaccess.h, so let's properly add that include to all relevant files. This patch is based on a patch from Thomas Gleixner. Reviewed-and-tested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: David.Laight@ACULAB.COM Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: airlied@linux.ie Cc: akpm@linux-foundation.org Cc: benh@kernel.crashing.org Cc: bigeasy@linutronix.de Cc: borntraeger@de.ibm.com Cc: daniel.vetter@intel.com Cc: heiko.carstens@de.ibm.com Cc: herbert@gondor.apana.org.au Cc: hocko@suse.cz Cc: hughd@google.com Cc: mst@redhat.com Cc: paulus@samba.org Cc: ralf@linux-mips.org Cc: schwidefsky@de.ibm.com Cc: yang.shi@windriver.com Link: http://lkml.kernel.org/r/1431359540-32227-7-git-send-email-dahi@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-05-19sched/preempt, mm/kmap: Explicitly disable/enable preemption in kmap_atomic_*David Hildenbrand1-0/+2
The existing code relies on pagefault_disable() implicitly disabling preemption, so that no schedule will happen between kmap_atomic() and kunmap_atomic(). Let's make this explicit, to prepare for pagefault_disable() not touching preemption anymore. Reviewed-and-tested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: David.Laight@ACULAB.COM Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: airlied@linux.ie Cc: akpm@linux-foundation.org Cc: benh@kernel.crashing.org Cc: bigeasy@linutronix.de Cc: borntraeger@de.ibm.com Cc: daniel.vetter@intel.com Cc: heiko.carstens@de.ibm.com Cc: herbert@gondor.apana.org.au Cc: hocko@suse.cz Cc: hughd@google.com Cc: mst@redhat.com Cc: paulus@samba.org Cc: ralf@linux-mips.org Cc: schwidefsky@de.ibm.com Cc: yang.shi@windriver.com Link: http://lkml.kernel.org/r/1431359540-32227-5-git-send-email-dahi@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-01-29vm: add VM_FAULT_SIGSEGV handling supportLinus Torvalds1-0/+2
The core VM already knows about VM_FAULT_SIGBUS, but cannot return a "you should SIGSEGV" error, because the SIGSEGV case was generally handled by the caller - usually the architecture fault handler. That results in lots of duplication - all the architecture fault handlers end up doing very similar "look up vma, check permissions, do retries etc" - but it generally works. However, there are cases where the VM actually wants to SIGSEGV, and applications _expect_ SIGSEGV. In particular, when accessing the stack guard page, libsigsegv expects a SIGSEGV. And it usually got one, because the stack growth is handled by that duplicated architecture fault handler. However, when the generic VM layer started propagating the error return from the stack expansion in commit fee7e49d4514 ("mm: propagate error from stack expansion even for guard page"), that now exposed the existing VM_FAULT_SIGBUS result to user space. And user space really expected SIGSEGV, not SIGBUS. To fix that case, we need to add a VM_FAULT_SIGSEGV, and teach all those duplicate architecture fault handlers about it. They all already have the code to handle SIGSEGV, so it's about just tying that new return value to the existing code, but it's all a bit annoying. This is the mindless minimal patch to do this. A more extensive patch would be to try to gather up the mostly shared fault handling logic into one generic helper routine, and long-term we really should do that cleanup. Just from this patch, you can generally see that most architectures just copied (directly or indirectly) the old x86 way of doing things, but in the meantime that original x86 model has been improved to hold the VM semaphore for shorter times etc and to handle VM_FAULT_RETRY and other "newer" things, so it would be a good idea to bring all those improvements to the generic case and teach other architectures about them too. Reported-and-tested-by: Takashi Iwai <tiwai@suse.de> Tested-by: Jan Engelhardt <jengelh@inai.de> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> # "s390 still compiles and boots" Cc: linux-arch@vger.kernel.org Cc: stable@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-10-21xtensa: nommu: clean up memory map dumpMax Filippov1-1/+7
noMMU configuration doesn't use special area for vmalloc allocations, don't print it in the memory map. PAGE_OFFSET is fixed to 0 in noMMU, use min_low_pfn and max_low_pfn for lowmem range display. Make all XCHAL_KSEG_* constants unsigned long for consistency with other addresses. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-10-21xtensa: nommu: reserve memory below PLATFORM_DEFAULT_MEM_STARTMax Filippov1-0/+11
Memory accounting code can't handle pages below PLATFORM_DEFAULT_MEM_START. Reserve those pages if they exist. When PLATFORM_DEFAULT_MEM_START is zero reserve one page at address 0 to make sure that successfull memory allocations don't return NULL. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-10-21xtensa: nommu: don't build most of the cache flushing codeMax Filippov1-2/+2
Most cache flushing code is only relevant for MMU. Don't build it for nommu configuration. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-08-14xtensa: support highmem in aliasing cache flushing codeMax Filippov1-10/+6
Use __flush_invalidate_dcache_page_alias with alias set to color of the page physical address instead of __flush_invalidate_dcache_page: this works for high memory pages and mapping/unmapping to the TLBTEMP area is virtually free. Allow building configurations with aliasing cache and highmem enabled. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-08-14xtensa: support aliasing cache in kmapMax Filippov1-0/+18
Define ARCH_PKMAP_COLORING and provide corresponding macro definitions on cores with aliasing data cache. Instead of single last_pkmap_nr maintain an array last_pkmap_nr_arr of pkmap counters for each page color. Make sure that kmap maps physical page at virtual address with color matching its physical address. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-08-14xtensa: support aliasing cache in k[un]map_atomicMax Filippov1-7/+10
Map high memory pages at virtual addresses with color that match color of their physical address. Existing cache alias management mechanisms may be used with such pages. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-08-14xtensa: implement clear_user_highpage and copy_user_highpageMax Filippov2-64/+115
Existing clear_user_page and copy_user_page cannot be used with highmem because they calculate physical page address from its virtual address and do it incorrectly in case of high memory page mapped with kmap_atomic. Also kmap is not needed, as most likely userspace mapping color would be different from the kmapped color. Provide clear_user_highpage and copy_user_highpage functions that determine if temporary mapping is needed for the pages. Move most of the logic of the former clear_user_page and copy_user_page to xtensa/mm/cache.c only leaving temporary mapping setup, invalidation and clearing/copying in the xtensa/mm/misc.S. Rename these functions to clear_page_alias and copy_page_alias. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-08-14xtensa: allow fixmap and kmap span more than one page tableMax Filippov1-16/+22
To support aliasing cache both kmap region sizes are multiplied by the number of data cache colors. After that expansion page tables that cover kmap regions may become larger than one page. Correctly allocate and initialize page tables in this case. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-08-14xtensa: make fixmap region addressing grow with indexMax Filippov1-3/+3
It's much easier to reason about alignment and coloring of regions located in the fixmap when fixmap index is just a PFN within the fixmap region. Change fixmap addressing so that index 0 corresponds to FIXADDR_START instead of the FIXADDR_TOP. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-06-09xtensa: fix sysmem reservation at the end of existing blockMax Filippov1-1/+1
When sysmem reservation occurs exactly at the end of an existing block that block is deleted, because it is incorrectly included in the range of memblocks to remove. Fix that by skipping such block. Cc: stable@vger.kernel.org Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-04-06xtensa: add HIGHMEM supportMax Filippov5-15/+146
Introduce fixmap area just below the vmalloc region. Use it for atomic mapping of high memory pages. High memory on cores with cache aliasing is not supported and is still to be implemented. Fail build for such configurations for now. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-04-06xtensa: optimize local_flush_tlb_kernel_rangeMax Filippov1-0/+15
Don't flush whole TLB if only a small kernel range is requested. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-04-02xtensa: dump sysmem from the bootmem_initMax Filippov1-0/+12
Debug dump of physical memory configuration. Useful for inspection of resulting memory map, esp. in the presence of memmap= kernel option. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-04-02xtensa: handle memmap kernel optionMax Filippov1-0/+50
This option is useful for reserving memory regions for secondary cores in AMP configurations. Implement the following memmap variants: - memmap=nn[KMG]@ss[KMG]: force usage of a specific region of memory; - memmap=nn[KMG]$ss[KMG]: mark specified memory as reserved; - memmap=nn[KMG]: set end of memory. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-04-02xtensa: keep sysmem banks ordered in mem_reserveMax Filippov1-32/+50
Rewrite mem_reserve so that it keeps bank order. Also make its return code more traditional. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-04-02xtensa: keep sysmem banks ordered in add_sysmem_bankMax Filippov1-5/+98
Rewrite add_sysmem_bank so that it keeps bank order and merges adjacent/overlapping banks. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-04-02xtensa: split bootparam and kernel meminfoMax Filippov1-0/+17
Bootparam meminfo is a bootloader ABI, kernel meminfo is for the kernel bookkeeping, keep them separate. Kernel doesn't care of memory region types, so drop the type field and don't pass it to add_sysmem_bank. Move kernel sysmem structures and prototypes to asm/sysmem.h and sysmem variable and add_sysmem_bank to mm/init.c Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-02-24Merge tag 'xtensa-for-next-20140221-1' into for_nextChris Zankel1-4/+9
Xtensa fixes for 3.14: - allow booting xtfpga on boards with new uBoot and >128MBytes memory; - drop nonexistent GPIO32 support from fsf variant; - don't select USE_GENERIC_SMP_HELPERS; - enable common clock framework support, set up ethoc clock on xtfpga; - wire up sched_setattr and sched_getattr syscalls. Signed-off-by: Chris Zankel <chris@zankel.net>
2014-02-21xtensa: don't pass high memory to bootmem allocatorMax Filippov1-4/+9
This fixes panic when booting on machine with more than 128M memory passed from the bootloader. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-01-19xtensa: fix warning '"CONFIG_OF" is not defined'Max Filippov1-1/+1
The warning only shows up when building MMUv3 configuration with OF support disabled. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-01-15xtensa: remap io area defined in device treeBaruch Siach1-0/+16
Use the simple-bus node to discover the io area, and remap the cached and bypass io ranges. The parent-bus-address value of the first triplet in the "ranges" property is used. This value is rounded down to the nearest 256MB boundary. The length of the io area is fixed at 256MB; the "ranges" property length value is ignored. Other limitations: (1) only the first simple-bus node is considered, and (2) only the first triplet of the "ranges" property is considered. See ePAPR 1.1 §6.5 for the simple-bus node description, and §2.3.8 for the "ranges" property description. Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2014-01-14xtensa: add SMP supportMax Filippov4-22/+28
This is largely based on SMP code from the xtensa-2.6.29-smp tree by Piet Delaney, Marc Gauthier, Joe Taylor, Christian Zankel (and possibly other Tensilica folks). Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
2014-01-14xtensa: fix build warning in 64-bit build environmentMax Filippov1-2/+2
This fixes the following build warnings: arch/xtensa/mm/misc.S: Assembler messages: arch/xtensa/mm/misc.S:143: Warning: value 0xffffffff30000106 truncated to 0x30000106 arch/xtensa/mm/misc.S:197: Warning: value 0xffffffff30000106 truncated to 0x30000106 Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
2013-11-15xtensa: use buddy allocator for PTE tableKirill A. Shutemov1-20/+0
At the moment xtensa uses slab allocator for PTE table. It doesn't work with enabled split page table lock: slab uses page->slab_cache and page->first_page for its pages. These fields share stroage with page->ptl. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Chris Zankel <chris@zankel.net> Acked-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-09-12arch: mm: pass userspace fault flag to generic fault handlerJohannes Weiner1-0/+2
Unlike global OOM handling, memory cgroup code will invoke the OOM killer in any OOM situation because it has no way of telling faults occuring in kernel context - which could be handled more gracefully - from user-triggered faults. Pass a flag that identifies faults originating in user space from the architecture-specific fault handlers to generic code so that memcg OOM handling can be improved. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Michal Hocko <mhocko@suse.cz> Cc: David Rientjes <rientjes@google.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: azurIt <azurit@pobox.sk> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-07-11Merge tag 'xtensa-next-20130710' of git://github.com/czankel/xtensa-linuxLinus Torvalds1-3/+117
Pull Xtensa updates from Chris Zankel. * tag 'xtensa-next-20130710' of git://github.com/czankel/xtensa-linux: (22 commits) xtensa: remove the second argument of __bio_kmap_atomic() xtensa: add static function tracer support xtensa: Flat DeviceTree copy not future-safe xtensa: check TLB sanity on return to userspace xtensa: adjust boot parameters address when INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX is selected xtensa: bootparams: fix typo xtensa: tell git to ignore generated .dtb files xtensa: ccount based sched_clock xtensa: ccount based clockevent implementation xtensa: consolidate ccount access routines xtensa: cleanup ccount frequency tracking xtensa: timex.h: remove unused symbols xtensa: tell git to ignore copied zlib source files xtensa: fix section mismatch in pcibios_fixup_bus xtensa: ISS: fix section mismatch in iss_net_setup arch: xtensa: include: asm: compiling issue, need cmpxchg64() defined. xtensa: xtfpga: fix section mismatch xtensa: remove unused platform_init_irq() xtensa: tell git to ignore generated files xtensa: flush TLB entries for pages of non-current mm correctly ...
2013-07-08xtensa: check TLB sanity on return to userspaceMax Filippov1-0/+113
- check that user TLB mappings correspond to the current page table; - check that TLB mapping VPN is in the kernel/user address range in accordance with its ASID. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
2013-07-03mm/xtensa: prepare for removing num_physpages and simplify mem_init()Jiang Liu1-25/+2
Prepare for removing num_physpages and simplify mem_init(). Signed-off-by: Jiang Liu <jiang.liu@huawei.com> Cc: Chris Zankel <chris@zankel.net> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-07-03mm: concentrate modification of totalram_pages into the mm coreJiang Liu1-1/+1
Concentrate code to modify totalram_pages into the mm core, so the arch memory initialized code doesn't need to take care of it. With these changes applied, only following functions from mm core modify global variable totalram_pages: free_bootmem_late(), free_all_bootmem(), free_all_bootmem_node(), adjust_managed_page_count(). With this patch applied, it will be much more easier for us to keep totalram_pages and zone->managed_pages in consistence. Signed-off-by: Jiang Liu <jiang.liu@huawei.com> Acked-by: David Howells <dhowells@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: <sworddragon2@aol.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Jianguo Wu <wujianguo@huawei.com> Cc: Joonsoo Kim <js1304@gmail.com> Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Michel Lespinasse <walken@google.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Rik van Riel <riel@redhat.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Tang Chen <tangchen@cn.fujitsu.com> Cc: Tejun Heo <tj@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Wen Congyang <wency@cn.fujitsu.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-07-03mm: enhance free_reserved_area() to support poisoning memory with zeroJiang Liu1-2/+2
Address more review comments from last round of code review. 1) Enhance free_reserved_area() to support poisoning freed memory with pattern '0'. This could be used to get rid of poison_init_mem() on ARM64. 2) A previous patch has disabled memory poison for initmem on s390 by mistake, so restore to the original behavior. 3) Remove redundant PAGE_ALIGN() when calling free_reserved_area(). Signed-off-by: Jiang Liu <jiang.liu@huawei.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: <sworddragon2@aol.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: David Howells <dhowells@redhat.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Jianguo Wu <wujianguo@huawei.com> Cc: Joonsoo Kim <js1304@gmail.com> Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Michel Lespinasse <walken@google.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Rik van Riel <riel@redhat.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Tang Chen <tangchen@cn.fujitsu.com> Cc: Tejun Heo <tj@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Wen Congyang <wency@cn.fujitsu.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-07-03mm: change signature of free_reserved_area() to fix building warningsJiang Liu1-1/+1
Change signature of free_reserved_area() according to Russell King's suggestion to fix following build warnings: arch/arm/mm/init.c: In function 'mem_init': arch/arm/mm/init.c:603:2: warning: passing argument 1 of 'free_reserved_area' makes integer from pointer without a cast [enabled by default] free_reserved_area(__va(PHYS_PFN_OFFSET), swapper_pg_dir, 0, NULL); ^ In file included from include/linux/mman.h:4:0, from arch/arm/mm/init.c:15: include/linux/mm.h:1301:22: note: expected 'long unsigned int' but argument is of type 'void *' extern unsigned long free_reserved_area(unsigned long start, unsigned long end, mm/page_alloc.c: In function 'free_reserved_area': >> mm/page_alloc.c:5134:3: warning: passing argument 1 of 'virt_to_phys' makes pointer from integer without a cast [enabled by default] In file included from arch/mips/include/asm/page.h:49:0, from include/linux/mmzone.h:20, from include/linux/gfp.h:4, from include/linux/mm.h:8, from mm/page_alloc.c:18: arch/mips/include/asm/io.h:119:29: note: expected 'const volatile void *' but argument is of type 'long unsigned int' mm/page_alloc.c: In function 'free_area_init_nodes': mm/page_alloc.c:5030:34: warning: array subscript is below array bounds [-Warray-bounds] Also address some minor code review comments. Signed-off-by: Jiang Liu <jiang.liu@huawei.com> Reported-by: Arnd Bergmann <arnd@arndb.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: <sworddragon2@aol.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: David Howells <dhowells@redhat.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Jianguo Wu <wujianguo@huawei.com> Cc: Joonsoo Kim <js1304@gmail.com> Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Michel Lespinasse <walken@google.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Rik van Riel <riel@redhat.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Tang Chen <tangchen@cn.fujitsu.com> Cc: Tejun Heo <tj@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Wen Congyang <wency@cn.fujitsu.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-06-05xtensa: flush TLB entries for pages of non-current mm correctlyMax Filippov1-3/+4
Sometimes under high memory pressure one process gets a page of another process, which manifests itself with an invalid instruction exception. This happens because flush_tlb_page fails to clear TLB entries when called with vma that does not belong to current mm, because it does not set RASID appropriately. When page reclaiming mechanism swaps physical pages out replacing their PTEs with none or swap PTEs, it calls flush_tlb_page. Later physical page may be reused elsewhere, but the stale TLB mapping still refers to it, allowing process that owned the mapping to see the new state of that physical page. Put ASID of the mm that owns vma to the RASID to fix that issue. Also replace otherwise meaningless local_save_flags with local_irq_save. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
2013-05-09Merge tag 'xtensa-next-20130508' of git://github.com/czankel/xtensa-linuxLinus Torvalds1-5/+9
Pull xtensa updates from Chris Zankel: "Support for the latest MMU architecture that allows for a larger accessible memory region, and various bug-fixes" * tag 'xtensa-next-20130508' of git://github.com/czankel/xtensa-linux: xtensa: Switch to asm-generic/linkage.h xtensa: fix redboot load address xtensa: ISS: fix timer_lock usage in rs_open xtensa: disable IRQs while IRQ handler is running xtensa: enable lockdep support xtensa: fix arch_irqs_disabled_flags implementation xtensa: add irq flags trace support xtensa: provide custom CALLER_ADDR* implementations xtensa: add stacktrace support xtensa: clean up stpill_registers xtensa: don't use a7 in simcalls xtensa: don't attempt to use unconfigured timers xtensa: provide default platform_pcibios_init implementation xtensa: remove KCORE_ELF again xtensa: document MMUv3 setup sequence xtensa: add MMU v3 support xtensa: fix ibreakenable register update xtensa: fix oprofile building as module
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