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2012-05-23Merge branch 'x86-fpu-for-linus' of ↵Linus Torvalds1-3/+0
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull fpu state cleanups from Ingo Molnar: "This tree streamlines further aspects of FPU handling by eliminating the prepare_to_copy() complication and moving that logic to arch_dup_task_struct(). It also fixes the FPU dumps in threaded core dumps, removes and old (and now invalid) assumption plus micro-optimizes the exit path by avoiding an FPU save for dead tasks." Fixed up trivial add-add conflict in arch/sh/kernel/process.c that came in because we now do the FPU handling in arch_dup_task_struct() rather than the legacy (and now gone) prepare_to_copy(). * 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86, fpu: drop the fpu state during thread exit x86, xsave: remove thread_has_fpu() bug check in __sanitize_i387_state() coredump: ensure the fpu state is flushed for proper multi-threaded core dump fork: move the real prepare_to_copy() users to arch_dup_task_struct()
2012-05-22Merge branch 'sched-core-for-linus' of ↵Linus Torvalds1-26/+0
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull scheduler changes from Ingo Molnar: "The biggest change is the cleanup/simplification of the load-balancer: instead of the current practice of architectures twiddling scheduler internal data structures and providing the scheduler domains in colorfully inconsistent ways, we now have generic scheduler code in kernel/sched/core.c:sched_init_numa() that looks at the architecture's node_distance() parameters and (while not fully trusting it) deducts a NUMA topology from it. This inevitably changes balancing behavior - hopefully for the better. There are various smaller optimizations, cleanups and fixlets as well" * 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched: Taint kernel with TAINT_WARN after sleep-in-atomic bug sched: Remove stale power aware scheduling remnants and dysfunctional knobs sched/debug: Fix printing large integers on 32-bit platforms sched/fair: Improve the ->group_imb logic sched/nohz: Fix rq->cpu_load[] calculations sched/numa: Don't scale the imbalance sched/fair: Revert sched-domain iteration breakage sched/x86: Rewrite set_cpu_sibling_map() sched/numa: Fix the new NUMA topology bits sched/numa: Rewrite the CONFIG_NUMA sched domain support sched/fair: Propagate 'struct lb_env' usage into find_busiest_group sched/fair: Add some serialization to the sched_domain load-balance walk sched/fair: Let minimally loaded cpu balance the group sched: Change rq->nr_running to unsigned int x86/numa: Check for nonsensical topologies on real hw as well x86/numa: Hard partition cpu topology masks on node boundaries x86/numa: Allow specifying node_distance() for numa=fake x86/sched: Make mwait_usable() heed to "idle=" kernel parameters properly sched: Update documentation and comments sched_rt: Avoid unnecessary dequeue and enqueue of pushable tasks in set_cpus_allowed_rt()
2012-05-21Merge branch 'smp-hotplug-for-linus' of ↵Linus Torvalds6-86/+22
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull smp hotplug cleanups from Thomas Gleixner: "This series is merily a cleanup of code copied around in arch/* and not changing any of the real cpu hotplug horrors yet. I wish I'd had something more substantial for 3.5, but I underestimated the lurking horror..." Fix up trivial conflicts in arch/{arm,sparc,x86}/Kconfig and arch/sparc/include/asm/thread_info_32.h * 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (79 commits) um: Remove leftover declaration of alloc_task_struct_node() task_allocator: Use config switches instead of magic defines sparc: Use common threadinfo allocator score: Use common threadinfo allocator sh-use-common-threadinfo-allocator mn10300: Use common threadinfo allocator powerpc: Use common threadinfo allocator mips: Use common threadinfo allocator hexagon: Use common threadinfo allocator m32r: Use common threadinfo allocator frv: Use common threadinfo allocator cris: Use common threadinfo allocator x86: Use common threadinfo allocator c6x: Use common threadinfo allocator fork: Provide kmemcache based thread_info allocator tile: Use common threadinfo allocator fork: Provide weak arch_release_[task_struct|thread_info] functions fork: Move thread info gfp flags to header fork: Remove the weak insanity sh: Remove cpu_idle_wait() ...
2012-05-18tilegx: enable SYSCALL_WRAPPERS supportChris Metcalf1-0/+1
Some discussion with the glibc mailing lists revealed that this was necessary for 64-bit platforms with MIPS-like sign-extension rules for 32-bit values. The original symptom was that passing (uid_t)-1 to setreuid() was failing in programs linked -pthread because of the "setxid" mechanism for passing setxid-type function arguments to the syscall code. SYSCALL_WRAPPERS handles ensuring that all syscall arguments end up with proper sign-extension and is thus the appropriate fix for this problem. On other platforms (s390, powerpc, sparc64, and mips) this was fixed in 2.6.28.6. The general issue is tracked as CVE-2009-0029. Cc: <stable@vger.kernel.org> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-05-16fork: move the real prepare_to_copy() users to arch_dup_task_struct()Suresh Siddha1-3/+0
Historical prepare_to_copy() is mostly a no-op, duplicated for majority of the architectures and the rest following the x86 model of flushing the extended register state like fpu there. Remove it and use the arch_dup_task_struct() instead. Suggested-by: Oleg Nesterov <oleg@redhat.com> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Link: http://lkml.kernel.org/r/1336692811-30576-1-git-send-email-suresh.b.siddha@intel.com Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: David Howells <dhowells@redhat.com> Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Chris Zankel <chris@zankel.net> Cc: Richard Henderson <rth@twiddle.net> Cc: Russell King <linux@arm.linux.org.uk> Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Mark Salter <msalter@redhat.com> Cc: Aurelien Jacquiot <a-jacquiot@ti.com> Cc: Mikael Starvik <starvik@axis.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Tony Luck <tony.luck@intel.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Jonas Bonn <jonas@southpole.se> Cc: James E.J. Bottomley <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Chen Liqin <liqin.chen@sunplusct.com> Cc: Lennox Wu <lennox.wu@gmail.com> Cc: David S. Miller <davem@davemloft.net> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2012-05-16arch/tile: apply commit 74fca9da0 to the compat signal handling as wellChris Metcalf1-7/+5
This passes siginfo and mcontext to tilegx32 signal handlers that don't have SA_SIGINFO set just as we have been doing for tilegx64. Cc: stable@vger.kernel.org Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-05-16arch/tile: fix up some issues in calling do_work_pending()Chris Metcalf4-27/+68
First, we were at risk of handling thread-info flags, in particular do_signal(), when returning from kernel space. This could happen after a failed kernel_execve(), or when forking a kernel thread. The fix is to test in do_work_pending() for user_mode() and return immediately if so; we already had this test for one of the flags, so I just hoisted it to the top of the function. Second, if a ptraced process updated the callee-saved registers in the ptregs struct and then processed another thread-info flag, we would overwrite the modifications with the original callee-saved registers. To fix this, we add a register to note if we've already saved the registers once, and skip doing it on additional passes through the loop. To avoid a performance hit from the couple of extra instructions involved, I modified the GET_THREAD_INFO() macro to be guaranteed to be one instruction, then bundled it with adjacent instructions, yielding an overall net savings. Reported-By: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-05-09sched/numa: Rewrite the CONFIG_NUMA sched domain supportPeter Zijlstra1-26/+0
The current code groups up to 16 nodes in a level and then puts an ALLNODES domain spanning the entire tree on top of that. This doesn't reflect the numa topology and esp for the smaller not-fully-connected machines out there today this might make a difference. Therefore, build a proper numa topology based on node_distance(). Since there's no fixed numa layers anymore, the static SD_NODE_INIT and SD_ALLNODES_INIT aren't usable anymore, the new code tries to construct something similar and scales some values either on the number of cpus in the domain and/or the node_distance() ratio. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Anton Blanchard <anton@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: David Howells <dhowells@redhat.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: linux-alpha@vger.kernel.org Cc: linux-ia64@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-sh@vger.kernel.org Cc: Matt Turner <mattst88@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Richard Henderson <rth@twiddle.net> Cc: sparclinux@vger.kernel.org Cc: Tony Luck <tony.luck@intel.com> Cc: x86@kernel.org Cc: Dimitri Sivanich <sivanich@sgi.com> Cc: Greg Pearson <greg.pearson@hp.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: bob.picco@oracle.com Cc: chris.mason@oracle.com Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/n/tip-r74n3n8hhuc2ynbrnp3vt954@git.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-05-08Merge branch 'smp/threadalloc' into smp/hotplugThomas Gleixner4-29/+8
Reason: Pull in the separate branch which was created so arch/tile can base further work on it. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2012-05-08tile: Use common threadinfo allocatorThomas Gleixner2-25/+4
Use the core allocator and deal with the extra cleanup in arch_release_thread_info(). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Chris Metcalf <cmetcalf@tilera.com> Link: http://lkml.kernel.org/r/20120505150142.311126440@linutronix.de
2012-05-05init_task: Replace CONFIG_HAVE_GENERIC_INIT_TASKThomas Gleixner1-1/+0
Now that all archs except ia64 are converted, replace the config and let the ia64 select CONFIG_ARCH_INIT_TASK Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20120503085035.867948914@linutronix.de
2012-05-05tile: Use generic init_taskThomas Gleixner4-60/+18
Same code. Use the generic version. The special Makefile treatment is pointless anyway as init_task.o contains only data which is handled by the linker script. So no point on being treated like head text. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Chris Metcalf <cmetcalf@tilera.com> Link: http://lkml.kernel.org/r/20120503085035.528129988@linutronix.de
2012-04-26smp: Add task_struct argument to __cpu_up()Thomas Gleixner1-1/+1
Preparatory patch to make the idle thread allocation for secondary cpus generic. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Jesper Nilsson <jesper.nilsson@axis.com> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Tony Luck <tony.luck@intel.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: David Howells <dhowells@redhat.com> Cc: James E.J. Bottomley <jejb@parisc-linux.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: David S. Miller <davem@davemloft.net> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Richard Weinberger <richard@nod.at> Cc: x86@kernel.org Link: http://lkml.kernel.org/r/20120420124556.964170564@linutronix.de
2012-04-25arch/tile: fix a couple of functions that should be __initChris Metcalf2-4/+4
They were marked __devinit by mistake, causing some warnings at link time. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-20VM: add "vm_mmap()" helper functionLinus Torvalds1-3/+1
This continues the theme started with vm_brk() and vm_munmap(): vm_mmap() does the same thing as do_mmap(), but additionally does the required VM locking. This uninlines (and rewrites it to be clearer) do_mmap(), which sadly duplicates it in mm/mmap.c and mm/nommu.c. But that way we don't have to export our internal do_mmap_pgoff() function. Some day we hopefully don't have to export do_mmap() either, if all modular users can become the simpler vm_mmap() instead. We're actually very close to that already, with the notable exception of the (broken) use in i810, and a couple of stragglers in binfmt_elf. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-04-11arch/tile: avoid unused variable warning in proc.c for tilegxChris Metcalf1-3/+1
Until we push the unaligned access support for tilegx, it's silly to have arch/tile/kernel/proc.c generate a warning about an unused variable. Extend the #ifdef to cover all the code and data for now. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-09tile/CPU hotplug: Add missing call to notify_cpu_starting()Srivatsa S. Bhat1-0/+2
The scheduler depends on receiving the CPU_STARTING notification, without which we end up into a lot of trouble. So add the missing call to notify_cpu_starting() in the bringup code. Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-06Merge branch 'stable' of ↵Linus Torvalds29-257/+429
git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile Pull arch/tile bug fixes from Chris Metcalf: "This includes Paul Gortmaker's change to fix the <asm/system.h> disintegration issues on tile, a fix to unbreak the tilepro ethernet driver, and a backlog of bugfix-only changes from internal Tilera development over the last few months. They have all been to LKML and on linux-next for the last few days. The EDAC change to MAINTAINERS is an oddity but discussion on the linux-edac list suggested I ask you to pull that change through my tree since they don't have a tree to pull edac changes from at the moment." * 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile: (39 commits) drivers/net/ethernet/tile: fix netdev_alloc_skb() bombing MAINTAINERS: update EDAC information tilepro ethernet driver: fix a few minor issues tile-srom.c driver: minor code cleanup edac: say "TILEGx" not "TILEPro" for the tilegx edac driver arch/tile: avoid accidentally unmasking NMI-type interrupt accidentally arch/tile: remove bogus performance optimization arch/tile: return SIGBUS for addresses that are unaligned AND invalid arch/tile: fix finv_buffer_remote() for tilegx arch/tile: use atomic exchange in arch_write_unlock() arch/tile: stop mentioning the "kvm" subdirectory arch/tile: export the page_home() function. arch/tile: fix pointer cast in cacheflush.c arch/tile: fix single-stepping over swint1 instructions on tilegx arch/tile: implement panic_smp_self_stop() arch/tile: add "nop" after "nap" to help GX idle power draw arch/tile: use proper memparse() for "maxmem" options arch/tile: fix up locking in pgtable.c slightly arch/tile: don't leak kernel memory when we unload modules arch/tile: fix bug in delay_backoff() ...
2012-04-02arch/tile: avoid accidentally unmasking NMI-type interrupt accidentallyChris Metcalf2-7/+36
The return path as we reload registers and core state requires that r30 hold a boolean indicating whether we are returning from an NMI, but in a couple of cases we weren't setting this properly, with the result that we could accidentally unmask the NMI interrupt(s), which could cause confusion. Now we set r30 in every place where we jump into the interrupt return path. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: remove bogus performance optimizationChris Metcalf1-5/+0
We were re-homing the initial task's kernel stack on the boot cpu, but in fact it's better to let it stay globally homed, since that task isn't bound to the boot cpu anyway. This is more of a general cleanup than an actual performance optimization, but it removes code, which is a good thing. :-) Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: return SIGBUS for addresses that are unaligned AND invalidChris Metcalf1-12/+19
Previously we were returning SIGSEGV in this case. It seems cleaner to return SIGBUS since the hardware figures out alignment traps before TLB violations, so SIGBUS is the "more correct" signal. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: fix finv_buffer_remote() for tilegxChris Metcalf1-2/+26
There were some correctness issues with this code that are now fixed with this change. The change is likely less performant than it could be, but it should no longer be vulnerable to any races with memory operations on the memory network while invalidating a range of memory. This code is run infrequently so performance isn't critical, but correctness definitely is. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: use atomic exchange in arch_write_unlock()Chris Metcalf1-1/+1
This idiom is used elsewhere when we do an unlock by writing a zero, but I missed it here. Using an atomic operation avoids waiting on the write buffer for the unlocking write to be sent to the home cache. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: stop mentioning the "kvm" subdirectoryChris Metcalf1-2/+0
It causes "make clean" to fail, for example. Once we have KVM support complete, we'll reinstate the subdir reference. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: export the page_home() function.Chris Metcalf1-0/+1
This avois a bug in modules trying to use the function. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: fix pointer cast in cacheflush.cChris Metcalf1-1/+1
Pragmatically it couldn't be wrong to cast pointers to long to compare them (since all kernel addresses are in the top half of VA space), but it's more correct to cast to unsigned long. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: fix single-stepping over swint1 instructions on tilegxChris Metcalf1-3/+18
If we are single-stepping and make a syscall, we call ptrace_notify() explicitly on the return path back to user space, since we are returning to a pc value set artificially to the next instruction, and otherwise we won't register that we stepped over the syscall instruction (swint1). Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: implement panic_smp_self_stop()Chris Metcalf1-0/+6
This allows the later-panicking tiles to wait in a lower power state until they get interrupted with an smp_send_stop(). Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: add "nop" after "nap" to help GX idle power drawChris Metcalf2-1/+3
This avoids the hardware istream prefetcher doing unnecessary work. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: use proper memparse() for "maxmem" optionsChris Metcalf1-9/+8
This is more standard and avoids having to remember what units the options actually take. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: fix up locking in pgtable.c slightlyChris Metcalf1-10/+12
We should be holding the init_mm.page_table_lock in shatter_huge_page() since we are modifying the kernel page tables. Then, only if we are walking the other root page tables to update them, do we want to take the pgd_lock. Add a comment about taking the pgd_lock that we always do it with interrupts disabled and therefore are not at risk from the tlbflush IPI deadlock as is seen on x86. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: don't leak kernel memory when we unload modulesChris Metcalf1-0/+2
We were failing to track the memory when we allocated it. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: fix bug in delay_backoff()Chris Metcalf1-1/+1
We were carefully computing a value to use for the number of loops to spin for, and then ignoring it. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: fix bug in loading kernels larger than 16 MBChris Metcalf1-6/+15
Previously we only handled kernels up to a single huge page in size. Now we create additional PTEs appropriately. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: don't enable irqs unconditionally in page fault handlerChris Metcalf1-2/+5
If we took a page fault while we had interrupts disabled, we shouldn't enable them in the page fault handler. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: don't set the homecache of a PTE unless appropriateChris Metcalf1-4/+12
We make sure not to try to set the home for an MMIO PTE (on tilegx) or a PTE that isn't referencing memory managed by Linux. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: don't wait for migrating PTEs in an NMI handlerChris Metcalf1-3/+10
Doing so raises the possibility of self-deadlock if we are waiting for a backtrace for an oprofile or perf interrupt while we are in the middle of migrating our own stack page. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile/Makefile: use KCFLAGS when figuring out the libgcc path.Chris Metcalf1-1/+2
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: fix a couple of comments that needed updatingChris Metcalf2-3/+10
Not associated with any code changes, so I'm just lumping these comment changes into a commit by themselves. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: fix up some minor trap handling issuesChris Metcalf2-3/+8
We now respond to MEM_ERROR traps (e.g. an atomic instruction to non-cacheable memory) with a SIGBUS. We also no longer generate a console crash message if a user process die due to a SIGTRAP. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: work around a hardware issue with the return-address stackChris Metcalf3-2/+22
In certain circumstances we need to do a bunch of jump-and-link instructions to fill the hardware return-address stack with nonzero values. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: various bugs in stack backtracerChris Metcalf2-120/+112
Fix a long-standing bug in the stack backtracer where we would print garbage to the console instead of kernel function names, if the kernel wasn't built with symbol support (e.g. mboot). Make sure to tag every line of userspace backtrace output if we actually have the mmap_sem, since that way if there's no tag, we know that it's because we couldn't trylock the semaphore. Stop doing a TLB flush and examining page tables during backtrace. Instead, just trust that __copy_from_user_inatomic() will properly fault and return a failure, which it should do in all cases. Fix a latent bug where the backtracer would directly examine a signal context in user space, rather than copying it safely to kernel memory first. This meant that a race with another thread could potentially have caused a kernel panic. Guard against unaligned sp when trying to restart backtrace at an interrupt or signal handler point in the kernel backtracer. Report kernel symbolic information for the call instruction rather than for the following instruction. We still report the actual numeric address corresponding to the instruction after the call, for the sake of consistency with the normal expectations for stack backtracers. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: make sure to build memcpy_user_64 without frame pointerChris Metcalf2-1/+8
Add a comment explaining why this is important, and add a CFLAGS_REMOVE clause to the Makefile to make sure it happens. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: avoid false corrupt frame warning in early bootChris Metcalf1-1/+1
With lockstat we can end up trying to get a backtrace before "high_memory" is initialized, so don't worry about range testing if it is zero. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: use 0 for IRQ_RESCHEDULE instead of 1Chris Metcalf1-1/+1
This avoids assigning IRQ 0 to PCI devices, because we've seen that doesn't always work well. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: fix gcc 4.6 warnings in <asm/bitops_64.h>Chris Metcalf1-4/+4
Fix some signedness and variable usage warnings in change_bit() and test_and_change_bit(). Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: revert comment for atomic64_add_unless().Chris Metcalf1-1/+1
It still returns whether @v was not @u, not the old value, unlike __atomic_add_unless(). Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> Acked-by: Arun Sharma <asharma@fb.com>
2012-04-02arch/tile: fix typo in <arch/spr_def.h>Chris Metcalf1-2/+2
We aren't yet using this definition in the kernel, but fix it up before someone goes looking for it. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile/Kconfig: don't specify CONFIG_PAGE_OFFSET for 64-bit buildsChris Metcalf1-0/+1
It's fixed at half the VA space and there's no point in configuring it. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile/Kconfig: rename tile_defconfig to tilepro_defconfigChris Metcalf1-1/+4
We switched to using "tilepro" for the 32-bit stuff a while ago, but missed this one usage. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-20 19:35:41 +0000