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2008-10-14tracing: Kernel TracepointsMathieu Desnoyers3-1/+149
Implementation of kernel tracepoints. Inspired from the Linux Kernel Markers. Allows complete typing verification by declaring both tracing statement inline functions and probe registration/unregistration static inline functions within the same macro "DEFINE_TRACE". No format string is required. See the tracepoint Documentation and Samples patches for usage examples. Taken from the documentation patch : "A tracepoint placed in code provides a hook to call a function (probe) that you can provide at runtime. A tracepoint can be "on" (a probe is connected to it) or "off" (no probe is attached). When a tracepoint is "off" it has no effect, except for adding a tiny time penalty (checking a condition for a branch) and space penalty (adding a few bytes for the function call at the end of the instrumented function and adds a data structure in a separate section). When a tracepoint is "on", the function you provide is called each time the tracepoint is executed, in the execution context of the caller. When the function provided ends its execution, it returns to the caller (continuing from the tracepoint site). You can put tracepoints at important locations in the code. They are lightweight hooks that can pass an arbitrary number of parameters, which prototypes are described in a tracepoint declaration placed in a header file." Addition and removal of tracepoints is synchronized by RCU using the scheduler (and preempt_disable) as guarantees to find a quiescent state (this is really RCU "classic"). The update side uses rcu_barrier_sched() with call_rcu_sched() and the read/execute side uses "preempt_disable()/preempt_enable()". We make sure the previous array containing probes, which has been scheduled for deletion by the rcu callback, is indeed freed before we proceed to the next update. It therefore limits the rate of modification of a single tracepoint to one update per RCU period. The objective here is to permit fast batch add/removal of probes on _different_ tracepoints. Changelog : - Use #name ":" #proto as string to identify the tracepoint in the tracepoint table. This will make sure not type mismatch happens due to connexion of a probe with the wrong type to a tracepoint declared with the same name in a different header. - Add tracepoint_entry_free_old. - Change __TO_TRACE to get rid of the 'i' iterator. Masami Hiramatsu <mhiramat@redhat.com> : Tested on x86-64. Performance impact of a tracepoint : same as markers, except that it adds about 70 bytes of instructions in an unlikely branch of each instrumented function (the for loop, the stack setup and the function call). It currently adds a memory read, a test and a conditional branch at the instrumentation site (in the hot path). Immediate values will eventually change this into a load immediate, test and branch, which removes the memory read which will make the i-cache impact smaller (changing the memory read for a load immediate removes 3-4 bytes per site on x86_32 (depending on mov prefixes), or 7-8 bytes on x86_64, it also saves the d-cache hit). About the performance impact of tracepoints (which is comparable to markers), even without immediate values optimizations, tests done by Hideo Aoki on ia64 show no regression. His test case was using hackbench on a kernel where scheduler instrumentation (about 5 events in code scheduler code) was added. Quoting Hideo Aoki about Markers : I evaluated overhead of kernel marker using linux-2.6-sched-fixes git tree, which includes several markers for LTTng, using an ia64 server. While the immediate trace mark feature isn't implemented on ia64, there is no major performance regression. So, I think that we don't have any issues to propose merging marker point patches into Linus's tree from the viewpoint of performance impact. I prepared two kernels to evaluate. The first one was compiled without CONFIG_MARKERS. The second one was enabled CONFIG_MARKERS. I downloaded the original hackbench from the following URL: http://devresources.linux-foundation.org/craiger/hackbench/src/hackbench.c I ran hackbench 5 times in each condition and calculated the average and difference between the kernels. The parameter of hackbench: every 50 from 50 to 800 The number of CPUs of the server: 2, 4, and 8 Below is the results. As you can see, major performance regression wasn't found in any case. Even if number of processes increases, differences between marker-enabled kernel and marker- disabled kernel doesn't increase. Moreover, if number of CPUs increases, the differences doesn't increase either. Curiously, marker-enabled kernel is better than marker-disabled kernel in more than half cases, although I guess it comes from the difference of memory access pattern. * 2 CPUs Number of | without | with | diff | diff | processes | Marker [Sec] | Marker [Sec] | [Sec] | [%] | -------------------------------------------------------------- 50 | 4.811 | 4.872 | +0.061 | +1.27 | 100 | 9.854 | 10.309 | +0.454 | +4.61 | 150 | 15.602 | 15.040 | -0.562 | -3.6 | 200 | 20.489 | 20.380 | -0.109 | -0.53 | 250 | 25.798 | 25.652 | -0.146 | -0.56 | 300 | 31.260 | 30.797 | -0.463 | -1.48 | 350 | 36.121 | 35.770 | -0.351 | -0.97 | 400 | 42.288 | 42.102 | -0.186 | -0.44 | 450 | 47.778 | 47.253 | -0.526 | -1.1 | 500 | 51.953 | 52.278 | +0.325 | +0.63 | 550 | 58.401 | 57.700 | -0.701 | -1.2 | 600 | 63.334 | 63.222 | -0.112 | -0.18 | 650 | 68.816 | 68.511 | -0.306 | -0.44 | 700 | 74.667 | 74.088 | -0.579 | -0.78 | 750 | 78.612 | 79.582 | +0.970 | +1.23 | 800 | 85.431 | 85.263 | -0.168 | -0.2 | -------------------------------------------------------------- * 4 CPUs Number of | without | with | diff | diff | processes | Marker [Sec] | Marker [Sec] | [Sec] | [%] | -------------------------------------------------------------- 50 | 2.586 | 2.584 | -0.003 | -0.1 | 100 | 5.254 | 5.283 | +0.030 | +0.56 | 150 | 8.012 | 8.074 | +0.061 | +0.76 | 200 | 11.172 | 11.000 | -0.172 | -1.54 | 250 | 13.917 | 14.036 | +0.119 | +0.86 | 300 | 16.905 | 16.543 | -0.362 | -2.14 | 350 | 19.901 | 20.036 | +0.135 | +0.68 | 400 | 22.908 | 23.094 | +0.186 | +0.81 | 450 | 26.273 | 26.101 | -0.172 | -0.66 | 500 | 29.554 | 29.092 | -0.461 | -1.56 | 550 | 32.377 | 32.274 | -0.103 | -0.32 | 600 | 35.855 | 35.322 | -0.533 | -1.49 | 650 | 39.192 | 38.388 | -0.804 | -2.05 | 700 | 41.744 | 41.719 | -0.025 | -0.06 | 750 | 45.016 | 44.496 | -0.520 | -1.16 | 800 | 48.212 | 47.603 | -0.609 | -1.26 | -------------------------------------------------------------- * 8 CPUs Number of | without | with | diff | diff | processes | Marker [Sec] | Marker [Sec] | [Sec] | [%] | -------------------------------------------------------------- 50 | 2.094 | 2.072 | -0.022 | -1.07 | 100 | 4.162 | 4.273 | +0.111 | +2.66 | 150 | 6.485 | 6.540 | +0.055 | +0.84 | 200 | 8.556 | 8.478 | -0.078 | -0.91 | 250 | 10.458 | 10.258 | -0.200 | -1.91 | 300 | 12.425 | 12.750 | +0.325 | +2.62 | 350 | 14.807 | 14.839 | +0.032 | +0.22 | 400 | 16.801 | 16.959 | +0.158 | +0.94 | 450 | 19.478 | 19.009 | -0.470 | -2.41 | 500 | 21.296 | 21.504 | +0.208 | +0.98 | 550 | 23.842 | 23.979 | +0.137 | +0.57 | 600 | 26.309 | 26.111 | -0.198 | -0.75 | 650 | 28.705 | 28.446 | -0.259 | -0.9 | 700 | 31.233 | 31.394 | +0.161 | +0.52 | 750 | 34.064 | 33.720 | -0.344 | -1.01 | 800 | 36.320 | 36.114 | -0.206 | -0.57 | -------------------------------------------------------------- Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Acked-by: Masami Hiramatsu <mhiramat@redhat.com> Acked-by: 'Peter Zijlstra' <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13Merge phase #5 (misc) of ↵Linus Torvalds22-148/+92
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip Merges oprofile, timers/hpet, x86/traps, x86/time, and x86/core misc items. * 'x86-core-v4-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (132 commits) x86: change early_ioremap to use slots instead of nesting x86: adjust dependencies for CONFIG_X86_CMOV dumpstack: x86: various small unification steps, fix x86: remove additional_cpus x86: remove additional_cpus configurability x86: improve UP kernel when CPU-hotplug and SMP is enabled dumpstack: x86: various small unification steps dumpstack: i386: make kstack= an early boot-param and add oops=panic dumpstack: x86: use log_lvl and unify trace formatting dumptrace: x86: consistently include loglevel, print stack switch dumpstack: x86: add "end" parameter to valid_stack_ptr and print_context_stack dumpstack: x86: make printk_address equal dumpstack: x86: move die_nmi to dumpstack_32.c traps: x86: finalize unification of traps.c traps: x86: make traps_32.c and traps_64.c equal traps: x86: various noop-changes preparing for unification of traps_xx.c traps: x86_64: use task_pid_nr(tsk) instead of tsk->pid in do_general_protection traps: i386: expand clear_mem_error and remove from mach_traps.h traps: x86_64: make io_check_error equal to the one on i386 traps: i386: use preempt_conditional_sti/cli in do_int3 ...
2008-10-13tty: some ICANON magic is in the wrong placesAlan Cox1-1/+1
Move the set up on ldisc change into the ldisc Move the INQ/OUTQ cases into the driver not in shared ioctl code where it gives bogus answers for other ldisc values Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-13Add an instance parameter devpts interfacesSukadev Bhattiprolu2-11/+23
Pass-in 'inode' or 'tty' parameter to devpts interfaces. With multiple devpts instances, these parameters will be used in subsequent patches to identify the instance of devpts mounted. The parameters also help simplify devpts implementation. Changelog[v3]: - minor changes due to merge with ttydev updates - rename parameters to emphasize they are ptmx or pts inodes - pass-in tty_struct * to devpts_pty_kill() (this will help cleanup the get_node() call in a subsequent patch) Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-13tty: extract the pty init time special casesAlan Cox1-0/+5
The majority of the remaining init_dev code is pty special cases. We refactor this code into the driver->install method. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-13tty: Finish fixing up the init_dev interface to use ERR_PTRAlan Cox1-2/+2
Original suggestion and proposal from Sukadev Bhattiprolu. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-13tty: More driver operationsAlan Cox1-0/+16
We have the lookup operation abstracted which is nice for pty cleanup but we really want to abstract the add/remove entries as well so that we can pull the pty code out of the tty core and create a clear defined interface for the tty driver table. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-13tty: kref the tty driver objectAlan Cox1-4/+11
Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-13tty: Clean up the tty_init_dev changes furtherAlan Cox1-0/+9
Fix up the naming, style and extract some bits of code into the driver specific code Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-13tty: Remove more special casing and out of place codeAlan Cox2-1/+7
Carry on pushing code out of tty_io when it belongs to other drivers. I'm not 100% happy with some of this and it will be worth revisiting some of the exports later when the restructuring work is done. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-13tty: shutdown methodAlan Cox2-1/+8
Right now there are various drivers that try to use tty->count to know when they get the final close. Aristeau Rozanski showed while debugging the vt sysfs race that this isn't entirely safe. Instead of driver side tricks to work around this introduce a shutdown which is called when the tty is being destructed. This also means that the shutdown method is tied into the refcounting. Use this to rework the console close/sysfs logic. Remove lots of special case code from the tty core code. The pty code can now have a shutdown() method that replaces the special case hackery in the tree free up paths. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-13tty: the vhangup syscall is racyAlan Cox1-0/+1
We now have the infrastructure to sort this out but rather than teaching the syscall tty lock rules we move the hard work into a tty helper Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-13tty: usb-serial krefsAlan Cox1-0/+3
Use kref in the USB serial drivers so that we don't free tty structures from under the URB receive handlers as has historically been the case if you were unlucky. This also gives us a framework for general tty drivers to use tty_port objects and refcount. Contains two err->dev_err changes merged together to fix clashes in the -next tree. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-13tty: Add termioxAlan Cox4-0/+29
We need a way to describe the various additional modes and flow control features that random weird hardware shows up and software such as wine wants to emulate as Windows supports them. TCGETX/TCSETX and the termiox ioctl are a SYS5 extension that we might as well adopt. This patches adds the structures and the basic ioctl interfaces when the TCGETX etc defines are added for an architecture. Drivers wishing to use this stuff need to add new methods. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-13tty: Cris has a nice RS485 ioctl so we should steal itAlan Cox2-0/+18
JP Tosoni observed: "About a RS485 ioctl: could you consider the attached files which are already in the Linux kernel (in include/asm-cris). They define a TIOCSERSETRS485 (ioctl.h), and the data structure (rs485.h) with allows to specify timings. Sounds just like what we want ?" and he's right: sort of. Rework the structure to use flag bits and make the time delay a fixed sized field so we don't get 32/64bit problems. Add the ioctls to x86 so that people know what to add to their platform of choice. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-13tty: Add a kref countAlan Cox1-0/+18
Introduce a kref to the tty structure and use it to protect the tty->signal tty references. For now we don't introduce it for anything else. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-13pps: Reserve a line discipline number for PPSAlan Cox1-1/+2
Add a new line discipline for "pulse per second" devices connected to a serial port. Signed-off-by: Rodolfo Giometti <giometti@linux.it> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-13tty: split the buffering from tty_ioAlan Cox1-0/+3
The two are basically independent chunks of code so lets split them up for readability and sanity. It also makes the API boundaries much clearer. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-13serial: Make uart_port's ioport "unsigned long".David Miller1-1/+1
Otherwise the top 32-bits of the resource value get chopped off on 64-bit systems, and the resulting I/O accesses go to random places. Thanks to testing and debugging by Josip Rodin, which helped track this down. Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-13Merge branches 'oprofile-v2' and 'timers/hpet' into x86/core-v4Ingo Molnar2-11/+5
2008-10-13Merge branch 'linus' into oprofile-v2Ingo Molnar4128-376906/+14386
Conflicts: arch/x86/kernel/apic_32.c arch/x86/oprofile/nmi_int.c include/linux/pci_ids.h
2008-10-13x86: change early_ioremap to use slots instead of nestingYinghai Lu2-4/+4
so we could remove the requirement that one needs to call early_iounmap() in exactly reverse order of early_ioremap(). Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13traps: x86: various noop-changes preparing for unification of traps_xx.cAlexander van Heukelum1-4/+0
- reordering include files - whitespace changes - comment changes - removed unused bad_intr() - make default_do_nmi static Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13traps: i386: expand clear_mem_error and remove from mach_traps.hAlexander van Heukelum1-6/+0
This is the last user of clear_mem_error, which is defined only on i386. Expand the inline function and remove it from include/asm-x86/mach-default/mach_traps.h Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13traps: x86: converge trap_init functionsAlexander van Heukelum2-9/+11
- set_system_gate on i386 is really set_system_trap_gate - set_system_gate on x86_64 is really set_system_intr_gate - ist=0 means no special stack switch is done: - introduce STACKFAULT_STACK, DOUBLEFAULT_STACK, NMI_STACK, DEBUG_STACK and MCE_STACK as on x86_64. - use the _ist variants with XXX_STACK set to zero - remove set_system_gate Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm> Signed-off-by: Ingo Molnar <mingo@elte.hu> traps: x86: correct copy/paste bug: a trap is a GATE_TRAP Fix copy/paste/forgot-to-edit bug in desc.h. Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13x86, traps: converge do_debug handlersAlexander van Heukelum1-4/+0
Make the x86_64-version and the i386-version of do_debug more similar. - introduce preempt_conditional_sti/cli to i386. The preempt-count is now elevated during the trap handler, like on x86_64. It does not run on a separate stack, however. - replace an open-coded "send_sigtrap" - copy some comments Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13x86, traps: introduce dotraplinkageAlexander van Heukelum1-37/+36
Mark the exception handlers with "dotraplinkage" to hide the calling convention differences between i386 and x86_64. Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13x86, traps: split out math_error and simd_math_errorAlexander van Heukelum1-3/+3
Split out math_error from do_coprocessor_error and simd_math_error from do_simd_coprocessor_error, like on i386. While at it, add the "error_code" parameter to do_coprocessor_error, do_simd_coprocessor_error and do_spurious_interrupt_bug. This does not change the generated code, but brings the declarations in line with all the other trap handlers. Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13x86: fix virt_addr_valid() with CONFIG_DEBUG_VIRTUAL=y, v2Vegard Nossum2-3/+9
virt_addr_valid() calls __pa(), which calls __phys_addr(). With CONFIG_DEBUG_VIRTUAL=y, __phys_addr() will kill the kernel if the address *isn't* valid. That's clearly wrong for virt_addr_valid(). We also incorporate the debugging checks into virt_addr_valid(). Signed-off-by: Vegard Nossum <vegardno@ben.ifi.uio.no> Acked-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13x86: __show_registers() and __show_regs() API unificationPekka Enberg1-2/+1
Currently the low-level function to dump user-passed registers on i386 is called __show_registers() whereas on x86-64 it's called __show_regs(). Unify the API to simplify porting of kmemcheck to x86-64. Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Acked-by: Vegard Nossum <vegard.nossum@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13x86: move prefill_possible_map calling early, fix, V2Chuck Ebbert1-5/+3
Commit 4a701737 ("x86: move prefill_possible_map calling early, fix") is the wrong fix: prefill_possible_map() needs to be available even when CONFIG_HOTPLUG_CPU is not set. A followon patch will do that. Fix this correctly by making prefill_possible_map() available even when CONFIG_HOTPLUG_CPU is not set. The function is needed so that the number of possible CPUs can be determined. Tested on uniprocessor machine with CPU hotplug disabled. From boot log: Before: NR_CPUS: 512, nr_cpu_ids: 512, nr_node_ids 1 After: NR_CPUS: 512, nr_cpu_ids: 1, nr_node_ids 1 Signed-off-by: Chuck Ebbert <cebbert@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13x86: merge winchip-2 and winchip-2a cpu choicesKrzysztof Helt1-2/+0
The Winchip-2 and Winchip-2A cpu choices select the same options for kernel and compiler. Merge them to save few bytes and reduce confusion. Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl> Acked-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13traps: x86: remove trace_hardirqs_fixup from pagefault handlerAlexander van Heukelum1-21/+0
The last use of trace_hardirqs_fixup is unnecessary, because the trap is taken with interrupt off on i386 as well as x86_64, and the irq-tracer is notified of this from the assembly code. trace_hardirqs_fixup and trace_hardirqs_fixup_flags are removed from include/asm-x86/irqflags.h as they are no longer used. Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13x86: remove SEGMENT_IS_FLAT_CODEGlauber Costa1-3/+0
There are no users in the kernel. Signed-off-by: Glauber Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13x86: use user_mode macroGlauber Costa1-3/+0
Instead of using SEGMENT_IS_KERNEL_CODE, use the "user_mode" macro, which can play the same role. Delete the former, since it now lacks any user. Signed-off-by: Glauber Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13x86: make mm/gup.c more virtualization friendlyJan Beulich1-1/+1
Since pte_flags() is much cheaper than pte_val() in some virtualized environments (namely, Xen), use the former whereever possible. Signed-off-by: Jan Beulich <jbeulich@novell.com> Cc: "Nick Piggin" <npiggin@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13x86: add memory clobber in switch_to()Vegard Nossum1-1/+4
Segment registers are reloaded, so we should add a memory clobber. The generated assembly code is identical in my tests, but this doesn't mean it is necessarily true for all configurations/compilers. x86_64 already has the memory clobber. Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13x86: check dsdt before find oem table for es7000, v2Yinghai Lu1-0/+1
v2: use __acpi_unmap_table() Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13x86: add early_memremap()Jeremy Fitzhardinge1-0/+1
early_ioremap() is also used to map normal memory when constructing the linear memory mapping. However, since we sometimes need to be able to distinguish between actual IO mappings and normal memory mappings, add a early_memremap() call, which maps with PAGE_KERNEL (as opposed to PAGE_KERNEL_IO for early_ioremap()), and use it when constructing pagetables. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13x86: remove duplicate early_ioremap declarationsJeremy Fitzhardinge2-17/+0
early_ioremap() is redeclared in several places; remove them. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13x86: add _PAGE_IOMAP pte flag for IO mappingsJeremy Fitzhardinge1-2/+12
Use one of the software-defined PTE bits to indicate that a mapping is intended for an IO address. On native hardware this is irrelevent, since a physical address is a physical address. But in a virtual environment, physical addresses are also virtualized, so there needs to be some way to distinguish between pseudo-physical addresses and actual hardware addresses; _PAGE_IOMAP indicates this intent. By default, __supported_pte_mask masks out _PAGE_IOMAP, so it doesn't even appear in the final pagetable. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13i386: remove kprobes' restore_interrupts in favour of conditional_stiAlexander van Heukelum1-9/+0
x86_64 uses a helper function conditional_sti in traps_64.c which is equal to restore_interrupts in kprobes.h. The only user of restore_interrupts is in traps_32.c. Introduce conditional_sti for i386 and remove restore_interrupts. Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13x86-64: reduce boot fixmap spaceJan Beulich1-4/+4
Just like for 32-bit - as 256 entries are needed, aligning to a 256-entry boundary is sufficient and still guarantees the single pte table requirement. Likewise move up __end_of_permanent_fixed_addresses, to match 32-bit. Signed-off-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-12Merge branch 'for_linus' of ↵Linus Torvalds1-1/+4
git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: ext4: fix kconfig typo and extra whitespace ext4: fix build failure without procfs ext4: add an option to control error handling on file data jbd2: don't dirty original metadata buffer on abort ext4: add checks for errors from jbd2 jbd2: fix error handling for checkpoint io jbd2: abort when failed to log metadata buffers
2008-10-12Merge branch 'x86-core-v2-for-linus' of ↵Linus Torvalds25-172/+395
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip This merges in: x86/build, x86/microcode, x86/spinlocks, x86/memory-corruption-check, x86/early-printk, x86/xsave, x86/quirks, x86/setup, x86/signal, core/signal, x86/urgent, x86/xen * 'x86-core-v2-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (142 commits) x86: make processor type select depend on CONFIG_EMBEDDED x86: extend processor type select help text x86, amd-iommu: propagate PCI device enabling error warnings: fix arch/x86/kernel/io_apic_64.c warnings: fix arch/x86/kernel/early_printk.c x86, fpu: check __clear_user() return value x86: memory corruption check - cleanup x86: ioperm user_regset xen: do not reserve 2 pages of padding between hypervisor and fixmap. xen: use spin_lock_nest_lock when pinning a pagetable x86: xsave: set FP, SSE bits in the xsave header in the user sigcontext x86: xsave: fix error condition in save_i387_xstate() x86: SB450: deprioritize DMI quirks x86: SB450: skip IRQ0 override if it is not routed to INT2 of IOAPIC x86: replace a magic number with a named constant in the VESA boot code x86 setup: remove IMAGE_OFFSET x86 setup: remove DEF_INITSEG and DEF_SETUPSEG Revert "x86: fix ghost EDD devices in /sys again" x86 setup: fix ghost entries under /sys/firmware/edd take 3 x86: signal: remove indent in restore_sigcontext() ...
2008-10-12Merge branch 'for-linus' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc: (24 commits) MMC: Use timeout values from CSR MMC: CSD and CID timeout values sdhci: 'scratch' may be used uninitialized mmc: explicitly mention SDIO support in Kconfig mmc: remove redundant "depends on" Fix comment in include/linux/mmc/host.h sdio: high-speed support mmc_block: hard code 512 byte block size sdhci: force high speed capability on some controllers mmc_block: filter out PC requests mmc_block: indicate strict ordering mmc_block: inform block layer about sector count restriction sdio: give sdio irq thread a host specific name sdio: make sleep on error interruptable sdhci: reduce card detection delay sdhci: let the controller wait for busy state to end atmel-mci: Add missing flush_dcache_page() in PIO transfer code atmel-mci: Don't overwrite error bits when NOTBUSY is set atmel-mci: Add experimental DMA support atmel-mci: support multiple mmc slots ...
2008-10-12add key_revoke() dummy for KEYS=nAdrian Bunk1-0/+1
This fixes the following build error with CONFIG_KEYS=n, caused by commit dfd15c46a6c2cafb006183c0c14f07e59eee4ac0 ("cifs: explicitly revoke SPNEGO key after session setup"): CC [M] fs/cifs/sess.o fs/cifs/sess.c: In function 'CIFS_SessSetup': fs/cifs/sess.c:628: error: implicit declaration of function 'key_revoke' make[3]: *** [fs/cifs/sess.o] Error 1 Signed-off-by: Adrian Bunk <bunk@kernel.org> Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-12Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next-2.6Linus Torvalds3-25/+27
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next-2.6: (180 commits) leo: disable cursor when leaving graphics mode cg6: disable cursor when leaving graphics mode sparc32: sun4m interrupt mask cleanup drivers/rtc/Kconfig: don't build rtc-cmos.o on sparc32 sparc: arch/sparc/kernel/pmc.c -- extra #include? sparc32: Add more extensive documentation of sun4m interrupts. sparc32: Kill irq_rcvreg from sun4m_irq.c sparc32: Delete master_l10_limit. sparc32: Use PROM device probing for sun4c timers. sparc32: Use PROM device probing for sun4c interrupt register. sparc32: Delete claim_ticker14(). sparc32: Stop calling claim_ticker14() from sun4c_irq.c sparc32: Kill clear_profile_irq btfixup entry. sparc32: Call sun4m_clear_profile_irq() directly from sun4m_smp.c sparc32: Remove #if 0'd code from sun4c_irq.c sparc32: Remove some SMP ifdefs in sun4d_irq.c sparc32: Use PROM infrastructure for probing and mapping sun4d timers. sparc32: Use PROM device probing for sun4m irq registers. sparc32: Use PROM device probing for sun4m timer registers. sparc: Fix user_regset 'n' field values. ...
2008-10-12Merge branches 'x86/xen', 'x86/build', 'x86/microcode', 'x86/mm-debug-v2', ↵Ingo Molnar25-172/+395
'x86/memory-corruption-check', 'x86/early-printk', 'x86/xsave', 'x86/ptrace-v2', 'x86/quirks', 'x86/setup', 'x86/spinlocks' and 'x86/signal' into x86/core-v2
2008-10-12x86: memory corruption check - cleanupIngo Molnar2-17/+17
Move the prototypes from the generic kernel.h header to the more appropriate include/asm-x86/bios_ebda.h header file. Also, remove the check from the power management code - this is a pure x86 matter for now. Signed-off-by: Ingo Molnar <mingo@elte.hu>
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