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* [PATCH] i386: Don't discard upper 32bits of HWCR on K8Andi Kleen2005-10-10
| | | | | | | | | | | Need to use long long, not long when RMWing a MSR. I think it's harmless right now, but still should be better fixed if AMD adds any bits in the upper 32bit of HWCR. Bug was introduced with the TLB flush filter fix for i386 Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] i386: fix stack alignment for signal handlersMarkus F.X.J. Oberhumer2005-10-10
| | | | | | | | | | | | | This fixes the setup of the alignment of the signal frame, so that all signal handlers are run with a properly aligned stack frame. The current code "over-aligns" the stack pointer so that the stack frame is effectively always mis-aligned by 4 bytes. But what we really want is that on function entry ((sp + 4) & 15) == 0, which matches what would happen if the stack were aligned before a "call" instruction. Signed-off-by: Markus F.X.J. Oberhumer <markus@oberhumer.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] gfp flags annotations - part 1Al Viro2005-10-08
| | | | | | | | | | | | - added typedef unsigned int __nocast gfp_t; - replaced __nocast uses for gfp flags with gfp_t - it gives exactly the same warnings as far as sparse is concerned, doesn't change generated code (from gcc point of view we replaced unsigned int with typedef) and documents what's going on far better. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] i386: include linux/irq.h rather than asm/hw_irq.hNick Piggin2005-09-30
| | | | | | | | | | | | I need the following patch to compile -git8 here, otherwise these files fail to compile (asm/hw_irq.h needs definitions from linux/irq.h and that file provides the required include ordering). I did not do a full audit, though there looks to be many other places that should get the same treatment, if this is the right way to do it. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Fix up TLB flush filter disablingAndi Kleen2005-09-29
| | | | | | | | I checked with AMD and they requested to only disable it for family 15. Also disable it for i386 too. And some style fixes. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] useless includes of linux/irq.h in arch/i386Al Viro2005-09-26
| | | | | | | | | | Most of these guys are simply not needed (pulled by other stuff via asm-i386/hardirq.h). One that is not entirely useless is hilarious - arch/i386/oprofile/nmi_timer_int.c includes linux/irq.h... as a way to get linux/errno.h Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* Partially revert "Fix time going twice as fast problem on ATI Xpress chipsets"Linus Torvalds2005-09-14
| | | | | | | | | | | | | | | | | | | Commit 66759a01adbfe8828dd063e32cf5ed3f46696181 introduced the fix for time ticking too fast on some boards by disabling one of the doubly connected timer pins on ATI boards. However, it ends up being _much_ too broad a brush, and that just makes some other ATI boards not work at all since they now have no timer source. So disable the automatic ATI southbridge detection, and just rely on people who see this problem disabling it by hand with the option "disable_timer_pin_1" on the kernel command line. Maybe somebody can figure out the proper tests at a later date. Acked-by: Peter Osterlund <petero2@telia.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Even more fallout from ATI Xpress timer workaroundCal Peake2005-09-13
| | | | | | | disable_timer_pin_1 needs IO-APIC, not just local APIC. Signed-off-by: Cal Peake <cp@absolutedigital.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] i386: Ignore masked FPU exceptionsChuck Ebbert2005-09-13
| | | | | | | | | | | | | | | Masked FPU exceptions should obviously not happen in the first place, but if they do, ignoring them seems to be the right thing to do. Although there is no documentation available for Cyrix MII, I did find erratum F-7 for Winchip C6, "FPU instruction may result in spurious exception under certain conditions" which seems to indicate that this can happen. That would also explain the behaviour Ondrej Zary reported on the MII. Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] arch/i386: Replace custom macro with isdigit()Tobias Klauser2005-09-13
| | | | | | | | Replace the custom is_digit() macro with isdigit() from <linux/ctype.h> Signed-off-by: Tobias Klauser <tklauser@nuerscht.ch> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] use add_taint() for setting tainted bit flagsRandy Dunlap2005-09-13
| | | | | | | | | Use the add_taint() interface for setting tainted bit flags instead of doing it manually. Signed-off-by: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* Fix fallout from ATI Xpress timer workaroundLinus Torvalds2005-09-12
| | | | | | | | | ACPI earlyquirks needs to honor the proper config variables, and include the right header file. (Fixes commit 66759a01adbfe8828dd063e32cf5ed3f46696181) Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] x86-64: i386/x86-64: Fix time going twice as fast problem on ATI ↵Chuck Ebbert2005-09-12
| | | | | | | | | | | Xpress chipsets Original patch from Bertro Simul This is probably still not quite correct, but seems to be the best solution so far. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] x86-64: Use ACPI PXM to parse PCI<->node assignmentsAndi Kleen2005-09-12
| | | | | | | Since this is shared code I had to implement it for i386 too Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] i386: Don't miss pending signals returning to user mode after signal ↵Roland McGrath2005-09-12
| | | | | | | | | processing Signed-off-by: Roland McGrath <roland@redhat.com> Acked-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] i386 / uml: add dwarf sections to static link scriptPaolo 'Blaisorblade' Giarrusso2005-09-10
| | | | | | | | | | | | | | | | | | | | | | | Inside the linker script, insert the code for DWARF debug info sections. This may help GDB'ing a Uml binary. Actually, it seems that ld is able to guess what I added correctly, but normal linker scripts include this section so it should be correct anyway adding it. On request by Sam Ravnborg <sam@ravnborg.org>, I've added it to asm-generic/vmlinux.lds.s. I've also moved there the stabs debug section, used the new macro in i386 linker script and added DWARF debug section to that. In the truth, I've not been able to verify the difference in GDB behaviour after this change (I've seen large improvements with another patch). This may depend on my binutils version, older one may have worse defaults. However, this section is present in normal linker script, so add it at least for the sake of cleanness. Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Acked-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] i386: fix-up schedule_timeout() usageNishanth Aravamudan2005-09-10
| | | | | | | | | Use schedule_timeout_interruptible() instead of set_current_state()/schedule_timeout() to reduce kernel size. Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] i386/x86_64: make get_cpu_vendor() staticAdrian Bunk2005-09-10
| | | | | | | | get_cpu_vendor() no longer has any users in other files. Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] remove ACPI S4bios supportPavel Machek2005-09-10
| | | | | | | | | | | | Remove S4BIOS support. It is pretty useless, and only ever worked for _me_ once. (I do not think anyone else ever tried it). It was in feature-removal for a long time, and it should have been removed before. Signed-off-by: Pavel Machek <pavel@suse.cz> Signed-off-by: Adrian Bunk <bunk@stusta.de> Cc: "Brown, Len" <len.brown@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] i386/smpboot: use msleep() instead of schedule_timeout()Nishanth Aravamudan2005-09-10
| | | | | | | | | | Replace schedule_timeout() with msleep() to guarantee the task delays as expected. Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Signed-off-by: Domen Puncer <domen@coderock.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* Merge master.kernel.org:/pub/scm/linux/kernel/git/sam/kbuild Linus Torvalds2005-09-09
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| * kbuild: full dependency check on asm-offsets.hSam Ravnborg2005-09-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Building asm-offsets.h has been moved to a seperate Kbuild file located in the top-level directory. This allow us to share the functionality across the architectures. The old rules in architecture specific Makefiles will die in subsequent patches. Furhtermore the usual kbuild dependency tracking is now used when deciding to rebuild asm-offsets.s. So we no longer risk to fail a rebuild caused by asm-offsets.c dependencies being touched. With this common rule-set we now force the same name across all architectures. Following patches will fix the rest. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* | [PATCH] Update PCI IOMEM allocation startDaniel Ritz2005-09-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This fixes the problem with "Averatec 6240 pcmcia_socket0: unable to apply power", which was due to the CardBus IOMEM register region being allocated at an address that was actually inside the RAM window that had been reserved for video frame-buffers in an UMA setup. The BIOS _should_ have marked that region reserved in the e820 memory descriptor tables, but did not. It is fixed by rounding up the default starting address of PCI memory allocations, so that we leave a bigger gap after the final known memory location. The amount of rounding depends on how big the unused memory gap is that we can allocate IOMEM from. Based on example code by Linus. Acked-by: Greg KH <greg@kroah.com> Acked-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | [PATCH] timer initialization cleanup: DEFINE_TIMERIngo Molnar2005-09-09
| | | | | | | | | | | | | | | | | | | | Clean up timer initialization by introducing DEFINE_TIMER a'la DEFINE_SPINLOCK. Build and boot-tested on x86. A similar patch has been been in the -RT tree for some time. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | [PATCH] fbdev: Resurrect hooks to get EDID from firmwareAntonino A. Daplas2005-09-09
| | | | | | | | | | | | | | | | | | | | | | | | | | For the i386, code is already present in video.S that gets the EDID from the video BIOS. Make this visible so drivers can also use this data as fallback when i2c does not work. To ensure that the EDID block is returned for the primary graphics adapter only, by check if the IORESOURCE_ROM_SHADOW flag is set. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | [PATCH] i386: seccomp fix for auditing/ptraceAndrea Arcangeli2005-09-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is the same issue as ppc64 before, when returning to userland we shouldn't re-compute the seccomp check or the task could be killed during sigreturn when orig_eax is overwritten by the sigreturn syscall. This was found by Roland. This was harmless from a security standpoint, but some i686 users reported failures with auditing enabled system wide (some distro surprisingly makes it the default) and I reproduced it too by keeping the whole workload under strace -f. Patch is tested and works for me under strace -f. nobody@athlon:~/cpushare> strace -o /tmp/o -f python seccomp_test.py make: Nothing to be done for `seccomp_test'. Starting computing some malicious bytecode init load start stop receive_data failure kill exit_code 0 signal 9 The malicious bytecode has been killed successfully by seccomp Starting computing some safe bytecode init load start stop 174 counts kill exit_code 0 signal 0 The seccomp_test.py completed successfully, thank you for testing. (akpm: collaterally cleaned up a bit of do_syscall_trace() too) Signed-off-by: Andrea Arcangeli <andrea@cpushare.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | [PATCH] x86: MP_processor_info fixAndrew Morton2005-09-09
| | | | | | | | | | | | | | | | | | | | | | Remove the weird and apparently unnecessary logic in MP_processor_info() which assumes that the BSP is the first one to run MP_processor_info(). On one of my boxes that isn't true and cpu_possible_map gets the wrong value. Cc: Zwane Mwaikambo <zwane@arm.linux.org.uk> Cc: Alexander Nyberg <alexn@telia.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | [PATCH] Fix misspelled i8259 typo in io_apic.cKarsten Wiese2005-09-09
| | | | | | | | | | | | | | | | The legacy PIC's name is "i8259". Signed-off-by: Karsten Wiese <annabellesgarden@yahoo.de> Signed-off-by: Vojtech Pavlik <vojtech@suse.cz> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | [PATCH] __user annotations for pointers in i386 sigframeviro@ZenIV.linux.org.uk2005-09-09
| | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq Linus Torvalds2005-09-08
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| * [CPUFREQ] Remove trailing whitespace before \n's in printks.Dave Jones2005-09-01
| | | | | | | | | | From: Denis Vlasenko <vda@ilport.com.ua> Signed-off-by: Dave Jones <davej@redhat.com>
| * [CPUFREQ] Remove extra arg from dprintk in cpufreq/speedstep-smi.cMika Kukkonen2005-09-01
| | | | | | | | | | | | | | | | | | | | Minor fallout from my upcoming __attribute__((format(printf,x,y))) patches. The variable 'result' is untouched, so this patch just removes it. Signed-off-by: Mika Kukkonen <mikukkon@gmail.com> Signed-off-by: Dave Jones <davej@redhat.com>
| * [CPUFREQ] dprintf format fixes in cpufreq/speedstep-centrino.cMika Kukkonen2005-09-01
| | | | | | | | | | | | | | | | | | Ho-hum, did not notice there was more printf fixes for cpufreq (you should see the amount I have for isdn and reiser ...). Sorry for noise. Signed-off-by: Mika Kukkonen <mikukkon@gmail.com> Signed-off-by: Dave Jones <davej@redhat.com>
| * [CPUFREQ] speedstep-centrino: skip extract_clock logic for acpi based centrinoVenkatesh Pallipadi2005-09-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | speedstep_centrino.c:extract_clock() assumes the bus speed of 100MHz, which is not true with latest laptops. Due to this assumption and due to the encoded frequency check during initialization, speedstep-centrino driver fails even on systems that has proper ACPI information to do the P-state transition. The change below moves the centrino-speedstep detection to be used only when table based P-state transition is done. For ACPI based P-state transition, we skip the centrino_cpu identification, and as a result we don't use the bus speed assumption in extract_clock. This change makes speedstep-centrino work on Pentium-M based systems, which have more than 100MHz bus speed. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
* | Merge linux-2.6 with linux-acpi-2.6Len Brown2005-09-08
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| * | [PATCH] kprobes: fix bug when probed on task and isr functionsKeshavamurthy Anil S2005-09-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch fixes a race condition where in system used to hang or sometime crash within minutes when kprobes are inserted on ISR routine and a task routine. The fix has been stress tested on i386, ia64, pp64 and on x86_64. To reproduce the problem insert kprobes on schedule() and do_IRQ() functions and you should see hang or system crash. Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Acked-by: Prasanna S Panchamukhi <prasanna@in.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * | [PATCH] kprobes: fix handling of simultaneous probe hit/unregisterJim Keniston2005-09-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch fixes a bug in kprobes's handling of a corner case on i386 and x86_64. On an SMP system, if one CPU unregisters a kprobe just after another CPU hits that probepoint, kprobe_handler() on the latter CPU sees that the kprobe has been unregistered, and attempts to let the CPU continue as if the probepoint hadn't been hit. The bug is that on i386 and x86_64, we were neglecting to set the IP back to the beginning of the probed instruction. This could cause an oops or crash. This bug doesn't exist on ppc64 and ia64, where a breakpoint instruction leaves the IP pointing to the beginning of the instruction. I don't know about sparc64. (Dave, could you please advise?) This fix has been tested on i386 and x86_64 SMP systems. To reproduce the problem, set one CPU to work registering and unregistering a kprobe repeatedly, and another CPU pounding the probepoint in a tight loop. Acked-by: Prasanna S Panchamukhi <prasanna@in.ibm.com> Signed-off-by: Jim Keniston <jkenisto@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * | [PATCH] kprobes: prevent possible race conditions i386 changesPrasanna S Panchamukhi2005-09-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | This patch contains the i386 architecture specific changes to prevent the possible race conditions. Signed-off-by: Prasanna S Panchamukhi <prasanna@in.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * | [PATCH] fix: dmi_check_systemRobert Love2005-09-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Background: 1) dmi_check_system() returns the count of the number of matches. Zero thus means no matches. 2) A match callback can return nonzero to stop the match checking. Bug: The count is incremented after we check for the nonzero return value, so it does not reflect the actual count. We could say this is intended, for some dumb reason, except that it means that a match on the first check returns zero--no matches--if the callback returns nonzero. Attached patch implements the count before calling the callback and thus before potentially short-circuiting. Signed-off-by: Robert Love <rml@novell.com> Cc: Andrey Panin <pazke@donpac.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * | [PATCH] dmi: add onboard devices discoveryAndrey Panin2005-09-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds onboard devices and IPMI BMC discovery into DMI scan code. Drivers can use dmi_find_device() function to search for devices by type and name. Signed-off-by: Andrey Panin <pazke@donpac.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * | [PATCH] dmi: make dmi_string() behave like strdup()Andrey Panin2005-09-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | This patch changes dmi_string() function to allocate string copy by itself, to avoid code duplication in the next patch. Signed-off-by: Andrey Panin <pazke@donpac.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * | [PATCH] dmi: remove old debugging codeAndrey Panin2005-09-07
| | | | | | | | | | | | | | | | | | | | | | | | DMI debugging code is unused for ages. This patch removes it. Signed-off-by: Andrey Panin <pazke@donpac.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * | [PATCH] dmi: remove uneeded functionAndrey Panin2005-09-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | After elimination of central DMI blacklist dmi_scan_machine() function became a wrapper for dmi_iterate(). This patch moves some code around to kill unneeded function. Signed-off-by: Andrey Panin <pazke@donpac.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * | [PATCH] NTP: ntp-helper functionsjohn stultz2005-09-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch cleans up a commonly repeated set of changes to the NTP state variables by adding two helper inline functions: ntp_clear(): Clears the ntp state variables ntp_synced(): Returns 1 if the system is synced with a time server. This was compile tested for alpha, arm, i386, x86-64, ppc64, s390, sparc, sparc64. Signed-off-by: John Stultz <johnstul@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * | [PATCH] Additions to .data.read_mostly sectionRavikiran G Thirumalai2005-09-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Mark variables which are usually accessed for reads with __readmostly. Signed-off-by: Alok N Kataria <alokk@calsoftinc.com> Signed-off-by: Shai Fultheim <shai@scalex86.org> Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * | [PATCH] remove the second arg of do_timer_interrupt()Adrian Bunk2005-09-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The second arg of do_timer_interrupt() is not used in the functions, and all callers pass NULL. Signed-off-by: Adrian Bunk <bunk@stusta.de> Cc: Paul Mundt <lethal@Linux-SH.ORG> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * | [PATCH] NMI: Update NMI users of RCU to use new APIPaul E. McKenney2005-09-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Uses of RCU for dynamically changeable NMI handlers need to use the new rcu_dereference() and rcu_assign_pointer() facilities. This change makes it clear that these uses are safe from a memory-barrier viewpoint, but the main purpose is to document exactly what operations are being protected by RCU. This has been tested on x86 and x86-64, which are the only architectures affected by this change. Signed-off-by: <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * | [PATCH] More __read_mostly variablesChristoph Lameter2005-09-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Move some more frequently read variables that showed up during some of our performance tests as sometimes ending up in hot cachelines to the read_mostly section. Fix: Move the __read_mostly from before hpet_usec_quotient to follow the variable like the other uses of __read_mostly. Signed-off-by: Alok N Kataria <alokk@calsoftinc.com> Signed-off-by: Christoph Lameter <christoph@scalex86.org> Signed-off-by: Shai Fultheim <shai@scalex86.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * | [PATCH] detect soft lockupsIngo Molnar2005-09-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds a new kernel debug feature: CONFIG_DETECT_SOFTLOCKUP. When enabled then per-CPU watchdog threads are started, which try to run once per second. If they get delayed for more than 10 seconds then a callback from the timer interrupt detects this condition and prints out a warning message and a stack dump (once per lockup incident). The feature is otherwise non-intrusive, it doesnt try to unlock the box in any way, it only gets the debug info out, automatically, and on all CPUs affected by the lockup. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Signed-Off-By: Matthias Urlichs <smurf@smurf.noris.de> Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * | [PATCH] x86/x86_64: deferred handling of writes to /proc/irqxx/smp_affinityAshok Raj2005-09-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When handling writes to /proc/irq, current code is re-programming rte entries directly. This is not recommended and could potentially cause chipset's to lockup, or cause missing interrupts. CONFIG_IRQ_BALANCE does this correctly, where it re-programs only when the interrupt is pending. The same needs to be done for /proc/irq handling as well. Otherwise user space irq balancers are really not doing the right thing. - Changed pending_irq_balance_cpumask to pending_irq_migrate_cpumask for lack of a generic name. - added move_irq out of IRQ_BALANCE, and added this same to X86_64 - Added new proc handler for write, so we can do deferred write at irq handling time. - Display of /proc/irq/XX/smp_affinity used to display CPU_MASKALL, instead it now shows only active cpu masks, or exactly what was set. - Provided a common move_irq implementation, instead of duplicating when using generic irq framework. Tested on i386/x86_64 and ia64 with CONFIG_PCI_MSI turned on and off. Tested UP builds as well. MSI testing: tbd: I have cards, need to look for a x-over cable, although I did test an earlier version of this patch. Will test in a couple days. Signed-off-by: Ashok Raj <ashok.raj@intel.com> Acked-by: Zwane Mwaikambo <zwane@holomorphy.com> Grudgingly-acked-by: Andi Kleen <ak@muc.de> Signed-off-by: Coywolf Qi Hunt <coywolf@lovecn.org> Signed-off-by: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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