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2008-12-09[IA64] Clear up section mismatch with arch_unregister_cpu()Robin Holt
The generic_defconfig has three section mismatches. This clears arch_unregister_cpu() Signed-off-by: Robin Holt <holt@sgi.com> Signed-off-by: Jack Steiner <steiner@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-11-20[IA64] ia64/pv_ops/pv_cpu_ops: fix _IA64_REG_IP case.Isaku Yamahata
pv_cpu_ops.getreg(_IA64_REG_IP) returned constant. But the returned ip valued should be the one in the caller, not of the callee. This patch fixes that. Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-11-20[IA64] remove duplicate include iommu.hHuang Weiyi
arch/ia64/kernel/pci-dma.c only needs to include iommu once. Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-11-20[IA64] use mprintk instead of printk, in ia64_mca_modify_original_stackHidetoshi Seto
Using printk from MCA/INIT context is unsafe since it can cause deadlock. The ia64_mca_modify_original_stack is called from both of mca handler and init handler, so it should use mprintk instead of printk. Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-11-20[IA64] Rationalize kernel mode alignment checkingTony Luck
Itanium processors can handle some misaligned data accesses. They also provide a mode where all such accesses are forced to trap. The kernel was schizophrenic about use of this mode: * Base kernel code ran in permissive mode where the only traps generated were from those cases that the h/w could not handle. * Interrupt, syscall and trap code ran in strict mode where all unaligned accesses caused traps to the 0x5a00 unaligned reference vector. Use strict alignment checking throughout the kernel, but make sure that we continue to let user mode use more relaxed mode as the default. Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-11-07[IA64] Reserve elfcorehdr memory in CONFIG_CRASH_DUMPJay Lan
IA64 kdump kernel failed to initialize /proc/vmcore in 2.6.28-rc2. A bug was introduced in this patch commit: d9a9855d0b06ca6d6cc92596fedcc03f8512e062 always reserve elfcore header memory in crash kernel The problem was that the call to reserve_elfcorehdr() should be placed in CONFIG_CRASH_DUMP rather than in CONFIG_CRASH_KERNEL, which does not exist. Signed-off-by: Jay Lan <jlan@sgi.com> Acked-by: Simon Hormon <horms@verge.net.au> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-11-06[IA64] fix boot panic caused by offline CPUsDoug Chapman
This fixes a regression introduced by 2c6e6db41f01b6b4eb98809350827c9678996698 "Minimize per_cpu reservations." That patch incorrectly used information about what CPUs are possible that was not yet initialized by ACPI. The end result was that per_cpu structures for offline CPUs were not initialized causing a NULL pointer reference. Since we cannot do the full acpi_boot_init() call any earlier, the simplest fix is to just parse the MADT for SAPIC entries early to find the CPU info. This should also allow for some cleanup of the code added by the "Minimize per_cpu reservations". This patch just fixes the regressions, the cleanup will come in a later patch. Signed-off-by: Doug Chapman <doug.chapman@hp.com> Signed-off-by: Alex Chiang <achiang@hp.com> CC: Robin Holt <holt@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-11-04[IA64] remove duplicated #include from pci-dma.cHuang Weiyi
Removed duplicated #include <asm/machvec.h> and <linux/string.h> in arch/ia64/kernel/pci-dma.c. Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-11-01saner FASYNC handling on file closeAl Viro
As it is, all instances of ->release() for files that have ->fasync() need to remember to evict file from fasync lists; forgetting that creates a hole and we actually have a bunch that *does* forget. So let's keep our lives simple - let __fput() check FASYNC in file->f_flags and call ->fasync() there if it's been set. And lose that crap in ->release() instances - leaving it there is still valid, but we don't have to bother anymore. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-24x86/PCI: build failure at x86/kernel/pci-dma.c with !CONFIG_PCIFenghua Yu
On Thu, Oct 23, 2008 at 04:09:52PM -0700, Alexander Beregalov wrote: > arch/x86/kernel/built-in.o: In function `iommu_setup': > pci-dma.c:(.init.text+0x36ad): undefined reference to `forbid_dac' > pci-dma.c:(.init.text+0x36cc): undefined reference to `forbid_dac' > pci-dma.c:(.init.text+0x3711): undefined reference to `forbid_dac This patch partially reverts a patch to add IOMMU support to ia64. The forbid_dac variable was incorrectly moved to quirks.c, which isn't built when PCI is disabled. Tested-by: "Alexander Beregalov" <a.beregalov@gmail.com> Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-10-23Merge branch 'release' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6 * 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6: (41 commits) [IA64] Fix annoying IA64_TR_ALLOC_MAX message. [IA64] kill sys32_pipe [IA64] remove sys32_pause [IA64] Add Variable Page Size and IA64 Support in Intel IOMMU ia64/pv_ops: paravirtualized instruction checker. ia64/xen: a recipe for using xen/ia64 with pv_ops. ia64/pv_ops: update Kconfig for paravirtualized guest and xen. ia64/xen: preliminary support for save/restore. ia64/xen: define xen machine vector for domU. ia64/pv_ops/xen: implement xen pv_time_ops. ia64/pv_ops/xen: implement xen pv_irq_ops. ia64/pv_ops/xen: define the nubmer of irqs which xen needs. ia64/pv_ops/xen: implement xen pv_iosapic_ops. ia64/pv_ops/xen: paravirtualize entry.S for ia64/xen. ia64/pv_ops/xen: paravirtualize ivt.S for xen. ia64/pv_ops/xen: paravirtualize DO_SAVE_MIN for xen. ia64/pv_ops/xen: define xen paravirtualized instructions for hand written assembly code ia64/pv_ops/xen: define xen pv_cpu_ops. ia64/pv_ops/xen: define xen pv_init_ops for various xen initialization. ia64/pv_ops/xen: elf note based xen startup. ...
2008-10-20always reserve elfcore header memory in crash kernelSimon Horman
elfcore header memory needs to be reserved in a crash kernel. This means that the relevant code should be protected by CONFIG_CRASH_DUMP rather than CONFIG_PROC_VMCORE. Signed-off-by: Simon Horman <horms@verge.net.au> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-20kdump: add is_vmcore_usable() and vmcore_unusable()Simon Horman
The usage of elfcorehdr_addr has changed recently such that being set to ELFCORE_ADDR_MAX is used by is_kdump_kernel() to indicate if the code is executing in a kernel executed as a crash kernel. However, arch/ia64/kernel/setup.c:reserve_elfcorehdr will rest elfcorehdr_addr to ELFCORE_ADDR_MAX on error, which means any subsequent calls to is_kdump_kernel() will return 0, even though they should return 1. Ok, at this point in time there are no subsequent calls, but I think its fair to say that there is ample scope for error or at the very least confusion. This patch add an extra state, ELFCORE_ADDR_ERR, which indicates that elfcorehdr_addr was passed on the command line, and thus execution is taking place in a crashdump kernel, but vmcore can't be used for some reason. This is tested for using is_vmcore_usable() and set using vmcore_unusable(). A subsequent patch makes use of this new code. To summarise, the states that elfcorehdr_addr can now be in are as follows: ELFCORE_ADDR_MAX: not a crashdump kernel ELFCORE_ADDR_ERR: crashdump kernel but vmcore is unusable any other value: crash dump kernel and vmcore is usable Signed-off-by: Simon Horman <horms@verge.net.au> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-20kdump: make elfcorehdr_addr independent of CONFIG_PROC_VMCOREVivek Goyal
o elfcorehdr_addr is used by not only the code under CONFIG_PROC_VMCORE but also by the code which is not inside CONFIG_PROC_VMCORE. For example, is_kdump_kernel() is used by powerpc code to determine if kernel is booting after a panic then use previous kernel's TCE table. So even if CONFIG_PROC_VMCORE is not set in second kernel, one should be able to correctly determine that we are booting after a panic and setup calgary iommu accordingly. o So remove the assumption that elfcorehdr_addr is under CONFIG_PROC_VMCORE. o Move definition of elfcorehdr_addr to arch dependent crash files. (Unfortunately crash dump does not have an arch independent file otherwise that would have been the best place). o kexec.c is not the right place as one can Have CRASH_DUMP enabled in second kernel without KEXEC being enabled. o I don't see sh setup code parsing the command line for elfcorehdr_addr. I am wondering how does vmcore interface work on sh. Anyway, I am atleast defining elfcoredhr_addr so that compilation is not broken on sh. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Simon Horman <horms@verge.net.au> Acked-by: Paul Mundt <lethal@linux-sh.org> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-17Pull vtd-iommu into release branchTony Luck
Conflicts: arch/ia64/kernel/acpi.c
2008-10-17Pull pv_ops-xen into release branchTony Luck
2008-10-17Pull utrace into release branchTony Luck
2008-10-17[IA64] Add Variable Page Size and IA64 Support in Intel IOMMUFenghua Yu
The patch contains Intel IOMMU IA64 specific code. It defines new machvec dig_vtd, hooks for IOMMU, DMAR table detection, cache line flush function, etc. For a generic kernel with CONFIG_DMAR=y, if Intel IOMMU is detected, dig_vtd is used for machinve vector. Otherwise, kernel falls back to dig machine vector. Kernel parameter "machvec=dig" or "intel_iommu=off" can be used to force kernel to boot dig machine vector. Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-10-17ia64/pv_ops: paravirtualized instruction checker.Isaku Yamahata
This patch implements a checker to detect instructions which should be paravirtualized instead of direct writing raw instruction. This patch does rough check so that it doesn't fully cover all cases, but it can detects most cases of paravirtualization breakage of hand written assembly codes. Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-10-17ia64/xen: define xen machine vector for domU.Isaku Yamahata
define xen machine vector for domU. Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-10-17ia64/pv_ops/xen: define the nubmer of irqs which xen needs.Isaku Yamahata
define arch/ia64/include/asm/xen/irq.h to define the number of irqs which xen needs. Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-10-17ia64/pv_ops/xen: elf note based xen startup.Isaku Yamahata
This patch enables elf note based xen startup for IA-64, which gives the kernel an early hint for running on xen like x86 case. In order to avoid the multi entry point, presumably extending booting protocol(i.e. extending struct ia64_boot_param) would be necessary. It probably means that elilo also needs modification. Signed-off-by: Qing He <qing.he@intel.com> Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-10-17ia64/xen: define several constants for ia64/xen.Isaku Yamahata
define several constants for ia64/xen. Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-10-17ia64: move function declaration, ia64_cpu_local_tick() from .c to .hIsaku Yamahata
eliminate the function declaration ia64_cpu_local_tick() in process.c by defining in arch/ia64/include/asm/timex.h The same function will be used in a different .c file later. Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-10-17ia64/pv_ops: avoid name conflict of get_irq_chip().Isaku Yamahata
The macro get_irq_chip() is defined in linux/include/linux/irq.h which cause name conflict with one in linux/arch/ia64/include/asm/paravirt.h. rename the latter to __get_irq_chip(). Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-10-17ia64/pv_ops: fix paravirtualization of ivt.S with CONFIG_SMP=nIsaku Yamahata
When CONFIG_SMP=n, three instruction in ivt.S were missed to paravirtualize. paravirtualize them. Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-10-08Merge branches 'sched/devel', 'sched/cpu-hotplug', 'sched/cpusets' and ↵Ingo Molnar
'sched/urgent' into sched/core
2008-10-06[IA64] utrace use generic trace hookShaohua Li
Make IA64 use generic trace hook in some paths. Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-10-06[IA64] utrace syscall.h support for ia64Shaohua Li
Add asm/syscall.h for IA64. Utrace requires this. Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-09-29[IA64] Put the space for cpu0 per-cpu area into .data sectionTony Luck
Initial fix for making sure that we can access percpu variables in all C code (commit: 10617bbe84628eb18ab5f723d3ba35005adde143) inadvertantly allocated the memory in the "percpu" section of the vmlinux ELF executable. This confused kexec/dump. Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-09-22[IA64] kexec fails on systems with blocks of uncached memoryJay Lan
Currently a memory segment in memory map with attribute of EFI_MEMORY_UC is denoted as "System RAM" in /proc/iomem, while memory of attribute (EFI_MEMORY_WB|EFI_MEMORY_UC) is also labeled the same. The kexec utility then includes uncached memory as part of vmcore. The kdump kernel MCA'ed when it tries to save the vmcore to a disk. A normal "cached" access may cause MCAs. This patch would label memory with attribute of EFI_MEMORY_UC only as "Uncached RAM" so that kexec would know not to include it in the vmcore. I will submit a separate kexec-tools patch to the kexec list. Signed-off-by: Jay Lan <jlan@sgi.com> Acked-by: Simon Horman <horms@verge.net.au> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-09-22[IA64] Ski simulator doesn't need check_sal_cache_flushAlex Chiang
Peter Chubb reported that commit 3463a93def55c309f3c0d0a8aaf216be3be42d64 (Update check_sal_cache_flush to use platform_send_ipi()) broke Ski because it does not implement IPIs. Tony Luck suggested we just #ifndef out the call (since the simulator does not have the SAL bug that this code is attempting to detect and workaround) Signed-off-by: Alex Chiang <achiang@hp.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-09-10[IA64] prevent ia64 from invoking irq handlers on offline CPUsPaul E. McKenney
Make ia64 refrain from clearing a given to-be-offlined CPU's bit in the cpu_online_mask until it has processed pending irqs. This change prevents other CPUs from being blindsided by an apparently offline CPU nevertheless changing globally visible state. Also remove the existing redundant cpu_clear(cpu, cpu_online_map). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-09-10[IA64] fix compile failure with non modular buildsJames Bottomley
Broke the non modular builds by moving an essential function into modules.c. Fix this by moving it out again and into asm/sections.h as an inline. To do this, the definitions of struct fdesc and struct got_val have been lifted out of modules.c and put in asm/elf.h where they belong. Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-09-09lib: Correct printk %pF to work on all architecturesJames Bottomley
It was introduced by "vsprintf: add support for '%pS' and '%pF' pointer formats" in commit 0fe1ef24f7bd0020f29ffe287dfdb9ead33ca0b2. However, the current way its coded doesn't work on parisc64. For two reasons: 1) parisc isn't in the #ifdef and 2) parisc has a different format for function descriptors Make dereference_function_descriptor() more accommodating by allowing architecture overrides. I put the three overrides (for parisc64, ppc64 and ia64) in arch/kernel/module.c because that's where the kernel internal linker which knows how to deal with function descriptors sits. Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Tony Luck <tony.luck@intel.com> Acked-by: Kyle McMartin <kyle@mcmartin.ca> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-09-08kernel/cpu.c: create a CPU_STARTING cpu_chain notifierManfred Spraul
Right now, there is no notifier that is called on a new cpu, before the new cpu begins processing interrupts/softirqs. Various kernel function would need that notification, e.g. kvm works around by calling smp_call_function_single(), rcu polls cpu_online_map. The patch adds a CPU_STARTING notification. It also adds a helper function that sends the message to all cpu_chain handlers. Tested on x86-64. All other archs are untested. Especially on sparc, I'm not sure if I got it right. Signed-off-by: Manfred Spraul <manfred@colorfullife.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-08-25[IA64] Fix ia64 build failure when CONFIG_SFC=mRobin Holt
CONFIG_SFC=m uses topology_core_siblings() which, for ia64, expects cpu_core_map to be exported. It is not. This patch exports the needed symbol. Maintainers note: This really looks like the wrong thing to do ... it would be much better for the kernel to export an API to provide drivers like this with data they need (which in the case of this driver seems to be an estimate of the effective parallelism available on the platform). But x86 has exported this forever ... so go with the flow until such an API is defined. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Signed-off-by: Robin Holt <holt@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-08-18[IA64] Shrink shadow_flush_counts to a short array to save 8k of per_cpu area.Robin Holt
Making allmodconfig will break the current build. This patch shrinks the per_cpu__shadow_flush_counts from 16k to 8k which frees enough space to allow allmodconfig to successfully complete. Fixes http://bugzilla.kernel.org/show_bug.cgi?id=11338 Signed-off-by: Robin Holt <holt@sgi.com> Acked-by: Jack Steiner <steiner@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-08-12[IA64] Ensure cpu0 can access per-cpu variables in early boot codeTony Luck
ia64 handles per-cpu variables a litle differently from other architectures in that it maps the physical memory allocated for each cpu at a constant virtual address (0xffffffffffff0000). This mapping is not enabled until the architecture specific cpu_init() function is run, which causes problems since some generic code is run before this point. In particular when CONFIG_PRINTK_TIME is enabled, the boot cpu will trap on the access to per-cpu memory at the first printk() call so the boot will fail without the kernel printing anything to the console. Fix this by allocating percpu memory for cpu0 in the kernel data section and doing all initialization to enable percpu access in head.S before calling any generic code. Other cpus must take care not to access per-cpu variables too early, but their code path from start_secondary() to cpu_init() is all in arch/ia64 Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-08-04[IA64] Cleanup generated file not ignored by .gitignoreRobin Holt
arch/ia64/kernel/vmlinux.lds is a generated file. Tell git to ignore it. Signed-off-by: Robin Holt <holt@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-08-04[IA64] pv_ops: fix ivt.S paravirtualizationIsaku Yamahata
Recent kernels are not booting on some HP systems (though it does boot on others). James and Willy reported the problem. James did the bisection to find the commit that caused the problem: 498c5170472ff0c03a29d22dbd33225a0be038f4. [IA64] pvops: paravirtualize ivt.S Two instructions were wrongly paravirtualized such that _FROM_ macro had been used where _TO_ was intended Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: "Wilcox, Matthew R" <matthew.r.wilcox@intel.com> Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-08-01[IA64] Move include/asm-ia64 to arch/ia64/include/asmTony Luck
After moving the the include files there were a few clean-ups: 1) Some files used #include <asm-ia64/xyz.h>, changed to <asm/xyz.h> 2) Some comments alerted maintainers to look at various header files to make matching updates if certain code were to be changed. Updated these comments to use the new include paths. 3) Some header files mentioned their own names in initial comments. Just deleted these self references. Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-07-26tracehook: wait_task_inactiveRoland McGrath
This extends wait_task_inactive() with a new argument so it can be used in a "soft" mode where it will check for the task changing state unexpectedly and back off. There is no change to existing callers. This lays the groundwork to allow robust, noninvasive tracing that can try to sample a blocked thread but back off safely if it wakes up. Signed-off-by: Roland McGrath <roland@redhat.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Reviewed-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-25Merge branch 'release' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6 * 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6: [IA64] Wire up new system calls
2008-07-25kprobes: improve kretprobe scalability with hashed lockingSrinivasa D S
Currently list of kretprobe instances are stored in kretprobe object (as used_instances,free_instances) and in kretprobe hash table. We have one global kretprobe lock to serialise the access to these lists. This causes only one kretprobe handler to execute at a time. Hence affects system performance, particularly on SMP systems and when return probe is set on lot of functions (like on all systemcalls). Solution proposed here gives fine-grain locks that performs better on SMP system compared to present kretprobe implementation. Solution: 1) Instead of having one global lock to protect kretprobe instances present in kretprobe object and kretprobe hash table. We will have two locks, one lock for protecting kretprobe hash table and another lock for kretporbe object. 2) We hold lock present in kretprobe object while we modify kretprobe instance in kretprobe object and we hold per-hash-list lock while modifying kretprobe instances present in that hash list. To prevent deadlock, we never grab a per-hash-list lock while holding a kretprobe lock. 3) We can remove used_instances from struct kretprobe, as we can track used instances of kretprobe instances using kretprobe hash table. Time duration for kernel compilation ("make -j 8") on a 8-way ppc64 system with return probes set on all systemcalls looks like this. cacheline non-cacheline Un-patched kernel aligned patch aligned patch =============================================================================== real 9m46.784s 9m54.412s 10m2.450s user 40m5.715s 40m7.142s 40m4.273s sys 2m57.754s 2m58.583s 3m17.430s =========================================================== Time duration for kernel compilation ("make -j 8) on the same system, when kernel is not probed. ========================= real 9m26.389s user 40m8.775s sys 2m7.283s ========================= Signed-off-by: Srinivasa DS <srinivasa@in.ibm.com> Signed-off-by: Jim Keniston <jkenisto@us.ibm.com> Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Cc: David S. Miller <davem@davemloft.net> Cc: Masami Hiramatsu <mhiramat@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-25[IA64] Wire up new system callsTony Luck
Six new system calls: signalfd4, eventfd2, epoll_create1, dup3, pipe2 and inotify_init1. Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-07-24flag parameters: pipeUlrich Drepper
This patch introduces the new syscall pipe2 which is like pipe but it also takes an additional parameter which takes a flag value. This patch implements the handling of O_CLOEXEC for the flag. I did not add support for the new syscall for the architectures which have a special sys_pipe implementation. I think the maintainers of those archs have the chance to go with the unified implementation but that's up to them. The implementation introduces do_pipe_flags. I did that instead of changing all callers of do_pipe because some of the callers are written in assembler. I would probably screw up changing the assembly code. To avoid breaking code do_pipe is now a small wrapper around do_pipe_flags. Once all callers are changed over to do_pipe_flags the old do_pipe function can be removed. The following test must be adjusted for architectures other than x86 and x86-64 and in case the syscall numbers changed. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #include <fcntl.h> #include <stdio.h> #include <unistd.h> #include <sys/syscall.h> #ifndef __NR_pipe2 # ifdef __x86_64__ # define __NR_pipe2 293 # elif defined __i386__ # define __NR_pipe2 331 # else # error "need __NR_pipe2" # endif #endif int main (void) { int fd[2]; if (syscall (__NR_pipe2, fd, 0) != 0) { puts ("pipe2(0) failed"); return 1; } for (int i = 0; i < 2; ++i) { int coe = fcntl (fd[i], F_GETFD); if (coe == -1) { puts ("fcntl failed"); return 1; } if (coe & FD_CLOEXEC) { printf ("pipe2(0) set close-on-exit for fd[%d]\n", i); return 1; } } close (fd[0]); close (fd[1]); if (syscall (__NR_pipe2, fd, O_CLOEXEC) != 0) { puts ("pipe2(O_CLOEXEC) failed"); return 1; } for (int i = 0; i < 2; ++i) { int coe = fcntl (fd[i], F_GETFD); if (coe == -1) { puts ("fcntl failed"); return 1; } if ((coe & FD_CLOEXEC) == 0) { printf ("pipe2(O_CLOEXEC) does not set close-on-exit for fd[%d]\n", i); return 1; } } close (fd[0]); close (fd[1]); puts ("OK"); return 0; } ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Signed-off-by: Ulrich Drepper <drepper@redhat.com> Acked-by: Davide Libenzi <davidel@xmailserver.org> Cc: Michael Kerrisk <mtk.manpages@googlemail.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-21sysdev: Pass the attribute to the low level sysdev show/store functionAndi Kleen
This allow to dynamically generate attributes and share show/store functions between attributes. Right now most attributes are generated by special macros and lots of duplicated code. With the attribute passed it's instead possible to attach some data to the attribute and then use that in shared low level functions to do different things. I need this for the dynamically generated bank attributes in the x86 machine check code, but it'll allow some further cleanups. I converted all users in tree to the new show/store prototype. It's a single huge patch to avoid unbisectable sections. Runtime tested: x86-32, x86-64 Compiled only: ia64, powerpc Not compile tested/only grep converted: sh, arm, avr32 Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-07-17[IA64] Avoid overflowing ia64_cpu_to_sapicid in acpi_map_lsapic()Alex Chiang
acpi_map_lsapic tries to stuff a long into ia64_cpu_to_sapicid[], which can only hold ints, so let's fix that. We need to update the signature of acpi_map_cpu2node() too. Signed-off-by: Alex Chiang <achiang@hp.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-07-17 [IA64] adding parameter check to module_free()Akiyama, Nobuyuki
module_free() refers the first parameter before checking. But it is called like below(in kernel/kprobes). The first parameter is always NULL. This happens when many probe points(>1024) are set by kprobes. I encountered this with using SystemTap. It can set many probes easily. static int __kprobes collect_one_slot(struct kprobe_insn_page *kip, int idx) { ... if (kip->nused == 0) { hlist_del(&kip->hlist); if (hlist_empty(&kprobe_insn_pages)) { ... } else { module_free(NULL, kip->insns); //<<< 1st param always NULL kfree(kip); } return 1; } return 0; } Signed-off-by: Akiyama, Nobuyuki <akiyama.nobuyuk@jp.fujitsu.com> Signed-off-by: Tony Luck <tony.luck@intel.com>