[PATCH, tip] x86: use PCI method for enabling AMD extended config space before MSR method

While both methods should work equivalently well for the native case, the Xen Dom0 case can't reliably work with the MSR one, since there's no guarantee that the virtual CPUs it has available fully cover all necessary physical ones. As per the ...

Message posted on the January 7th, 2011 - 11:40 AM ET

[PATCH tip:x86/mm 1/3] x86: A fast way to check capabilities of the current cpu

From: Christoph Lameter <cl@linux.com> Add this_cpu_has() which determines if the current cpu has a certain ability using a segment prefix and a bit test operation. For that we need to add bit operations to x86s percpu.h. Many uses of ...

Message posted on the March 12th, 2011 - 7:00 AM ET

[PATCH -tip] x86,perf: P4 PMU -- protect sensible procedures from preemption

Message posted on the May 7th, 2010 - 11:10 AM ET

[PATCH -tip] x86,perf: P4 PMU -- protect sensible procedures from preemption

Message posted on the May 5th, 2010 - 11:10 AM ET

[PATCH -tip] x86, perf: A few cosmetic dabs for p4 pmu (comments and constantify)

- A few ESCR have escaped fixing at previous attempt. - p4_escr_map is read only, make it const. Nothing serious. Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> | commit f53d69aedd592348e9f862c429f8fc99159ac7fc | Merge: f10893e ...

Message posted on the March 18th, 2010 - 4:20 PM ET

[PATCH -tip] x86,perf: P4 PMU -- use hash for p4_get_escr_idx v2

Linear search over all p4 MSRs should be fine if only we would not use it in events scheduling routine which is pretty time crititcal. Lets use hashes. It should speed scheduling up significantly. v2: Steven proposed to use more gentle approach ...

Message posted on the May 12th, 2010 - 1:50 PM ET

[PATCH -tip] x86: correct stack dump info when CONFIG_FRAME_POINTER=y

Current stack dump code scans entire stack and check each entry contains a pointer to kernel code. If CONFIG_FRAME_POINTER=y it could mark whether the pointer is valid or not based on value of the frame pointer. A invalid entry could be preceded by ...

Message posted on the March 2nd, 2011 - 12:20 PM ET

[PATCH tip:x86/urgent] x86, NUMA: Fix empty memblk detection in numa_cleanup_meminfo()

From: Yinghai Lu <yinghai@kernel.org> numa_cleanup_meminfo() trims each memblk between low (0) and high (max_pfn) limits and discards empty ones. However, the emptiness detection incorrectly used equality test. If the start of a memblk is ...

Message posted on the May 1st, 2011 - 6:50 AM ET

[PATCH -tip] x86, perf: P4 PMU - Fix typos in comments and style cleanup

This patch fixes typos in comments, renames obscure p4_event_alias::original and ::alter members to ::original and ::alternative as appropriate, and finally drops parenthesis from the return of p4_get_alias_event to fit coding style. No functional ...

Message posted on the July 21st, 2011 - 12:10 PM ET

[PATCH tip:x86/mm] x86-64, NUMA: Remove custom phys_to_nid() implementation

phys_to_nid() maps physical address to NUMA node id. This is implemented by building perfect hash in compute_hash_shift() during initialization. However, with SPARSE memory model, the nid is encoded in page flags. The perfect hash implementation ...

Message posted on the March 31st, 2011 - 10:00 AM ET

[RFC PATCH tip ] x86: add stack top margin for stack overflow checking

It seems that a margin for stack overflow checking is added to top of a kernel stack but is not added to IRQ and exception stacks in stack_overflow_check(). Therefore, the overflows of IRQ and exception stacks are always detected only after they ...

Message posted on the December 7th, 2011 - 3:30 AM ET

[PATCH -tip] x86: fix build without CONFIG_X86_MRST

Fix compilation error when compiled with CONFIG_X86_INTEL_MID and without CONFIG_X86_MRST: arch/x86/built-in.o: In function `add_rtc_cmos': rtc.c:(.init.text+0x34bd): undefined reference to `__mrst_cpu_chip' Problem was caused currently by: ...

Message posted on the December 6th, 2011 - 5:20 AM ET

[PATCH tip:x86/urgent] x86-32, NUMA: Fix ACPI NUMA init broken by recent x86-64 change

Commit d8fc3afc49 (x86, NUMA: Move *_numa_init() invocations into initmem_init()) moved acpi_numa_init() call into NUMA initmem_init() but forgot to update 32bit NUMA init breking ACPI NUMA configuration for 32bit. acpi_numa_init() call was later ...

Message posted on the April 4th, 2011 - 6:10 AM ET

[PATCH tip/x86/numa] x86: Rename incorrectly named parameter of numa_cpu_node()

numa_cpu_node() prototype in numa_32.h has wrongly named parameter @apicid when it actually takes the CPU number. Change it to @cpu. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Yinghai Lu <yinghai@kernel.org> ...

Message posted on the January 31st, 2011 - 11:00 AM ET

patch tip x86