linux/arch/x86/kernel/cpu
Jeremy Fitzhardinge 1ea0d14e48 x86/i386: Make sure stack-protector segment base is cache aligned
The Intel Optimization Reference Guide says:

	In Intel Atom microarchitecture, the address generation unit
	assumes that the segment base will be 0 by default. Non-zero
	segment base will cause load and store operations to experience
	a delay.
		- If the segment base isn't aligned to a cache line
		  boundary, the max throughput of memory operations is
		  reduced to one [e]very 9 cycles.
	[...]
	Assembly/Compiler Coding Rule 15. (H impact, ML generality)
	For Intel Atom processors, use segments with base set to 0
	whenever possible; avoid non-zero segment base address that is
	not aligned to cache line boundary at all cost.

We can't avoid having a non-zero base for the stack-protector
segment, but we can make it cache-aligned.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: <stable@kernel.org>
LKML-Reference: <4AA01893.6000507@goop.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-03 21:30:51 +02:00
..
cpufreq Remove multiple KERN_ prefixes from printk formats 2009-07-08 10:30:03 -07:00
mcheck x86, mce: Don't initialize MCEs on unknown CPUs 2009-08-17 13:28:25 +02:00
mtrr Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-06-10 15:49:36 -07:00
.gitignore
addon_cpuid_features.c x86 ACPI: Add support for Always Running APIC timer 2009-04-07 18:17:51 -04:00
amd.c x86: Clear incorrectly forced X86_FEATURE_LAHF_LM flag 2009-08-11 13:34:54 +02:00
bugs_64.c
bugs.c
centaur.c
cmpxchg.c
common.c x86/i386: Make sure stack-protector segment base is cache aligned 2009-09-03 21:30:51 +02:00
cpu_debug.c Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-06-10 15:51:15 -07:00
cpu.h
cyrix.c
hypervisor.c
intel_cacheinfo.c x86: cacheinfo: complete L2/L3 Cache and TLB associativity field definitions 2009-04-10 15:41:18 +02:00
intel.c x86: add hooks for kmemcheck 2009-06-15 12:40:02 +02:00
Makefile Merge branch 'bugfix' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen into x86/urgent 2009-08-20 12:05:24 +02:00
mkcapflags.pl
perf_counter.c perf_counter, x86: Fix/improve apic fallback 2009-08-12 14:12:49 +02:00
perfctr-watchdog.c x86: Remove unused function lapic_watchdog_ok() 2009-07-03 14:34:31 +02:00
powerflags.c
proc.c x86: show number of core_siblings instead of thread_siblings in /proc/cpuinfo 2009-05-04 20:36:49 +02:00
transmeta.c
umc.c
vmware.c