linux/arch/x86/kernel/cpu
Krzysztof Helt 94f6bac105 x86: do not allow to optimize flag_is_changeable_p() (rev. 2)
The flag_is_changeable_p() is used by
has_cpuid_p() which can return different results
in the code sequence below:

 if (!have_cpuid_p())
      identify_cpu_without_cpuid(c);

  /* cyrix could have cpuid enabled via c_identify()*/
  if (!have_cpuid_p())
      return;

Otherwise, the gcc 3.4.6 optimizes these two calls
into one which make the code not working correctly.

Cyrix cpus have the CPUID instruction enabled before
the second call to the have_cpuid_p() but
it is not detected due to the gcc optimization.
Thus the ARR registers (mtrr like) are not detected
on such a cpu.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-13 10:33:13 +02:00
..
cpufreq Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq 2008-10-11 08:49:34 -07:00
mcheck x86-64: add two __cpuinit annotations 2008-09-06 19:50:41 +02:00
mtrr Merge branches 'x86/alternatives', 'x86/cleanups', 'x86/commandline', 'x86/crashdump', 'x86/debug', 'x86/defconfig', 'x86/doc', 'x86/exports', 'x86/fpu', 'x86/gart', 'x86/idle', 'x86/mm', 'x86/mtrr', 'x86/nmi-watchdog', 'x86/oprofile', 'x86/paravirt', 'x86/reboot', 'x86/sparse-fixes', 'x86/tsc', 'x86/urgent' and 'x86/vmalloc' into x86-v28-for-linus-phase1 2008-10-06 18:17:07 +02:00
addon_cpuid_features.c Merge branch 'linus' into x86/x2apic 2008-09-04 13:02:35 +02:00
amd.c x86: make amd.c have 64bit support code 2008-09-08 15:32:02 +02:00
bugs.c x86: fdiv bug detection fix 2008-07-31 23:56:27 +02:00
bugs_64.c x86: move bugs_64.c to cpu/bugs_64.c 2008-06-03 14:43:00 -07:00
centaur.c x86: move mtrr cpu cap setting early in early_init_xxxx 2008-09-06 17:50:55 +02:00
centaur_64.c x86: centaur_64.c remove duplicated setting of CONSTANT_TSC 2008-09-10 08:21:06 +02:00
cmpxchg.c x86: move cmpxchg fallbacks to a generic place 2008-08-18 16:05:47 +02:00
common.c x86: do not allow to optimize flag_is_changeable_p() (rev. 2) 2008-10-13 10:33:13 +02:00
cpu.h x86: remove duplicated get_model_name() calling 2008-09-06 14:09:12 +02:00
cyrix.c x86: move mtrr cpu cap setting early in early_init_xxxx 2008-09-06 17:50:55 +02:00
intel.c x86: extended "flags" to show virtualization HW feature in /proc/cpuinfo 2008-09-10 14:00:56 +02:00
intel_cacheinfo.c Merge branch 'linus' into x86/cpu 2008-08-15 16:16:15 +02:00
Makefile x86: let intel 64-bit use intel.c 2008-09-10 08:21:05 +02:00
mkcapflags.pl x86: generate names for /proc/cpuinfo from <asm/cpufeature.h> 2008-08-27 19:23:22 -07:00
perfctr-watchdog.c x86, NMI watchdog: setup before enabling NMI watchdog 2008-09-22 19:48:19 +02:00
powerflags.c x86: generate names for /proc/cpuinfo from <asm/cpufeature.h> 2008-08-27 19:23:22 -07:00
proc.c NR_CPUS: Replace NR_CPUS in arch/x86/kernel/cpu/proc.c 2008-07-20 10:21:09 +02:00
transmeta.c x86: move transmeta cap read to early_init_transmeta() 2008-09-14 14:09:14 +02:00
umc.c x86: remove cpu_vendor_dev 2008-09-04 21:09:45 +02:00