diff options
| author | H. Peter Anvin <hpa@linux.intel.com> | 2012-11-28 11:50:29 -0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-11-29 13:23:03 -0800 |
| commit | e3228cf4544355f73437a2b9c6916be9cbafc201 (patch) | |
| tree | 7632f9ad5c3db45c9668ea18ad447cb719acea37 /arch/x86/kernel/cpu | |
| parent | a5c2a893dbd4956a72fb261e8790d19f67b52c99 (diff) | |
x86, 386 removal: Remove CONFIG_X86_POPAD_OK
The check_popad() routine tested for a 386-specific bug, and never
actually did anything useful with it anyway other than print a
message.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1354132230-21854-8-git-send-email-hpa@linux.intel.com
Diffstat (limited to 'arch/x86/kernel/cpu')
| -rw-r--r-- | arch/x86/kernel/cpu/bugs.c | 28 |
1 files changed, 0 insertions, 28 deletions
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index 0cd07ccdf38..92dfec986a4 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -107,33 +107,6 @@ static void __init check_hlt(void) } /* - * Most 386 processors have a bug where a POPAD can lock the - * machine even from user space. - */ - -static void __init check_popad(void) -{ -#ifndef CONFIG_X86_POPAD_OK - int res, inp = (int) &res; - - pr_info("Checking for popad bug... "); - __asm__ __volatile__( - "movl $12345678,%%eax; movl $0,%%edi; pusha; popa; movl (%%edx,%%edi),%%ecx " - : "=&a" (res) - : "d" (inp) - : "ecx", "edi"); - /* - * If this fails, it means that any user program may lock the - * CPU hard. Too bad. - */ - if (res != 12345678) - pr_cont("Buggy\n"); - else - pr_cont("OK\n"); -#endif -} - -/* * Check whether we are able to run this kernel safely on SMP. * * - i386 is no longer supported. @@ -157,7 +130,6 @@ void __init check_bugs(void) #endif check_config(); check_hlt(); - check_popad(); init_utsname()->machine[1] = '0' + (boot_cpu_data.x86 > 6 ? 6 : boot_cpu_data.x86); alternative_instructions(); |