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x86, 386 removal: Remove CONFIG_X86_POPAD_OK

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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
This commit is contained in:
H. Peter Anvin 2012-11-28 11:50:29 -08:00
parent a5c2a893db
commit e3228cf454
2 changed files with 0 additions and 32 deletions
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4
arch/x86/Kconfig.cpu
View file

@ -325,10 +325,6 @@ config X86_INVD_BUG
def_bool y def_bool y
depends on M486 depends on M486
config X86_POPAD_OK
def_bool y
depends on X86_32
config X86_ALIGNMENT_16 config X86_ALIGNMENT_16
def_bool y def_bool y
depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1 depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1

28
arch/x86/kernel/cpu/bugs.c
View file

@ -106,33 +106,6 @@ static void __init check_hlt(void)
pr_cont("OK\n"); pr_cont("OK\n");
} }
/*
* 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. * Check whether we are able to run this kernel safely on SMP.
* *
@ -157,7 +130,6 @@ void __init check_bugs(void)
#endif #endif
check_config(); check_config();
check_hlt(); check_hlt();
check_popad();
init_utsname()->machine[1] = init_utsname()->machine[1] =
'0' + (boot_cpu_data.x86 > 6 ? 6 : boot_cpu_data.x86); '0' + (boot_cpu_data.x86 > 6 ? 6 : boot_cpu_data.x86);
alternative_instructions(); alternative_instructions();