Kernel/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2025-01-09 14:43:16 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

selftests/x86/corrupt_xstate_header: Use provided __cpuid_count() macro

Browse Source 
kselftest.h makes the __cpuid_count() macro available
to conveniently call the CPUID instruction.

Remove the local CPUID wrapper and use __cpuid_count()
from kselftest.h instead.

__cpuid_count() from kselftest.h is used instead of the
macro provided by the compiler since gcc v4.4 (via cpuid.h)
because the selftest needs to be supported with gcc v3.2,
the minimal required version for stable kernels.

Cc: Andy Lutomirski <luto@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Reinette Chatre 2022-04-25 14:01:14 -07:00 committed by Shuah Khan
parent 2ba8a7abb5
commit 170d1c23f2
1 changed files with 2 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
tools/testing/selftests/x86/corrupt_xstate_header.c
View File

@ -17,25 +17,13 @@
#include <stdint.h>
#include <sys/wait.h>
static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
unsigned int *ecx, unsigned int *edx)
{
asm volatile(
"cpuid;"
: "=a" (*eax),
"=b" (*ebx),
"=c" (*ecx),
"=d" (*edx)
: "0" (*eax), "2" (*ecx));
}
#include "../kselftest.h" /* For __cpuid_count() */
static inline int xsave_enabled(void)
{
unsigned int eax, ebx, ecx, edx;
eax = 0x1;
ecx = 0x0;
__cpuid(&eax, &ebx, &ecx, &edx);
__cpuid_count(0x1, 0x0, eax, ebx, ecx, edx);
/* Is CR4.OSXSAVE enabled ? */
return ecx & (1U << 27);