Commit b6ad92d4 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by Ingo Molnar
Browse files

x86_64: vdso32 cleanup using feature flags



Use the X86_FEATURE_SYSENTER32 to remove hard-coded CPU vendor check.
Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 8d28aab5
......@@ -203,20 +203,11 @@ static struct page *vdso32_pages[1];
#ifdef CONFIG_X86_64
static int use_sysenter __read_mostly = -1;
#define vdso32_sysenter() (use_sysenter > 0)
#define vdso32_sysenter() (boot_cpu_has(X86_FEATURE_SYSENTER32))
/* May not be __init: called during resume */
void syscall32_cpu_init(void)
{
if (use_sysenter < 0) {
if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
use_sysenter = 1;
if (boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR)
use_sysenter = 1;
}
/* Load these always in case some future AMD CPU supports
SYSENTER from compat mode too. */
checking_wrmsrl(MSR_IA32_SYSENTER_CS, (u64)__KERNEL_CS);
......
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