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| author | Glauber de Oliveira Costa <gcosta@redhat.com> | 2008-01-30 13:31:06 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:31:06 +0100 |
| commit | 8f12dea6135d0a55b151dcb4c6bbe211f5f8d35d (patch) | |
| tree | 3c4c486ffb318aa90e0bf75402d22348f7ae1525 /arch | |
| parent | x86: unify cpuid functions (diff) | |
| download | linux-8f12dea6135d0a55b151dcb4c6bbe211f5f8d35d.tar.xz linux-8f12dea6135d0a55b151dcb4c6bbe211f5f8d35d.zip | |
x86: introduce native_read_tscp
Targetting paravirt, this patch introduces native_read_tscp, in
place of rdtscp() macro. When in a paravirt guest, this will
involve a function call, and thus, cannot be done in the vdso area.
These users then have to call the native version directly
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/vsyscall_64.c | 4 | ||||
| -rw-r--r-- | arch/x86/vdso/vgetcpu.c | 4 |
2 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c index 018f7cf33790..c4c5e765cd2c 100644 --- a/arch/x86/kernel/vsyscall_64.c +++ b/arch/x86/kernel/vsyscall_64.c @@ -190,7 +190,7 @@ time_t __vsyscall(1) vtime(time_t *t) long __vsyscall(2) vgetcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *tcache) { - unsigned int dummy, p; + unsigned int p; unsigned long j = 0; /* Fast cache - only recompute value once per jiffies and avoid @@ -205,7 +205,7 @@ vgetcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *tcache) p = tcache->blob[1]; } else if (__vgetcpu_mode == VGETCPU_RDTSCP) { /* Load per CPU data from RDTSCP */ - rdtscp(dummy, dummy, p); + native_read_tscp(&p); } else { /* Load per CPU data from GDT */ asm("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG)); diff --git a/arch/x86/vdso/vgetcpu.c b/arch/x86/vdso/vgetcpu.c index 3b1ae1abfba9..c8097f17f8a9 100644 --- a/arch/x86/vdso/vgetcpu.c +++ b/arch/x86/vdso/vgetcpu.c @@ -15,11 +15,11 @@ long __vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused) { - unsigned int dummy, p; + unsigned int p; if (*vdso_vgetcpu_mode == VGETCPU_RDTSCP) { /* Load per CPU data from RDTSCP */ - rdtscp(dummy, dummy, p); + native_read_tscp(&p); } else { /* Load per CPU data from GDT */ asm("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG)); |