Merge branch 'linus' into cpus4096

[pandora-kernel.git] / arch / x86 / vdso / vgetcpu.c

diff --git a/arch/x86/vdso/vgetcpu.c b/arch/x86/vdso/vgetcpu.c
index 91f6e85..9fbc6b2 100644 (file)
--- a/arch/x86/vdso/vgetcpu.c
+++ b/arch/x86/vdso/vgetcpu.c
@@ -13,32 +13,18 @@
 #include <asm/vgtod.h>
 #include "vextern.h"
 
-long __vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *tcache)
+notrace long
+__vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused)
 {
-       unsigned int dummy, p;
-       unsigned long j = 0;
+       unsigned int p;
 
-       /* Fast cache - only recompute value once per jiffies and avoid
-          relatively costly rdtscp/cpuid otherwise.
-          This works because the scheduler usually keeps the process
-          on the same CPU and this syscall doesn't guarantee its
-          results anyways.
-          We do this here because otherwise user space would do it on
-          its own in a likely inferior way (no access to jiffies).
-          If you don't like it pass NULL. */
-       if (tcache && tcache->blob[0] == (j = *vdso_jiffies)) {
-               p = tcache->blob[1];
-       } else if (*vdso_vgetcpu_mode == VGETCPU_RDTSCP) {
+       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));
        }
-       if (tcache) {
-               tcache->blob[0] = j;
-               tcache->blob[1] = p;
-       }
        if (cpu)
                *cpu = p & 0xfff;
        if (node)