powertop: fix cpuid asm: ebx saving/restoring is properly done by gcc

function                                             old     new   delta
print_intel_cstates                                  481     477      -4

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 1 insertions, 4 deletions

diff --git a/procps/powertop.c b/procps/powertop.c
index 24c2b320f..18ddaa3ec 100644
--- a/procps/powertop.c
+++ b/procps/powertop.c
@@ -506,12 +506,9 @@ static void cpuid(unsigned int *eax, unsigned int *ebx, unsigned int *ecx,
 {
         /* EAX value specifies what information to return */
         asm (
-                "       pushl %%ebx\n"     /* Save EBX */
                 "       cpuid\n"
-                "       movl %%ebx, %1\n"  /* Save content of EBX */
-                "       popl %%ebx\n"      /* Restore EBX */
                 : "=a"(*eax), /* Output */
-                  "=r"(*ebx),
+                  "=b"(*ebx),
                   "=c"(*ecx),
                   "=d"(*edx)
                 : "0"(*eax),  /* Input */