tree 258e2dae597dcb2278760c0aee97188b803ea5cf
parent 2e9c6bc7fb6ffc32d83bc133e4a7389125e8eb0a
author Josh Triplett <josh@joshtriplett.org> 1377044414 -0700
committer Len Brown <len.brown@intel.com> 1390102448 -0500

turbostat: Use GCC's CPUID functions to support PIC

turbostat uses inline assembly to call cpuid.  On 32-bit x86, on systems
that have certain security features enabled by default that make -fPIC
the default, this causes a build error:

turbostat.c: In function ‘check_cpuid’:
turbostat.c:1906:2: error: PIC register clobbered by ‘ebx’ in ‘asm’
  asm("cpuid" : "=a" (fms), "=c" (ecx), "=d" (edx) : "a" (1) : "ebx");
  ^

GCC provides a header cpuid.h, containing a __get_cpuid function that
works with both PIC and non-PIC.  (On PIC, it saves and restores ebx
around the cpuid instruction.)  Use that instead.

Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Cc: stable@vger.kernel.org
Signed-off-by: Len Brown <len.brown@intel.com>