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>

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index dbcbf27..51741a1 100644 (file)
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -35,6 +35,7 @@
 #include <string.h>
 #include <ctype.h>
 #include <sched.h>
+#include <cpuid.h>
 
 char *proc_stat = "/proc/stat";
 unsigned int interval_sec = 5; /* set with -i interval_sec */
@@ -1978,7 +1979,7 @@ void check_cpuid()
 
        eax = ebx = ecx = edx = 0;
 
-       asm("cpuid" : "=a" (max_level), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0));
+       __get_cpuid(0, &max_level, &ebx, &ecx, &edx);
 
        if (ebx == 0x756e6547 && edx == 0x49656e69 && ecx == 0x6c65746e)
                genuine_intel = 1;
@@ -1987,7 +1988,7 @@ void check_cpuid()
                fprintf(stderr, "CPUID(0): %.4s%.4s%.4s ",
                        (char *)&ebx, (char *)&edx, (char *)&ecx);
 
-       asm("cpuid" : "=a" (fms), "=c" (ecx), "=d" (edx) : "a" (1) : "ebx");
+       __get_cpuid(1, &fms, &ebx, &ecx, &edx);
        family = (fms >> 8) & 0xf;
        model = (fms >> 4) & 0xf;
        stepping = fms & 0xf;
@@ -2009,7 +2010,7 @@ void check_cpuid()
         * This check is valid for both Intel and AMD.
         */
        ebx = ecx = edx = 0;
-       asm("cpuid" : "=a" (max_level), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0x80000000));
+       __get_cpuid(0x80000000, &max_level, &ebx, &ecx, &edx);
 
        if (max_level < 0x80000007) {
                fprintf(stderr, "CPUID: no invariant TSC (max_level 0x%x)\n", max_level);
@@ -2020,7 +2021,7 @@ void check_cpuid()
         * Non-Stop TSC is advertised by CPUID.EAX=0x80000007: EDX.bit8
         * this check is valid for both Intel and AMD
         */
-       asm("cpuid" : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0x80000007));
+       __get_cpuid(0x80000007, &eax, &ebx, &ecx, &edx);
        has_invariant_tsc = edx & (1 << 8);
 
        if (!has_invariant_tsc) {
@@ -2033,7 +2034,7 @@ void check_cpuid()
         * this check is valid for both Intel and AMD
         */
 
-       asm("cpuid" : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0x6));
+       __get_cpuid(0x6, &eax, &ebx, &ecx, &edx);
        has_aperf = ecx & (1 << 0);
        do_dts = eax & (1 << 0);
        do_ptm = eax & (1 << 6);