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perf tools: Introduce weak alternative to sched_getcpu()

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Which is just a wrapper for sys_getcpu and is not present in at least
musl libc.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-kblef7svmhr0g93kkx78envg@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2016-07-12 10:29:31 -03:00
parent 4998a12246
commit c7007e9836
4 changed files with 20 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
tools/arch/x86/include/asm/unistd_32.h
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@ -7,3 +7,6 @@
#ifndef __NR_gettid #ifndef __NR_gettid
# define __NR_gettid 224 # define __NR_gettid 224
#endif #endif
#ifndef __NR_getcpu
# define __NR_getcpu 318
#endif

3
tools/arch/x86/include/asm/unistd_64.h
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@ -7,3 +7,6 @@
#ifndef __NR_gettid #ifndef __NR_gettid
# define __NR_gettid 186 # define __NR_gettid 186
#endif #endif
#ifndef __NR_getcpu
# define __NR_getcpu 309
#endif

14
tools/perf/util/cloexec.c
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@ -4,18 +4,24 @@
#include "cloexec.h" #include "cloexec.h"
#include "asm/bug.h" #include "asm/bug.h"
#include "debug.h" #include "debug.h"
#include <unistd.h>
#include <asm/unistd.h>
#include <sys/syscall.h>
static unsigned long flag = PERF_FLAG_FD_CLOEXEC; static unsigned long flag = PERF_FLAG_FD_CLOEXEC;
#ifdef __GLIBC_PREREQ
#if !__GLIBC_PREREQ(2, 6)
int __weak sched_getcpu(void) int __weak sched_getcpu(void)
{ {
#ifdef __NR_getcpu
unsigned cpu;
int err = syscall(__NR_getcpu, &cpu, NULL, NULL);
if (!err)
return cpu;
#else
errno = ENOSYS; errno = ENOSYS;
#endif
return -1; return -1;
} }
#endif
#endif
static int perf_flag_probe(void) static int perf_flag_probe(void)
{ {

4
tools/perf/util/util.h
View File

@ -361,4 +361,8 @@ void print_binary(unsigned char *data, size_t len,
size_t bytes_per_line, print_binary_t printer, size_t bytes_per_line, print_binary_t printer,
void *extra); void *extra);
#ifndef __GLIBC__
extern int sched_getcpu(void);
#endif
#endif /* GIT_COMPAT_UTIL_H */ #endif /* GIT_COMPAT_UTIL_H */