perf tools: Make fetch_kernel_version() publicly available

There are 2 places in llvm-utils.c which find kernel version information
through uname. This patch extracts the uname related code into a
fetch_kernel_version() function and puts it into util.h so it can be
reused.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1446818135-87310-1-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wang Nan 2015-11-06 13:55:35 +00:00 committed by Arnaldo Carvalho de Melo
parent 45825d8ab8
commit 07bc5c699a
3 changed files with 50 additions and 34 deletions

View File

@ -4,7 +4,6 @@
*/
#include <stdio.h>
#include <sys/utsname.h>
#include "util.h"
#include "debug.h"
#include "llvm-utils.h"
@ -216,18 +215,19 @@ static int detect_kbuild_dir(char **kbuild_dir)
const char *suffix_dir = "";
char *autoconf_path;
struct utsname utsname;
int err;
if (!test_dir) {
err = uname(&utsname);
if (err) {
pr_warning("uname failed: %s\n", strerror(errno));
return -EINVAL;
}
/* _UTSNAME_LENGTH is 65 */
char release[128];
test_dir = utsname.release;
err = fetch_kernel_version(NULL, release,
sizeof(release));
if (err)
return -EINVAL;
test_dir = release;
prefix_dir = "/lib/modules/";
suffix_dir = "/build";
}
@ -325,38 +325,18 @@ get_kbuild_opts(char **kbuild_dir, char **kbuild_include_opts)
pr_debug("include option is set to %s\n", *kbuild_include_opts);
}
static unsigned long
fetch_kernel_version(void)
{
struct utsname utsname;
int version, patchlevel, sublevel, err;
if (uname(&utsname))
return 0;
err = sscanf(utsname.release, "%d.%d.%d",
&version, &patchlevel, &sublevel);
if (err != 3) {
pr_debug("Unablt to get kernel version from uname '%s'\n",
utsname.release);
return 0;
}
return (version << 16) + (patchlevel << 8) + sublevel;
}
int llvm__compile_bpf(const char *path, void **p_obj_buf,
size_t *p_obj_buf_sz)
{
size_t obj_buf_sz;
void *obj_buf = NULL;
int err, nr_cpus_avail;
char clang_path[PATH_MAX], nr_cpus_avail_str[64];
unsigned int kernel_version;
char linux_version_code_str[64];
const char *clang_opt = llvm_param.clang_opt;
const char *template = llvm_param.clang_bpf_cmd_template;
char clang_path[PATH_MAX], nr_cpus_avail_str[64];
char *kbuild_dir = NULL, *kbuild_include_opts = NULL;
void *obj_buf = NULL;
size_t obj_buf_sz;
const char *template = llvm_param.clang_bpf_cmd_template;
if (!template)
template = CLANG_BPF_CMD_DEFAULT_TEMPLATE;
@ -388,8 +368,11 @@ int llvm__compile_bpf(const char *path, void **p_obj_buf,
snprintf(nr_cpus_avail_str, sizeof(nr_cpus_avail_str), "%d",
nr_cpus_avail);
if (fetch_kernel_version(&kernel_version, NULL, 0))
kernel_version = 0;
snprintf(linux_version_code_str, sizeof(linux_version_code_str),
"0x%lx", fetch_kernel_version());
"0x%x", kernel_version);
force_set_env("NR_CPUS", nr_cpus_avail_str);
force_set_env("LINUX_VERSION_CODE", linux_version_code_str);

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@ -3,6 +3,7 @@
#include "debug.h"
#include <api/fs/fs.h>
#include <sys/mman.h>
#include <sys/utsname.h>
#ifdef HAVE_BACKTRACE_SUPPORT
#include <execinfo.h>
#endif
@ -665,3 +666,32 @@ bool find_process(const char *name)
closedir(dir);
return ret ? false : true;
}
int
fetch_kernel_version(unsigned int *puint, char *str,
size_t str_size)
{
struct utsname utsname;
int version, patchlevel, sublevel, err;
if (uname(&utsname))
return -1;
if (str && str_size) {
strncpy(str, utsname.release, str_size);
str[str_size - 1] = '\0';
}
err = sscanf(utsname.release, "%d.%d.%d",
&version, &patchlevel, &sublevel);
if (err != 3) {
pr_debug("Unablt to get kernel version from uname '%s'\n",
utsname.release);
return -1;
}
if (puint)
*puint = (version << 16) + (patchlevel << 8) + sublevel;
return 0;
}

View File

@ -350,4 +350,7 @@ static inline char *asprintf_expr_not_in_ints(const char *var, size_t nints, int
int get_stack_size(const char *str, unsigned long *_size);
int fetch_kernel_version(unsigned int *puint,
char *str, size_t str_sz);
#endif /* GIT_COMPAT_UTIL_H */