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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>
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3 changed files with 50 additions and 34 deletions
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@ -4,7 +4,6 @@
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*/
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#include <stdio.h>
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#include <sys/utsname.h>
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#include "util.h"
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#include "debug.h"
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#include "llvm-utils.h"
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@ -216,18 +215,19 @@ static int detect_kbuild_dir(char **kbuild_dir)
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const char *suffix_dir = "";
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char *autoconf_path;
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struct utsname utsname;
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int err;
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if (!test_dir) {
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err = uname(&utsname);
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if (err) {
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pr_warning("uname failed: %s\n", strerror(errno));
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return -EINVAL;
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}
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/* _UTSNAME_LENGTH is 65 */
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char release[128];
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test_dir = utsname.release;
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err = fetch_kernel_version(NULL, release,
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sizeof(release));
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if (err)
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return -EINVAL;
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test_dir = release;
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prefix_dir = "/lib/modules/";
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suffix_dir = "/build";
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}
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@ -325,38 +325,18 @@ get_kbuild_opts(char **kbuild_dir, char **kbuild_include_opts)
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pr_debug("include option is set to %s\n", *kbuild_include_opts);
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}
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static unsigned long
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fetch_kernel_version(void)
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{
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struct utsname utsname;
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int version, patchlevel, sublevel, err;
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if (uname(&utsname))
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return 0;
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err = sscanf(utsname.release, "%d.%d.%d",
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&version, &patchlevel, &sublevel);
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if (err != 3) {
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pr_debug("Unablt to get kernel version from uname '%s'\n",
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utsname.release);
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return 0;
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}
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return (version << 16) + (patchlevel << 8) + sublevel;
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}
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int llvm__compile_bpf(const char *path, void **p_obj_buf,
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size_t *p_obj_buf_sz)
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{
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size_t obj_buf_sz;
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void *obj_buf = NULL;
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int err, nr_cpus_avail;
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char clang_path[PATH_MAX], nr_cpus_avail_str[64];
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unsigned int kernel_version;
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char linux_version_code_str[64];
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const char *clang_opt = llvm_param.clang_opt;
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const char *template = llvm_param.clang_bpf_cmd_template;
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char clang_path[PATH_MAX], nr_cpus_avail_str[64];
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char *kbuild_dir = NULL, *kbuild_include_opts = NULL;
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void *obj_buf = NULL;
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size_t obj_buf_sz;
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const char *template = llvm_param.clang_bpf_cmd_template;
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if (!template)
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template = CLANG_BPF_CMD_DEFAULT_TEMPLATE;
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@ -388,8 +368,11 @@ int llvm__compile_bpf(const char *path, void **p_obj_buf,
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snprintf(nr_cpus_avail_str, sizeof(nr_cpus_avail_str), "%d",
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nr_cpus_avail);
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if (fetch_kernel_version(&kernel_version, NULL, 0))
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kernel_version = 0;
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snprintf(linux_version_code_str, sizeof(linux_version_code_str),
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"0x%lx", fetch_kernel_version());
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"0x%x", kernel_version);
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force_set_env("NR_CPUS", nr_cpus_avail_str);
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force_set_env("LINUX_VERSION_CODE", linux_version_code_str);
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@ -3,6 +3,7 @@
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#include "debug.h"
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#include <api/fs/fs.h>
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#include <sys/mman.h>
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#include <sys/utsname.h>
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#ifdef HAVE_BACKTRACE_SUPPORT
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#include <execinfo.h>
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#endif
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@ -665,3 +666,32 @@ bool find_process(const char *name)
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closedir(dir);
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return ret ? false : true;
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}
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int
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fetch_kernel_version(unsigned int *puint, char *str,
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size_t str_size)
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{
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struct utsname utsname;
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int version, patchlevel, sublevel, err;
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if (uname(&utsname))
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return -1;
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if (str && str_size) {
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strncpy(str, utsname.release, str_size);
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str[str_size - 1] = '\0';
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}
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err = sscanf(utsname.release, "%d.%d.%d",
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&version, &patchlevel, &sublevel);
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if (err != 3) {
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pr_debug("Unablt to get kernel version from uname '%s'\n",
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utsname.release);
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return -1;
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}
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if (puint)
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*puint = (version << 16) + (patchlevel << 8) + sublevel;
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return 0;
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}
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@ -350,4 +350,7 @@ static inline char *asprintf_expr_not_in_ints(const char *var, size_t nints, int
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int get_stack_size(const char *str, unsigned long *_size);
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int fetch_kernel_version(unsigned int *puint,
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char *str, size_t str_sz);
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#endif /* GIT_COMPAT_UTIL_H */
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