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sys_linux: add function for checking kernel version

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This commit is contained in:
Miroslav Lichvar 2016-10-26 10:24:49 +02:00
parent 19fde8f49c
commit a8c6bea2d5
2 changed files with 31 additions and 10 deletions
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39
sys_linux.c
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@ -271,6 +271,22 @@ kernelvercmp(int major1, int minor1, int patch1,
}
/* ================================================== */
static void
get_kernel_version(int *major, int *minor, int *patch)
{
struct utsname uts;
if (uname(&uts) < 0)
LOG_FATAL(LOGF_SysLinux, "uname() failed");
*patch = 0;
if (sscanf(uts.release, "%d.%d.%d", major, minor, patch) < 2)
LOG_FATAL(LOGF_SysLinux, "Could not parse kernel version");
}
/* ================================================== */
/* Compute the scaling to use on any frequency we set, according to
the vintage of the Linux kernel being used. */
@ -278,7 +294,6 @@ static void
get_version_specific_details(void)
{
int major, minor, patch;
struct utsname uts;
hz = get_hz();
@ -293,15 +308,7 @@ get_version_specific_details(void)
(CONFIG_NO_HZ aka tickless), assume the lowest commonly used fixed rate */
tick_update_hz = 100;
if (uname(&uts) < 0) {
LOG_FATAL(LOGF_SysLinux, "Cannot uname(2) to get kernel version, sorry.");
}
patch = 0;
if (sscanf(uts.release, "%d.%d.%d", &major, &minor, &patch) < 2) {
LOG_FATAL(LOGF_SysLinux, "Cannot read information from uname, sorry");
}
get_kernel_version(&major, &minor, &patch);
DEBUG_LOG(LOGF_SysLinux, "Linux kernel major=%d minor=%d patch=%d", major, minor, patch);
if (kernelvercmp(major, minor, patch, 2, 2, 0) < 0) {
@ -633,3 +640,15 @@ void SYS_Linux_MemLockAll(int LockAll)
}
}
#endif /* HAVE_MLOCKALL */
/* ================================================== */
int
SYS_Linux_CheckKernelVersion(int req_major, int req_minor)
{
int major, minor, patch;
get_kernel_version(&major, &minor, &patch);
return kernelvercmp(req_major, req_minor, 0, major, minor, patch) <= 0;
}

2
sys_linux.h
View file

@ -39,4 +39,6 @@ extern void SYS_Linux_MemLockAll(int LockAll);
extern void SYS_Linux_SetScheduler(int SchedPriority);
extern int SYS_Linux_CheckKernelVersion(int req_major, int req_minor);
#endif /* GOT_SYS_LINUX_H */