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kernel/profile.c: simplify duplicated code in profile_setup() 

The code to parse option string "schedule/sleep/kvm" of cmdline in
function profile_setup is redundant, so simplify that.

Link: https://lkml.kernel.org/r/20220901003121.53597-1-wuchi.zero@gmail.com
Signed-off-by: wuchi <wuchi.zero@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foudation.org>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
wuchi 2022-09-01 08:31:21 +08:00 committed by Andrew Morton
parent 63095f4f3a
commit 35783ccbe5
1 changed files with 14 additions and 18 deletions
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32
kernel/profile.c
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@ -59,43 +59,39 @@ int profile_setup(char *str)
static const char schedstr[] = "schedule";
static const char sleepstr[] = "sleep";
static const char kvmstr[] = "kvm";
const char *select = NULL;
int par;
if (!strncmp(str, sleepstr, strlen(sleepstr))) {
#ifdef CONFIG_SCHEDSTATS
force_schedstat_enabled();
prof_on = SLEEP_PROFILING;
if (str[strlen(sleepstr)] == ',')
str += strlen(sleepstr) + 1;
if (get_option(&str, &par))
prof_shift = clamp(par, 0, BITS_PER_LONG - 1);
pr_info("kernel sleep profiling enabled (shift: %u)\n",
prof_shift);
select = sleepstr;
#else
pr_warn("kernel sleep profiling requires CONFIG_SCHEDSTATS\n");
#endif /* CONFIG_SCHEDSTATS */
} else if (!strncmp(str, schedstr, strlen(schedstr))) {
prof_on = SCHED_PROFILING;
if (str[strlen(schedstr)] == ',')
str += strlen(schedstr) + 1;
if (get_option(&str, &par))
prof_shift = clamp(par, 0, BITS_PER_LONG - 1);
pr_info("kernel schedule profiling enabled (shift: %u)\n",
prof_shift);
select = schedstr;
} else if (!strncmp(str, kvmstr, strlen(kvmstr))) {
prof_on = KVM_PROFILING;
if (str[strlen(kvmstr)] == ',')
str += strlen(kvmstr) + 1;
if (get_option(&str, &par))
prof_shift = clamp(par, 0, BITS_PER_LONG - 1);
pr_info("kernel KVM profiling enabled (shift: %u)\n",
prof_shift);
select = kvmstr;
} else if (get_option(&str, &par)) {
prof_shift = clamp(par, 0, BITS_PER_LONG - 1);
prof_on = CPU_PROFILING;
pr_info("kernel profiling enabled (shift: %u)\n",
prof_shift);
}
if (select) {
if (str[strlen(select)] == ',')
str += strlen(select) + 1;
if (get_option(&str, &par))
prof_shift = clamp(par, 0, BITS_PER_LONG - 1);
pr_info("kernel %s profiling enabled (shift: %u)\n",
select, prof_shift);
}
return 1;
}
__setup("profile=", profile_setup);