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Subject[PATCH] profile: simplify redundant code in profile_setup
Date
The code to parse option string "schedule/sleep/kvm" of cmdline in
function profile_setup is redundant, so simplify that.

Signed-off-by: wuchi <wuchi.zero@gmail.com>
---
kernel/profile.c | 32 ++++++++++++++------------------
1 file changed, 14 insertions(+), 18 deletions(-)

diff --git a/kernel/profile.c b/kernel/profile.c
index 7ea01ba30e75..8a77769bc4b4 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -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);
--
2.20.1
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