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-rw-r--r--kernel/profile.c21
1 files changed, 11 insertions, 10 deletions
diff --git a/kernel/profile.c b/kernel/profile.c
index c2ebddb5e974..eb9c7f0f5ac5 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -41,7 +41,8 @@ struct profile_hit {
#define NR_PROFILE_GRP (NR_PROFILE_HIT/PROFILE_GRPSZ)
static atomic_t *prof_buffer;
-static unsigned long prof_len, prof_shift;
+static unsigned long prof_len;
+static unsigned short int prof_shift;
int prof_on __read_mostly;
EXPORT_SYMBOL_GPL(prof_on);
@@ -67,8 +68,8 @@ int profile_setup(char *str)
if (str[strlen(sleepstr)] == ',')
str += strlen(sleepstr) + 1;
if (get_option(&str, &par))
- prof_shift = par;
- pr_info("kernel sleep profiling enabled (shift: %ld)\n",
+ prof_shift = clamp(par, 0, BITS_PER_LONG - 1);
+ pr_info("kernel sleep profiling enabled (shift: %u)\n",
prof_shift);
#else
pr_warn("kernel sleep profiling requires CONFIG_SCHEDSTATS\n");
@@ -78,21 +79,21 @@ int profile_setup(char *str)
if (str[strlen(schedstr)] == ',')
str += strlen(schedstr) + 1;
if (get_option(&str, &par))
- prof_shift = par;
- pr_info("kernel schedule profiling enabled (shift: %ld)\n",
+ prof_shift = clamp(par, 0, BITS_PER_LONG - 1);
+ pr_info("kernel schedule profiling enabled (shift: %u)\n",
prof_shift);
} 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 = par;
- pr_info("kernel KVM profiling enabled (shift: %ld)\n",
+ prof_shift = clamp(par, 0, BITS_PER_LONG - 1);
+ pr_info("kernel KVM profiling enabled (shift: %u)\n",
prof_shift);
} else if (get_option(&str, &par)) {
- prof_shift = par;
+ prof_shift = clamp(par, 0, BITS_PER_LONG - 1);
prof_on = CPU_PROFILING;
- pr_info("kernel profiling enabled (shift: %ld)\n",
+ pr_info("kernel profiling enabled (shift: %u)\n",
prof_shift);
}
return 1;
@@ -468,7 +469,7 @@ read_profile(struct file *file, char __user *buf, size_t count, loff_t *ppos)
unsigned long p = *ppos;
ssize_t read;
char *pnt;
- unsigned int sample_step = 1 << prof_shift;
+ unsigned long sample_step = 1UL << prof_shift;
profile_flip_buffers();
if (p >= (prof_len+1)*sizeof(unsigned int))