The datatype __kernel_time_t is u32 on 32bit platform,
it will easily get overflow, so force u64 conversion.
Currently the following function will be affected:
1. setitimer()
2. timer_create/timer_settime()
3. sys_clock_nanosleep
And this will occur on MIPS32 and ARM32 with "Full dynticks CPU
time accounting" enabled, which is required for CONFIG_NO_HZ_FULL.
Signed-off-by: zengtao <prime.z...@huawei.com>
---
include/asm-generic/cputime_nsecs.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/include/asm-generic/cputime_nsecs.h
b/include/asm-generic/cputime_nsecs.h
index 0419485..0f1c6f3 100644
--- a/include/asm-generic/cputime_nsecs.h
+++ b/include/asm-generic/cputime_nsecs.h
@@ -75,7 +75,7 @@ typedef u64 __nocast cputime64_t;
*/
static inline cputime_t timespec_to_cputime(const struct timespec *val)
{
- u64 ret = val->tv_sec * NSEC_PER_SEC + val->tv_nsec;
+ u64 ret = (u64)val->tv_sec * NSEC_PER_SEC + val->tv_nsec;
return (__force cputime_t) ret;
}
static inline void cputime_to_timespec(const cputime_t ct, struct timespec
*val)
@@ -91,7 +91,8 @@ static inline void cputime_to_timespec(const cputime_t ct,
struct timespec *val)
*/
static inline cputime_t timeval_to_cputime(const struct timeval *val)
{
- u64 ret = val->tv_sec * NSEC_PER_SEC + val->tv_usec * NSEC_PER_USEC;
+ u64 ret = (u64)val->tv_sec * NSEC_PER_SEC +
+ val->tv_usec * NSEC_PER_USEC;
return (__force cputime_t) ret;
}
static inline void cputime_to_timeval(const cputime_t ct, struct timeval *val)
--
1.9.1
