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| author | Alexey Dobriyan <adobriyan@gmail.com> | 2018-02-06 15:39:37 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-02-06 18:32:45 -0800 |
| commit | 4de373a12f3c551f9263f37d609f264b440adfec (patch) | |
| tree | b7d06e3340b02a1aa204f7fdae8a08e403265d28 | |
| parent | 667b60946ef9b8375085c7b225229923c6f87308 (diff) | |
| download | op-kernel-dev-4de373a12f3c551f9263f37d609f264b440adfec.zip op-kernel-dev-4de373a12f3c551f9263f37d609f264b440adfec.tar.gz | |
cpumask: make cpumask_size() return "unsigned int"
CPUmasks are never big enough to warrant 64-bit code.
Space savings:
add/remove: 0/0 grow/shrink: 1/4 up/down: 3/-17 (-14)
Function old new delta
sched_init_numa 1530 1533 +3
compat_sys_sched_setaffinity 160 159 -1
sys_sched_getaffinity 197 195 -2
sys_sched_setaffinity 183 176 -7
compat_sys_sched_getaffinity 179 172 -7
Link: http://lkml.kernel.org/r/20171204165531.GA8221@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/linux/cpumask.h | 2 | ||||
| -rw-r--r-- | kernel/compat.c | 2 | ||||
| -rw-r--r-- | kernel/sched/core.c | 2 |
3 files changed, 3 insertions, 3 deletions
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h index 75b5651..d4a2a7d 100644 --- a/include/linux/cpumask.h +++ b/include/linux/cpumask.h @@ -640,7 +640,7 @@ static inline int cpulist_parse(const char *buf, struct cpumask *dstp) /** * cpumask_size - size to allocate for a 'struct cpumask' in bytes */ -static inline size_t cpumask_size(void) +static inline unsigned int cpumask_size(void) { return BITS_TO_LONGS(nr_cpumask_bits) * sizeof(long); } diff --git a/kernel/compat.c b/kernel/compat.c index d1cee65..3247fe7 100644 --- a/kernel/compat.c +++ b/kernel/compat.c @@ -355,7 +355,7 @@ COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len, ret = sched_getaffinity(pid, mask); if (ret == 0) { - size_t retlen = min_t(size_t, len, cpumask_size()); + unsigned int retlen = min(len, cpumask_size()); if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8)) ret = -EFAULT; diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 3da7a24..d99fb5b 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -4853,7 +4853,7 @@ SYSCALL_DEFINE3(sched_getaffinity, pid_t, pid, unsigned int, len, ret = sched_getaffinity(pid, mask); if (ret == 0) { - size_t retlen = min_t(size_t, len, cpumask_size()); + unsigned int retlen = min(len, cpumask_size()); if (copy_to_user(user_mask_ptr, mask, retlen)) ret = -EFAULT; |
