From: Alexey Dobriyan <adobriyan@xxxxxxxxx> Subject: 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@xxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxx> Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/cpumask.h | 2 +- kernel/compat.c | 2 +- kernel/sched/core.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff -puN include/linux/cpumask.h~cpumask-make-cpumask_size-return-unsigned-int include/linux/cpumask.h --- a/include/linux/cpumask.h~cpumask-make-cpumask_size-return-unsigned-int +++ a/include/linux/cpumask.h @@ -640,7 +640,7 @@ static inline int cpulist_parse(const ch /** * 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 -puN kernel/compat.c~cpumask-make-cpumask_size-return-unsigned-int kernel/compat.c --- a/kernel/compat.c~cpumask-make-cpumask_size-return-unsigned-int +++ a/kernel/compat.c @@ -355,7 +355,7 @@ COMPAT_SYSCALL_DEFINE3(sched_getaffinity 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 -puN kernel/sched/core.c~cpumask-make-cpumask_size-return-unsigned-int kernel/sched/core.c --- a/kernel/sched/core.c~cpumask-make-cpumask_size-return-unsigned-int +++ a/kernel/sched/core.c @@ -4853,7 +4853,7 @@ SYSCALL_DEFINE3(sched_getaffinity, pid_t 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; _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
