The patch titled
Subject: cpumask: make cpumask_size() return "unsigned int"
has been added to the -mm tree. Its filename is
cpumask-make-cpumask_size-return-unsigned-int.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/cpumask-make-cpumask_size-return-unsigned-int.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/cpumask-make-cpumask_size-return-unsigned-int.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
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
@@ -4799,7 +4799,7 @@ 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;
_
Patches currently in -mm which might be from adobriyan@xxxxxxxxx are
proc-use-%u-for-pid-printing-and-slightly-less-stack.patch
proc-dont-use-read_once-write_once-for-proc-fail-nth.patch
proc-fix-proc-map_files-lookup.patch
proc-simpler-proc-vmcore-cleanup.patch
proc-less-memory-for-proc-map_files-readdir.patch
proc-delete-children_seq_release.patch
seq_file-delete-small-value-optimization.patch
cpumask-make-cpumask_size-return-unsigned-int.patch
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