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authorAlexey Dobriyan <adobriyan@gmail.com>2017-09-09 02:14:18 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-09 04:26:48 +0300
commit9b130ad5bb8255ee8534d92d67e12b2a4887eacb (patch)
tree125a5e867be6b0dbd4958ca41426e2c733768110 /drivers/base/cpu.c
parentac036f9570a2d318b7d8dbbdbf0e269d7cc68cef (diff)
downloadlinux-9b130ad5bb8255ee8534d92d67e12b2a4887eacb.tar.xz
treewide: make "nr_cpu_ids" unsigned
First, number of CPUs can't be negative number. Second, different signnnedness leads to suboptimal code in the following cases: 1) kmalloc(nr_cpu_ids * sizeof(X)); "int" has to be sign extended to size_t. 2) while (loff_t *pos < nr_cpu_ids) MOVSXD is 1 byte longed than the same MOV. Other cases exist as well. Basically compiler is told that nr_cpu_ids can't be negative which can't be deduced if it is "int". Code savings on allyesconfig kernel: -3KB add/remove: 0/0 grow/shrink: 25/264 up/down: 261/-3631 (-3370) function old new delta coretemp_cpu_online 450 512 +62 rcu_init_one 1234 1272 +38 pci_device_probe 374 399 +25 ... pgdat_reclaimable_pages 628 556 -72 select_fallback_rq 446 369 -77 task_numa_find_cpu 1923 1807 -116 Link: http://lkml.kernel.org/r/20170819114959.GA30580@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/base/cpu.c')
-rw-r--r--drivers/base/cpu.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 2c3b359b3536..321cd7b4d817 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -256,9 +256,9 @@ static ssize_t print_cpus_offline(struct device *dev,
buf[n++] = ',';
if (nr_cpu_ids == total_cpus-1)
- n += snprintf(&buf[n], len - n, "%d", nr_cpu_ids);
+ n += snprintf(&buf[n], len - n, "%u", nr_cpu_ids);
else
- n += snprintf(&buf[n], len - n, "%d-%d",
+ n += snprintf(&buf[n], len - n, "%u-%d",
nr_cpu_ids, total_cpus-1);
}