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| author | Alexey Dobriyan <adobriyan@gmail.com> | 2017-09-09 01:14:18 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-09 03:26:48 +0200 |
| commit | 9b130ad5bb8255ee8534d92d67e12b2a4887eacb (patch) | |
| tree | 125a5e867be6b0dbd4958ca41426e2c733768110 /arch/x86/kernel/apic/apic.c | |
| parent | vga: optimise console scrolling (diff) | |
| download | linux-9b130ad5bb8255ee8534d92d67e12b2a4887eacb.tar.xz linux-9b130ad5bb8255ee8534d92d67e12b2a4887eacb.zip | |
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 'arch/x86/kernel/apic/apic.c')
| -rw-r--r-- | arch/x86/kernel/apic/apic.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index 7834f73efbf1..8315e2f517a7 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -2097,7 +2097,7 @@ static int allocate_logical_cpuid(int apicid) /* Allocate a new cpuid. */ if (nr_logical_cpuids >= nr_cpu_ids) { - WARN_ONCE(1, "APIC: NR_CPUS/possible_cpus limit of %i reached. " + WARN_ONCE(1, "APIC: NR_CPUS/possible_cpus limit of %u reached. " "Processor %d/0x%x and the rest are ignored.\n", nr_cpu_ids, nr_logical_cpuids, apicid); return -EINVAL; |