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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-11-26 19:22:16 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-12-08 22:16:01 +0300 |
| commit | 40dc11ffb35e8c4e8fa71092048e0f8de9db758c (patch) | |
| tree | 88ae143dab98b902b7ec94220160560463c063f9 /Documentation | |
| parent | 806c09a7db457be3758e14b1f152761135d89af5 (diff) | |
| download | linux-40dc11ffb35e8c4e8fa71092048e0f8de9db758c.tar.xz | |
printk: Use this_cpu_{read|write} api on printk_pending
__get_cpu_var() is a bit inefficient, lets use __this_cpu_read() and
__this_cpu_write() to manipulate printk_pending.
printk_needs_cpu(cpu) is called only for the current cpu :
Use faster __this_cpu_read().
Remove the redundant unlikely on (cpu_is_offline(cpu)) test:
# size kernel/printk.o*
text data bss dec hex filename
9942 756 263488 274186 42f0a kernel/printk.o.new
9990 756 263488 274234 42f3a kernel/printk.o.old
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Christoph Lameter <cl@linux.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1290788536.2855.237.camel@edumazet-laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions