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author | Christoph Lameter <cl@linux.com> | 2010-12-08 16:22:55 +0100 |
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committer | Tejun Heo <tj@kernel.org> | 2010-12-17 15:07:19 +0100 |
commit | 909ea96468096b07fbb41aaf69be060d92bd9271 (patch) | |
tree | a7e015edd96b5f674874fe78cdd889769e130a2a /kernel/exit.c | |
parent | 780f36d8b3fa9572f731d4fb85067b2e45e6f993 (diff) | |
download | kernel_samsung_espresso10-909ea96468096b07fbb41aaf69be060d92bd9271.zip kernel_samsung_espresso10-909ea96468096b07fbb41aaf69be060d92bd9271.tar.gz kernel_samsung_espresso10-909ea96468096b07fbb41aaf69be060d92bd9271.tar.bz2 |
core: Replace __get_cpu_var with __this_cpu_read if not used for an address.
__get_cpu_var() can be replaced with this_cpu_read and will then use a
single read instruction with implied address calculation to access the
correct per cpu instance.
However, the address of a per cpu variable passed to __this_cpu_read()
cannot be determined (since it's an implied address conversion through
segment prefixes). Therefore apply this only to uses of __get_cpu_var
where the address of the variable is not used.
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Hugh Dickins <hughd@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/exit.c')
-rw-r--r-- | kernel/exit.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index 676149a..89c7486 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -69,7 +69,7 @@ static void __unhash_process(struct task_struct *p, bool group_dead) list_del_rcu(&p->tasks); list_del_init(&p->sibling); - __get_cpu_var(process_counts)--; + __this_cpu_dec(process_counts); } list_del_rcu(&p->thread_group); } |