From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <20070803125235.885272000@chello.nl> References: <20070803123712.987126000@chello.nl> Date: Fri, 03 Aug 2007 14:37:22 +0200 From: Peter Zijlstra Subject: [PATCH 09/23] lib: percpu_counter_init_irq Content-Disposition: inline; filename=percpu_counter_init_irq.patch Sender: owner-linux-mm@kvack.org Return-Path: To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: miklos@szeredi.hu, akpm@linux-foundation.org, neilb@suse.de, dgc@sgi.com, tomoki.sekiyama.qu@hitachi.com, a.p.zijlstra@chello.nl, nikita@clusterfs.com, trond.myklebust@fys.uio.no, yingchao.zhou@gmail.com, richard@rsk.demon.co.uk, torvalds@linux-foundation.org List-ID: provide a way to init percpu_counters that are supposed to be used from irq safe contexts. Signed-off-by: Peter Zijlstra --- include/linux/percpu_counter.h | 3 +++ lib/percpu_counter.c | 12 ++++++++++++ 2 files changed, 15 insertions(+) Index: linux-2.6/include/linux/percpu_counter.h =================================================================== --- linux-2.6.orig/include/linux/percpu_counter.h +++ linux-2.6/include/linux/percpu_counter.h @@ -31,6 +31,7 @@ struct percpu_counter { #endif int percpu_counter_init(struct percpu_counter *fbc, s64 amount); +int percpu_counter_init_irq(struct percpu_counter *fbc, s64 amount); void percpu_counter_destroy(struct percpu_counter *fbc); void percpu_counter_set(struct percpu_counter *fbc, s64 amount); void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch); @@ -84,6 +85,8 @@ static inline int percpu_counter_init(st return 0; } +#define percpu_counter_init_irq percpu_counter_init + static inline void percpu_counter_destroy(struct percpu_counter *fbc) { } Index: linux-2.6/lib/percpu_counter.c =================================================================== --- linux-2.6.orig/lib/percpu_counter.c +++ linux-2.6/lib/percpu_counter.c @@ -68,6 +68,8 @@ s64 __percpu_counter_sum(struct percpu_c } EXPORT_SYMBOL(__percpu_counter_sum); +static struct lock_class_key percpu_counter_irqsafe; + int percpu_counter_init(struct percpu_counter *fbc, s64 amount) { spin_lock_init(&fbc->lock); @@ -84,6 +86,16 @@ int percpu_counter_init(struct percpu_co } EXPORT_SYMBOL(percpu_counter_init); +int percpu_counter_init_irq(struct percpu_counter *fbc, s64 amount) +{ + int err; + + err = percpu_counter_init(fbc, amount); + if (!err) + lockdep_set_class(&fbc->lock, &percpu_counter_irqsafe); + return err; +} + void percpu_counter_destroy(struct percpu_counter *fbc) { if (!fbc->counters) -- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org