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| author | Arnd Bergmann <arnd@arndb.de> | 2011-10-20 15:17:34 +0200 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2011-10-20 15:17:34 +0200 |
| commit | a32750c2ca6f697903b19063fc86f4272865e3a1 (patch) | |
| tree | 57a23806c5358855eb426c006c88943afa683b1b /block/blk-softirq.c | |
| parent | 318007e9001349db9b4fcd49e9e79a7636dba7a9 (diff) | |
| parent | d870ea1d6bc5057f2599416655b42ab192dae6d0 (diff) | |
| download | linux-stable-a32750c2ca6f697903b19063fc86f4272865e3a1.tar.gz linux-stable-a32750c2ca6f697903b19063fc86f4272865e3a1.tar.bz2 linux-stable-a32750c2ca6f697903b19063fc86f4272865e3a1.zip | |
Merge branches 'imx/pata' and 'imx/sata' into next/driver
Conflicts:
arch/arm/mach-mx5/clock-mx51-mx53.c
arch/arm/mach-mx5/devices-imx53.h
Diffstat (limited to 'block/blk-softirq.c')
| -rw-r--r-- | block/blk-softirq.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/block/blk-softirq.c b/block/blk-softirq.c index 475fab809a80..58340d0cb23a 100644 --- a/block/blk-softirq.c +++ b/block/blk-softirq.c @@ -124,6 +124,14 @@ void __blk_complete_request(struct request *req) } else ccpu = cpu; + /* + * If current CPU and requested CPU are in the same group, running + * softirq in current CPU. One might concern this is just like + * QUEUE_FLAG_SAME_FORCE, but actually not. blk_complete_request() is + * running in interrupt handler, and currently I/O controller doesn't + * support multiple interrupts, so current CPU is unique actually. This + * avoids IPI sending from current CPU to the first CPU of a group. + */ if (ccpu == cpu || ccpu == group_cpu) { struct list_head *list; do_local: |