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authorJohn Stultz <johnstul@us.ibm.com>2010-02-22 16:48:26 -0800
committerThomas Gleixner <tglx@linutronix.de>2010-04-27 17:32:58 +0200
commit23695896abe0d1c813c2c88f0dd165d435d08689 (patch)
treebc676786565c37a9dce4a8ca07d0a393e753f43c /mm/swapfile.c
parent3f2ef0d48b33d3423f99077a6efd6f4eea3ac090 (diff)
downloadlwn-23695896abe0d1c813c2c88f0dd165d435d08689.tar.gz
lwn-23695896abe0d1c813c2c88f0dd165d435d08689.zip
Fix vfsmount_read_lock to work with -rt
Because vfsmount_read_lock aquires the vfsmount spinlock for the current cpu, it causes problems wiht -rt, as you might migrate between cpus between a lock and unlock. This patch fixes the issue by having the caller pick a cpu, then consistently use that cpu between the lock and unlock. We may migrate inbetween lock and unlock, but that's ok because we're not doing anything cpu specific, other then avoiding contention on the read side across the cpus. Its not pretty, but it works and statistically shouldn't hurt performance. Signed-off-by: John Stultz <johnstul@us.ibm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'mm/swapfile.c')
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