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| author | Peter Zijlstra <peterz@infradead.org> | 2016-05-30 16:48:35 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-09-22 15:25:54 +0200 |
| commit | 87709e28dc7c669af1126aa7352ff6f7b035412d (patch) | |
| tree | 64c951adb2bf364a6652517f2f1b6da0943bbbf6 /fs/locks.c | |
| parent | 259d69b7f056bc9a543c7d184e791ef6c2775081 (diff) | |
| download | linux-87709e28dc7c669af1126aa7352ff6f7b035412d.tar.bz2 | |
fs/locks: Use percpu_down_read_preempt_disable()
Avoid spurious preemption.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dave@stgolabs.net
Cc: der.herr@hofr.at
Cc: paulmck@linux.vnet.ibm.com
Cc: riel@redhat.com
Cc: tj@kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'fs/locks.c')
| -rw-r--r-- | fs/locks.c | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/fs/locks.c b/fs/locks.c index c33aa77fada2..133fb2543d21 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -930,7 +930,7 @@ static int flock_lock_inode(struct inode *inode, struct file_lock *request) return -ENOMEM; } - percpu_down_read(&file_rwsem); + percpu_down_read_preempt_disable(&file_rwsem); spin_lock(&ctx->flc_lock); if (request->fl_flags & FL_ACCESS) goto find_conflict; @@ -971,7 +971,7 @@ find_conflict: out: spin_unlock(&ctx->flc_lock); - percpu_up_read(&file_rwsem); + percpu_up_read_preempt_enable(&file_rwsem); if (new_fl) locks_free_lock(new_fl); locks_dispose_list(&dispose); @@ -1008,7 +1008,7 @@ static int posix_lock_inode(struct inode *inode, struct file_lock *request, new_fl2 = locks_alloc_lock(); } - percpu_down_read(&file_rwsem); + percpu_down_read_preempt_disable(&file_rwsem); spin_lock(&ctx->flc_lock); /* * New lock request. Walk all POSIX locks and look for conflicts. If @@ -1180,7 +1180,7 @@ static int posix_lock_inode(struct inode *inode, struct file_lock *request, } out: spin_unlock(&ctx->flc_lock); - percpu_up_read(&file_rwsem); + percpu_up_read_preempt_enable(&file_rwsem); /* * Free any unused locks. */ @@ -1455,7 +1455,7 @@ int __break_lease(struct inode *inode, unsigned int mode, unsigned int type) return error; } - percpu_down_read(&file_rwsem); + percpu_down_read_preempt_disable(&file_rwsem); spin_lock(&ctx->flc_lock); time_out_leases(inode, &dispose); @@ -1507,13 +1507,13 @@ restart: locks_insert_block(fl, new_fl); trace_break_lease_block(inode, new_fl); spin_unlock(&ctx->flc_lock); - percpu_up_read(&file_rwsem); + percpu_up_read_preempt_enable(&file_rwsem); locks_dispose_list(&dispose); error = wait_event_interruptible_timeout(new_fl->fl_wait, !new_fl->fl_next, break_time); - percpu_down_read(&file_rwsem); + percpu_down_read_preempt_disable(&file_rwsem); spin_lock(&ctx->flc_lock); trace_break_lease_unblock(inode, new_fl); locks_delete_block(new_fl); @@ -1530,7 +1530,7 @@ restart: } out: spin_unlock(&ctx->flc_lock); - percpu_up_read(&file_rwsem); + percpu_up_read_preempt_enable(&file_rwsem); locks_dispose_list(&dispose); locks_free_lock(new_fl); return error; @@ -1685,7 +1685,7 @@ generic_add_lease(struct file *filp, long arg, struct file_lock **flp, void **pr return -EINVAL; } - percpu_down_read(&file_rwsem); + percpu_down_read_preempt_disable(&file_rwsem); spin_lock(&ctx->flc_lock); time_out_leases(inode, &dispose); error = check_conflicting_open(dentry, arg, lease->fl_flags); @@ -1756,7 +1756,7 @@ out_setup: lease->fl_lmops->lm_setup(lease, priv); out: spin_unlock(&ctx->flc_lock); - percpu_up_read(&file_rwsem); + percpu_up_read_preempt_enable(&file_rwsem); locks_dispose_list(&dispose); if (is_deleg) inode_unlock(inode); @@ -1779,7 +1779,7 @@ static int generic_delete_lease(struct file *filp, void *owner) return error; } - percpu_down_read(&file_rwsem); + percpu_down_read_preempt_disable(&file_rwsem); spin_lock(&ctx->flc_lock); list_for_each_entry(fl, &ctx->flc_lease, fl_list) { if (fl->fl_file == filp && @@ -1792,7 +1792,7 @@ static int generic_delete_lease(struct file *filp, void *owner) if (victim) error = fl->fl_lmops->lm_change(victim, F_UNLCK, &dispose); spin_unlock(&ctx->flc_lock); - percpu_up_read(&file_rwsem); + percpu_up_read_preempt_enable(&file_rwsem); locks_dispose_list(&dispose); return error; } |