fs/aio.c: eliminate redundant loads in put_aio_ring_file
Using a local variable we can prevent gcc from reloading aio_ring_file->f_inode->i_mapping twice, eliminating 2x2 dependent loads. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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9
fs/aio.c
9
fs/aio.c
@ -274,14 +274,17 @@ __initcall(aio_setup);
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static void put_aio_ring_file(struct kioctx *ctx)
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static void put_aio_ring_file(struct kioctx *ctx)
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{
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{
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struct file *aio_ring_file = ctx->aio_ring_file;
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struct file *aio_ring_file = ctx->aio_ring_file;
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struct address_space *i_mapping;
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if (aio_ring_file) {
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if (aio_ring_file) {
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truncate_setsize(aio_ring_file->f_inode, 0);
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truncate_setsize(aio_ring_file->f_inode, 0);
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/* Prevent further access to the kioctx from migratepages */
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/* Prevent further access to the kioctx from migratepages */
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spin_lock(&aio_ring_file->f_inode->i_mapping->private_lock);
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i_mapping = aio_ring_file->f_inode->i_mapping;
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aio_ring_file->f_inode->i_mapping->private_data = NULL;
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spin_lock(&i_mapping->private_lock);
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i_mapping->private_data = NULL;
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ctx->aio_ring_file = NULL;
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ctx->aio_ring_file = NULL;
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spin_unlock(&aio_ring_file->f_inode->i_mapping->private_lock);
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spin_unlock(&i_mapping->private_lock);
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fput(aio_ring_file);
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fput(aio_ring_file);
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}
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}
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