Commit 7a405079 authored Oct 16, 2007 by Nick Piggin Committed by Linus Torvalds Oct 17, 2007

mm: document tree_lock->zone.lock lockorder

zone->lock is quite an "inner" lock and mostly constrained to page alloc as
well, so like slab locks, it probably isn't something that is critically
important to document here. However unlike slab locks, zone lock could be
used more widely in future, and page_alloc.c might possibly have more
business to do tricky things with pagecache than does slab. So... I don't
think it hurts to document it.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent d773ed6b

mm/filemap.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -63,6 +63,7 @@ generic_file_direct_IO(int rw, struct kiocb iocb, const struct iovec iov,
		* ->private_lock (__free_pte->__set_page_dirty_buffers)
		* ->swap_lock (exclusive_swap_page, others)
		* ->mapping->tree_lock
		* ->zone.lock
		*
		* ->i_mutex
		* ->i_mmap_lock (truncate->unmap_mapping_range)

mm/rmap.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -36,6 +36,7 @@
		* mapping->tree_lock (widely used, in set_page_dirty,
		* in arch-dependent flush_dcache_mmap_lock,
		* within inode_lock in __sync_single_inode)
		* zone->lock (within radix tree node alloc)
		*/

		#include <linux/mm.h>