]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
mm: remove redundant compound_head() calling
authorMuchun Song <songmuchun@bytedance.com>
Wed, 8 Sep 2021 02:55:55 +0000 (19:55 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 8 Sep 2021 18:50:23 +0000 (11:50 -0700)
commitfe3df441ef885a75a3eff5e151ead1a92266d222
tree9e1d1e5c4b1851cb9c825adef186380161b7638a
parent5ef5f810199f421cb6455aa018fb8f21151b4a16
mm: remove redundant compound_head() calling

There is a READ_ONCE() in the macro of compound_head(), which will prevent
compiler from optimizing the code when there are more than once calling of
it in a function.  Remove the redundant calling of compound_head() from
page_to_index() and page_add_file_rmap() for better code generation.

Link: https://lkml.kernel.org/r/20210811101431.83940-1-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: David Howells <dhowells@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: William Kucharski <william.kucharski@oracle.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/pagemap.h
mm/rmap.c