diff options
| author | Joonas Lahtinen <joonas.lahtinen@linux.intel.com> | 2018-03-01 11:14:24 +0200 |
|---|---|---|
| committer | Joonas Lahtinen <joonas.lahtinen@linux.intel.com> | 2018-03-01 11:14:24 +0200 |
| commit | bba73071b6f71be0a101658d7c13866e30b264a6 (patch) | |
| tree | 2a0ea1fc5fd975f1c2e9e50de5bb3cb2cb3cb5f7 /include/linux/buffer_head.h | |
| parent | c71b53cc66c5053ff3524a6132f8fc8199d618c3 (diff) | |
| parent | f073d78eeb8efd85718e611c15f9a78647751dea (diff) | |
Merge drm-next into drm-intel-next-queued (this time for real)
To pull in the HDCP changes, especially wait_for changes to drm/i915
that Chris wants to build on top of.
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Diffstat (limited to 'include/linux/buffer_head.h')
| -rw-r--r-- | include/linux/buffer_head.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h index 8b1bf8d3d4a2..894e5d125de6 100644 --- a/include/linux/buffer_head.h +++ b/include/linux/buffer_head.h @@ -81,11 +81,14 @@ struct buffer_head { /* * macro tricks to expand the set_buffer_foo(), clear_buffer_foo() * and buffer_foo() functions. + * To avoid reset buffer flags that are already set, because that causes + * a costly cache line transition, check the flag first. */ #define BUFFER_FNS(bit, name) \ static __always_inline void set_buffer_##name(struct buffer_head *bh) \ { \ - set_bit(BH_##bit, &(bh)->b_state); \ + if (!test_bit(BH_##bit, &(bh)->b_state)) \ + set_bit(BH_##bit, &(bh)->b_state); \ } \ static __always_inline void clear_buffer_##name(struct buffer_head *bh) \ { \ @@ -151,7 +154,6 @@ void buffer_check_dirty_writeback(struct page *page, void mark_buffer_dirty(struct buffer_head *bh); void mark_buffer_write_io_error(struct buffer_head *bh); -void init_buffer(struct buffer_head *, bh_end_io_t *, void *); void touch_buffer(struct buffer_head *bh); void set_bh_page(struct buffer_head *bh, struct page *page, unsigned long offset); |