buffer: remove useless comment and WB_REASON_FREE_MORE_MEM, reason.

free_more_memory func has been completely removed in commit bc48f001de12
("buffer: eliminate the need to call free_more_memory() in __getblk_slow()")

So comment and `WB_REASON_FREE_MORE_MEM` reason about free_more_memory
are no longer needed.

Fixes: bc48f001de12 ("buffer: eliminate the need to call free_more_memory() in __getblk_slow()")
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Zhiqiang Liu <liuzhiqiang26@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/buffer.c b/fs/buffer.c
index f73276d..763de99 100644 (file)
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -967,7 +967,7 @@ grow_dev_page(struct block_device *bdev, sector_t block,
        struct page *page;
        struct buffer_head *bh;
        sector_t end_block;
-       int ret = 0;            /* Will call free_more_memory() */
+       int ret = 0;
        gfp_t gfp_mask;
 
        gfp_mask = mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS) | gfp;

diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h
index 4fc87de..ee577a8 100644 (file)
--- a/include/linux/backing-dev-defs.h
+++ b/include/linux/backing-dev-defs.h
@@ -54,7 +54,6 @@ enum wb_reason {
        WB_REASON_SYNC,
        WB_REASON_PERIODIC,
        WB_REASON_LAPTOP_TIMER,
-       WB_REASON_FREE_MORE_MEM,
        WB_REASON_FS_FREE_SPACE,
        /*
         * There is no bdi forker thread any more and works are done

diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
index d94def2..85a33be 100644 (file)
--- a/include/trace/events/writeback.h
+++ b/include/trace/events/writeback.h
@@ -36,7 +36,6 @@
        EM( WB_REASON_SYNC,                     "sync")                 \
        EM( WB_REASON_PERIODIC,                 "periodic")             \
        EM( WB_REASON_LAPTOP_TIMER,             "laptop_timer")         \
-       EM( WB_REASON_FREE_MORE_MEM,            "free_more_memory")     \
        EM( WB_REASON_FS_FREE_SPACE,            "fs_free_space")        \
        EMe(WB_REASON_FORKER_THREAD,            "forker_thread")