From: Ira Weiny <ira.weiny@xxxxxxxxx> Use a simple coccinelle script to help convert the most common kmap()/kunmap() patterns to kmap_local_page()/kunmap_local(). Note that some kmaps which were caught by this script needed to be handled by hand because of the strict unmapping order of kunmap_local() so they are not included in this patch. But this script got us started. The development of this patch was aided by the follow script: // <smpl> // SPDX-License-Identifier: GPL-2.0-only // Find kmap and replace with kmap_local_page then mark kunmap // // Confidence: Low // Copyright: (C) 2021 Intel Corporation // URL: http://coccinelle.lip6.fr/ @ catch_all @ expression e, e2; @@ ( -kmap(e) +kmap_local_page(e) ) ... ( -kunmap(...) +kunmap_local() ) // </smpl> Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx> --- fs/btrfs/compression.c | 4 ++-- fs/btrfs/inode.c | 4 ++-- fs/btrfs/lzo.c | 9 ++++----- fs/btrfs/raid56.c | 4 ++-- 4 files changed, 10 insertions(+), 11 deletions(-) diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c index a219dcdb749e..21833a2fe8c6 100644 --- a/fs/btrfs/compression.c +++ b/fs/btrfs/compression.c @@ -1578,7 +1578,7 @@ static void heuristic_collect_sample(struct inode *inode, u64 start, u64 end, curr_sample_pos = 0; while (index < index_end) { page = find_get_page(inode->i_mapping, index); - in_data = kmap(page); + in_data = kmap_local_page(page); /* Handle case where the start is not aligned to PAGE_SIZE */ i = start % PAGE_SIZE; while (i < PAGE_SIZE - SAMPLING_READ_SIZE) { @@ -1591,7 +1591,7 @@ static void heuristic_collect_sample(struct inode *inode, u64 start, u64 end, start += SAMPLING_INTERVAL; curr_sample_pos += SAMPLING_READ_SIZE; } - kunmap(page); + kunmap_local(in_data); put_page(page); index++; diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 641f21a11722..66c6f1185de2 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -6845,7 +6845,7 @@ struct extent_map *btrfs_get_extent(struct btrfs_inode *inode, if (ret) goto out; } else { - map = kmap(page); + map = kmap_local_page(page); read_extent_buffer(leaf, map + pg_offset, ptr, copy_size); if (pg_offset + copy_size < PAGE_SIZE) { @@ -6853,7 +6853,7 @@ struct extent_map *btrfs_get_extent(struct btrfs_inode *inode, PAGE_SIZE - pg_offset - copy_size); } - kunmap(page); + kunmap_local(map); } flush_dcache_page(page); } diff --git a/fs/btrfs/lzo.c b/fs/btrfs/lzo.c index 9084a950dc09..cd042c7567a4 100644 --- a/fs/btrfs/lzo.c +++ b/fs/btrfs/lzo.c @@ -118,7 +118,7 @@ int lzo_compress_pages(struct list_head *ws, struct address_space *mapping, struct workspace *workspace = list_entry(ws, struct workspace, list); int ret = 0; char *data_in; - char *cpage_out; + char *cpage_out, *sizes_ptr; int nr_pages = 0; struct page *in_page = NULL; struct page *out_page = NULL; @@ -258,10 +258,9 @@ int lzo_compress_pages(struct list_head *ws, struct address_space *mapping, } /* store the size of all chunks of compressed data */ - cpage_out = kmap(pages[0]); - write_compress_length(cpage_out, tot_out); - - kunmap(pages[0]); + sizes_ptr = kmap_local_page(pages[0]); + write_compress_length(sizes_ptr, tot_out); + kunmap_local(sizes_ptr); ret = 0; *total_out = tot_out; diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c index 7c3f6dc918c1..9759fb31b73e 100644 --- a/fs/btrfs/raid56.c +++ b/fs/btrfs/raid56.c @@ -2391,13 +2391,13 @@ static noinline void finish_parity_scrub(struct btrfs_raid_bio *rbio, /* Check scrubbing parity and repair it */ p = rbio_stripe_page(rbio, rbio->scrubp, pagenr); - parity = kmap(p); + parity = kmap_local_page(p); if (memcmp(parity, pointers[rbio->scrubp], PAGE_SIZE)) copy_page(parity, pointers[rbio->scrubp]); else /* Parity is right, needn't writeback */ bitmap_clear(rbio->dbitmap, pagenr, 1); - kunmap(p); + kunmap_local(parity); for (stripe = 0; stripe < nr_data; stripe++) kunmap(page_in_rbio(rbio, stripe, pagenr, 0)); -- 2.28.0.rc0.12.gb6a658bd00c9
