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| author |   Johannes Thumshirn <johannes.thumshirn@wdc.com> | 2020-02-14 00:24:30 +0900 |
|---|---|---|
| committer |   David Sterba <dsterba@suse.com> | 2020-03-23 17:01:39 +0100 |
| commit | c514c9b10bc1ec8b487e82900ab57f46a21956d9 (patch) | |
| tree | e4c6df21f5fd425c0d86a9599837aa4654db066a /tools/perf/scripts/python/exported-sql-viewer.py | |
| parent | btrfs: Export btrfs_release_disk_super (diff) | |
| download | linux-dev-c514c9b10bc1ec8b487e82900ab57f46a21956d9.tar.xz linux-dev-c514c9b10bc1ec8b487e82900ab57f46a21956d9.zip | |
btrfs: don't kmap() pages from block devices
Block device mappings are never in highmem so kmap() / kunmap() calls for
pages from block devices are unneeded. Use page_address() instead of
kmap() to get to the virtual addreses.
While we're at it, read_cache_page_gfp() doesn't return NULL on error,
only an ERR_PTR, so use IS_ERR() to check for errors.
Suggested-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'tools/perf/scripts/python/exported-sql-viewer.py')
0 files changed, 0 insertions, 0 deletions