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[ Upstream commit 448b5a1548d87c246c3d0c3df8480d3c6eb6c11a ]
Currently, vmap()s are avoided if physical addresses are
consecutive for decompressed buffers.
I observed that is very common for 4KiB pclusters since the
numbers of decompressed pages are almost 2 or 3.
However, such detection doesn't work for Highmem pages on
32-bit machines, let's fix it now.
Reported-by: Liu Jinbao <liujinbao1@xiaomi.com>
Fixes: 7fc45dbc938a ("staging: erofs: introduce generic decompression backend")
Link: https://lore.kernel.org/r/20220708101001.21242-1-hsiangkao@linux.alibaba.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
0ca556256f