korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-11 04:18:39 +08:00
Code Issues Packages Projects Releases Wiki Activity

iomap: Use kmap_local_page instead of kmap_atomic

Browse Source 
kmap_atomic() has the side-effect of disabling pagefaults and
preemption.  kmap_local_page() does not do this and is preferred.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-08-04 20:07:33 -07:00 committed by Darrick J. Wong
parent f1f264b4c1
commit ab069d5fdc
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
fs/iomap/buffered-io.c
View File

@ -223,10 +223,10 @@ static int iomap_read_inline_data(struct inode *inode, struct page *page,
if (poff > 0)
iomap_page_create(inode, page);
addr = kmap_atomic(page) + poff;
addr = kmap_local_page(page) + poff;
memcpy(addr, iomap->inline_data, size);
memset(addr + size, 0, PAGE_SIZE - poff - size);
kunmap_atomic(addr);
kunmap_local(addr);
iomap_set_range_uptodate(page, poff, PAGE_SIZE - poff);
return PAGE_SIZE - poff;
}
@ -682,9 +682,9 @@ static size_t iomap_write_end_inline(struct inode *inode, struct page *page,
BUG_ON(!iomap_inline_data_valid(iomap));
flush_dcache_page(page);
addr = kmap_atomic(page);
memcpy(iomap_inline_data(iomap, pos), addr + pos, copied);
kunmap_atomic(addr);
addr = kmap_local_page(page) + pos;
memcpy(iomap_inline_data(iomap, pos), addr, copied);
kunmap_local(addr);
mark_inode_dirty(inode);
return copied;