kmap_atomic() is deprecated in favor of kmap_local_{folio,page}(). Therefore, replace kmap_atomic() with kmap_local_page() in gfs2_internal_read() and stuffed_readpage().
kmap_atomic() disables page-faults and preemption (the latter only for !PREEMPT_RT kernels), However, the code within the mapping/un-mapping in gfs2_internal_read() and stuffed_readpage() does not depend on the above-mentioned side effects. Therefore, a mere replacement of the old API with the new one is all that is required (i.e., there is no need to explicitly add any calls to pagefault_disable() and/or preempt_disable()). Signed-off-by: Deepak R Varma <d...@mailo.com> --- Note: The Patch is build tested only. I will be happy to run recommended testing with some guidance if required. Changes in v2: - Update patch description to correct the replacement function name from kmap_local_folio to kmap_local _page fs/gfs2/aops.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c index 3b41542d6697..7bd92054d353 100644 --- a/fs/gfs2/aops.c +++ b/fs/gfs2/aops.c @@ -432,10 +432,10 @@ static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) if (error) return error; - kaddr = kmap_atomic(page); + kaddr = kmap_local_page(page); memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize); memset(kaddr + dsize, 0, PAGE_SIZE - dsize); - kunmap_atomic(kaddr); + kunmap_local(kaddr); flush_dcache_page(page); brelse(dibh); SetPageUptodate(page); @@ -498,12 +498,12 @@ int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos, continue; return PTR_ERR(page); } - p = kmap_atomic(page); + p = kmap_local_page(page); amt = size - copied; if (offset + size > PAGE_SIZE) amt = PAGE_SIZE - offset; memcpy(buf + copied, p + offset, amt); - kunmap_atomic(p); + kunmap_local(p); put_page(page); copied += amt; index++; -- 2.34.1