[PATCH 04/13] iomap: drop the obsolete PF_MEMALLOC check in iomap_do_writepage

Christoph Hellwig
2023-11-26T12:47:43Z

The iomap writepage implementation has been removed in commit
478af190cb6c ("iomap: remove iomap_writepage") and this code is now only
called through ->writepages which never happens from memory reclaim.
Remove the canary in the coal mine now that the coal mine has been shut
down.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/iomap/buffered-io.c | 16 ----------------
1 file changed, 16 deletions(-)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index b28c57f8603303..8148e4c9765dac 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1910,20 +1910,6 @@ static int iomap_do_writepage(struct folio *folio,

trace_iomap_writepage(inode, folio_pos(folio), folio_size(folio));

- /*
- * Refuse to write the folio out if we're called from reclaim context.
- *
- * This avoids stack overflows when called from deeply used stacks in
- * random callers for direct reclaim or memcg reclaim. We explicitly
- * allow reclaim from kswapd as the stack usage there is relatively low.
- *
- * This should never happen except in the case of a VM regression so
- * warn about it.
- */
- if (WARN_ON_ONCE((current->flags & (PF_MEMALLOC|PF_KSWAPD)) ==
- PF_MEMALLOC))
- goto redirty;
-
/*
* Is this folio beyond the end of the file?
*
@@ -1989,8 +1975,6 @@ static int iomap_do_writepage(struct folio *folio,

return iomap_writepage_map(wpc, wbc, inode, folio, end_pos);

-redirty:
- folio_redirty_for_writepage(wbc, folio);
unlock:
folio_unlock(folio);
return 0;
--
2.39.2