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

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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@xxxxxx>
---
 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





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