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authorChristoph Hellwig <hch@lst.de>2022-01-22 09:14:38 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-01-22 09:33:38 +0300
commit3d6035f136009f9cae380022754cba31f32570c5 (patch)
tree27abeef2c531adcc66d3030294f9ff4c3bef2351 /mm
parent0a4ee518185e902758191d968600399f3bc2be31 (diff)
downloadlinux-3d6035f136009f9cae380022754cba31f32570c5.tar.xz
frontswap: remove frontswap_writethrough
frontswap_writethrough is never called, so remove it. Link: https://lkml.kernel.org/r/20211224062246.1258487-3-hch@lst.de Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Juergen Gross <jgross@suse.com> Cc: Dan Streetman <ddstreet@ieee.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Hugh Dickins <hughd@google.com> Cc: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Seth Jennings <sjenning@redhat.com> Cc: Vitaly Wool <vitaly.wool@konsulko.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/frontswap.c23
1 files changed, 1 insertions, 22 deletions
diff --git a/mm/frontswap.c b/mm/frontswap.c
index 6bed12260dea..51a662a83955 100644
--- a/mm/frontswap.c
+++ b/mm/frontswap.c
@@ -33,16 +33,6 @@ static struct frontswap_ops *frontswap_ops __read_mostly;
for ((ops) = frontswap_ops; (ops); (ops) = (ops)->next)
/*
- * If enabled, frontswap_store will return failure even on success. As
- * a result, the swap subsystem will always write the page to swap, in
- * effect converting frontswap into a writethrough cache. In this mode,
- * there is no direct reduction in swap writes, but a frontswap backend
- * can unilaterally "reclaim" any pages in use with no data loss, thus
- * providing increases control over maximum memory usage due to frontswap.
- */
-static bool frontswap_writethrough_enabled __read_mostly;
-
-/*
* If enabled, the underlying tmem implementation is capable of doing
* exclusive gets, so frontswap_load, on a successful tmem_get must
* mark the page as no longer in frontswap AND mark it dirty.
@@ -171,15 +161,6 @@ void frontswap_register_ops(struct frontswap_ops *ops)
EXPORT_SYMBOL(frontswap_register_ops);
/*
- * Enable/disable frontswap writethrough (see above).
- */
-void frontswap_writethrough(bool enable)
-{
- frontswap_writethrough_enabled = enable;
-}
-EXPORT_SYMBOL(frontswap_writethrough);
-
-/*
* Enable/disable frontswap exclusive gets (see above).
*/
void frontswap_tmem_exclusive_gets(bool enable)
@@ -283,9 +264,7 @@ int __frontswap_store(struct page *page)
} else {
inc_frontswap_failed_stores();
}
- if (frontswap_writethrough_enabled)
- /* report failure so swap also writes to swap device */
- ret = -1;
+
return ret;
}
EXPORT_SYMBOL(__frontswap_store);