[patch 162/167] lib/rhashtable: simplify bucket_table_alloc()

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From: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Subject: lib/rhashtable: simplify bucket_table_alloc()

As of ce91f6ee5b3b ("mm: kvmalloc does not fallback to vmalloc for
incompatible gfp flags") we can simplify the caller and trust kvzalloc()
to just do the right thing.  For the case of the GFP_ATOMIC context, we
can drop the __GFP_NORETRY flag for obvious reasons, and for the
__GFP_NOWARN case, however, it is changed such that the caller passes the
flag instead of making bucket_table_alloc() handle it.

This slightly changes the gfp flags passed on to nested_table_alloc() as
it will now also use GFP_ATOMIC | __GFP_NOWARN.  However, I consider this
a positive consequence as for the same reasons we want nowarn semantics in
bucket_table_alloc().

[manfred@xxxxxxxxxxxxxxxx: commit id extended to 12 digits, line wraps updated]
Link: http://lkml.kernel.org/r/20180712185241.4017-8-manfred@xxxxxxxxxxxxxxxx
Signed-off-by: Davidlohr Bueso <dbueso@xxxxxxx>
Signed-off-by: Manfred Spraul <manfred@xxxxxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Michael Kerrisk <mtk.manpages@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 lib/rhashtable.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

--- a/lib/rhashtable.c~lib-rhashtable-simplify-bucket_table_alloc
+++ a/lib/rhashtable.c
@@ -174,10 +174,7 @@ static struct bucket_table *bucket_table
 	int i;
 
 	size = sizeof(*tbl) + nbuckets * sizeof(tbl->buckets[0]);
-	if (gfp != GFP_KERNEL)
-		tbl = kzalloc(size, gfp | __GFP_NOWARN | __GFP_NORETRY);
-	else
-		tbl = kvzalloc(size, gfp);
+	tbl = kvzalloc(size, gfp);
 
 	size = nbuckets;
 
@@ -450,7 +447,7 @@ static int rhashtable_insert_rehash(stru
 
 	err = -ENOMEM;
 
-	new_tbl = bucket_table_alloc(ht, size, GFP_ATOMIC);
+	new_tbl = bucket_table_alloc(ht, size, GFP_ATOMIC | __GFP_NOWARN);
 	if (new_tbl == NULL)
 		goto fail;
 
_



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