From: Jens Axboe <jens.axboe@oracle.com>
Date: Fri, 5 Dec 2008 15:10:29 +0000 (+0100)
Subject: block: don't create bio_vec slabs of less than the inline number
X-Git-Tag: v2.6.30-rc1~660^2~16
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=a7fcd37cdcb47806fb8a9070f006ee34061defa6;p=karo-tx-linux.git

block: don't create bio_vec slabs of less than the inline number

If we don't have CONFIG_BLK_DEV_INTEGRITY set, then we don't have
any external dependencies on the bio_vec slabs. So don't create
the ones that we will inline anyway.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

diff --git a/fs/bio.c b/fs/bio.c
index cef6258b8943..9cc1430b4495 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -1589,6 +1589,13 @@ static void __init biovec_init_slabs(void)
 		int size;
 		struct biovec_slab *bvs = bvec_slabs + i;
 
+#ifndef CONFIG_BLK_DEV_INTEGRITY
+		if (bvs->nr_vecs <= BIO_INLINE_VECS) {
+			bvs->slab = NULL;
+			continue;
+		}
+#endif
+
 		size = bvs->nr_vecs * sizeof(struct bio_vec);
 		bvs->slab = kmem_cache_create(bvs->name, size, 0,
                                 SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);