linux-kernel - [PATCH] block/xen-blkback: Deinline put_free

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Message-Id: <1457897243-16043-1-git-send-email-dvlasenk@redhat.com>
Date:	Sun, 13 Mar 2016 20:27:22 +0100
From:	Denys Vlasenko <dvlasenk@...hat.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Roger Pau Monné <roger.pau@...rix.com>
Cc:	Denys Vlasenko <dvlasenk@...hat.com>,
	xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: [PATCH] block/xen-blkback: Deinline put_free_pages, save 645 bytes

This function compiles to 170 bytes of machine code. 7 callsites.

This function has a spinlocked code section,
which is significantly more expensive than call/return overhead.

Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
CC: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC: Roger Pau Monné <roger.pau@...rix.com>
CC: xen-devel@...ts.xenproject.org
CC: linux-kernel@...r.kernel.org
---
 drivers/block/xen-blkback/blkback.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index 4809c15..86798b4 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -142,7 +142,7 @@ static inline int get_free_page(struct xen_blkif_ring *ring, struct page **page)
 	return 0;
 }
 
-static inline void put_free_pages(struct xen_blkif_ring *ring, struct page **page,
+static void put_free_pages(struct xen_blkif_ring *ring, struct page **page,
                                   int num)
 {
 	unsigned long flags;
-- 
2.5.0