From: Mikulas Patocka <mpatocka@redhat.com>
Date: Wed, 10 Jul 2013 22:41:17 +0000 (+0100)
Subject: dm cache: fix arm link errors with inline
X-Git-Tag: upstream/snapshot3+hdmi~4709^2~5
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=43aeaa29573924df76f44eda2bbd94ca36e407b5;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

dm cache: fix arm link errors with inline

Use __always_inline to avoid a link failure with gcc 4.6 on ARM.
gcc 4.7 is OK.

It creates a function block_div.part.8, it references __udivdi3 and
__umoddi3 and it is never called. The references to __udivdi3 and
__umoddi3 cause a link failure.

Reported-by: Rob Herring <robherring2@gmail.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
---

diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index df44b60..0df3ec0 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -425,6 +425,10 @@ static bool block_size_is_power_of_two(struct cache *cache)
 	return cache->sectors_per_block_shift >= 0;
 }
 
+/* gcc on ARM generates spurious references to __udivdi3 and __umoddi3 */
+#if defined(CONFIG_ARM) && __GNUC__ == 4 && __GNUC_MINOR__ <= 6
+__always_inline
+#endif
 static dm_block_t block_div(dm_block_t b, uint32_t n)
 {
 	do_div(b, n);