linux-kernel - [PATCH v5 3/4] ARM: mm: fix build error in fix_to_virt with CONFIG_CC_OPTIMIZE_FOR

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Message-Id: <1528186420-6615-4-git-send-email-changbin.du@intel.com>
Date:   Tue,  5 Jun 2018 16:13:39 +0800
From:   changbin.du@...el.com
To:     mingo@...hat.com, akpm@...ux-foundation.org,
        yamada.masahiro@...ionext.com, michal.lkml@...kovi.net
Cc:     rostedt@...dmis.org, tglx@...utronix.de, rdunlap@...radead.org,
        x86@...nel.org, linux@...linux.org.uk, lgirdwood@...il.com,
        broonie@...nel.org, arnd@...db.de, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sparse@...r.kernel.org,
        changbin.du@...il.com, Changbin Du <changbin.du@...el.com>
Subject: [PATCH v5 3/4] ARM: mm: fix build error in fix_to_virt with CONFIG_CC_OPTIMIZE_FOR_DEBUGGING

From: Changbin Du <changbin.du@...el.com>

With '-Og' optimization level, GCC would not optimize a count for a loop
as a constant value. But BUILD_BUG_ON() only accept compile-time constant
values. Let's use __fix_to_virt() to avoid the error.

arch/arm/mm/mmu.o: In function `fix_to_virt':
/home/changbin/work/linux/./include/asm-generic/fixmap.h:31: undefined reference to `__compiletime_assert_31'
Makefile:1051: recipe for target 'vmlinux' failed
make: *** [vmlinux] Error 1

Signed-off-by: Changbin Du <changbin.du@...el.com>
Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
v2: use __fix_to_virt() to fix the issue.
---
 arch/arm/mm/mmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index e46a6a4..c08d74e 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -1599,7 +1599,7 @@ static void __init early_fixmap_shutdown(void)
 		pte_t *pte;
 		struct map_desc map;
 
-		map.virtual = fix_to_virt(i);
+		map.virtual = __fix_to_virt(i);
 		pte = pte_offset_early_fixmap(pmd_off_k(map.virtual), map.virtual);
 
 		/* Only i/o device mappings are supported ATM */
-- 
2.7.4