From: Du Changbin <changbin.du@gmail.com>
To: yamada.masahiro@socionext.com, michal.lkml@markovi.net,
tglx@linutronix.de, mingo@redhat.com, linux@armlinux.org.uk,
akpm@linux-foundation.org
Cc: rostedt@goodmis.org, x86@kernel.org,
linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-sparse@vger.kernel.org, Changbin Du <changbin.du@intel.com>
Subject: [PATCH 3/4] ARM: mm: fix build error in fix_to_virt with CONFIG_CC_OPTIMIZE_FOR_DEBUGGING
Date: Thu, 18 Oct 2018 16:25:47 +0000 [thread overview]
Message-ID: <20181018162548.6399-4-changbin.du@gmail.com> (raw)
In-Reply-To: <20181018162548.6399-1-changbin.du@gmail.com>
From: Changbin Du <changbin.du@intel.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@intel.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
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 e46a6a446cdd..c08d74e76714 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 */
--
2.17.1
next prev parent reply other threads:[~2018-10-18 16:26 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-18 16:25 [PATCH 0/4] kernel hacking: GCC optimization for better debug experience (-Og) Du Changbin
2018-10-18 16:25 ` [PATCH 1/4] x86/mm: surround level4_kernel_pgt with #ifdef CONFIG_X86_5LEVEL...#endif Du Changbin
2018-10-18 16:25 ` [PATCH 2/4] kernel hacking: new config NO_AUTO_INLINE to disable compiler auto-inline optimizations Du Changbin
2018-10-18 16:57 ` Robin Murphy
2018-10-18 17:01 ` Du Changbin
2018-10-18 16:59 ` Steven Rostedt
2018-10-18 17:03 ` Du Changbin
2018-10-18 16:25 ` Du Changbin [this message]
2018-10-18 16:25 ` [PATCH 4/4] kernel hacking: new config CC_OPTIMIZE_FOR_DEBUGGING to apply GCC -Og optimization Du Changbin
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