linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
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


  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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20181018162548.6399-4-changbin.du@gmail.com \
    --to=changbin.du@gmail.com \
    --cc=akpm@linux-foundation.org \
    --cc=changbin.du@intel.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kbuild@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-sparse@vger.kernel.org \
    --cc=linux@armlinux.org.uk \
    --cc=michal.lkml@markovi.net \
    --cc=mingo@redhat.com \
    --cc=rostedt@goodmis.org \
    --cc=tglx@linutronix.de \
    --cc=x86@kernel.org \
    --cc=yamada.masahiro@socionext.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).