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From: "Du, Changbin" <changbin.du@intel.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: changbin.du@intel.com, yamada.masahiro@socionext.com,
	michal.lkml@markovi.net, tglx@linutronix.de, mingo@redhat.com,
	akpm@linux-foundation.org, rdunlap@infradead.org, x86@kernel.org,
	lgirdwood@gmail.com, broonie@kernel.org, arnd@arndb.de,
	linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arch@vger.kernel.org
Subject: Re: [PATCH v4 4/4] asm-generic: fix build error in fix_to_virt with CONFIG_CC_OPTIMIZE_FOR_DEBUGGING
Date: Thu, 10 May 2018 20:29:12 +0800	[thread overview]
Message-ID: <20180510122912.mqmpy4j4dj2trb5r@intel.com> (raw)
In-Reply-To: <20180509085224.34116e36@gandalf.local.home>

On Wed, May 09, 2018 at 08:52:24AM -0400, Steven Rostedt wrote:
> On Wed,  9 May 2018 16:43:16 +0800
> changbin.du@intel.com wrote:
> 
> > 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
> 
> Perhaps we should put this patch ahead of patch 3. Why allow it to
> break?
> 
Agree, let me exchange the last two patches.

> Anyway, besides that, I think the series looks good.
> 
> For the series: Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
> 
> -- Steve
> 
> 
> > 
> > Signed-off-by: Changbin Du <changbin.du@intel.com>
> > 
> > ---
> > 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 */
> 

-- 
Thanks,
Changbin Du

      reply	other threads:[~2018-05-10 12:39 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-09  8:43 [PATCH v4 0/4] kernel hacking: GCC optimization for better debug experience (-Og) changbin.du
2018-05-09  8:43 ` [PATCH v4 1/4] x86/mm: surround level4_kernel_pgt with #ifdef CONFIG_X86_5LEVEL...#endif changbin.du
2018-05-09  8:43 ` [PATCH v4 2/4] kernel hacking: new config NO_AUTO_INLINE to disable compiler auto-inline optimizations changbin.du
2018-05-09 18:29   ` kbuild test robot
2018-05-09 20:04   ` kbuild test robot
2018-05-09  8:43 ` [PATCH v4 3/4] kernel hacking: new config CC_OPTIMIZE_FOR_DEBUGGING to apply GCC -Og optimization changbin.du
2018-05-10 20:59   ` kbuild test robot
2018-05-11  3:18   ` kbuild test robot
2018-05-09  8:43 ` [PATCH v4 4/4] asm-generic: fix build error in fix_to_virt with CONFIG_CC_OPTIMIZE_FOR_DEBUGGING changbin.du
2018-05-09 12:52   ` Steven Rostedt
2018-05-10 12:29     ` Du, Changbin [this message]

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