linux-kernel - Re: [PATCH v3 3/4] ARM: mm: fix build error in fix_to_virt with CONFIG_CC_OPTIMIZE_FOR

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Message-ID: <CAK7LNAQP6SgtbYcxZ7ApGg006omEZErNcDAVtPR=2RibxN8Ruw@mail.gmail.com>
Date:   Mon, 29 Oct 2018 22:05:44 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Changbin Du <changbin.du@...il.com>
Cc:     Michal Marek <michal.lkml@...kovi.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Steven Rostedt <rostedt@...dmis.org>, X86 ML <x86@...nel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-sparse@...r.kernel.org, Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH v3 3/4] ARM: mm: fix build error in fix_to_virt with CONFIG_CC_OPTIMIZE_FOR_DEBUGGING

On Sun, Oct 28, 2018 at 10:13 PM Changbin Du <changbin.du@...il.com> wrote:
>
> 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@...il.com>
> Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> ---

Applied to linux-kbuild





-- 
Best Regards
Masahiro Yamada