Re: kernel miscompilation with gcc 4.8 for ARMv5

[Mark Hatle <mark.hatle@windriver.com>]

On 7/10/13 8:15 AM, Mike Looijmans wrote:
> On 07/10/2013 02:34 PM, Enrico Scholz wrote:
>> Enrico Scholz
>> <enrico.scholz-wttK6gPy29v+Hn7q9Vec/7NAH6kLmebB@public.gmane.org>
>> writes:
>>
>>> is it expected that recent gcc 4.8[1] compiles the kernel correctly?
>>> Kernels for ARMv5 platforms (PXA168 -> 3.4.52, MX28 -> 3.8.13) fail here
>>> 100% at early boot with
>>
>> Applying two upstream kernel commits
>> 455bd4c430b0c0a361f38e8658a0d6cb469942b5 (ARM: 7668/1: fix
>> memset-related crashes caused by recent GCC (4.7.2) optimizations) and
>> 418df63adac56841ef6b0f1fcf435bc64d4ed177 (ARM: 7670/1: fix the memset
>> fix) seem to fix the problem for me.
>>
>
> I encountered a compilation problem for MIPS kernels (version 3.3 and
> below) with the new GCC compiler:
>
>
>    arch/mips/mm/page.c:89:6: error: 'clear_page' alias in between
> function and variable is not supported
> void clear_page(void *page) __attribute__((alias("clear_page_array")));
>          ^
> arch/mips/mm/page.c:84:12: error: 'clear_page_array' aliased declaration
> [-Werror]
> static u32 clear_page_array[0x120 / 4];
>                ^
> arch/mips/mm/page.c:108:6: error: 'copy_page' alias in between function
> and variable is not supported
> void copy_page(void *to, void *from)
> __attribute__((alias("copy_page_array")));
>         ^
> arch/mips/mm/page.c:102:12: error: 'copy_page_array' aliased declaration
> [-Werror]
> static u32 copy_page_array[0x540 / 4];
>
>
> So I'll probably have to go and look for backports to apply here. Anyone
> happen to come across this one already?
> (Looking in the git history for that file suggests applying
> c022630633624a75b3b58f43dd3c6cc896a56cff from upstream)
>
> A 3.8 kernel is running just fine with gcc 4.8.

The following commit fixed the issue in 3.4.  I assume it'll work in other versions.

kernel.org commit: c022630633624a75b3b58f43dd3c6cc896a56cff

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c022630633624a75b3b58f43dd3c6cc896a56cff

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