linux-kernel - Re: [PATCH] arm64: LLVMLinux: Add missing abort() for AARCH64

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Date:	Sat, 6 Sep 2014 19:49:21 -0700
From:	Mark Charlebois <charlebm@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Behan Webster <behanw@...verseincode.com>,
	catalin.marinas@....com, jays.lee@...sung.com, will.deacon@....com,
	kgene.kim@...sung.com, steve.capper@...aro.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	sungjinn.chung@...sung.com
Subject: Re: [PATCH] arm64: LLVMLinux: Add missing abort() for AARCH64

On Sat, Sep 6, 2014 at 7:12 AM, Arnd Bergmann <arnd@...db.de> wrote:
> On Friday 05 September 2014 16:21:42 behanw@...verseincode.com wrote:
>> From: Mark Charlebois <charlebm@...il.com>
>>
>> Add missing abort for arch aarch64.
>>
>> This patch makes the aarch64 kernel able to compile with gcc or clang.
>>
>> Signed-off-by: Mark Charlebois <charlebm@...il.com>
>> Signed-off-by: Behan Webster <behanw@...verseincode.com>
>
> You don't describe why this is needed. When does clang emit an abort()
> call? Is that the expected behavior when not linking against a full
> C library?

I just tried recompiling for vexpress64 without the abort call and it
seems the patch is no longer needed. When I added this I mimicked the
behavior of abort for arm which at the time was defined in the kernel
code.

Sorry for the churn.

-Mark

>
>>  arch/arm64/kernel/traps.c | 9 +++++++++
>>  1 file changed, 9 insertions(+)
>>
>> diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
>> index 02cd3f0..123cd6e 100644
>> --- a/arch/arm64/kernel/traps.c
>> +++ b/arch/arm64/kernel/traps.c
>> @@ -349,6 +349,15 @@ void __pgd_error(const char *file, int line, unsigned long val)
>>         pr_crit("%s:%d: bad pgd %016lx.\n", file, line, val);
>>  }
>>
>> +void abort(void)
>> +{
>> +       BUG();
>> +
>> +       /* if that doesn't kill us, halt */
>> +       panic("Oops failed to kill thread");
>> +}
>> +EXPORT_SYMBOL(abort);
>
> I don't see the point in doing both BUG() and panic(). Doesn't panic()
> already print all the information you want in this case?
>
>         Arnd
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