linux-kernel - Re: [PATCH 6/6] MIPS: CPS: drop .set mips64r2 directives

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Message-ID: <55F3C273.3030704@phrozen.org>
Date:	Sat, 12 Sep 2015 08:13:07 +0200
From:	John Crispin <john@...ozen.org>
To:	Paul Burton <paul.burton@...tec.com>, ralf@...ux-mips.org,
	linux-mips@...ux-mips.org
Cc:	Markos Chandras <markos.chandras@...tec.com>,
	stable@...r.kernel.org, linux-kernel@...r.kernel.org,
	James Hogan <james.hogan@...tec.com>
Subject: Re: [PATCH 6/6] MIPS: CPS: drop .set mips64r2 directives

Hi Paul,

--> http://www.linux-mips.org/archives/linux-mips/2015-09/msg00057.html

	John

On 10/09/2015 20:03, Paul Burton wrote:
> Ralf: is there a reason you've only applied patch 1 of this series?
> 
> v4.2 is broken because these didn't get in (despite being submitted well
> before the release), and master is still broken because they still
> haven't gotten in. If there's a reason you didn't merge them please let
> me know, otherwise please can we get them in ASAP.
> 
> Thanks,
>     Paul
> 
> On Wed, Aug 05, 2015 at 03:42:40PM -0700, Paul Burton wrote:
>> Commit 977e043d5ea1 ("MIPS: kernel: cps-vec: Replace mips32r2 ISA level
>> with mips64r2") leads to .set mips64r2 directives being present in 32
>> bit (ie. CONFIG_32BIT=y) kernels. This is incorrect & leads to MIPS64
>> instructions being emitted by the assembler when expanding
>> pseudo-instructions. For example the "move" instruction can legitimately
>> be expanded to a "daddu". This causes problems when the kernel is run on
>> a MIPS32 CPU, as CONFIG_32BIT kernels of course often are...
>>
>> Fix this by dropping the .set <ISA> directives entirely now that Kconfig
>> should be ensuring that kernels including this code are built with a
>> suitable -march= compiler flag.
>>
>> Signed-off-by: Paul Burton <paul.burton@...tec.com>
>> Cc: Markos Chandras <markos.chandras@...tec.com>
>> Cc: <stable@...r.kernel.org> # 3.16+
>> ---
>>
>>  arch/mips/kernel/cps-vec.S | 2 --
>>  1 file changed, 2 deletions(-)
>>
>> diff --git a/arch/mips/kernel/cps-vec.S b/arch/mips/kernel/cps-vec.S
>> index 209ded1..763d8b7 100644
>> --- a/arch/mips/kernel/cps-vec.S
>> +++ b/arch/mips/kernel/cps-vec.S
>> @@ -229,7 +229,6 @@ LEAF(mips_cps_core_init)
>>  	has_mt	t0, 3f
>>  
>>  	.set	push
>> -	.set	mips64r2
>>  	.set	mt
>>  
>>  	/* Only allow 1 TC per VPE to execute... */
>> @@ -348,7 +347,6 @@ LEAF(mips_cps_boot_vpes)
>>  	 nop
>>  
>>  	.set	push
>> -	.set	mips64r2
>>  	.set	mt
>>  
>>  1:	/* Enter VPE configuration state */
>> -- 
>> 2.5.0
>>
> 
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