linux-kernel - Re: [PATCH 1/4] MIPS: Fix ISA I FP sigcontext access violation handling

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Date:   Tue, 1 Nov 2016 09:27:39 +0000
From:   Paul Burton <paul.burton@...tec.com>
To:     "Maciej W. Rozycki" <macro@...tec.com>
CC:     <linux-mips@...ux-mips.org>, Ralf Baechle <ralf@...ux-mips.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] MIPS: Fix ISA I FP sigcontext access violation handling

On Monday, 31 October 2016 16:25:44 GMT Maciej W. Rozycki wrote:
> Complement commit 0ae8dceaebe3 ("Merge with 2.3.10.") and use the local
> `fault' handler to recover from FP sigcontext access violation faults,
> like corresponding code does in r4k_fpu.S.  The `bad_stack' handler is
> in syscall.c and is not suitable here as we want to propagate the error
> condition up through the caller rather than killing the thread outright.
> 
> Signed-off-by: Maciej W. Rozycki <macro@...tec.com>
> ---
>  I guess it hardly ever triggers and code still builds, so it has aged so
> well...
> 
>   Maciej
> 
> linux-mips-isa1-sig-fp-context-fault.patch
> Index: linux-sfr-test/arch/mips/kernel/r2300_fpu.S
> ===================================================================
> --- linux-sfr-test.orig/arch/mips/kernel/r2300_fpu.S	2016-10-22
> 02:36:46.000000000 +0100 +++
> linux-sfr-test/arch/mips/kernel/r2300_fpu.S	2016-10-22 02:37:20.891186000
> +0100 @@ -21,7 +21,7 @@
>  #define EX(a,b)							\
>  9:	a,##b;							\
>  	.section __ex_table,"a";				\
> -	PTR	9b,bad_stack;					\
> +	PTR	9b,fault;					\
>  	.previous
> 
>  	.set	noreorder

Hi Maciej,

Looks good to me:

    Reviewed-by: Paul Burton <paul.burton@...tec.com>

Thanks,
    Paul
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