linux-kernel - Re: [PATCH] MIPS: Fix IRQ tracing when call handle

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Message-ID: <20200526130525.GC8487@alpha.franken.de>
Date:   Tue, 26 May 2020 15:05:25 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Lichao Liu <liulichao@...ngson.cn>
Cc:     YuanJunQing <yuanjunqing66@....com>, paulburton@...nel.org,
        chenhc@...ote.com, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MIPS: Fix IRQ tracing when call handle_fpe()

On Tue, May 26, 2020 at 02:03:14PM +0800, Lichao Liu wrote:
> From: YuanJunQing <yuanjunqing66@....com>
> 
> Register "a1" is unsaved in this function,
>  when CONFIG_TRACE_IRQFLAGS is enabled,
>  the TRACE_IRQS_OFF macro will call trace_hardirqs_off(),
>  and this may change register "a1".
>  The variment of register "a1" may send SIGFPE signal
>  to task when call do_fpe(),and this may kill the task.
> 
> Signed-off-by: YuanJunQing <yuanjunqing66@....com>

if you send patches from other people, please add your
Signed-off-by.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]