linux-kernel - Re: [PATCH V2] LoongArch: Ensure FP/SIMD registers in the core dump file is up to date

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Message-ID: <2023082618-mocha-reactor-1dbe@gregkh>
Date:   Sat, 26 Aug 2023 17:22:31 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Huacai Chen <chenhuacai@...ngson.cn>
Cc:     Huacai Chen <chenhuacai@...nel.org>, loongarch@...ts.linux.dev,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        Guo Ren <guoren@...nel.org>, Xuerui Wang <kernel@...0n.name>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        linux-kernel@...r.kernel.org, loongson-kernel@...ts.loongnix.cn,
        stable@...r.kernel.org
Subject: Re: [PATCH V2] LoongArch: Ensure FP/SIMD registers in the core dump
 file is up to date

On Sat, Aug 26, 2023 at 10:23:41PM +0800, Huacai Chen wrote:
> This is a port of commit 379eb01c21795edb4c ("riscv: Ensure the value
> of FP registers in the core dump file is up to date").
> 
> The values of FP/SIMD registers in the core dump file come from the
> thread.fpu. However, kernel saves the FP/SIMD registers only before
> scheduling out the process. If no process switch happens during the
> exception handling, kernel will not have a chance to save the latest
> values of FP/SIMD registers. So it may cause their values in the core
> dump file incorrect. To solve this problem, force fpr_get()/simd_get()
> to save the FP/SIMD registers into the thread.fpu if the target task
> equals the current task.
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
> ---
> V2: Rename get_fpu_regs() to save_fpu_regs().

What stable tree(s) is this for?

thanks,

greg k-h