linux-kernel - Re: [PATCH v2] MIPS: jump_label: Fix compat branch range check

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Message-ID: <7cf55c95-540e-b182-b4b3-e641535752e1@flygoat.com>
Date:   Wed, 9 Nov 2022 11:07:18 +0000
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     tsbogend@...ha.franken.de
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        ardb@...nel.org, rostedt@...dmis.org, stable@...r.kernel.org,
        Philippe Mathieu-Daudé <philmd@...aro.org>
Subject: Re: [PATCH v2] MIPS: jump_label: Fix compat branch range check



在 2022/11/3 15:10, Jiaxun Yang 写道:
> Cast upper bound of branch range to long to do signed compare,
> avoid negative offset trigger this warning.
>
> Fixes: 9b6584e35f40 ("MIPS: jump_label: Use compact branches for >= r6")
> Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
> Cc: stable@...r.kernel.org
> Reviewed-by: Philippe Mathieu-Daudé <philmd@...aro.org>

Ping :-)

Thanks
- Jiaxun

> ---
> v2: Fix typo, collect review tags.
> ---
>   arch/mips/kernel/jump_label.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/mips/kernel/jump_label.c b/arch/mips/kernel/jump_label.c
> index 71a882c8c6eb..f7978d50a2ba 100644
> --- a/arch/mips/kernel/jump_label.c
> +++ b/arch/mips/kernel/jump_label.c
> @@ -56,7 +56,7 @@ void arch_jump_label_transform(struct jump_entry *e,
>   			 * The branch offset must fit in the instruction's 26
>   			 * bit field.
>   			 */
> -			WARN_ON((offset >= BIT(25)) ||
> +			WARN_ON((offset >= (long)BIT(25)) ||
>   				(offset < -(long)BIT(25)));
>   
>   			insn.j_format.opcode = bc6_op;