* [PATCH] MIPS: jump_label: Fix compat branch range check
@ 2022-10-29 20:35 Jiaxun Yang
2022-10-29 23:22 ` Philippe Mathieu-Daudé
0 siblings, 1 reply; 2+ messages in thread
From: Jiaxun Yang @ 2022-10-29 20:35 UTC (permalink / raw)
To: linux-mips; +Cc: linux-kernel, tsbogend, ardb, rostedt, Jiaxun Yang, stable
Cast upper bound of branch range to long to do signed compare,
avoid negtive offset trigger this warning.
Fixes: 9b6584e35f40 ("MIPS: jump_label: Use compact branches for >= r6")
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: stable@vger.kernel.org
---
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;
--
2.34.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] MIPS: jump_label: Fix compat branch range check
2022-10-29 20:35 [PATCH] MIPS: jump_label: Fix compat branch range check Jiaxun Yang
@ 2022-10-29 23:22 ` Philippe Mathieu-Daudé
0 siblings, 0 replies; 2+ messages in thread
From: Philippe Mathieu-Daudé @ 2022-10-29 23:22 UTC (permalink / raw)
To: Jiaxun Yang, linux-mips; +Cc: linux-kernel, tsbogend, ardb, rostedt, stable
On 29/10/22 22:35, Jiaxun Yang wrote:
> Cast upper bound of branch range to long to do signed compare,
> avoid negtive offset trigger this warning.
Typo "negative".
> Fixes: 9b6584e35f40 ("MIPS: jump_label: Use compact branches for >= r6")
> Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
> Cc: stable@vger.kernel.org
> ---
> 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)));
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
^ permalink raw reply [flat|nested] 2+ messages in thread
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