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

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Message-Id: <20221103151053.213583-1-jiaxun.yang@flygoat.com>
Date:   Thu,  3 Nov 2022 15:10:53 +0000
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     linux-mips@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, tsbogend@...ha.franken.de,
        ardb@...nel.org, rostedt@...dmis.org,
        Jiaxun Yang <jiaxun.yang@...goat.com>, stable@...r.kernel.org,
        Philippe Mathieu-Daudé <philmd@...aro.org>
Subject: [PATCH v2] MIPS: jump_label: Fix compat branch range check

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>
---
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;
-- 
2.34.1