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From:   Youling Tang <tangyouling@loongson.cn>
To:     Josh Poimboeuf <jpoimboe@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Huacai Chen <chenhuacai@kernel.org>,
        madvenka@linux.microsoft.com
Cc:     chenzhongjin@huawei.com, WANG Xuerui <kernel@xen0n.name>,
        Xi Ruoyao <xry111@xry111.site>, live-patching@vger.kernel.org,
        linux-kernel@vger.kernel.org, loongarch@lists.linux.dev,
        tangyouling00@gmail.com, youling.tang@outlook.com
Subject: [RFC PATCH v1 12/23] LoongArch: bug: Add reachable annotation to warning macros
Date:   Tue, 20 Jun 2023 15:50:08 +0800
Message-Id: <1687247415-32057-3-git-send-email-tangyouling@loongson.cn>
In-Reply-To: <1687247415-32057-1-git-send-email-tangyouling@loongson.cn>
References: <1687247415-32057-1-git-send-email-tangyouling@loongson.cn>
Precedence: bulk

WARN* and BUG* both use `break 0x1` opcodes and the distinction is
provided by the contents of the bug table. This table is not accessible
to objtool, so add an annotation to WARN* macros to let objtool know
that break handler will return an resume the execution of the instructions
following the WARN's break.

Signed-off-by: Youling Tang <tangyouling@loongson.cn>
---
 arch/loongarch/include/asm/bug.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/loongarch/include/asm/bug.h b/arch/loongarch/include/asm/bug.h
index d4ca3ba25418..08388876ade4 100644
--- a/arch/loongarch/include/asm/bug.h
+++ b/arch/loongarch/include/asm/bug.h
@@ -44,6 +44,7 @@
 do {								\
 	instrumentation_begin();				\
 	__BUG_FLAGS(BUGFLAG_WARNING|(flags));			\
+	annotate_reachable();					\
 	instrumentation_end();					\
 } while (0)
 
-- 
2.39.2