linux-kernel - [PATCH v6 15/33] arm64: bug: Add reachable annotation to warning macros

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Date:   Thu, 23 Jun 2022 09:48:59 +0800
From:   Chen Zhongjin <chenzhongjin@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org>,
        <linuxppc-dev@...ts.ozlabs.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kbuild@...r.kernel.org>, <live-patching@...r.kernel.org>
CC:     <jpoimboe@...nel.org>, <peterz@...radead.org>,
        <catalin.marinas@....com>, <will@...nel.org>,
        <masahiroy@...nel.org>, <michal.lkml@...kovi.net>,
        <ndesaulniers@...gle.com>, <mark.rutland@....com>,
        <pasha.tatashin@...een.com>, <broonie@...nel.org>,
        <chenzhongjin@...wei.com>, <rmk+kernel@...linux.org.uk>,
        <madvenka@...ux.microsoft.com>, <christophe.leroy@...roup.eu>,
        <daniel.thompson@...aro.org>
Subject: [PATCH v6 15/33] arm64: bug: Add reachable annotation to warning macros

WARN* and BUG* both use brk #0x800 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 brk handler will return an resume the execution of the instructions
following the WARN's brk.

Signed-off-by: Julien Thierry <jthierry@...hat.com>
Signed-off-by: Chen Zhongjin <chenzhongjin@...wei.com>
---
 arch/arm64/include/asm/bug.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/bug.h b/arch/arm64/include/asm/bug.h
index 28be048db3f6..9917429971d4 100644
--- a/arch/arm64/include/asm/bug.h
+++ b/arch/arm64/include/asm/bug.h
@@ -19,7 +19,11 @@
 	unreachable();					\
 } while (0)
 
-#define __WARN_FLAGS(flags) __BUG_FLAGS(BUGFLAG_WARNING|(flags))
+#define __WARN_FLAGS(flags)			\
+do {						\
+	__BUG_FLAGS(BUGFLAG_WARNING|(flags));	\
+	annotate_reachable();			\
+} while (0)
 
 #define HAVE_ARCH_BUG
 
-- 
2.17.1