linux-kernel - [RFC PATCH v4 18/37] arm64: kgdb: Mark code following kgdb brk as reachable

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Message-ID: <20220429094355.122389-19-chenzhongjin@huawei.com>
Date:   Fri, 29 Apr 2022 17:43:36 +0800
From:   Chen Zhongjin <chenzhongjin@...wei.com>
To:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-arch@...r.kernel.org>
CC:     <jthierry@...hat.com>, <catalin.marinas@....com>,
        <will@...nel.org>, <masahiroy@...nel.org>, <jpoimboe@...hat.com>,
        <peterz@...radead.org>, <ycote@...hat.com>,
        <herbert@...dor.apana.org.au>, <mark.rutland@....com>,
        <davem@...emloft.net>, <ardb@...nel.org>, <maz@...nel.org>,
        <tglx@...utronix.de>, <luc.vanoostenryck@...il.com>,
        <chenzhongjin@...wei.com>
Subject: [RFC PATCH v4 18/37] arm64: kgdb: Mark code following kgdb brk as reachable

From: Julien Thierry <jthierry@...hat.com>

In the general use case, KGDB breakpoint handler should return normally
to the instruction following the brk.

Signed-off-by: Julien Thierry <jthierry@...hat.com>
---
 arch/arm64/include/asm/kgdb.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/include/asm/kgdb.h b/arch/arm64/include/asm/kgdb.h
index 21fc85e9d2be..a8cb91d8d59b 100644
--- a/arch/arm64/include/asm/kgdb.h
+++ b/arch/arm64/include/asm/kgdb.h
@@ -19,6 +19,7 @@
 static inline void arch_kgdb_breakpoint(void)
 {
 	asm ("brk %0" : : "I" (KGDB_COMPILED_DBG_BRK_IMM));
+	annotate_reachable();
 }
 
 extern void kgdb_handle_bus_error(void);
-- 
2.17.1