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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 11/23] objtool: Add annotate_reachable() for objtools
Date:   Tue, 20 Jun 2023 15:50:07 +0800
Message-Id: <1687247415-32057-2-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

x86 removed annotate_reachable and replaced it with ASM_REACHABLE
which is not suitable for LoongArch micro.

Re-add annotation_reachable() for LoongArch.

Signed-off-by: Chen Zhongjin <chenzhongjin@huawei.com>
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
---
 include/linux/compiler.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 947a60b801db..6b33de8bf7c3 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -117,6 +117,14 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
  */
 #define __stringify_label(n) #n
 
+#define __annotate_reachable(c) ({					\
+	asm volatile(__stringify_label(c) ":\n\t"			\
+			".pushsection .discard.reachable\n\t"		\
+			".long " __stringify_label(c) "b - .\n\t"	\
+			".popsection\n\t");				\
+})
+#define annotate_reachable() __annotate_reachable(__COUNTER__)
+
 #define __annotate_unreachable(c) ({					\
 	asm volatile(__stringify_label(c) ":\n\t"			\
 		     ".pushsection .discard.unreachable\n\t"		\
@@ -129,6 +137,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
 #define __annotate_jump_table __section(".rodata..c_jump_table")
 
 #else /* !CONFIG_OBJTOOL */
+#define annotate_reachable()
 #define annotate_unreachable()
 #define __annotate_jump_table
 #endif /* CONFIG_OBJTOOL */
-- 
2.39.2