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 [thread overview]
Message-ID: <1687247415-32057-2-git-send-email-tangyouling@loongson.cn> (raw)
In-Reply-To: <1687247415-32057-1-git-send-email-tangyouling@loongson.cn>
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
next prev parent reply other threads:[~2023-06-20 7:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-20 7:50 [RFC PATCH v1 10/23] objtool: LoongArch: Implement decoder Youling Tang
2023-06-20 7:50 ` Youling Tang [this message]
2023-06-20 7:50 ` [RFC PATCH v1 12/23] LoongArch: bug: Add reachable annotation to warning macros Youling Tang
2023-06-20 7:50 ` [RFC PATCH v1 13/23] objtool: Add next member in struct reloc Youling Tang
2023-06-20 8:57 ` Peter Zijlstra
2023-06-20 7:50 ` [RFC PATCH v1 14/23] objtool: Add orc_print_dump() package Youling Tang
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