linux-kernel - [RFC PATCH v6 04/12] livepatch: Add klp-convert annotation helpers

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Date:   Wed, 16 Feb 2022 11:39:32 -0500
From:   Joe Lawrence <joe.lawrence@...hat.com>
To:     live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org
Subject: [RFC PATCH v6 04/12] livepatch: Add klp-convert annotation helpers

From: Josh Poimboeuf <jpoimboe@...hat.com>

Define macros KLP_MODULE_RELOC and KLP_SYMPOS in
include/linux/livepatch.h to improve user-friendliness of the livepatch
annotation process.

Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Signed-off-by: Joao Moreira <jmoreira@...e.de>
Signed-off-by: Joe Lawrence <joe.lawrence@...hat.com>
---
 include/linux/livepatch.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/livepatch.h b/include/linux/livepatch.h
index 0fb05aae091a..3abb09bd807a 100644
--- a/include/linux/livepatch.h
+++ b/include/linux/livepatch.h
@@ -237,6 +237,18 @@ int klp_apply_section_relocs(struct module *pmod, Elf_Shdr *sechdrs,
 			     unsigned int symindex, unsigned int secindex,
 			     const char *objname);
 
+/* Used to annotate symbol relocations in livepatches */
+#define KLP_MODULE_RELOC(obj)						\
+	struct klp_module_reloc						\
+	__section(".klp.module_relocs." #obj)				\
+	__aligned(4)
+
+#define KLP_SYMPOS(symbol, pos)						\
+	{								\
+		.sym = &symbol,						\
+		.sympos = pos,						\
+	}
+
 #else /* !CONFIG_LIVEPATCH */
 
 static inline int klp_module_coming(struct module *mod) { return 0; }
-- 
2.26.3