linux-kernel - [PATCH 4/8] livepatch: Add klp-convert annotation helpers

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Date:   Tue, 29 Aug 2017 16:01:36 -0300
From:   Joao Moreira <jmoreira@...e.de>
To:     live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     mbenes@...e.cz, mmarek@...e.cz, pmladek@...e.com, jikos@...e.cz,
        nstange@...e.de, jroedel@...e.de, matz@...e.de,
        jpoimboe@...hat.com, khlebnikov@...dex-team.ru, jeyu@...nel.org,
        jmoreira@...e.de
Subject: [PATCH 4/8] 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.

[jmoreira:
* split up: move KLP_MODULE_RELOC from previous patch to here
* add KLP_SYMPOS
* move macros from include/uapi/livepatch.h to include/linux/livepatch.h
]

Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Signed-off-by: Joao Moreira <jmoreira@...e.de>
---
 include/linux/livepatch.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/livepatch.h b/include/linux/livepatch.h
index 96a75be7ef50..3956929f21bc 100644
--- a/include/linux/livepatch.h
+++ b/include/linux/livepatch.h
@@ -165,6 +165,17 @@ static inline bool klp_have_reliable_stack(void)
 	       IS_ENABLED(CONFIG_HAVE_RELIABLE_STACKTRACE);
 }
 
+/* Used to annotate symbol relocations in livepatches */
+#define KLP_MODULE_RELOC(obj)						\
+	struct klp_module_reloc						\
+	__attribute__((__section__(".klp.module_relocs." #obj)))
+
+#define KLP_SYMPOS(symbol, pos)						\
+	{								\
+		.sym = &symbol,						\
+		.sympos = pos,						\
+	},
+
 #else /* !CONFIG_LIVEPATCH */
 
 static inline int klp_module_coming(struct module *mod) { return 0; }
-- 
2.12.0