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objtool: Add a comment for the unreachable annotation macros
author
Josh Poimboeuf
<jpoimboe@redhat.com>
Mon, 6 Nov 2017 13:17:37 +0000
(07:17 -0600)
committer
Ingo Molnar
<mingo@kernel.org>
Tue, 7 Nov 2017 09:48:22 +0000
(10:48 +0100)
Add a comment for the unreachable annotation macros to explain their
purpose and the '__COUNTER__' label hack.
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link:
http://lkml.kernel.org/r/1570e48d9f87e0fc6f0126c32e7e1de6e109cb67.1509974104.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
include/linux/compiler.h
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diff --git
a/include/linux/compiler.h
b/include/linux/compiler.h
index 202710420d6deba1bba8107616359ae069ffd5e7..f8734fca54ce1572b9ad175d36c2f5a9d8202521 100644
(file)
--- a/
include/linux/compiler.h
+++ b/
include/linux/compiler.h
@@
-187,6
+187,11
@@
void ftrace_likely_update(struct ftrace_likely_data *f, int val,
/* Unreachable code */
#ifdef CONFIG_STACK_VALIDATION
+/*
+ * These macros help objtool understand GCC code flow for unreachable code.
+ * The __COUNTER__ based labels are a hack to make each instance of the macros
+ * unique, to convince GCC not to merge duplicate inline asm statements.
+ */
#define annotate_reachable() ({ \
asm("%c0:\n\t" \
".pushsection .discard.reachable\n\t" \