From: Josh Poimboeuf Date: Mon, 6 Nov 2017 13:17:37 +0000 (-0600) Subject: objtool: Add a comment for the unreachable annotation macros X-Git-Tag: v4.15-rc1~7^2~6 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=d0c2e691d1cbe43662df3a08a4933f13acc352c3;p=users%2Fjedix%2Flinux-maple.git objtool: Add a comment for the unreachable annotation macros Add a comment for the unreachable annotation macros to explain their purpose and the '__COUNTER__' label hack. Suggested-by: Linus Torvalds Signed-off-by: Josh Poimboeuf Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/1570e48d9f87e0fc6f0126c32e7e1de6e109cb67.1509974104.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar --- diff --git a/include/linux/compiler.h b/include/linux/compiler.h index 202710420d6d..f8734fca54ce 100644 --- 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" \