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objtool: Warn on zero-length functions

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All callable functions should have an ELF size.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/03d429c4fa87829c61c5dc0e89652f4d9efb62f1.1563413318.git.jpoimboe@redhat.com
This commit is contained in:
Josh Poimboeuf 2019-07-17 20:36:49 -05:00 • committed by Thomas Gleixner
parent e10cd8fe8d
commit 61e9b75a0c
1 changed files with 6 additions and 0 deletions
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6
tools/objtool/check.c
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@ -2357,6 +2357,12 @@ static int validate_functions(struct objtool_file *file)
if (func->type != STT_FUNC) if (func->type != STT_FUNC)
continue; continue;
if (!func->len) {
WARN("%s() is missing an ELF size annotation",
func->name);
warnings++;
}
if (func->pfunc != func || func->alias != func) if (func->pfunc != func || func->alias != func)
continue; continue;