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objtool: Add CONFIG_OBJTOOL

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Now that stack validation is an optional feature of objtool, add
CONFIG_OBJTOOL and replace most usages of CONFIG_STACK_VALIDATION with
it.

CONFIG_STACK_VALIDATION can now be considered to be frame-pointer
specific.  CONFIG_UNWINDER_ORC is already inherently valid for live
patching, so no need to "validate" it.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/939bf3d85604b2a126412bf11af6e3bd3b872bcb.1650300597.git.jpoimboe@redhat.com
This commit is contained in:
Josh Poimboeuf 2022-04-18 09:50:36 -07:00 • committed by Peter Zijlstra
parent c2bdd61c98
commit 03f16cd020
17 changed files with 73 additions and 57 deletions
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6
include/linux/compiler.h
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@ -109,7 +109,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
#endif
/* Unreachable code */
#ifdef CONFIG_STACK_VALIDATION
#ifdef CONFIG_OBJTOOL
/*
* 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
@ -128,10 +128,10 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
/* Annotate a C jump table to allow objtool to follow the code flow */
#define __annotate_jump_table __section(".rodata..c_jump_table")
#else
#else /* !CONFIG_OBJTOOL */
#define annotate_unreachable()
#define __annotate_jump_table
#endif
#endif /* CONFIG_OBJTOOL */
#ifndef unreachable
# define unreachable() do { \