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| author | Josh Poimboeuf <jpoimboe@redhat.com> | 2022-04-18 09:50:39 -0700 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-04-22 12:32:04 +0200 |
| commit | 4ab7674f5951ac6a8ac4fa8828090edb64a4771f (patch) | |
| tree | acd05dfd8faea515ddc411501bd25627da4cd148 /arch/Kconfig | |
| parent | 26e176896a5bb9222ae3433da902edd2566a61a4 (diff) | |
| download | lwn-4ab7674f5951ac6a8ac4fa8828090edb64a4771f.tar.gz lwn-4ab7674f5951ac6a8ac4fa8828090edb64a4771f.zip | |
objtool: Make jump label hack optional
Objtool secretly does a jump label hack to overcome the limitations of
the toolchain. Make the hack explicit (and optional for other arches)
by turning it into a cmdline option and kernel config option.
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/3bdcbfdd27ecb01ddec13c04bdf756a583b13d24.1650300597.git.jpoimboe@redhat.com
Diffstat (limited to 'arch/Kconfig')
| -rw-r--r-- | arch/Kconfig | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/Kconfig b/arch/Kconfig index 04cdef16db24..9dce6d6e3bc3 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -46,6 +46,7 @@ config JUMP_LABEL bool "Optimize very unlikely/likely branches" depends on HAVE_ARCH_JUMP_LABEL depends on CC_HAS_ASM_GOTO + select OBJTOOL if HAVE_JUMP_LABEL_HACK help This option enables a transparent branch optimization that makes certain almost-always-true or almost-always-false branch @@ -1031,6 +1032,9 @@ config ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT config HAVE_OBJTOOL bool +config HAVE_JUMP_LABEL_HACK + bool + config HAVE_STACK_VALIDATION bool help |