diff options
| author | Sami Tolvanen <samitolvanen@google.com> | 2020-12-11 19:46:32 +0100 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2021-01-14 17:21:09 +0100 |
| commit | a31d793dbabd9251b5f46fb885a307b042bc79fe (patch) | |
| tree | d1d64c2c42b6216b7855322dc97e5850e197bcf2 /arch/arm64 | |
| parent | arm64: vdso: disable LTO (diff) | |
| download | linux-a31d793dbabd9251b5f46fb885a307b042bc79fe.tar.xz linux-a31d793dbabd9251b5f46fb885a307b042bc79fe.zip | |
arm64: disable recordmcount with DYNAMIC_FTRACE_WITH_REGS
DYNAMIC_FTRACE_WITH_REGS uses -fpatchable-function-entry, which makes
running recordmcount unnecessary as there are no mcount calls in object
files, and __mcount_loc doesn't need to be generated.
While there's normally no harm in running recordmcount even when it's
not strictly needed, this won't work with LTO as we have LLVM bitcode
instead of ELF objects.
This change selects FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY, which
disables recordmcount when patchable function entries are used instead.
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20201211184633.3213045-16-samitolvanen@google.com
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/Kconfig | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 05e17351e4f3..d644d975eddb 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -162,6 +162,8 @@ config ARM64 select HAVE_DYNAMIC_FTRACE select HAVE_DYNAMIC_FTRACE_WITH_REGS \ if $(cc-option,-fpatchable-function-entry=2) + select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY \ + if DYNAMIC_FTRACE_WITH_REGS select HAVE_EFFICIENT_UNALIGNED_ACCESS select HAVE_FAST_GUP select HAVE_FTRACE_MCOUNT_RECORD |