diff options
| author | Will Deacon <will.deacon@arm.com> | 2018-02-09 13:19:47 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-03-06 18:52:32 +0000 |
| commit | 6b24442d68e78c57c8837920ea5dfb252571847a (patch) | |
| tree | 180962e1b03868090b1232772c3357303d99d240 /arch/arm64/lib | |
| parent | 4e829b6735475313016787ec3d256e102167b94d (diff) | |
| download | op-kernel-dev-6b24442d68e78c57c8837920ea5dfb252571847a.zip op-kernel-dev-6b24442d68e78c57c8837920ea5dfb252571847a.tar.gz | |
arm64: lse: Pass -fomit-frame-pointer to out-of-line ll/sc atomics
In cases where x30 is used as a temporary in the out-of-line ll/sc atomics
(e.g. atomic_fetch_add), the compiler tends to put out a full stackframe,
which included pointing the x29 at the new frame.
Since these things aren't traceable anyway, we can pass -fomit-frame-pointer
to reduce the work when spilling. Since this is incompatible with -pg, we
also remove that from the CFLAGS for this file.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/lib')
| -rw-r--r-- | arch/arm64/lib/Makefile | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/lib/Makefile b/arch/arm64/lib/Makefile index 4e696f9..0ead8a1 100644 --- a/arch/arm64/lib/Makefile +++ b/arch/arm64/lib/Makefile @@ -17,6 +17,7 @@ CFLAGS_atomic_ll_sc.o := -fcall-used-x0 -ffixed-x1 -ffixed-x2 \ -ffixed-x7 -fcall-saved-x8 -fcall-saved-x9 \ -fcall-saved-x10 -fcall-saved-x11 -fcall-saved-x12 \ -fcall-saved-x13 -fcall-saved-x14 -fcall-saved-x15 \ - -fcall-saved-x18 + -fcall-saved-x18 -fomit-frame-pointer +CFLAGS_REMOVE_atomic_ll_sc.o := -pg lib-$(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) += uaccess_flushcache.o |
