diff options
| author | Mark Rutland <mark.rutland@arm.com> | 2016-09-07 11:07:09 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2016-09-12 10:46:07 +0100 |
| commit | 6ba3b554f5b9b53cb99c0edb93f0ea855fbc712a (patch) | |
| tree | e9dc583beb65d3deb66fa72184afe4ed8550f9af /arch/arm64/lib | |
| parent | 792d47379f4d4c76692f1795f33d38582f8907fa (diff) | |
| download | op-kernel-dev-6ba3b554f5b9b53cb99c0edb93f0ea855fbc712a.zip op-kernel-dev-6ba3b554f5b9b53cb99c0edb93f0ea855fbc712a.tar.gz | |
arm64: use alternative auto-nop
Make use of the new alternative_if and alternative_else_nop_endif and
get rid of our homebew NOP sleds, making the code simpler to read.
Note that for cpu_do_switch_mm the ret has been moved out of the
alternative sequence, and in the default case there will be three
additional NOPs executed.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/lib')
| -rw-r--r-- | arch/arm64/lib/copy_page.S | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/arch/arm64/lib/copy_page.S b/arch/arm64/lib/copy_page.S index 4c1e700..c3cd65e 100644 --- a/arch/arm64/lib/copy_page.S +++ b/arch/arm64/lib/copy_page.S @@ -29,14 +29,11 @@ * x1 - src */ ENTRY(copy_page) -alternative_if_not ARM64_HAS_NO_HW_PREFETCH - nop - nop -alternative_else +alternative_if ARM64_HAS_NO_HW_PREFETCH # Prefetch two cache lines ahead. prfm pldl1strm, [x1, #128] prfm pldl1strm, [x1, #256] -alternative_endif +alternative_else_nop_endif ldp x2, x3, [x1] ldp x4, x5, [x1, #16] @@ -52,11 +49,9 @@ alternative_endif 1: subs x18, x18, #128 -alternative_if_not ARM64_HAS_NO_HW_PREFETCH - nop -alternative_else +alternative_if ARM64_HAS_NO_HW_PREFETCH prfm pldl1strm, [x1, #384] -alternative_endif +alternative_else_nop_endif stnp x2, x3, [x0] ldp x2, x3, [x1] |
