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| 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 | |
| parent | arm64: alternative: add auto-nop infrastructure (diff) | |
| download | linux-dev-6ba3b554f5b9b53cb99c0edb93f0ea855fbc712a.tar.xz linux-dev-6ba3b554f5b9b53cb99c0edb93f0ea855fbc712a.zip | |
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 '')
| -rw-r--r-- | arch/arm64/kernel/entry.S | 10 | ||||
| -rw-r--r-- | arch/arm64/lib/copy_page.S | 13 | ||||
| -rw-r--r-- | arch/arm64/mm/proc.S | 9 |
3 files changed, 8 insertions, 24 deletions
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index 6880dcc3b465..223d54a4d66b 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -150,13 +150,7 @@ ldr x23, [sp, #S_SP] // load return stack pointer msr sp_el0, x23 #ifdef CONFIG_ARM64_ERRATUM_845719 -alternative_if_not ARM64_WORKAROUND_845719 - nop - nop -#ifdef CONFIG_PID_IN_CONTEXTIDR - nop -#endif -alternative_else +alternative_if ARM64_WORKAROUND_845719 tbz x22, #4, 1f #ifdef CONFIG_PID_IN_CONTEXTIDR mrs x29, contextidr_el1 @@ -165,7 +159,7 @@ alternative_else msr contextidr_el1, xzr #endif 1: -alternative_endif +alternative_else_nop_endif #endif .endif msr elr_el1, x21 // set up the return data diff --git a/arch/arm64/lib/copy_page.S b/arch/arm64/lib/copy_page.S index 4c1e700840b6..c3cd65e31814 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] diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S index 5eb35964ab8e..1b11dcd7e851 100644 --- a/arch/arm64/mm/proc.S +++ b/arch/arm64/mm/proc.S @@ -127,17 +127,12 @@ ENTRY(cpu_do_switch_mm) bfi x0, x1, #48, #16 // set the ASID msr ttbr0_el1, x0 // set TTBR0 isb -alternative_if_not ARM64_WORKAROUND_CAVIUM_27456 - ret - nop - nop - nop -alternative_else +alternative_if ARM64_WORKAROUND_CAVIUM_27456 ic iallu dsb nsh isb +alternative_else_nop_endif ret -alternative_endif ENDPROC(cpu_do_switch_mm) .pushsection ".idmap.text", "ax" |