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| author |   Ard Biesheuvel <ardb@kernel.org> | 2021-11-25 10:26:44 +0100 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2021-12-06 12:49:17 +0100 |
| commit | 7b9896c352073156a325c3bb0dc4c46e06e2a468 (patch) | |
| tree | a9e6e3be8a6a2b91a147f3e9ae82dfb7fbd860e5 /arch/arm/mm/Kconfig | |
| parent | ARM: assembler: add optimized ldr/str macros to load variables from memory (diff) | |
| download | linux-dev-7b9896c352073156a325c3bb0dc4c46e06e2a468.tar.xz linux-dev-7b9896c352073156a325c3bb0dc4c46e06e2a468.zip | |
ARM: percpu: add SMP_ON_UP support
Permit the use of the TPIDRPRW system register for carrying the per-CPU
offset in generic SMP configurations that also target non-SMP capable
ARMv6 cores. This uses the SMP_ON_UP code patching framework to turn all
TPIDRPRW accesses into reads/writes of entry #0 in the __per_cpu_offset
array.
While at it, switch over some existing direct TPIDRPRW accesses in asm
code to invocations of a new helper that is patched in the same way when
necessary.
Note that CPU_V6+SMP without SMP_ON_UP results in a kernel that does not
boot on v6 CPUs without SMP extensions, so add this dependency to
Kconfig as well.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Marc Zyngier <maz@kernel.org>
Tested-by: Vladimir Murzin <vladimir.murzin@arm.com> # ARMv7M
Diffstat (limited to 'arch/arm/mm/Kconfig')
| -rw-r--r-- | arch/arm/mm/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index 58afba346729..a91ff22c6c2e 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -386,6 +386,7 @@ config CPU_V6 select CPU_PABRT_V6 select CPU_THUMB_CAPABLE select CPU_TLB_V6 if MMU + select SMP_ON_UP if SMP # ARMv6k config CPU_V6K |