arm64: smp: initialize cpu offset earlier

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Now that we have a consistent place to initialize CPU context registers
early in the boot path, let's also initialize the per-cpu offset here.
This makes the primary and secondary boot paths more consistent, and
allows for the use of per-cpu operations earlier, which will be
necessary for instrumentation with KCSAN.

Note that smp_prepare_boot_cpu() still needs to re-initialize CPU0's
offset as immediately prior to this the per-cpu areas may be
reallocated, and hence the boot-time offset may be stale. A comment is
added to make this clear.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Suzuki Poulose <suzuki.poulose@arm.com>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20210520115031.18509-7-mark.rutland@arm.com
Signed-off-by: Will Deacon <will@kernel.org>

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This commit is contained in:

Mark Rutland 2021-05-20 12:50:31 +01:00 • committed by Will Deacon

parent 8e334d729b

commit 3d8c1a013d

4 changed files with 18 additions and 16 deletions

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1

arch/arm64/kernel/asm-offsets.c

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17

arch/arm64/kernel/head.S

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6

arch/arm64/kernel/setup.c

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10

arch/arm64/kernel/smp.c

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