Mark Rutland 353e228eb3 arm64: initialize per-cpu offsets earlier ... The current initialization of the per-cpu offset register is difficult to follow and this initialization is not always early enough for upcoming instrumentation with KCSAN, where the instrumentation callbacks use the per-cpu offset. To make it possible to support KCSAN, and to simplify reasoning about early bringup code, let's initialize the per-cpu offset earlier, before we run any C code that may consume it. To do so, this patch adds a new init_this_cpu_offset() helper that's called before the usual primary/secondary start functions. For consistency, this is also used to re-initialize the per-cpu offset after the runtime per-cpu areas have been allocated (which can change CPU0's offset). So that init_this_cpu_offset() isn't subject to any instrumentation that might consume the per-cpu offset, it is marked with noinstr, preventing instrumentation. 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@kernel.org> Link: https://lore.kernel.org/r/20201005164303.21389-1-mark.rutland@arm.com Signed-off-by: Will Deacon <will@kernel.org>		2020-10-05 18:54:49 +01:00
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asm	arm64: initialize per-cpu offsets earlier	2020-10-05 18:54:49 +01:00
uapi/asm	Merge branches 'for-next/misc', 'for-next/vmcoreinfo', 'for-next/cpufeature', 'for-next/acpi', 'for-next/perf', 'for-next/timens', 'for-next/msi-iommu' and 'for-next/trivial' into for-next/core	2020-07-31 18:09:39 +01:00