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arm64: Clarify when cpu_enable() is called

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Strengthen the wording in the documentation for cpu_enable() to make it
more obvious to readers not already familiar with the code when the core
will call this callback and that this is intentional.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
[will: minor tweak to emphasis in the comment]
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Mark Brown 2019-08-08 15:05:54 +01:00 committed by Will Deacon
parent 37143dcc44
commit 38d1666760
1 changed files with 10 additions and 3 deletions
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13
arch/arm64/include/asm/cpufeature.h
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@ -289,9 +289,16 @@ struct arm64_cpu_capabilities {
u16 type; u16 type;
bool (*matches)(const struct arm64_cpu_capabilities *caps, int scope); bool (*matches)(const struct arm64_cpu_capabilities *caps, int scope);
/* /*
* Take the appropriate actions to enable this capability for this CPU. * Take the appropriate actions to configure this capability
* For each successfully booted CPU, this method is called for each * for this CPU. If the capability is detected by the kernel
* globally detected capability. * this will be called on all the CPUs in the system,
* including the hotplugged CPUs, regardless of whether the
* capability is available on that specific CPU. This is
* useful for some capabilities (e.g, working around CPU
* errata), where all the CPUs must take some action (e.g,
* changing system control/configuration). Thus, if an action
* is required only if the CPU has the capability, then the
* routine must check it before taking any action.
*/ */
void (*cpu_enable)(const struct arm64_cpu_capabilities *cap); void (*cpu_enable)(const struct arm64_cpu_capabilities *cap);
union { union {