lkml.org 
[lkml]   [2018]   [May]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v3 1/6] arm64: cpufeature: Allow early detect of specific features
From
Date


On 21/05/18 13:06, Daniel Thompson wrote:
> On Mon, May 21, 2018 at 12:45:22PM +0100, Suzuki K Poulose wrote:
>> On 21/05/18 12:35, Julien Thierry wrote:
>>> From: Daniel Thompson <daniel.thompson@linaro.org>
>>>
>>> Currently it is not possible to detect features of the boot CPU
>>> until the other CPUs have been brought up.
>>>
>>> This prevents us from reacting to features of the boot CPU until
>>> fairly late in the boot process. To solve this we allow a subset
>>> of features (that are likely to be common to all clusters) to be
>>> detected based on the boot CPU alone.
>>>
>>> Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
>>> [julien.thierry@arm.com: check non-boot cpu missing early features, avoid
>>> duplicates between early features and normal
>>> features]
>>> Signed-off-by: Julien Thierry <julien.thierry@arm.com>
>>> Cc: Catalin Marinas <catalin.marinas@arm.com>
>>> Cc: Will Deacon <will.deacon@arm.com>
>>> Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
>>
>> nit: Since this is completely different from what Daniel started with,
>> you could simply reset the author to yourself. The boot CPU feature was
>> added keeping this user in mind.
>
> Agree! It's no longer my patch.
>
> If you want to retain any credit than Suggested-by: would make quite
> sufficient.
>

Good point, I didn't think of that.

I'll change this after I get other reviews for this version.

Thanks,

>
>>
>> The patch as such looks good to me.
>>
>> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
>>
>>> ---
>>> arch/arm64/kernel/cpufeature.c | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
>>> index 9d1b06d..e03e897 100644
>>> --- a/arch/arm64/kernel/cpufeature.c
>>> +++ b/arch/arm64/kernel/cpufeature.c
>>> @@ -1030,7 +1030,7 @@ static void cpu_copy_el2regs(const struct arm64_cpu_capabilities *__unused)
>>> {
>>> .desc = "GIC system register CPU interface",
>>> .capability = ARM64_HAS_SYSREG_GIC_CPUIF,
>>> - .type = ARM64_CPUCAP_SYSTEM_FEATURE,
>>> + .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE,
>>> .matches = has_useable_gicv3_cpuif,
>>> .sys_reg = SYS_ID_AA64PFR0_EL1,
>>> .field_pos = ID_AA64PFR0_GIC_SHIFT,
>>> --
>>> 1.9.1
>>>
>>

--
Julien Thierry

\
 
 \ /
  Last update: 2018-05-21 14:11    [W:0.041 / U:2.364 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site