linux-kernel - Re: [RFC 3/7] x86/percpu: Use C for percpu accesses when possible

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Date:   Mon, 22 Jul 2019 21:12:30 +0000
From:   Nadav Amit <namit@...are.com>
To:     Peter Zijlstra <peterz@...radead.org>
CC:     Andy Lutomirski <luto@...nel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [RFC 3/7] x86/percpu: Use C for percpu accesses when possible

> On Jul 22, 2019, at 1:52 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> 
> On Thu, Jul 18, 2019 at 10:41:06AM -0700, Nadav Amit wrote:
> 
>> diff --git a/arch/x86/include/asm/preempt.h b/arch/x86/include/asm/preempt.h
>> index 99a7fa9ab0a3..60f97b288004 100644
>> --- a/arch/x86/include/asm/preempt.h
>> +++ b/arch/x86/include/asm/preempt.h
>> @@ -91,7 +91,8 @@ static __always_inline void __preempt_count_sub(int val)
>>  */
>> static __always_inline bool __preempt_count_dec_and_test(void)
>> {
>> -	return GEN_UNARY_RMWcc("decl", __preempt_count, e, __percpu_arg([var]));
>> +	return GEN_UNARY_RMWcc("decl", __my_cpu_var(__preempt_count), e,
>> +			       __percpu_arg([var]));
>> }
> 
> Should this be in the previous patch?

Yes, it should.