linux-kernel - Re: [PATCH v2 2/2] intel_idle: Add a new flag to initialize the AMX state

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Date:   Thu, 10 Mar 2022 10:50:16 -0800
From:   "Chang S. Bae" <chang.seok.bae@...el.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
CC:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
Subject: Re: [PATCH v2 2/2] intel_idle: Add a new flag to initialize the AMX
 state

On 3/10/2022 10:34 AM, Rafael J. Wysocki wrote:
> On Wed, Mar 9, 2022 at 11:42 PM Chang S. Bae <chang.seok.bae@...el.com> wrote:
>>
[...]
>> @@ -792,7 +805,8 @@ static struct cpuidle_state spr_cstates[] __initdata = {
>>          {
>>                  .name = "C6",
>>                  .desc = "MWAIT 0x20",
>> -               .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
>> +               .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED | \
> 
> Why is the backslash at the end of the line needed?

No, it is not needed.

Sorry, I think I was mindlessly following the style in this new c-state 
table:
https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git/tree/drivers/idle/intel_idle.c?h=linux-next#n787

Thanks,
Chang