linux-kernel - Re: [PATCH v6 14/24] x86/resctrl: Allow resctrl_arch_rmid

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Message-ID: <4adbf8dd-6c19-969c-84cd-297caae4b8f1@arm.com>
Date:   Wed, 25 Oct 2023 18:57:22 +0100
From:   James Morse <james.morse@....com>
To:     Reinette Chatre <reinette.chatre@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        H Peter Anvin <hpa@...or.com>,
        Babu Moger <Babu.Moger@....com>,
        shameerali.kolothum.thodi@...wei.com,
        D Scott Phillips OS <scott@...amperecomputing.com>,
        carl@...amperecomputing.com, lcherian@...vell.com,
        bobo.shaobowang@...wei.com, tan.shaopeng@...itsu.com,
        xingxin.hx@...nanolis.org, baolin.wang@...ux.alibaba.com,
        Jamie Iles <quic_jiles@...cinc.com>,
        Xin Hao <xhao@...ux.alibaba.com>, peternewman@...gle.com,
        dfustini@...libre.com, amitsinght@...vell.com
Subject: Re: [PATCH v6 14/24] x86/resctrl: Allow resctrl_arch_rmid_read() to
 sleep

Hi Reinette,

On 03/10/2023 22:18, Reinette Chatre wrote:
> On 9/14/2023 10:21 AM, James Morse wrote:
>> @@ -245,6 +250,17 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_domain *d,
>>  			   u32 closid, u32 rmid, enum resctrl_event_id eventid,
>>  			   u64 *val);
>>  
>> +/**
>> + * resctrl_arch_rmid_read_context_check()  - warn about invalid contexts
>> + *
>> + * When built with CONFIG_DEBUG_ATOMIC_SLEEP generate a warning when
>> + * resctrl_arch_rmid_read() is called with preemption disabled.
>> + */
>> +static inline void resctrl_arch_rmid_read_context_check(void)
>> +{
>> +	if (!irqs_disabled())
>> +		might_sleep();
>> +}
>>  
>>  /**
>>   * resctrl_arch_reset_rmid() - Reset any private state associated with rmid
> 
> I was expecting the above to look like you said it would look [1].

Hmm, not sure what happened there - it even made it into the changelog for the patch.
Presumably an earlier change conflicted and I messed up the resolution.

Fixed now.


Thanks,

James