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Date:   Wed, 25 Oct 2023 18:57:22 +0100
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Subject: Re: [PATCH v6 14/24] x86/resctrl: Allow resctrl_arch_rmid_read() to
 sleep
Content-Language: en-GB
To:     Reinette Chatre <reinette.chatre@intel.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org
Cc:     Fenghua Yu <fenghua.yu@intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        H Peter Anvin <hpa@zytor.com>,
        Babu Moger <Babu.Moger@amd.com>,
        shameerali.kolothum.thodi@huawei.com,
        D Scott Phillips OS <scott@os.amperecomputing.com>,
        carl@os.amperecomputing.com, lcherian@marvell.com,
        bobo.shaobowang@huawei.com, tan.shaopeng@fujitsu.com,
        xingxin.hx@openanolis.org, baolin.wang@linux.alibaba.com,
        Jamie Iles <quic_jiles@quicinc.com>,
        Xin Hao <xhao@linux.alibaba.com>, peternewman@google.com,
        dfustini@baylibre.com, amitsinght@marvell.com
References: <20230914172138.11977-1-james.morse@arm.com>
 <20230914172138.11977-15-james.morse@arm.com>
 <2947d0b3-349d-4dc3-0c57-0a68b297327c@intel.com>
From:   James Morse <james.morse@arm.com>
In-Reply-To: <2947d0b3-349d-4dc3-0c57-0a68b297327c@intel.com>
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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