From: Thomas Gleixner <tglx@kernel.org>
To: Chen Yu <yu.c.chen@intel.com>,
tony.luck@intel.com, reinette.chatre@intel.com
Cc: x86@kernel.org, linux-kernel@vger.kernel.org, bp@alien8.de,
mingo@redhat.com, dave.hansen@linux.intel.com, hpa@zytor.com,
dave.martin@arm.com, james.morse@arm.com, fenghuay@nvidia.com,
babu.moger@amd.com, anil.keshavamurthy@broadcom.com
Subject: Re: [PATCH v3 5/6] fs/resctrl: Do not invoke smp_processor_id() in preemptible context
Date: Mon, 08 Jun 2026 10:36:48 +0200 [thread overview]
Message-ID: <87v7bt4ee7.ffs@fw13> (raw)
In-Reply-To: <a2ca366a2f5311e2a9bdb3a2cde140c4786ae132.1780710620.git.yu.c.chen@intel.com>
On Sat, Jun 06 2026 at 10:38, Chen Yu wrote:
> From: Tony Luck <tony.luck@intel.com>
>
> __l3_mon_event_count() and __l3_mon_event_count_sum() call
> smp_processor_id() to obtain the current CPU. However, some
> monitor events can be read from any CPU in task context via
> mon_event_count(); in that case the calling context is
> preemptible and smp_processor_id() triggers a debug warning.
Is this new with this MMIO stuff or is this an existing issue? If the
latter then this patch should be in front of the series and get a fixes
tag. If not the change log should explain it.
next prev parent reply other threads:[~2026-06-08 8:36 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-06 2:31 [PATCH v3 0/6] Introduce MMIO-based CMT access for Enhanced RDT Chen Yu
2026-06-06 2:32 ` [PATCH v3 1/6] x86/resctrl: Parse ACPI ERDT table and map RMDD domains by L3 cache ID Chen Yu
2026-06-08 8:59 ` Thomas Gleixner
2026-06-08 11:20 ` Chen, Yu C
2026-06-06 2:33 ` [PATCH v3 2/6] x86/resctrl: Parse ACPI CMRC table Chen Yu
2026-06-08 8:30 ` Thomas Gleixner
2026-06-06 2:35 ` [PATCH v3 3/6] x86/resctrl: Rename prev_msr to prev_mon_val Chen Yu
2026-06-08 8:32 ` Thomas Gleixner
2026-06-06 2:38 ` [PATCH v3 4/6] x86/resctrl: Refactor the monitor read function Chen Yu
2026-06-06 2:38 ` [PATCH v3 5/6] fs/resctrl: Do not invoke smp_processor_id() in preemptible context Chen Yu
2026-06-08 8:36 ` Thomas Gleixner [this message]
2026-06-08 11:26 ` Chen, Yu C
2026-06-08 15:10 ` Reinette Chatre
2026-06-08 16:45 ` Chen, Yu C
2026-06-08 15:32 ` Luck, Tony
2026-06-08 16:54 ` Chen, Yu C
2026-06-06 2:38 ` [PATCH v3 6/6] x86/resctrl: Add support for L3 occupancy monitoring via RMID MMIO read Chen Yu
2026-06-08 8:33 ` Thomas Gleixner
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