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[175.34.8.244]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84a4f2778acsm4220043b3a.20.2026.07.15.21.52.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 15 Jul 2026 21:52:18 -0700 (PDT) Message-ID: <2751f277-6c94-4d8e-897d-73974b7c6e3c@redhat.com> Date: Thu, 16 Jul 2026 14:52:12 +1000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 10/11] arm_mpam: Don't loop forever if there is the maximum possible amount of PARTIDs To: Ben Horgan Cc: james.morse@arm.com, reinette.chatre@intel.com, fenghuay@nvidia.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, dave.martin@arm.com, andre.przywara@arm.com References: <20260710115546.29644-1-ben.horgan@arm.com> <20260710115546.29644-11-ben.horgan@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20260710115546.29644-11-ben.horgan@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 7/10/26 9:55 PM, Ben Horgan wrote: > On a theoretical platform with the maximum possible number of usable > PARTIDs, 0XFFFF, the loops iterating over PARTID in mpam_reset_ris() and > mpam_reprogram_ris() will never reach their termination condition leading > to a system hang when register the cpu hotplug handlers when MPAM is > enabling. > > Fix these loops. > > Fixes: f188a36ca241 ("arm_mpam: Reset MSC controls from cpuhp callbacks") > Fixes: 09b89d2a72f3 ("arm_mpam: Allow configuration to be applied and restored during cpu online") > Signed-off-by: Ben Horgan > --- > drivers/resctrl/mpam_devices.c | 7 +++---- > 1 file changed, 3 insertions(+), 4 deletions(-) > Reviewed-by: Gavin Shan