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[175.34.8.244]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2df5d01965esm3653455ad.23.2026.09.21.22.44.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 21 Sep 2026 22:44:51 -0700 (PDT) Message-ID: <89cf5ea2-d0bb-4cb8-a32b-ca843658e894@redhat.com> Date: Tue, 22 Sep 2026 15:44:47 +1000 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 10/12] 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: <20260917145617.2202986-1-ben.horgan@arm.com> <20260917145617.2202986-11-ben.horgan@arm.com> From: Gavin Shan In-Reply-To: <20260917145617.2202986-11-ben.horgan@arm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: GG6z_nIgWMgYbsLqddVPUkU5t14jIR6DINjKF0o671g_1790055892 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260921_224456_332946_830AD390 X-CRM114-Status: GOOD ( 12.63 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 9/18/26 12:56 AM, 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 > Tested-by: Gavin Shan > --- > drivers/resctrl/mpam_devices.c | 7 +++---- > 1 file changed, 3 insertions(+), 4 deletions(-) > Reviewed-by: Gavin Shan