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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-14332405e92sm8951234c88.8.2026.09.05.19.39.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 05 Sep 2026 19:39:06 -0700 (PDT) From: Brian Cain To: linux-kernel@vger.kernel.org Cc: sid.manning@oss.qualcomm.com, peterz@infradead.org, pierrick.bouvier@oss.qualcomm.com, linux-hexagon@vger.kernel.org, paulmck@kernel.org, Brian Cain , Ingo Molnar , Frederic Weisbecker Subject: [PATCH] smp: align struct __call_single_node to 8 bytes Date: Sat, 5 Sep 2026 19:39:05 -0700 Message-Id: <20260906023905.2517725-1-brian.cain@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-hexagon@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA2MDAyNSBTYWx0ZWRfX5pU9mniyyBrV FyRPi6ZE/Q7FRazeRYjY1RP0qMsLACfzzB6BMCpwO2D/5X84kVpe/GAZyjxGrV1KbgHxz2ZXSzw mreaL2fbzS3o0EEIHl5OIEkwn1FViGQ= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTA2MDAyNSBTYWx0ZWRfX9uPsQcbYyvzF rlyS9P+BEkOftwBxLMwdNsg8r6e2aSPtc2ebse+TfYakxAGF06gcXG1paqcQqRlW4TaULfEVA6z klBXTkfmZ+sG/akgKwk0AObZEpaa2I2sHWN7+/7agqWu9We6aVO1W01usgvBt345oi1ffjf/q+E aEEOCN22kYcatbDyli3umxN+nuBxplCLsP3ck0SSArcUjEAET4firszxso3a/RON7GGsSMGzvcP Oam8OnUzeVF35EMJNjMwwGPmSUMq8nw4ccKsKjrbHQBMtM2ylQIFu7Nu9ixWRF/kfVPSRIxO1CK RHTBLVUmmCK6rVc2MZkJfY3QCHm9STMOsV53EQOjBnF6ubYTjyZKRxBJWo3LWT/QEp/FJxrITQX 4htAytJuFYCcqQlIOhYeVoYithYZqGICz0Wtt01fb0G/VyjltFsjafGA+PxGS1z9xqcEQIHsiGV MW4DXfm0P8nvpas1IDA== X-Authority-Analysis: v=2.4 cv=UIjt2ify c=1 sm=1 tr=0 ts=6a9cd24c cx=c_pps a=MTSHoo12Qbhz2p7MsH1ifg==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=JfrnYn6hAAAA:8 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=K8hMu20Jjl3dzlJuOMsA:9 a=QEXdDO2ut3YA:10 a=GvdueXVYPmCkWapjIL-Q:22 a=1CNFftbPRP8L7MoqJWF3:22 X-Proofpoint-GUID: nqGj0gUIiHDzI9VmSgp24PzChRWXuXU8 X-Proofpoint-ORIG-GUID: nqGj0gUIiHDzI9VmSgp24PzChRWXuXU8 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-05_08,2026-09-03_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 phishscore=0 clxscore=1015 spamscore=0 suspectscore=0 malwarescore=0 lowpriorityscore=0 impostorscore=0 bulkscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609060025 Consumers walking call_single_queue cast each node to call_single_data_t and, given that type's declared over-alignment, the compiler may load llist.next and u_flags as one naturally aligned double word. Embedders such as task_struct::wake_entry only guarantee pointer alignment, which faults on strict-alignment 32-bit architectures like hexagon. Cc: Peter Zijlstra Cc: Ingo Molnar Cc: "Paul E. McKenney" Cc: Frederic Weisbecker Cc: linux-hexagon@vger.kernel.org Signed-off-by: Brian Cain --- include/linux/smp_types.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/smp_types.h b/include/linux/smp_types.h index 2e8461af8df6..5773e1fb2660 100644 --- a/include/linux/smp_types.h +++ b/include/linux/smp_types.h @@ -64,6 +64,6 @@ struct __call_single_node { #ifdef CONFIG_64BIT u16 src, dst; #endif -}; +} __aligned(8); #endif /* __LINUX_SMP_TYPES_H */ -- 2.34.1