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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-kernel@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-ORIG-GUID: 1iALfwDj--qFLrsxz06U_yx_8Jev-sWB X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTA2MDAyNSBTYWx0ZWRfX38c0zLUwQybF 1b9ZRPdxKzAqPMU9CnuCv04wFBzM6zUOCXgq/VeAeA+FwEXxST9Vz8YhGYOVNGjGebvcX+RlXOC CX40CJzNWGD5u/41VqQDzPfUpRgiukLTLPbXkYfvSoA1tX+O0sYLwlHYT3+2OUqYMiq3QaB3AHR +9nOt2Mtd0crTLPwXw/0g8QcPLP40YRcTkC2csqWG7MgMy+BEaCF6odt/u5rpuZRHxJ53MLUwdi Q2me8xGQz97lzt+ZN3oxLUE7hiNkREvwku6+Phn2AULHLYcwyJsvy0fYQradN3n3F8JAXmWRGQb OydVoT+qbttvLGMdz8flHUlJ/ROEa2n98qp6qEogiry/La0ms9Kv0IQvKSYOqfkqaouVy0Ppc96 WyYh57gn9p1iCOmI6rzZXZ/tNsC9SaOGLGVO2lcnV8yXJUjgHFX/kNqB+PQrFXVNSMToOPHFg7U 1dkwXv8Bp5bwxEydR+g== X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA2MDAyNSBTYWx0ZWRfX1+4Dn20RtfAH dM1OnW6XpZH4dO9aq3MMc4xdT0h86qw17FJOWH3s/Aek/tDvdy9okVrAQWjtE81NXkGCZVlU1b9 aHN3yicQekjlxnB179etS4vIQTjTFlA= X-Authority-Analysis: v=2.4 cv=OceoyBTY c=1 sm=1 tr=0 ts=6a9cd24c cx=c_pps a=oF/VQ+ItUULfLr/lQ2/icg==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=JfrnYn6hAAAA:8 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=K8hMu20Jjl3dzlJuOMsA:9 a=QEXdDO2ut3YA:10 a=3WC7DwWrALyhR5TkjVHa:22 a=1CNFftbPRP8L7MoqJWF3:22 X-Proofpoint-GUID: 1iALfwDj--qFLrsxz06U_yx_8Jev-sWB 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 lowpriorityscore=0 bulkscore=0 priorityscore=1501 suspectscore=0 phishscore=0 malwarescore=0 impostorscore=0 adultscore=0 spamscore=0 clxscore=1015 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