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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4886848646dsm7043804f8f.10.2026.09.23.08.43.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Sep 2026 08:43:11 -0700 (PDT) From: Brian Cain To: linux-kernel@vger.kernel.org Cc: pierrick.bouvier@oss.qualcomm.com, paulmck@kernel.org, sid.manning@oss.qualcomm.com, peterz@infradead.org, linux-hexagon@vger.kernel.org, Brian Cain , Ingo Molnar , Frederic Weisbecker , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PATCH v2] smp: align struct __call_single_node to 8 bytes Date: Wed, 23 Sep 2026 08:43:07 -0700 Message-Id: <20260923154307.3625611-1-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-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Proofpoint-Spam-Info: AW1haW4tMjYwOTIzMDA2MiBTYWx0ZWRfX1xh3jIRoR5bf c0f9D/OOqwQobkbFrlqAQscEU6hNp2FqP36rfZclXl014osgU/r7axLTvQvPEsi70LLDt4W9x5H mihS8xluPNWoFG8+3TB0NwvxHAyjc60= X-Proofpoint-GUID: rYb33qhKYludRwo8OnlenB5sYxCDeN16 X-Authority-Analysis: v=2.4 cv=RYMFmFtv c=1 sm=1 tr=0 ts=6ab3f391 cx=c_pps a=P2rfLEam3zuxRRdjJWA2cw==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=JfrnYn6hAAAA:8 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=IZicBOMgkkpEp8HIunUA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=ODZdjJIeia2B_SHc_B0f:22 a=1CNFftbPRP8L7MoqJWF3:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTIzMDA2MiBTYWx0ZWRfX8GV0coT4jeF7 jdgW+wU230r66Vjiq9FI+ZuJbNL+5etJG8EVlOWa+nHjzomUGDLRs0RuEmcs+QAL6ssK9aOYKL1 vUtXyT19xalGdGSGwO1dvB/EMpwEqWfnx4y2TIDsKhFzzM0ZljBXwX6UFN/rnaFgBdSssIPWPNd xXwArOE0v32I8ZDQXgC0xtEQqkZxNewef/mTJOGHV4fiOT/ri5Wv0omWcziwF7nAGVgepBTaezw gCj7oCAaTb3ok8Qks6BKjeiaQPUiwaVk8GAY8QwP7uDKRvrcW/PTKrR2qLo3ru1huJ+CV73GN1K 1Ho8m2Ds6c/5rIslumCwA61ejEpjfzn9H/O8tTd/xJUwIfXoO1OoNmBQBkEyY84hu/bla6LHUYY wmDGPOq4ZOyP2XYcWVT+GwdHU7gmp201zXMZ802d10ufU+RnvlgeO7m2cw5eU/+sJr8jt5ktvgz CeREiwbSL8CmI3EjLZQ== X-Proofpoint-ORIG-GUID: rYb33qhKYludRwo8OnlenB5sYxCDeN16 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=2026-09-23_04,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 clxscore=1015 priorityscore=1501 phishscore=0 adultscore=0 impostorscore=0 lowpriorityscore=0 bulkscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609230062 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. Fields using this type, 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 Reviewed-by: Philippe Mathieu-Daud=C3=A9 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); =20 #endif /* __LINUX_SMP_TYPES_H */ --=20 2.34.1