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Tue, 3 Nov 2026 11:51:21 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 X-ThreadId: AHCvEt5753PB Date: Tue, 03 Nov 2026 17:51:00 +0100 From: "Arnd Bergmann" To: "Dave Hansen" , "Andrew Morton" , "Peter Zijlstra" Cc: "kernel test robot" , oe-lkp@lists.linux.dev, "kernel test robot" , linux-kernel@vger.kernel.org, "Finn Thain" , "Geert Uytterhoeven" , "Sasha Levin" , "Thomas Gleixner" , "Ingo Molnar" , "Borislav Petkov" , "Dave Hansen" , "Ard Biesheuvel" , "H. Peter Anvin" , "Alexei Starovoitov" , "Andrii Nakryiko" , "Boqun Feng" , "Daniel Borkmann" , "Dinh Nguyen" , "Eduard Zingerman" , "Gary Guo" , guoren , "Hao Luo" , "Jiri Olsa" , "John Fastabend" , "John Paul Adrian Glaubitz" , "Jonas Bonn" , "KP Singh" , "Mark Rutland" , "Martin KaFai Lau" , "Rich Felker" , "Song Liu" , "Stafford Horne" , "Stanislav Fomichev" , "Stefan Kristiansson" , "Will Deacon" , "Yonghong Song" , "Yoshinori Sato" , "David Hildenbrand (Red Hat)" , "Liam R. Howlett" , "Kirill A. Shutemov" Message-Id: In-Reply-To: <3bf3f477-a048-457b-8032-43d8d1451e9e@intel.com> References: <202611022259.def3e086-lkp@intel.com> <20261103122647.GL1813469@noisy.programming.kicks-ass.net> <20261103074305.27bfc570fb81346860867bdc@linux-foundation.org> <3bf3f477-a048-457b-8032-43d8d1451e9e@intel.com> Subject: Re: [linus:master] [atomic] 80047d84ee: WARNING:at_include/linux/instrumented.h:#__split_huge_pmd_locked Content-Type: text/plain Content-Transfer-Encoding: 7bit On Tue, Nov 3, 2026, at 17:29, Dave Hansen wrote: > On 11/3/26 07:43, Andrew Morton wrote: > > Heh, same code. Same basic problem. Two different detectors firing. > > But I also kinda feel like shooting the messenger on this one. The > warnings are presumably to help us with performance problems. This is > old, legacy code that nobody cares about running fast. So they're not > actually helpful here. I don't think it's the craziest thing, at least > on x86_32, to just turn the warnings off. > > Also, if there are plans to get all the pmd_t's off the stack, maybe we > should just manually align them for now. I would still prefer to align the types than the objects, if only for the reason that the interfaces that operate on the type clearly expect it to be aligned. > It wouldn't hurt to make the definitions uglier like: > > #define pxx_xchg64(_pxx, _ptr, _val) ({ > _pxx##val_t *_p = (_pxx##val_t *)_ptr; > - _pxx##val_t _o = *_p; > + _pxx##val_t _o __aligned(sizeof(_pxx##val_t)) = *_p; > do { } while (!try_cmpxchg64(_p, &_o, (_val))); > native_make_##_pxx(_o); > }) I initially misread the code the same way. However, the warning here is about _p being misaligned, not &_o, so Sasha's patch would be the one that aligns the objects. Arnd