From: "Arnd Bergmann" <arnd@arndb.de>
To: "Sasha Levin" <sashal@kernel.org>,
"Peter Zijlstra" <peterz@infradead.org>
Cc: "kernel test robot" <yi1.lai@intel.com>,
oe-lkp@lists.linux.dev, "kernel test robot" <lkp@intel.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
"Andrew Morton" <akpm@linux-foundation.org>,
"David Hildenbrand (Red Hat)" <david@kernel.org>,
"Liam R. Howlett" <liam@infradead.org>,
"Kirill A. Shutemov" <kas@kernel.org>,
"Finn Thain" <fthain@linux-m68k.org>,
"Geert Uytterhoeven" <geert@linux-m68k.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
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Subject: Re: [linus:master] [atomic] 80047d84ee: WARNING:at_include/linux/instrumented.h:#__split_huge_pmd_locked
Date: Tue, 03 Nov 2026 14:13:10 +0100 [thread overview]
Message-ID: <e69e6690-cfc0-4ea8-83e1-5ad2d98b84d5@app.fastmail.com> (raw)
In-Reply-To: <20261103123508.3910990-1-sashal@kernel.org>
On Tue, Nov 3, 2026, at 13:35, Sasha Levin wrote:
>
> I tried the typedef change. It works, but gcc ends up realigning the
> stack in a lot of pte/pmd code (126 more functions with Arnd's version
> in a small config, 204 with yours), including handle_mm_fault(). Just
> aligning the two locals seems simpler:
The question is how many of the other functions may be affected by the
same bug. I see a variation of the same code in vmemmap_split_pmd(),
and aligning the types is clearly the safer option here, especially
given that most 32-bit architectures already align u64 all the time
the same way that 64-bit ones do.
Arnd
next prev parent reply other threads:[~2026-11-03 13:14 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-03 0:58 kernel test robot
2026-11-03 9:46 ` Finn Thain
2026-11-03 12:18 ` Arnd Bergmann
2026-11-03 12:26 ` Peter Zijlstra
2026-11-03 12:35 ` Sasha Levin
2026-11-03 12:56 ` Peter Zijlstra
2026-11-03 13:13 ` Arnd Bergmann [this message]
2026-11-03 13:41 ` Arnd Bergmann
2026-11-03 14:52 ` Peter Zijlstra
2026-11-03 15:43 ` Andrew Morton
2026-11-03 15:58 ` David Hildenbrand (Arm)
2026-11-03 16:29 ` Dave Hansen
2026-11-03 16:51 ` Arnd Bergmann
2026-11-03 18:30 ` Dave Hansen
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