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From: Kent Overstreet To: Matthew Wilcox Cc: Kefeng Wang , Andrew Morton , David Hildenbrand , Hyeonggon Yoo <42.hyeyoo@gmail.com>, linux-mm@kvack.org Subject: Re: [PATCH 3/4] mm: Support only one page_type per page Message-ID: References: <20240821173914.2270383-1-willy@infradead.org> <20240821173914.2270383-4-willy@infradead.org> <2d19c48a-c550-4345-bf36-d05cd303c5de@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Migadu-Flow: FLOW_OUT X-Stat-Signature: 199nk4zrhknq8kih5txng7gcbyctoe9x X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 4B59E40002 X-Rspam-User: X-HE-Tag: 1754016588-436718 X-HE-Meta: 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 m5sUDbEU emwdZrX0tNK2XPgiAqO2yEmXgAWos22MnQTJzjkfR3chbgrUxmiAX0NibAewDtLy0yhKvDaeNS+2Wa01qJp6tabuo3lcZIRWn9/UJC1sO+Mh6CgGNZB4Z815flskfjL7+8xpAwe/CjY0Il0jw4llRsRVUdPGgSrYRCcy2FfcKEh9hR4l769zmSYE201PzzctEggRRYtoLv7IIJ09/zv0EXlU7pN+tPMvNCSYLF5txI/QcewZJcoFD6f3Pf4bodYmN6kwIRPbxbdH7HJVSiraROfMJ3v+ekLVyAmx+G3oUgelnwJelzN8SZyeaOSFmlZyDwm7l X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Aug 01, 2025 at 03:43:47AM +0100, Matthew Wilcox wrote: > On Wed, Aug 28, 2024 at 11:35:28AM +0800, Kefeng Wang wrote: > > There are some UBSAN warning about __folio_set_##fname/__SetPage##uname, > > > > UBSAN: shift-out-of-bounds in ../include/linux/page-flags.h:998:1 > > left shift of 240 by 24 places cannot be represented in type 'int' > > I can't reproduce this. I know Andrew merged this patch in, but I > tried backing it out and enabling UBSAN and it doesn't show up for me. > Relevant part of .config: > > CONFIG_ARCH_HAS_UBSAN=y > CONFIG_UBSAN=y > CONFIG_UBSAN_TRAP=y > CONFIG_CC_HAS_UBSAN_BOUNDS_STRICT=y > CONFIG_UBSAN_BOUNDS=y > CONFIG_UBSAN_BOUNDS_STRICT=y > CONFIG_UBSAN_SHIFT=y > # CONFIG_UBSAN_DIV_ZERO is not set > CONFIG_UBSAN_BOOL=y > CONFIG_UBSAN_ENUM=y > # CONFIG_TEST_UBSAN is not set > > (I tried CONFIG_UBSAN_TRAP both on and off) It's an integer promotion bug, so arch dependent?