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b=Ly53+/g7GMKrioxrpvJKQ30gqvhpgJ/NdJQ7qcRscTsNHlxgdg4WEB2L9LgRliowd w+NGXbw+kK3vzBPhrespO4uxHBuegqjslVshEnpEaPuYiatuUmgE4iZ4AIWo7PYn/x uS5OSYJ0KJKkKvBK6Qnhfn1GZslHwCGR6/fzUvRb98D3xXlEFdfgK5BCEZOpnJI9X8 UYONAGVvGiKzO2T3b6A09yd1f81uRAKpSKqgXF+JocsuxmuW+zUcjFBEvUGz8YqB2r o0OwySAR3zU6N8doTj/MqORWAa7sKhWS7myvc+ga7O7KgYBUaS8sL1Yz4tdr2HfJQB T1K634E3AjC3A== Message-ID: Date: Tue, 27 Jan 2026 11:29:58 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm: folio_zero_user: open code range computation in folio_zero_user() To: Ankur Arora , linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org Cc: akpm@linux-foundation.org, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, mingo@redhat.com, mjguzik@gmail.com, luto@kernel.org, peterz@infradead.org, tglx@linutronix.de, willy@infradead.org, raghavendra.kt@amd.com, chleroy@kernel.org, ioworker0@gmail.com, lizhe.67@bytedance.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com, kernel test robot References: <20260107072009.1615991-9-ankur.a.arora@oracle.com> <20260126183212.2366596-1-ankur.a.arora@oracle.com> From: "David Hildenbrand (Red Hat)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam11 X-Stat-Signature: ffx5n8dyr6tthcbiqc5w9g76ga8z7pwm X-Rspam-User: X-Rspamd-Queue-Id: 6475C40013 X-HE-Tag: 1769509807-712145 X-HE-Meta: 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 Q774iZ29 mnEBYpe3UaUSiiU/ta7Mk+C+BuE4L9RexMuySPo+5pMHbWmakJoPIrcjDn9zehpo1ZHVJBDlYKZf/lEeuqRrKRR3FiFpdSz95wVkxM1/CmkTM3ReaMgGqdGzswyGdTI5gFVEUKtsgmbh4FCrlZLcNwjo5DAQl9EXzE0IUzVr7z1LZcsJaqFJo5qUZ/dzNicxETfRQz5ZZy3DGvHAtf62Fo+5Adjlij8TVWgVGLSMq3OkRBCq3wBtFXHeVhiDeQ1Yv3xYfDYJvXYZY0l5ya4E447nTKb8f2iCwzYyflPEwMrs5OgHbFpf3XTwXrcodHQuqFCBLBqxBHHuDk/FVw1ieowhk5XLDH8zkttdMHHYh7PEUTJKDqoCTgJjP1A== 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 1/26/26 19:32, Ankur Arora wrote: > riscv64-gcc-linux-gnu (v8.5) reports a compile time assert in: > > r[2] = DEFINE_RANGE(clamp_t(s64, fault_idx - radius, pg.start, pg.end), > clamp_t(s64, fault_idx + radius, pg.start, pg.end)); > > where it decides that pg.start > pg.end in: > clamp_t(s64, fault_idx + radius, pg.start, pg.end)); > > where pg comes from: > const struct range pg = DEFINE_RANGE(0, folio_nr_pages(folio) - 1); > > That does not seem like it could be true. Even for pg.start == pg.end, > we would need folio_test_large() to evaluate to false at compile time: > > static inline unsigned long folio_nr_pages(const struct folio *folio) > { > if (!folio_test_large(folio)) > return 1; > return folio_large_nr_pages(folio); > } > > Workaround by open coding the range computation. Also, simplify the type > declarations for the relevant variables. > > Reported-by: kernel test robot > Closes: https://lore.kernel.org/oe-kbuild-all/202601240453.QCjgGdJa-lkp@intel.com/ > Signed-off-by: Ankur Arora > --- > > Hi Andrew > > I'm not certain about linux-next rebasing protocol, but I'm guessing > this patch will be squashed in patch-8 ("mm: folio_zero_user: cache > neighbouring pages"). > > The commit message doesn't contain anything needing preserving if it is. > > Thanks > Ankur > > mm/memory.c | 23 +++++++++++------------ > 1 file changed, 11 insertions(+), 12 deletions(-) > > diff --git a/mm/memory.c b/mm/memory.c > index ce933ee4a3dd..e49340f51fa9 100644 > --- a/mm/memory.c > +++ b/mm/memory.c > @@ -7282,30 +7282,29 @@ static void clear_contig_highpages(struct page *page, unsigned long addr, > void folio_zero_user(struct folio *folio, unsigned long addr_hint) > { > const unsigned long base_addr = ALIGN_DOWN(addr_hint, folio_size(folio)); > - const long fault_idx = (addr_hint - base_addr) / PAGE_SIZE; > const struct range pg = DEFINE_RANGE(0, folio_nr_pages(folio) - 1); > - const int radius = FOLIO_ZERO_LOCALITY_RADIUS; > + const long fault_idx = (addr_hint - base_addr) / PAGE_SIZE; > + const long radius = FOLIO_ZERO_LOCALITY_RADIUS; > struct range r[3]; > int i; > > /* > - * Faulting page and its immediate neighbourhood. Will be cleared at the > - * end to keep its cachelines hot. > + * Faulting page and its immediate neighbourhood. Cleared at the end to > + * keep its cachelines hot. > */ Why are there rather unrelated changes in this patch? Like this comment change, or the movement of "fualt_idx" declaration above? -- Cheers David