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AJvYcCVPjsXOE8vQezbY4L0uwCuj+V2dym6btRV+wjlGBp4XhmRj1BaKViwa2X+5QF3MvsiOSgQMtisoJA==@kvack.org X-Gm-Message-State: AOJu0YxsSgsMeGaZekxwswsr4tAYtfT7g0FJO4B5a9RwxlBG9b9YHQGu AO1uUjEZsSjIIsyLwzCDtYvGtfC0BxwrLTV7Cy4q4FEvdxKH6RQsiU4no7rSoiA1+vNtQ6Pd8va PIXnPL3b4pHAhoG82sTHynl6ZXPIBx9vYmMtJq8MnTw== X-Gm-Gg: ASbGncuRFl3BAaAbMKslJnuxizqvT4nWnnCYUei5U4c39juIjSs0ahDJ3RiKsqklr4k ILuAsqLMi/R01XACk9EuYGcf/3Xw+k+DVkuv70ghWRXQdc/ibGj1b69cyqd6RfdNKONlFaEXe2k /64KkWNuYgcr5ZmL3U8xbOXd9aN0ZUgsweLR2zLtqgQy/bmmz/0r/ymhQ5erDjqDeGGF3CF5Eho 96WSxhmm2wdio4KrknvnN0Lbnm+lmkgvT0= X-Google-Smtp-Source: AGHT+IGlilblub0beLftAWMWI936Ykgkb7W6amQCxE7/3U6ErRHHtfFsJXaGAy/lTybsJEEc8106tAh730j5a9SzDJ0= X-Received: by 2002:a17:907:97ca:b0:ade:7c6:498a with SMTP id a640c23a62f3a-afe28f767a7mr1748711666b.10.1756289625193; Wed, 27 Aug 2025 03:13:45 -0700 (PDT) MIME-Version: 1.0 References: <20250826231626.218675-1-max.kellermann@ionos.com> <20250826185515.7fbe1821713195b170ac1b31@linux-foundation.org> In-Reply-To: From: Max Kellermann Date: Wed, 27 Aug 2025 12:13:34 +0200 X-Gm-Features: Ac12FXyu44OsYHZBPwR3H1LV2YZSl9vQxc7lNHNMlVr67uXAXYPJVZpR4sRqqmo Message-ID: Subject: Re: [PATCH 1/2] huge_mm.h: is_huge_zero_folio(NULL) should return false To: David Hildenbrand Cc: Andrew Morton , lorenzo.stoakes@oracle.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, Liam.Howlett@oracle.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, shikemeng@huaweicloud.com, kasong@tencent.com, nphamcs@gmail.com, bhe@redhat.com, chrisl@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: DD773180008 X-Stat-Signature: px5hiz4kmj3goesoa3b38gbqy4cqn79o X-Rspam-User: X-HE-Tag: 1756289626-559527 X-HE-Meta: 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 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 Wed, Aug 27, 2025 at 11:36=E2=80=AFAM David Hildenbrand wrote: > Why should it be allowed to pass in garbage (folio =3D=3D NULL) into a > function that operates on valid folios? This patch isn't about the function parameter but about the global variable being NULL. (Don't mix up with my other patch.)