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bh=you+Prysa3+e+CjaYB+FaeigBAe5mJGLl/kBRCHGxe4=; b=bu1YsJAyHq5GsJ+D43WKjuvJejHEqCmG/Q6DNilgYOrnpnfZmXCDkMvM9LWKBaGFjoP86n bjtbneiqjEkUZHjFoyE/maii+z8fYRjV6alYjvVu9gtGUWzj3uKLgyzjdHsBPsUc1SulbM ZXfb0gqX0YtXwnLDLVSvOUO5qK6BR6ggDi1xFA6cDXrqn6Ttwj3X47ciccusS723ECQ5az 0qWHko+jTSHXdz03dSqPxjbtb5GB3k4Hn8OzLynOFbUXOLoCne4Dp/BZ88cCCrL5bLWxBI Vcr0bPWNqdT8m3M+fHIDagcsxYf5pcFCI2SrQNtMuv8st4rn7iXtrrV8SdBT0A== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1768233802; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=you+Prysa3+e+CjaYB+FaeigBAe5mJGLl/kBRCHGxe4=; b=9WFRO/Jfmaus/17npdGjbfulZllUah41yftAdCLefQ7UwtrMYu+fHVUzlDUlfq2FvsVYVf LCB3AiNfHkvkGmCA== From: Sebastian Andrzej Siewior To: Dennis Zhou Cc: Tejun Heo , Christoph Lameter , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] percpu: add basic double free check Message-ID: <20260112160321.kCh3NHWV@linutronix.de> References: <20251220002737.84100-1-dennis@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20251220002737.84100-1-dennis@kernel.org> X-Stat-Signature: u8itso16c6t9g7yc9q4byzqt5ex47uon X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 006B480012 X-Rspam-User: X-HE-Tag: 1768233804-386 X-HE-Meta: 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 SB7g4vmG 6wQ+SdgCq079vzNLoPHo6GhvbUW0EHnmyhuA0vUdPoa53D78Qo3R5vEcrmOFwmkDzdBalpe0NTkRvKKw1hBOY//GVRlR8xGkl9sy89rSY+HYqmcG+9z5BBJYIxMBz7dydipJATti0YwqFQaL4HG7eZUJK7Ur5NLsRVD/Yek5s5wWtDosr5FLt7c8Dctg0e/C38sO7yBqvkiqxAC7gqEURflL+lQB33Cj/+t/Ld4Dww9R5Cpw= 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 2025-12-19 16:27:37 [-0800], Dennis Zhou wrote: > This adds a basic double free check by validating the first bit of the > allocation in alloc_map and bound_map are set. If the alloc_map bit is > not set, then this means the area is currently unallocated. If the > bound_map bit is not set, then we are not freeing from the beginning of > the allocation. > > This is a respin of [1] adding the requested changes from me and > Christoph. Thank you. > [1] https://lore.kernel.org/linux-mm/20250904143514.Yk6Ap-jy@linutronix.de/ > Sebastian