linux-kernel - Re: [PATCH] percpu: add basic double free check

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Message-ID: <20260112160321.kCh3NHWV@linutronix.de>
Date: Mon, 12 Jan 2026 17:03:21 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Dennis Zhou <dennis@...nel.org>
Cc: Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] percpu: add basic double free check

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