netdev - Re: [PATCH net v2] page_pool: Fix PP_MAGIC_MASK to avoid crashing on some 32-bit arches

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Message-Id: 
 <175978287125.1522677.13468458175773865166.git-patchwork-notify@kernel.org>
Date: Mon, 06 Oct 2025 20:34:31 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Toke Høiland-Jørgensen <toke@...hat.com>@codeaurora.org
Cc: akpm@...ux-foundation.org, david@...hat.com, lorenzo.stoakes@...cle.com,
 Liam.Howlett@...cle.com, vbabka@...e.cz, rppt@...nel.org, surenb@...gle.com,
 mhocko@...e.com, hawk@...nel.org, ilias.apalodimas@...aro.org,
 kuba@...nel.org, almasrymina@...gle.com, stable@...r.kernel.org,
 deller@....de, davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
 horms@...nel.org, linux-mm@...ck.org, netdev@...r.kernel.org
Subject: Re: [PATCH net v2] page_pool: Fix PP_MAGIC_MASK to avoid crashing on
 some
 32-bit arches

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@...nel.org>:

On Tue, 30 Sep 2025 13:43:29 +0200 you wrote:
> Helge reported that the introduction of PP_MAGIC_MASK let to crashes on
> boot on his 32-bit parisc machine. The cause of this is the mask is set
> too wide, so the page_pool_page_is_pp() incurs false positives which
> crashes the machine.
> 
> Just disabling the check in page_pool_is_pp() will lead to the page_pool
> code itself malfunctioning; so instead of doing this, this patch changes
> the define for PP_DMA_INDEX_BITS to avoid mistaking arbitrary kernel
> pointers for page_pool-tagged pages.
> 
> [...]

Here is the summary with links:
  - [net,v2] page_pool: Fix PP_MAGIC_MASK to avoid crashing on some 32-bit arches
    https://git.kernel.org/netdev/net/c/95920c2ed02b

You are awesome, thank you!
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