linux-kernel - Re: [PATCH v3] MIPS: mm: kmalloc tlb

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Message-ID: <alpine.DEB.2.21.2511280554370.36486@angie.orcam.me.uk>
Date: Fri, 28 Nov 2025 05:57:41 +0000 (GMT)
From: "Maciej W. Rozycki" <macro@...am.me.uk>
To: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
cc: Jiaxun Yang <jiaxun.yang@...goat.com>, 
    Gregory CLEMENT <gregory.clement@...tlin.com>, linux-mips@...r.kernel.org, 
    linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] MIPS: mm: kmalloc tlb_vpn array to avoid stack
 overflow

On Thu, 27 Nov 2025, Maciej W. Rozycki wrote:

> From: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> 
> Owing to Config4.MMUSizeExt and VTLB/FTLB MMU features later MIPSr2+ 
> cores can have more than 64 TLB entries.  Therefore allocate an array 
> for uniquification instead of placing too small an array on the stack.
> 
> Signed-off-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> Signed-off-by: Maciej W. Rozycki <macro@...am.me.uk>
> Fixes: 9f048fa48740 ("MIPS: mm: Prevent a TLB shutdown on initial uniquification")
> Cc: stable@...r.kernel.org
> ---

 Please scrap this version.  I've sent v4 with tags updates as I didn't 
realise stable backports haven't been pushed yet.  So this will best be 
sorted with a cherry-pick tag meaning no regression in the stable trees 
except for the single place between the two consecutive commits.

  Maciej