linux-kernel - Re: [PATCH v4] MIPS: mm: kmalloc tlb

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Message-ID: <alpine.DEB.2.21.2511281656510.36486@angie.orcam.me.uk>
Date: Fri, 28 Nov 2025 16:57:14 +0000 (GMT)
From: "Maciej W. Rozycki" <macro@...am.me.uk>
To: Klara Modin <klarasmodin@...il.com>
cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
    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 v4] MIPS: mm: kmalloc tlb_vpn array to avoid stack
 overflow

On Fri, 28 Nov 2025, Klara Modin wrote:

> > 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.
> > 
> > Fixes: 35ad7e181541 ("MIPS: mm: tlb-r4k: Uniquify TLB entries on init")
> > Co-developed-by: Maciej W. Rozycki <macro@...am.me.uk>
> > Signed-off-by: Maciej W. Rozycki <macro@...am.me.uk>
> > Signed-off-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> > Cc: stable@...r.kernel.org # v6.17+: 9f048fa48740: MIPS: mm: Prevent a TLB shutdown on initial uniquification
> > Cc: stable@...r.kernel.org # v6.17+
> 
> This fixes a boot failure on my Edgerouter 6P (Cavium Octeon III).

 Thank you for verification.

  Maciej