linux-kernel - Re: [PATCH] riscv: Don't use hugepage mappings for vmemmap if it's not supported

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Message-ID: <20240508184641.WP8ok_Hg@linutronix.de>
Date: Wed, 8 May 2024 20:46:49 +0200
From: Nam Cao <namcao@...utronix.de>
To: Alexandre Ghiti <alex@...ti.fr>
Cc: Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] riscv: Don't use hugepage mappings for vmemmap if it's
 not supported

On Wed, May 08, 2024 at 08:22:43PM +0200, Alexandre Ghiti wrote:
> Hi Nam,
Hi Alex,

> > Commit ff172d4818ad ("riscv: Use hugepage mappings for vmemmap") broke XIP
> > kernel, because huge pages are not supported on XIP kernel.
> 
> I don't understand why XIP kernels can't support huge vmalloc mappings,

Me neither.

> so I
> think the right fix would be to enable such mappings on XIP. WDYT?

I agree that is the ideal solution. But I don't want to send any new
feature to the stable trees (stable folks may even reject such patch).
So I intend that to be in another patch.

Best regards,
Nam