linux-kernel - Re: [PATCH v3 1/2] kho: add support for preserving vmalloc allocations

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Message-ID: <20250908181817.GG789684@nvidia.com>
Date: Mon, 8 Sep 2025 15:18:17 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Pratyush Yadav <pratyush@...nel.org>
Cc: Mike Rapoport <rppt@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Graf <graf@...zon.com>, Baoquan He <bhe@...hat.com>,
	Changyuan Lyu <changyuanl@...gle.com>, Chris Li <chrisl@...nel.org>,
	Pasha Tatashin <pasha.tatashin@...een.com>,
	kexec@...ts.infradead.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] kho: add support for preserving vmalloc
 allocations

On Mon, Sep 08, 2025 at 08:12:59PM +0200, Pratyush Yadav wrote:
> > +#define KHO_VMALLOC_FLAGS_MASK	(VM_ALLOC | VM_ALLOW_HUGE_VMAP)
> 
> I don't think it is a good idea to re-use VM flags. This can make adding
> more flags later down the line ugly. I think it would be better to
> define KHO_VMALLOC_FL* instead.

+1

This kind of stuff should be avoided, it becomes a very sneaky ABI.

Jason