linux-kernel - Re: [PATCH RFC v3 01/35] mm: page_alloc: Add gfp_flags parameter to arch_alloc

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Date: Tue, 30 Jan 2024 11:56:31 +0000
From: Alexandru Elisei <alexandru.elisei@....com>
To: Anshuman Khandual <anshuman.khandual@....com>
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Subject: Re: [PATCH RFC v3 01/35] mm: page_alloc: Add gfp_flags parameter to
 arch_alloc_page()

Hi,

On Tue, Jan 30, 2024 at 09:56:10AM +0530, Anshuman Khandual wrote:
> 
> 
> On 1/29/24 17:11, Alexandru Elisei wrote:
> > Hi,
> > 
> > On Mon, Jan 29, 2024 at 11:18:59AM +0530, Anshuman Khandual wrote:
> >> On 1/25/24 22:12, Alexandru Elisei wrote:
> >>> Extend the usefulness of arch_alloc_page() by adding the gfp_flags
> >>> parameter.
> >> Although the change here is harmless in itself, it will definitely benefit
> >> from some additional context explaining the rationale, taking into account
> >> why-how arch_alloc_page() got added particularly for s390 platform and how
> >> it's going to be used in the present proposal.
> > arm64 will use it to reserve tag storage if the caller requested a tagged
> > page. Right now that means that __GFP_ZEROTAGS is set in the gfp mask, but
> > I'll rename it to __GFP_TAGGED in patch #18 ("arm64: mte: Rename
> > __GFP_ZEROTAGS to __GFP_TAGGED") [1].
> > 
> > [1] https://lore.kernel.org/lkml/20240125164256.4147-19-alexandru.elisei@arm.com/
> 
> Makes sense, but please do update the commit message explaining how
> new gfp mask argument will be used to detect tagged page allocation
> requests, further requiring tag storage allocation.

Will do, thanks!

Alex