linux-kernel - Re: [PATCH v1 20/36] mips: mm: convert __flush_dcache_pages() to __flush_dcache_folio

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Message-ID: <e877229a-ffd8-4459-a31b-ecabde28e07f@redhat.com>
Date: Fri, 29 Aug 2025 15:44:20 +0200
From: David Hildenbrand <david@...hat.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: linux-kernel@...r.kernel.org,
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
 Alexander Potapenko <glider@...gle.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Brendan Jackman <jackmanb@...gle.com>, Christoph Lameter <cl@...two.org>,
 Dennis Zhou <dennis@...nel.org>, Dmitry Vyukov <dvyukov@...gle.com>,
 dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
 iommu@...ts.linux.dev, io-uring@...r.kernel.org,
 Jason Gunthorpe <jgg@...dia.com>, Jens Axboe <axboe@...nel.dk>,
 Johannes Weiner <hannes@...xchg.org>, John Hubbard <jhubbard@...dia.com>,
 kasan-dev@...glegroups.com, kvm@...r.kernel.org,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>, linux-arm-kernel@...s.com,
 linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
 linux-ide@...r.kernel.org, linux-kselftest@...r.kernel.org,
 linux-mips@...r.kernel.org, linux-mmc@...r.kernel.org, linux-mm@...ck.org,
 linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
 linux-scsi@...r.kernel.org, Marco Elver <elver@...gle.com>,
 Marek Szyprowski <m.szyprowski@...sung.com>, Michal Hocko <mhocko@...e.com>,
 Mike Rapoport <rppt@...nel.org>, Muchun Song <muchun.song@...ux.dev>,
 netdev@...r.kernel.org, Oscar Salvador <osalvador@...e.de>,
 Peter Xu <peterx@...hat.com>, Robin Murphy <robin.murphy@....com>,
 Suren Baghdasaryan <surenb@...gle.com>, Tejun Heo <tj@...nel.org>,
 virtualization@...ts.linux.dev, Vlastimil Babka <vbabka@...e.cz>,
 wireguard@...ts.zx2c4.com, x86@...nel.org, Zi Yan <ziy@...dia.com>
Subject: Re: [PATCH v1 20/36] mips: mm: convert __flush_dcache_pages() to
 __flush_dcache_folio_pages()

On 29.08.25 14:51, Lorenzo Stoakes wrote:
> On Thu, Aug 28, 2025 at 10:51:46PM +0200, David Hildenbrand wrote:
>> On 28.08.25 18:57, Lorenzo Stoakes wrote:
>>> On Thu, Aug 28, 2025 at 12:01:24AM +0200, David Hildenbrand wrote:
>>>> Let's make it clearer that we are operating within a single folio by
>>>> providing both the folio and the page.
>>>>
>>>> This implies that for flush_dcache_folio() we'll now avoid one more
>>>> page->folio lookup, and that we can safely drop the "nth_page" usage.
>>>>
>>>> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
>>>> Signed-off-by: David Hildenbrand <david@...hat.com>
>>>> ---
>>>>    arch/mips/include/asm/cacheflush.h | 11 +++++++----
>>>>    arch/mips/mm/cache.c               |  8 ++++----
>>>>    2 files changed, 11 insertions(+), 8 deletions(-)
>>>>
>>>> diff --git a/arch/mips/include/asm/cacheflush.h b/arch/mips/include/asm/cacheflush.h
>>>> index 5d283ef89d90d..8d79bfc687d21 100644
>>>> --- a/arch/mips/include/asm/cacheflush.h
>>>> +++ b/arch/mips/include/asm/cacheflush.h
>>>> @@ -50,13 +50,14 @@ extern void (*flush_cache_mm)(struct mm_struct *mm);
>>>>    extern void (*flush_cache_range)(struct vm_area_struct *vma,
>>>>    	unsigned long start, unsigned long end);
>>>>    extern void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn);
>>>> -extern void __flush_dcache_pages(struct page *page, unsigned int nr);
>>>> +extern void __flush_dcache_folio_pages(struct folio *folio, struct page *page, unsigned int nr);
>>>
>>> NIT: Be good to drop the extern.
>>
>> I think I'll leave the one in, though, someone should clean up all of them
>> in one go.
> 
> This is how we always clean these up though, buuut to be fair that's in mm.
> 

Well, okay, I'll make all the other functions jealous and blame it on 
you! :P

-- 
Cheers

David / dhildenb