From: Andrew Morton <akpm@linux-foundation.org>
To: Nicholas Piggin <npiggin@gmail.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-arch@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
Zefan Li <lizefan@huawei.com>,
Jonathan Cameron <Jonathan.Cameron@Huawei.com>,
Christoph Hellwig <hch@infradead.org>,
Christophe Leroy <christophe.leroy@csgroup.eu>
Subject: Re: [PATCH v6 01/12] mm/vmalloc: fix vmalloc_to_page for huge vmap mappings
Date: Fri, 21 Aug 2020 13:07:57 -0700 [thread overview]
Message-ID: <20200821130757.289570e4bb491672087d3396@linux-foundation.org> (raw)
In-Reply-To: <20200821151216.1005117-2-npiggin@gmail.com>
On Sat, 22 Aug 2020 01:12:05 +1000 Nicholas Piggin <npiggin@gmail.com> wrote:
> vmalloc_to_page returns NULL for addresses mapped by larger pages[*].
> Whether or not a vmap is huge depends on the architecture details,
> alignments, boot options, etc., which the caller can not be expected
> to know. Therefore HUGE_VMAP is a regression for vmalloc_to_page.
I assume this doesn't matter in current mainline?
If wrong, then what are the user-visible effects and why no cc:stable?
> This change teaches vmalloc_to_page about larger pages, and returns
> the struct page that corresponds to the offset within the large page.
> This makes the API agnostic to mapping implementation details.
next prev parent reply other threads:[~2020-08-21 20:08 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-21 15:12 [PATCH v6 00/12] huge vmalloc mappings Nicholas Piggin
2020-08-21 15:12 ` [PATCH v6 01/12] mm/vmalloc: fix vmalloc_to_page for huge vmap mappings Nicholas Piggin
2020-08-21 20:07 ` Andrew Morton [this message]
2020-08-21 22:42 ` Nicholas Piggin
2020-08-21 15:12 ` [PATCH v6 02/12] mm: apply_to_pte_range warn and fail if a large pte is encountered Nicholas Piggin
2020-08-21 15:12 ` [PATCH v6 03/12] mm/vmalloc: rename vmap_*_range vmap_pages_*_range Nicholas Piggin
2020-08-21 15:12 ` [PATCH v6 04/12] mm/ioremap: rename ioremap_*_range to vmap_*_range Nicholas Piggin
2020-08-21 15:12 ` [PATCH v6 05/12] mm: HUGE_VMAP arch support cleanup Nicholas Piggin
2020-08-21 20:14 ` Andrew Morton
2020-08-21 22:45 ` Nicholas Piggin
2020-08-21 15:12 ` [PATCH v6 06/12] powerpc: inline huge vmap supported functions Nicholas Piggin
2020-08-21 20:15 ` Andrew Morton
2020-08-21 15:12 ` [PATCH v6 07/12] arm64: " Nicholas Piggin
2020-08-21 15:12 ` [PATCH v6 08/12] x86: " Nicholas Piggin
2020-08-21 15:12 ` [PATCH v6 09/12] mm: Move vmap_range from mm/ioremap.c to mm/vmalloc.c Nicholas Piggin
2020-08-21 15:12 ` [PATCH v6 10/12] mm/vmalloc: add vmap_range_noflush variant Nicholas Piggin
2020-08-21 15:12 ` [PATCH v6 11/12] mm/vmalloc: Hugepage vmalloc mappings Nicholas Piggin
2020-08-21 15:38 ` Eric Dumazet
2020-08-21 16:05 ` Nicholas Piggin
2020-08-21 15:12 ` [PATCH v6 12/12] powerpc/64s/radix: Enable huge " Nicholas Piggin
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