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Message-ID: <f427422c-9af3-dc0a-dcc3-2a1114eb77ea@suse.cz>
Date: Fri, 18 Nov 2022 17:45:31 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: David Hildenbrand <david@...hat.com>, linux-kernel@...r.kernel.org
Cc: x86@...nel.org, linux-alpha@...r.kernel.org,
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Arnd Bergmann <arnd@...db.de>,
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Alex Williamson <alex.williamson@...hat.com>
Subject: Re: [PATCH mm-unstable v1 04/20] mm: add early FAULT_FLAG_UNSHARE
consistency checks
On 11/16/22 11:26, David Hildenbrand wrote:
> For now, FAULT_FLAG_UNSHARE only applies to anonymous pages, which
> implies a COW mapping. Let's hide FAULT_FLAG_UNSHARE early if we're not
> dealing with a COW mapping, such that we treat it like a read fault as
> documented and don't have to worry about the flag throughout all fault
> handlers.
>
> While at it, centralize the check for mutual exclusion of
> FAULT_FLAG_UNSHARE and FAULT_FLAG_WRITE and just drop the check that
> either flag is set in the WP handler.
>
> Signed-off-by: David Hildenbrand <david@...hat.com>
> ---
> mm/huge_memory.c | 3 ---
> mm/hugetlb.c | 5 -----
> mm/memory.c | 23 ++++++++++++++++++++---
> 3 files changed, 20 insertions(+), 11 deletions(-)
Reviewed-by: Vlastimil Babka <vbabka@...e.cz>
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