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From: "Edgecombe, Rick P" <rick.p.edgecombe@intel.com>
To: "will@kernel.org" <will@kernel.org>, "rppt@kernel.org" <rppt@kernel.org>
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Subject: Re: [PATCH 0/4] arch, mm: improve robustness of direct map manipulation
Date: Thu, 29 Oct 2020 23:19:45 +0000	[thread overview]
Message-ID: <b519c0cec8ad8e67d7a43251e45e49d17d5cfbef.camel@intel.com> (raw)
In-Reply-To: <20201029081225.GK1428094@kernel.org>

On Thu, 2020-10-29 at 10:12 +0200, Mike Rapoport wrote:
> This series goal was primarily to separate dependincies and make it
> clearer what DEBUG_PAGEALLOC and what SET_DIRECT_MAP are. As it
> turned
> out, there is also some lack of consistency between architectures
> that
> implement either of this so I tried to improve this as well.
> 
> Honestly, I don't know if a thread can be paused at the time
> __vunmap()
> left invalid pages, but it could, there is an issue on arm64 with
> DEBUG_PAGEALLOC=n and this set fixes it.

Ah, ok. So from this and the other thread, this is about the logic in
arm's cpa for when it will try the un/map operations. I think the logic
actually works currently. And this series introduces a problem on ARM
similar to the one you are saying preexists. I put the details in the
other thread.


  reply	other threads:[~2020-10-29 23:19 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-25 10:15 [PATCH 0/4] arch, mm: improve robustness of direct map manipulation Mike Rapoport
2020-10-25 10:15 ` [PATCH 1/4] mm: introduce debug_pagealloc_map_pages() helper Mike Rapoport
2020-10-26 11:05   ` David Hildenbrand
2020-10-26 11:54     ` Mike Rapoport
2020-10-26 11:55       ` David Hildenbrand
2020-10-25 10:15 ` [PATCH 2/4] PM: hibernate: improve robustness of mapping pages in the direct map Mike Rapoport
2020-10-26  0:38   ` Edgecombe, Rick P
2020-10-26  9:15     ` Mike Rapoport
2020-10-26 18:57       ` Edgecombe, Rick P
2020-10-27  8:49         ` Mike Rapoport
2020-10-27 22:44           ` Edgecombe, Rick P
2020-10-28  9:41             ` Mike Rapoport
2020-10-27  1:10       ` Edgecombe, Rick P
2020-10-28 21:15   ` Edgecombe, Rick P
2020-10-29  7:54     ` Mike Rapoport
2020-10-29 23:19       ` Edgecombe, Rick P
2020-11-01 17:02         ` Mike Rapoport
2020-10-25 10:15 ` [PATCH 3/4] arch, mm: restore dependency of __kernel_map_pages() of DEBUG_PAGEALLOC Mike Rapoport
2020-10-25 10:15 ` [PATCH 4/4] arch, mm: make kernel_page_present() always available Mike Rapoport
2020-10-26  0:54   ` Edgecombe, Rick P
2020-10-26  9:31     ` Mike Rapoport
2020-10-26  1:13 ` [PATCH 0/4] arch, mm: improve robustness of direct map manipulation Edgecombe, Rick P
2020-10-26  9:05   ` Mike Rapoport
2020-10-26 18:05     ` Edgecombe, Rick P
2020-10-27  8:38       ` Mike Rapoport
2020-10-27  8:46         ` David Hildenbrand
2020-10-27  9:47           ` Mike Rapoport
2020-10-27 10:34             ` David Hildenbrand
2020-10-28 11:09           ` Mike Rapoport
2020-10-28 11:17             ` David Hildenbrand
2020-10-28 12:22               ` Mike Rapoport
2020-10-28 18:31             ` Edgecombe, Rick P
2020-10-28 11:20         ` Will Deacon
2020-10-28 11:30           ` Mike Rapoport
2020-10-28 21:03             ` Edgecombe, Rick P
2020-10-29  8:12               ` Mike Rapoport
2020-10-29 23:19                 ` Edgecombe, Rick P [this message]
2020-10-29  8:15 ` David Hildenbrand

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