From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@suse.de>, Vlastimil Babka <vbabka@suse.cz>,
David Hildenbrand <david@redhat.com>,
linux-mm@kvack.org, linux-arch@vger.kernel.org,
linux-kernel@vger.kernel.org,
Jani Nikula <jani.nikula@linux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@intel.com>
Subject: Re: [PATCH 04/10] drm/i915: Fix MAX_ORDER usage in i915_gem_object_get_pages_internal()
Date: Wed, 15 Mar 2023 18:28:02 +0300 [thread overview]
Message-ID: <20230315152802.gr2olzji5zhu6vdo@box> (raw)
In-Reply-To: <7fe9a4a0-9b30-38db-e739-1dc1f7a8f74e@linux.intel.com>
On Wed, Mar 15, 2023 at 02:18:52PM +0000, Tvrtko Ursulin wrote:
>
> On 15/03/2023 11:31, Kirill A. Shutemov wrote:
> > MAX_ORDER is not inclusive: the maximum allocation order buddy allocator
> > can deliver is MAX_ORDER-1.
>
> This looks to be true on inspection:
>
> __alloc_pages():
> ..
> if (WARN_ON_ONCE_GFP(order >= MAX_ORDER, gfp))
>
> So a bit of a misleading name "max".. For the i915 patch:
>
> Acked-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
>
> I don't however see the whole series to understand the context, or how you
> want to handle the individual patches. Is it a tree wide cleanup of the same
> mistake?
The whole patchset can be seen here:
https://lore.kernel.org/all/20230315113133.11326-1-kirill.shutemov@linux.intel.com/
The idea is to fix all MAX_ORDER bugs first and then re-define MAX_ORDER
more sensibly.
--
Kiryl Shutsemau / Kirill A. Shutemov
next prev parent reply other threads:[~2023-03-15 15:28 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-15 11:31 [PATCH 00/10] Fix confusion around MAX_ORDER Kirill A. Shutemov
2023-03-15 11:31 ` [PATCH 01/10] sparc/mm: Fix MAX_ORDER usage in tsb_grow() Kirill A. Shutemov
2023-03-16 3:04 ` Mike Kravetz
2023-03-17 8:46 ` Mike Rapoport
2023-03-17 8:35 ` Mike Rapoport
2023-03-21 7:48 ` Vlastimil Babka
2023-03-15 11:31 ` [PATCH 02/10] um: Fix MAX_ORDER usage in linux_main() Kirill A. Shutemov
2023-03-17 8:49 ` Mike Rapoport
2023-03-21 7:49 ` Vlastimil Babka
2023-03-15 11:31 ` [PATCH 03/10] floppy: Fix MAX_ORDER usage Kirill A. Shutemov
2023-03-17 8:53 ` Mike Rapoport
2023-03-21 7:53 ` Vlastimil Babka
2023-03-15 11:31 ` [PATCH 04/10] drm/i915: Fix MAX_ORDER usage in i915_gem_object_get_pages_internal() Kirill A. Shutemov
2023-03-15 14:18 ` Tvrtko Ursulin
2023-03-15 15:28 ` Kirill A. Shutemov [this message]
2023-03-15 15:35 ` Tvrtko Ursulin
2023-03-15 15:38 ` Kirill A. Shutemov
2023-03-16 8:55 ` Tvrtko Ursulin
2023-03-21 7:57 ` Vlastimil Babka
2023-03-21 7:55 ` Vlastimil Babka
2023-03-15 11:31 ` [PATCH 05/10] genwqe: Fix MAX_ORDER usage Kirill A. Shutemov
2023-03-21 7:59 ` Vlastimil Babka
2023-03-15 11:31 ` [PATCH 06/10] perf/core: Fix MAX_ORDER usage in rb_alloc_aux_page() Kirill A. Shutemov
2023-03-21 8:00 ` Vlastimil Babka
2023-03-15 11:31 ` [PATCH 07/10] mm/page_reporting: Fix MAX_ORDER usage in page_reporting_register() Kirill A. Shutemov
2023-03-21 8:01 ` Vlastimil Babka
2023-03-15 11:31 ` [PATCH 08/10] mm/slub: Fix MAX_ORDER usage in calculate_order() Kirill A. Shutemov
2023-03-16 11:18 ` Vlastimil Babka
2023-03-15 11:31 ` [PATCH 09/10] iommu: Fix MAX_ORDER usage in __iommu_dma_alloc_pages() Kirill A. Shutemov
2023-03-15 12:18 ` Robin Murphy
2023-03-22 12:20 ` Joerg Roedel
2023-03-15 16:07 ` Jacob Pan
2023-03-21 8:05 ` Vlastimil Babka
2023-03-15 11:31 ` [PATCH 10/10] mm, treewide: Redefine MAX_ORDER sanely Kirill A. Shutemov
2023-03-15 15:06 ` kernel test robot
2023-03-15 15:26 ` Kirill A. Shutemov
2023-03-15 15:26 ` kernel test robot
2023-03-15 15:38 ` Kirill A. Shutemov
2023-03-16 17:09 ` Zi Yan
2023-03-16 23:21 ` Kirill A. Shutemov
2023-03-17 13:17 ` Zi Yan
2023-03-16 18:15 ` Mike Kravetz
2023-03-16 23:00 ` Mike Kravetz
2023-03-16 23:30 ` Kirill A. Shutemov
2023-03-17 1:57 ` Vineet Gupta
2023-03-21 11:22 ` Vlastimil Babka
2023-03-22 3:26 ` Michael Ellerman
2023-03-21 16:38 ` [PATCH 00/10] Fix confusion around MAX_ORDER Mel Gorman
2023-03-23 15:03 ` David Laight
2023-09-27 17:11 ` Paolo Bonzini
2023-09-28 7:50 ` Mikulas Patocka
2023-09-28 16:57 ` Paolo Bonzini
2023-10-17 10:46 ` Pavel Machek
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