wireguard-linux/fs/proc/page.c, branch update-toolchain

kpageflags: detect isolated KPF_THP folios

2024-07-12T22:52:21Z

When folio is isolated, the PG_lru bit is cleared. So the PG_lru check in stable_page_flags() will miss this kind of isolated folios. Use folio_test_large_rmappable() instead to also include isolated folios. Since pagecache supports large folios and the introduction of mTHP, the semantics of KPF_THP have been expanded, now it indicates not only PMD-sized THP. Update related documentation to clearly state that KPF_THP indicates multiple order THPs. [ran.xiaokai@zte.com.cn: directly use is_zero_folio(), per David] Link: https://lkml.kernel.org/r/20240708062601.165215-1-ranxiaokai627@163.com Link: https://lkml.kernel.org/r/20240705104343.112680-1-ranxiaokai627@163.com Signed-off-by: Ran Xiaokai Acked-by: David Hildenbrand Cc: Andrei Vagin Cc: Jonathan Corbet Cc: Muhammad Usama Anjum Cc: Ryan Roberts Cc: Svetly Todorov Cc: Vlastimil Babka Cc: Zi Yan Signed-off-by: Andrew Morton

fs/proc: move page_mapcount() to fs/proc/internal.h

2024-07-04T02:30:06Z

... and rename it to folio_precise_page_mapcount(). fs/proc is the last remaining user, and that should stay that way. While at it, cleanup kpagecount_read() a bit: there are still some legacy leftovers -- when the interface was introduced it returned the page refcount, but was changed briefly afterwards to return the page mapcount. Further, some simple folio conversion. Once we stop using the per-page mapcounts of large folios, all folio_precise_page_mapcount() users will have to implement an alternative way to achieve what they are trying to achieve, possibly in a less precise way. [dan.carpenter@linaro.org: fix uninitialized variable in pagemap_pmd_range()] Link: https://lkml.kernel.org/r/9d6eaba7-92f8-4a70-8765-38a519680a87@moroto.mountain Link: https://lkml.kernel.org/r/20240607122357.115423-6-david@redhat.com Signed-off-by: David Hildenbrand Signed-off-by: Dan Carpenter Cc: Alexey Dobriyan Cc: Jonathan Corbet Cc: Kirill A. Shutemov Cc: Lance Yang Cc: Oscar Salvador Signed-off-by: Andrew Morton

mm: add is_huge_zero_folio()

2024-04-26T03:56:18Z

This is the folio equivalent of is_huge_zero_page(). It doesn't add any efficiency, but it does prevent the caller from passing a tail page and getting confused when the predicate returns false. Link: https://lkml.kernel.org/r/20240326202833.523759-3-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: David Hildenbrand Signed-off-by: Andrew Morton

proc: rewrite stable_page_flags()

2024-04-26T03:56:15Z

Reduce the usage of PageFlag tests and reduce the number of compound_head() calls. For multi-page folios, we'll now show all pages as having the flags that apply to them, e.g. if it's dirty, all pages will have the dirty flag set instead of just the head page. The mapped flag is still per page, as is the hwpoison flag. [willy@infradead.org: fix up some bits vs masks] Link: https://lkml.kernel.org/r/20240403173112.1450721-1-willy@infradead.org [willy@infradead.org: fix warnings] Link: https://lkml.kernel.org/r/ZhBPtCYfSuFuUMEz@casper.infradead.org Link: https://lkml.kernel.org/r/20240326171045.410737-11-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Svetly Todorov Signed-off-by: Andrew Morton

mm: support page_mapcount() on page_has_type() pages

2024-04-25T02:34:26Z

Return 0 for pages which can't be mapped. This matches how page_mapped() works. It is more convenient for users to not have to filter out these pages. Link: https://lkml.kernel.org/r/20240321142448.1645400-5-willy@infradead.org Fixes: 9c5ccf2db04b ("mm: remove HUGETLB_PAGE_DTOR") Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: David Hildenbrand Acked-by: Vlastimil Babka Cc: Miaohe Lin Cc: Muchun Song Cc: Oscar Salvador Cc: Signed-off-by: Andrew Morton

mm, pagemap: remove SLOB and SLQB from comments and documentation

2023-03-29T08:32:11Z

SLOB has been removed and SLQB never merged, so remove their mentions from comments and documentation of pagemap. In stable_page_flags() also correct an outdated comment mentioning that PageBuddy() means a page->_refcount of -1, and remove compound_head() from the PageSlab() call, as that's already implicitly there thanks to PF_NO_TAIL. Signed-off-by: Vlastimil Babka Acked-by: Lorenzo Stoakes Acked-by: Mike Rapoport (IBM)

mm: Add PG_arch_3 page flag

2022-11-29T09:26:07Z

As with PG_arch_2, this flag is only allowed on 64-bit architectures due to the shortage of bits available. It will be used by the arm64 MTE code in subsequent patches. Signed-off-by: Peter Collingbourne Cc: Will Deacon Cc: Marc Zyngier Cc: Steven Price [catalin.marinas@arm.com: added flag preserving in __split_huge_page_tail()] Signed-off-by: Catalin Marinas Reviewed-by: Steven Price Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20221104011041.290951-5-pcc@google.com

mm: Do not enable PG_arch_2 for all 64-bit architectures

2022-11-29T09:26:06Z

Commit 4beba9486abd ("mm: Add PG_arch_2 page flag") introduced a new page flag for all 64-bit architectures. However, even if an architecture is 64-bit, it may still have limited spare bits in the 'flags' member of 'struct page'. This may happen if an architecture enables SPARSEMEM without SPARSEMEM_VMEMMAP as is the case with the newly added loongarch. This architecture port needs 19 more bits for the sparsemem section information and, while it is currently fine with PG_arch_2, adding any more PG_arch_* flags will trigger build-time warnings. Add a new CONFIG_ARCH_USES_PG_ARCH_X option which can be selected by architectures that need more PG_arch_* flags beyond PG_arch_1. Select it on arm64. Signed-off-by: Catalin Marinas [pcc@google.com: fix build with CONFIG_ARM64_MTE disabled] Signed-off-by: Peter Collingbourne Reported-by: kernel test robot Cc: Andrew Morton Cc: Steven Price Reviewed-by: Steven Price Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20221104011041.290951-2-pcc@google.com

proc: mark more files as permanent

2022-10-03T21:21:45Z

Mark /proc/devices /proc/kpagecount /proc/kpageflags /proc/kpagecgroup /proc/loadavg /proc/meminfo /proc/softirqs /proc/uptime /proc/version as permanent /proc entries, saving alloc/free and some list/spinlock ops per use. These files are never removed by the kernel so it is OK to mark them. Link: https://lkml.kernel.org/r/Yyn527DzDMa+r0Yj@localhost.localdomain Signed-off-by: Alexey Dobriyan Signed-off-by: Andrew Morton

mm: don't include in

2022-03-03T17:47:33Z

Move the check for the actual pgmap types that need the free at refcount one behavior into the out of line helper, and thus avoid the need to pull memremap.h into mm.h. Link: https://lkml.kernel.org/r/20220210072828.2930359-7-hch@lst.de Signed-off-by: Christoph Hellwig Reviewed-by: Logan Gunthorpe Reviewed-by: Jason Gunthorpe Reviewed-by: Dan Williams Acked-by: Felix Kuehling Tested-by: "Sierra Guiza, Alejandro (Alex)" Cc: Alex Deucher Cc: Alistair Popple Cc: Ben Skeggs Cc: Chaitanya Kulkarni Cc: Karol Herbst Cc: Lyude Paul Cc: Miaohe Lin Cc: Muchun Song Cc: "Pan, Xinhui" Cc: Ralph Campbell Signed-off-by: Andrew Morton Signed-off-by: Matthew Wilcox (Oracle)