kernel/linux.git/arch/um/include/asm/pgtable.h, branch v6.19.12

um: Avoid circular dependency on asm-offsets in pgtable.h

2025-10-28T10:40:49+00:00

Recent changes have added an include of as-layout.h to pgtable.h. However this introduces a circular dependency during asm-offsets generation as as-layout.h depends on asm-offsets and pgtable.h is an input for asm-offsets. Building from a clean state results in the following error: CC arch/um/kernel/asm-offsets.s In file included from arch/um/include/asm/pgtable.h:48, from include/linux/pgtable.h:6, from include/linux/mm.h:31, from include/linux/pid_namespace.h:7, from include/linux/ptrace.h:10, from include/linux/audit.h:13, from arch/um/kernel/asm-offsets.c:8: arch/um/include/shared/as-layout.h:9:10: fatal error: generated/asm-offsets.h: No such file or directory 9 | #include | ^~~~~~~~~~~~~~~~~~~~~~~~~ compilation terminated. make[4]: *** [scripts/Makefile.build:182: arch/um/kernel/asm-offsets.s] Error 1 As the inclusion of as-layout.h in pgtable.h is not yet needed while asm-offsets are generated, break the dependency here. Fixes: a7f7dbae94a5 ("um: Remove file-based iomem emulation support") Signed-off-by: Thomas Weißschuh Reviewed-by: Tiwei Bie Link: https://patch.msgid.link/20251028-uml-offsets-circular-v1-1-601c363cfaaa@weissschuh.net Signed-off-by: Johannes Berg

um: Add initial SMP support

2025-10-27T15:41:15+00:00

Add initial symmetric multi-processing (SMP) support to UML. With this support enabled, users can tell UML to start multiple virtual processors, each represented as a separate host thread. In UML, kthreads and normal threads (when running in kernel mode) can be scheduled and executed simultaneously on different virtual processors. However, the userspace code of normal threads still runs within their respective single-threaded stubs. That is, SMP support is currently available both within the kernel and across different processes, but still remains limited within threads of the same process in userspace. Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20251027001815.1666872-6-tiwei.bie@linux.dev Signed-off-by: Johannes Berg

um: Remove file-based iomem emulation support

2025-10-27T15:37:12+00:00

The file-based iomem emulation was introduced to support writing paravirtualized drivers based on emulated iomem regions. However, the only driver that makes use of it is an example driver called mmapper, which was written over two decades ago. We now have several modern device emulation mechanisms, such as vhost-user-based virtio-uml. Remove the file-based iomem emulation support to reduce the maintenance burden. Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20251027054519.1996090-5-tiwei.bie@linux.dev Signed-off-by: Johannes Berg

mm: pgtable: fix pte_swp_exclusive

2025-06-11T21:52:08+00:00

Make pte_swp_exclusive return bool instead of int. This will better reflect how pte_swp_exclusive is actually used in the code. This fixes swap/swapoff problems on Alpha due pte_swp_exclusive not returning correct values when _PAGE_SWP_EXCLUSIVE bit resides in upper 32-bits of PTE (like on alpha). Suggested-by: Al Viro Signed-off-by: Magnus Lindholm Cc: Sam James Link: https://lore.kernel.org/lkml/20250218175735.19882-2-linmag7@gmail.com/ Link: https://lore.kernel.org/lkml/20250602041118.GA2675383@ZenIV/ [ Applied as the 'sed' script Al suggested - Linus ] Signed-off-by: Linus Torvalds

um: remove custom definition of mk_pte()

2025-05-12T00:48:03+00:00

Move the pfn_pte() definitions from the 2level and 4level files to the generic pgtable.h and delete the custom definition of mk_pte() so that we use the central definition. Link: https://lkml.kernel.org/r/20250402181709.2386022-6-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Cc: Zi Yan Cc: Richard Weinberger Cc: Anton Ivanov Cc: Johannes Berg Cc: Alexander Gordeev Cc: Andreas Larsson Cc: Dave Hansen Cc: David Hildenbrand Cc: "David S. Miller" Cc: Geert Uytterhoeven Cc: Muchun Song Cc: Signed-off-by: Andrew Morton

um: Include missing headers in asm/pgtable.h

2025-01-13T16:19:43+00:00

Formerly, asm/pgtable.h relied on the implicit inclusion of asm/page.h and linux/mm_types.h via asm/fixmap.h. With the removal of asm/fixmap.h, these headers need to be included explicitly in asm/pgtable.h now. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202501131814.E6CxjulL-lkp@intel.com/ Fixes: 5bfc4a3a0af3 ("um: Remove obsolete fixmap support") Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20250113153218.3331321-2-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg

um: Remove obsolete fixmap support

2025-01-10T12:49:33+00:00

It was added to support highmem. But since the highmem support has been removed by commit a98a6d864d3b ("um: Remove broken highmem support"), it is no longer needed. Remove it to simplify the code. Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20241128081939.2216246-3-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg

um: Remove unused MODULES_LEN macro

2025-01-10T12:49:33+00:00

It's not used anywhere. And its definition doesn't seem right. Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20241128081939.2216246-2-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg

Merge tag 'uml-for-linus-6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux

2024-11-30T18:34:54+00:00

Pull UML updates from Richard Weinberger: - Lots of cleanups, mostly from Benjamin Berg and Tiwei Bie - Removal of unused code - Fix for sparse warnings - Cleanup around stub_exe() * tag 'uml-for-linus-6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux: (68 commits) hostfs: Fix the NULL vs IS_ERR() bug for __filemap_get_folio() um: move thread info into task um: Always dump trace for specified task in show_stack um: vector: Do not use drvdata in release um: net: Do not use drvdata in release um: ubd: Do not use drvdata in release um: ubd: Initialize ubd's disk pointer in ubd_add um: virtio_uml: query the number of vqs if supported um: virtio_uml: fix call_fd IRQ allocation um: virtio_uml: send SET_MEM_TABLE message with the exact size um: remove broken double fault detection um: remove duplicate UM_NSEC_PER_SEC definition um: remove file sync for stub data um: always include kconfig.h and compiler-version.h um: set DONTDUMP and DONTFORK flags on KASAN shadow memory um: fix sparse warnings in signal code um: fix sparse warnings from regset refactor um: Remove double zero check um: fix stub exe build with CONFIG_GCOV um: Use os_set_pdeathsig helper in winch thread/process ...

asm-generic: provide generic page_to_phys and phys_to_page implementations

2024-10-28T21:44:28+00:00

page_to_phys is duplicated by all architectures, and from some strange reason placed in where it doesn't fit at all. phys_to_page is only provided by a few architectures despite having a lot of open coded users. Provide generic versions in to make these helpers more easily usable. Note with this patch powerpc loses the CONFIG_DEBUG_VIRTUAL pfn_valid check. It will be added back in a generic version later. Signed-off-by: Christoph Hellwig Signed-off-by: Arnd Bergmann