kernel/arch/um/include/asm/page.h, branch linux-rolling-stable

x86/um: Drop gate area handling

2025-11-06T12:02:33Z

With the removal of the vDSO passthrough from the host, FIXADDR_USER_START is always 0 and the gate area setup code is dead. Remove it. Signed-off-by: Thomas Weißschuh Link: https://patch.msgid.link/20251028-uml-remove-32bit-pseudo-vdso-v1-5-e930063eff5f@weissschuh.net Signed-off-by: Johannes Berg

um: Replace ASSEMBLY with ASSEMBLER in the usermode headers

2025-07-22T15:12:45Z

While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembly code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This can be very confusing when switching between userspace and kernelspace coding, so let's standardize on the __ASSEMBLER__ macro that is provided by the compilers now. This is a completely mechanical patch (done with a simple "sed -i" statement). Cc: Richard Weinberger Cc: Anton Ivanov Cc: Johannes Berg Cc: linux-um@lists.infradead.org Signed-off-by: Thomas Huth Link: https://patch.msgid.link/20250314071013.1575167-36-thuth@redhat.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

2024-11-30T18:34:54Z

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 ...

um: Rename _PAGE_NEWPAGE to _PAGE_NEEDSYNC

2024-10-23T07:52:49Z

The _PAGE_NEWPAGE bit does not really indicate that this is a new page, but rather whether this entry needs to be synced or not. Renaming it to _PAGE_NEEDSYNC will make it more clear how everything ties together. Suggested-by: Benjamin Berg Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20241011102354.1682626-3-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg

vdso: Introduce vdso/page.h

2024-10-15T22:13:04Z

The VDSO implementation includes headers from outside of the vdso/ namespace. Introduce vdso/page.h to make sure that the generic library uses only the allowed namespace. Signed-off-by: Vincenzo Frascino Signed-off-by: Thomas Gleixner Reviewed-by: Arnd Bergmann Acked-by: Geert Uytterhoeven # m68k Link: https://lore.kernel.org/all/20241014151340.1639555-3-vincenzo.frascino@arm.com

um: Switch to 4 level page tables on 64 bit

2024-10-10T11:37:22Z

The larger memory space is useful to support more applications inside UML. One example for this is ASAN instrumentation of userspace applications which requires addresses that would otherwise not be available. Signed-off-by: Benjamin Berg Link: https://patch.msgid.link/20240919124511.282088-11-benjamin@sipsolutions.net Signed-off-by: Johannes Berg

um: Remove 3-level page table support on i386

2024-10-10T10:06:43Z

The highmem support has been removed by commit a98a6d864d3b ("um: Remove broken highmem support"). The 2-level page table is sufficient on UML/i386 now. Remove the 3-level page table support on UML/i386 which is still marked as experimental. Suggested-by: Benjamin Berg Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20240918061702.614837-1-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg

arch: define CONFIG_PAGE_SIZE_*KB on all architectures

2024-03-06T18:29:09Z

Most architectures only support a single hardcoded page size. In order to ensure that each one of these sets the corresponding Kconfig symbols, change over the PAGE_SHIFT definition to the common one and allow only the hardware page size to be selected. Acked-by: Guo Ren Acked-by: Heiko Carstens Acked-by: Stafford Horne Acked-by: Johannes Berg Acked-by: Geert Uytterhoeven Reviewed-by: Thomas Gleixner Signed-off-by: Arnd Bergmann

mm, arch: add generic implementation of pfn_valid() for FLATMEM

2023-02-10T00:51:41Z

Every architecture that supports FLATMEM memory model defines its own version of pfn_valid() that essentially compares a pfn to max_mapnr. Use mips/powerpc version implemented as static inline as a generic implementation of pfn_valid() and drop its per-architecture definitions. [rppt@kernel.org: fix the generic pfn_valid()] Link: https://lkml.kernel.org/r/Y9lg7R1Yd931C+y5@kernel.org Link: https://lkml.kernel.org/r/20230129124235.209895-5-rppt@kernel.org Signed-off-by: Mike Rapoport (IBM) Acked-by: Arnd Bergmann Acked-by: Guo Ren [csky] Acked-by: Huacai Chen [LoongArch] Acked-by: Stafford Horne [OpenRISC] Acked-by: Michael Ellerman [powerpc] Reviewed-by: David Hildenbrand Tested-by: Conor Dooley Cc: Brian Cain Cc: "David S. Miller" Cc: Dinh Nguyen Cc: Geert Uytterhoeven Cc: Greg Ungerer Cc: Helge Deller Cc: Huacai Chen Cc: Matt Turner Cc: Max Filippov Cc: Michal Simek Cc: Palmer Dabbelt Cc: Richard Weinberger Cc: Rich Felker Cc: Russell King Cc: Thomas Bogendoerfer Cc: Vineet Gupta Cc: WANG Xuerui Cc: Yoshinori Sato Signed-off-by: Andrew Morton

um: Replace to_phys() and to_virt() with less generic function names

2022-07-14T18:57:27Z

The UML function names to_virt() and to_phys() are exposed by UML headers, and are very generic and may be defined by drivers. As it turns out, commit 9409c9b6709e ("pmem: refactor pmem_clear_poison()") did exactly that. This results in build errors such as the following when trying to build um:allmodconfig: drivers/nvdimm/pmem.c: In function ‘pmem_dax_zero_page_range’: ./arch/um/include/asm/page.h:105:20: error: too few arguments to function ‘to_phys’ 105 | #define __pa(virt) to_phys((void *) (unsigned long) (virt)) | ^~~~~~~ Use less generic function names for the um specific to_phys() and to_virt() functions to fix the problem and to avoid similar problems in the future. Fixes: 9409c9b6709e ("pmem: refactor pmem_clear_poison()") Cc: Dan Williams Cc: Christoph Hellwig Signed-off-by: Guenter Roeck Signed-off-by: Linus Torvalds