kernel/linux.git/arch/alpha/include/asm/pgtable.h, branch v7.1-rc5

Merge tag 'alpha-for-v7.1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/lindholm/alpha

2026-04-17T15:34:43+00:00

Pull alpha updates from Magnus Lindholm: "One fix to silence pgprot_modify() compiler warnings, and one patch adding SECCOMP/SECCOMP_FILTER support together with the syscall and ptrace fixes needed for it" * tag 'alpha-for-v7.1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/lindholm/alpha: alpha: Define pgprot_modify to silence tautological comparison warnings alpha: add support for SECCOMP and SECCOMP_FILTER

alpha: Define pgprot_modify to silence tautological comparison warnings

2026-04-12T17:14:37+00:00

Alpha's pgprot_noncached, pgprot_writecombine, and pgprot_device are all identity macros, so the generic pgprot_modify() produces tautological self-comparisons that GCC warns about: include/linux/pgtable.h:1701:25: warning: self-comparison always evaluates to true [-Wtautological-compare] Since all caching attributes are no-ops on Alpha, define pgprot_modify() to simply return newprot. Assisted-by: Claude:claude-opus-4-6 Signed-off-by: Matt Turner Reviewed-by: Magnus Lindholm Link: https://lore.kernel.org/r/20260403150128.488513-1-mattst88@gmail.com Signed-off-by: Magnus Lindholm

arch, mm: consolidate empty_zero_page

2026-04-05T20:53:01+00:00

Reduce 22 declarations of empty_zero_page to 3 and 23 declarations of ZERO_PAGE() to 4. Every architecture defines empty_zero_page that way or another, but for the most of them it is always a page aligned page in BSS and most definitions of ZERO_PAGE do virt_to_page(empty_zero_page). Move Linus vetted x86 definition of empty_zero_page and ZERO_PAGE() to the core MM and drop these definitions in architectures that do not implement colored zero page (MIPS and s390). ZERO_PAGE() remains a macro because turning it to a wrapper for a static inline causes severe pain in header dependencies. For the most part the change is mechanical, with these being noteworthy: * alpha: aliased empty_zero_page with ZERO_PGE that was also used for boot parameters. Switching to a generic empty_zero_page removes the aliasing and keeps ZERO_PGE for boot parameters only * arm64: uses __pa_symbol() in ZERO_PAGE() so that definition of ZERO_PAGE() is kept intact. * m68k/parisc/um: allocated empty_zero_page from memblock, although they do not support zero page coloring and having it in BSS will work fine. * sparc64 can have empty_zero_page in BSS rather allocate it, but it can't use virt_to_page() for BSS. Keep it's definition of ZERO_PAGE() but instead of allocating it, make mem_map_zero point to empty_zero_page. * sh: used empty_zero_page for boot parameters at the very early boot. Rename the parameters page to boot_params_page and let sh use the generic empty_zero_page. * hexagon: had an amusing comment about empty_zero_page /* A handy thing to have if one has the RAM. Declared in head.S */ that unfortunately had to go :) Link: https://lkml.kernel.org/r/20260211103141.3215197-4-rppt@kernel.org Signed-off-by: Mike Rapoport (Microsoft) Acked-by: Helge Deller [parisc] Tested-by: Helge Deller [parisc] Reviewed-by: Christophe Leroy (CS GROUP) Acked-by: Dave Hansen Acked-by: Catalin Marinas Acked-by: Magnus Lindholm [alpha] Acked-by: Dinh Nguyen [nios2] Acked-by: Andreas Larsson [sparc] Acked-by: David Hildenbrand (Arm) Acked-by: Liam R. Howlett Cc: "Borislav Petkov (AMD)" Cc: David S. Miller Cc: Geert Uytterhoeven Cc: Guo Ren Cc: Huacai Chen Cc: Ingo Molnar Cc: Johannes Berg Cc: John Paul Adrian Glaubitz Cc: Lorenzo Stoakes Cc: Madhavan Srinivasan Cc: Matt Turner Cc: Max Filippov Cc: Michael Ellerman Cc: Michal Hocko Cc: Michal Simek Cc: Palmer Dabbelt Cc: Richard Weinberger Cc: Russell King Cc: Stafford Horne Cc: Suren Baghdasaryan Cc: Vineet Gupta Cc: Vlastimil Babka Cc: Will Deacon Signed-off-by: Andrew Morton

alpha: add missing address argument in call to page_table_check_pte_clear()

2026-02-13T18:44:31+00:00

After the merge of the alpha and mm trees, this code does not compile, as a parameter is missing in a call to page_table_check_pte_clear(). The parameter was re-added in commit d7b4b67eb6b3 ("mm/page_table_check: reinstate address parameter in [__]page_table_check_pte_clear()"). The alpha-specific code was newly added in commit dd5712f3379c ("alpha: fix user-space corruption during memory compaction"). Fixes: 4cff5c05e076 ("Merge tag 'mm-stable-2026-02-11-19-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm") Signed-off-by: Thomas Weißschuh Acked-by: Magnus Lindholm Signed-off-by: Linus Torvalds

alpha: fix user-space corruption during memory compaction

2026-01-24T09:35:52+00:00

Alpha systems can suffer sporadic user-space crashes and heap corruption when memory compaction is enabled. Symptoms include SIGSEGV, glibc allocator failures (e.g. "unaligned tcache chunk"), and compiler internal errors. The failures disappear when compaction is disabled or when using global TLB invalidation. The root cause is insufficient TLB shootdown during page migration. Alpha relies on ASN-based MM context rollover for instruction cache coherency, but this alone is not sufficient to prevent stale data or instruction translations from surviving migration. Fix this by introducing a migration-specific helper that combines: - MM context invalidation (ASN rollover), - immediate per-CPU TLB invalidation (TBI), - synchronous cross-CPU shootdown when required. The helper is used only by migration/compaction paths to avoid changing global TLB semantics. Additionally, update flush_tlb_other(), pte_clear(), to use READ_ONCE()/WRITE_ONCE() for correct SMP memory ordering. This fixes observed crashes on both UP and SMP Alpha systems. Reviewed-by: Ivan Kokshaysky Tested-by: Matoro Mahri Tested-by: Michael Cree Signed-off-by: Magnus Lindholm Link: https://lore.kernel.org/r/20260102173603.18247-2-linmag7@gmail.com Signed-off-by: Magnus Lindholm

alpha: unobfuscate _PAGE_P() definition

2025-09-16T01:12:05+00:00

Way, way back it used to be _PAGE_NORMAL((x) | ((x & _PAGE_FOW) ? 0 : _PAGE_FOW | _PAGE_COW)) Then (in 1.3.54) _PAGE_COW had died. Result: _PAGE_NORMAL((x) | ((x & _PAGE_FOW) ? 0 : _PAGE_FOW)) which is somewhat... obscure. What it does is simply _PAGE_NORMAL((x) | _PAGE_FOW) and IMO that's easier to follow. Signed-off-by: Al Viro

alpha: get rid of the remnants of BAD_PAGE and friends

2025-09-13T19:15:08+00:00

unused since 2.4 times... Signed-off-by: Al Viro

PAGE_PTR() had been last used outside of arch/* in 1.1.94

2025-09-13T19:15:07+00:00

.. and in arch/* - circa 2.2.7. Reviewed-by: Geert Uytterhoeven # m68k Acked-by: Geert Uytterhoeven # m68k Signed-off-by: Al Viro

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

mm: introduce a common definition of mk_pte()

2025-05-12T00:48:02+00:00

Most architectures simply call pfn_pte(). Centralise that as the normal definition and remove the definition of mk_pte() from the architectures which have either that exact definition or something similar. Link: https://lkml.kernel.org/r/20250402181709.2386022-3-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Acked-by: Geert Uytterhoeven # m68k Acked-by: David Hildenbrand Reviewed-by: Alexander Gordeev # s390 Cc: Zi Yan Cc: Andreas Larsson Cc: Anton Ivanov Cc: Dave Hansen Cc: "David S. Miller" Cc: Johannes Berg Cc: Muchun Song Cc: Richard Weinberger Cc: Signed-off-by: Andrew Morton