kernel/linux.git/arch/alpha/include/asm/pgtable.h, branch v7.0-rc7

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

alpha/elf: Fix misc/setarch test of util-linux by removing 32bit support

2025-02-06T15:35:38+00:00

Richard Henderson writes[1]: > There was a Spec benchmark (I forget which) which was memory bound and ran > twice as fast with 32-bit pointers. > > I copied the idea from DEC to the ELF abi, but never did all the other work > to allow the toolchain to take advantage. > > Amusingly, a later Spec changed the benchmark data sets to not fit into a > 32-bit address space, specifically because of this. > > I expect one could delete the ELF bit and personality and no one would > notice. Not even the 10 remaining Alpha users. In [2] it was pointed out that parts of setarch weren't working properly on alpha because it has it's own SET_PERSONALITY implementation. In the discussion that followed Richard Henderson pointed out that the 32bit pointer support for alpha was never completed. Fix this by removing alpha's 32bit pointer support. As a bit of paranoia refuse to execute any alpha binaries that have the EF_ALPHA_32BIT flag set. Just in case someone somewhere has binaries that try to use alpha's 32bit pointer support. Link: https://lkml.kernel.org/r/CAFXwXrkgu=4Qn-v1PjnOR4SG0oUb9LSa0g6QXpBq4ttm52pJOQ@mail.gmail.com [1] Link: https://lkml.kernel.org/r/20250103140148.370368-1-glaubitz@physik.fu-berlin.de [2] Signed-off-by: Eric W. Biederman Reviewed-by: Richard Henderson Reviewed-by: Arnd Bergmann Reviewed-by: John Paul Adrian Glaubitz Tested-by: John Paul Adrian Glaubitz Link: https://lore.kernel.org/r/87y0zfs26i.fsf_-_@email.froward.int.ebiederm.org Signed-off-by: Kees Cook

Merge tag 'x86_shstk_for_6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2023-08-31T19:20:12+00:00

Pull x86 shadow stack support from Dave Hansen: "This is the long awaited x86 shadow stack support, part of Intel's Control-flow Enforcement Technology (CET). CET consists of two related security features: shadow stacks and indirect branch tracking. This series implements just the shadow stack part of this feature, and just for userspace. The main use case for shadow stack is providing protection against return oriented programming attacks. It works by maintaining a secondary (shadow) stack using a special memory type that has protections against modification. When executing a CALL instruction, the processor pushes the return address to both the normal stack and to the special permission shadow stack. Upon RET, the processor pops the shadow stack copy and compares it to the normal stack copy. For more information, refer to the links below for the earlier versions of this patch set" Link: https://lore.kernel.org/lkml/20220130211838.8382-1-rick.p.edgecombe@intel.com/ Link: https://lore.kernel.org/lkml/20230613001108.3040476-1-rick.p.edgecombe@intel.com/ * tag 'x86_shstk_for_6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (47 commits) x86/shstk: Change order of __user in type x86/ibt: Convert IBT selftest to asm x86/shstk: Don't retry vm_munmap() on -EINTR x86/kbuild: Fix Documentation/ reference x86/shstk: Move arch detail comment out of core mm x86/shstk: Add ARCH_SHSTK_STATUS x86/shstk: Add ARCH_SHSTK_UNLOCK x86: Add PTRACE interface for shadow stack selftests/x86: Add shadow stack test x86/cpufeatures: Enable CET CR4 bit for shadow stack x86/shstk: Wire in shadow stack interface x86: Expose thread features in /proc/$PID/status x86/shstk: Support WRSS for userspace x86/shstk: Introduce map_shadow_stack syscall x86/shstk: Check that signal frame is shadow stack mem x86/shstk: Check that SSP is aligned on sigreturn x86/shstk: Handle signals for shadow stack x86/shstk: Introduce routines modifying shstk x86/shstk: Handle thread shadow stack x86/shstk: Add user-mode shadow stack support ...

alpha: implement the new page table range API

2023-08-24T23:20:19+00:00

Add PFN_PTE_SHIFT, update_mmu_cache_range() and flush_icache_pages(). Link: https://lkml.kernel.org/r/20230802151406.3735276-8-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Acked-by: Mike Rapoport (IBM) Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Matt Turner Signed-off-by: Andrew Morton