en Copyright 2015 Java http://kernelsources.org:8080/source/history/linux/arch/alpha/include/asm/hugetlb.h#742f62b63904cdc20a364a49d2861e32464a0af7 Merge tag 'alpha-for-v7.4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/lindholm/alphaPull alpha updates from Magnus Lindholm: "This completes Alpha's conversion to GENERIC_ENTRY and enables a range of kernel features through Kconfig updates, including UBSAN, gcov, kmemleak, page-table checking, fast GUP and sparse IRQs. It includes TLB and MMU context fixes prompted by glibc test-suite failures, HugeTLB support for 64KB, 512KB and 4MB pages, and fixes for poisoned-page faults and page-table checking. Machine-check handling is improved on Tsunami platforms, with bounded EV6 logout decoding, Clipper environmental event reporting and safer firmware console-log scanning. Other changes add self-extracting compressed kernels with support for all kernel compression formats, Alpha-specific XZ tuning, perf register and user-stack sampling, and Alpha support in the seccomp selftests. The series also fixes user stack-pointer reporting and IRQ entry ordering, adds 128-bit shift helpers, cleans up linker sections, and updates Kconfig help"* tag 'alpha-for-v7.4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/lindholm/alpha: (57 commits) alpha: add bounded Clipper console-log scanning alpha: decode Clipper environmental events alpha: decode and acknowledge Tsunami system machine checks alpha: bound EV6 logout decoding by the processor area alpha: describe the Tsunami system machine check frame alpha: move Tsunami machine check handling to err_tsunami.c alpha: fill in pc for software event samples alpha: add HAVE_PERF_REGS and HAVE_PERF_USER_STACK_DUMP support alpha: use user_stack_pointer() in KSTK_ESP() and dump_elf_thread() alpha: stop storing the user stack pointer in pt_regs alpha: fix stale user_stack_pointer() selftests/seccomp: add Alpha support to seccomp_bpf alpha: do not skip TLB shootdown IPIs for kthread-borrowed mms alpha: do not clear remote MMU contexts in migrate_flush_tlb_page() alpha: invalidate the local context in flush_icache_user_page() alpha: invalidate the local context in flush_tlb_mm() alpha: fix the local TLB invalidate in the UP flush_tlb_page() alpha: fix the local TLB invalidate in flush_tlb_page() alpha: invalidate the local context in flush_tlb_page() alpha: only use a targeted tbi() when the target mm is really current ... List of files: /linux/arch/alpha/include/asm/hugetlb.h Wed, 21 Oct 2026 02:31:24 +0200 Linus Torvalds <torvalds@linux-foundation.org> http://kernelsources.org:8080/source/history/linux/arch/alpha/include/asm/hugetlb.h#8ba8994e76e45a47e749a7f92fdfe0ee701362e3 alpha: implement hugetlb supportAlpha has no leaf entry above the last page table level, so the onlyhuge pages it can offer are granularity hint blocks: 64KB, 512KB and 4MBwith 8KB pages. Register all three as hstates, with 4MB as the default.There is no PMD sized huge page, hence no transparent huge pages, no PMDpage table sharing and no gigantic pages.As with arm64's contiguous PTEs, each PTE of a block keeps the framenumber of its own page, so a block is written with set_ptes(). Eachhstate's buddy order is its hint order, so a hugetlb folio is alwaysnaturally aligned physically, as the hint requires, including after ademote.All PTEs of a block must agree in bits <15:0> (note 2 of Table 22-3 ofthe Alpha Architecture Reference Manual), and both __ACCESS_BITS and__DIRTY_BITS reach into that range, so every update rewrites the wholeblock and huge_ptep_get() merges the young and dirty state backtogether. Rewriting a valid block in place would leave its PTEsdisagreeing part way through, so changes to a valid block go throughbreak before make, following the procedure in section 11.6.1.The hint is advisory, so this is safe on implementations that ignore it,and gup_fast needs no changes since it walks the individual PTEs.Enabling CONFIG_HUGETLB_PAGE derives pageblock_order fromHUGETLB_PAGE_ORDER, which lowers it from 10 to 9 and so halves theanti-fragmentation and compaction granularity from 8MB to 4MB.Hugepage migration is left disabled, since it has not been tested.Co-developed-by: Magnus Lindholm <linmag7@gmail.com>Signed-off-by: Magnus Lindholm <linmag7@gmail.com>Signed-off-by: Matt Turner <mattst88@gmail.com>Tested-by: Magnus Lindholm <linmag7@gmail.com>Reviewed-by: Magnus Lindholm <linmag7@gmail.com>Link: https://lore.kernel.org/r/20261007-alpha-hugepages-v2-6-8e108af2d961@gmail.comSigned-off-by: Magnus Lindholm <linmag7@gmail.com> List of files: /linux/arch/alpha/include/asm/hugetlb.h Thu, 08 Oct 2026 05:24:09 +0200 Matt Turner <mattst88@gmail.com>