The patch titled Subject: MIPS: don't select ARCH_HAS_PTE_SPECIAL has been added to the -mm tree. Its filename is mips-use-the-generic-get_user_pages_fast-code-fix.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/mips-use-the-generic-get_user_pages_fast-code-fix.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/mips-use-the-generic-get_user_pages_fast-code-fix.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Christoph Hellwig <hch@xxxxxx> Subject: MIPS: don't select ARCH_HAS_PTE_SPECIAL MIPS doesn't really have a proper pte_special implementation, just stubs. It turns out they were not enough to make get_user_pages_fast work, so drop the select. This means get_user_pages_fast won't actually use the fast path for non-hugepage mappings, so someone who actually knows about mips page table management should look into adding real pte_special support. Link: http://lkml.kernel.org/r/20190701151818.32227-3-hch@xxxxxx Fixes: eb9488e58bbc ("MIPS: use the generic get_user_pages_fast code") Signed-off-by: Christoph Hellwig <hch@xxxxxx> Reported-by: Guenter Roeck <linux@xxxxxxxxxxxx> Tested-by: Guenter Roeck <linux@xxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- arch/mips/Kconfig | 1 - 1 file changed, 1 deletion(-) --- a/arch/mips/Kconfig~mips-use-the-generic-get_user_pages_fast-code-fix +++ a/arch/mips/Kconfig @@ -6,7 +6,6 @@ config MIPS select ARCH_BINFMT_ELF_STATE if MIPS_FP_SUPPORT select ARCH_CLOCKSOURCE_DATA select ARCH_HAS_ELF_RANDOMIZE - select ARCH_HAS_PTE_SPECIAL select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_HAS_UBSAN_SANITIZE_ALL select ARCH_SUPPORTS_UPROBES _ Patches currently in -mm which might be from hch@xxxxxx are mm-remove-the-account_page_dirtied-export.patch mm-fix-an-overly-long-line-in-read_cache_page.patch mm-dont-cast-readpage-to-filler_t-for-do_read_cache_page.patch jffs2-pass-the-correct-prototype-to-read_cache_page.patch 9p-pass-the-correct-prototype-to-read_cache_page.patch mm-use-untagged_addr-for-get_user_pages_fast-addresses.patch mm-simplify-gup_fast_permitted.patch mm-lift-the-x86_32-pae-version-of-gup_get_pte-to-common-code.patch mips-use-the-generic-get_user_pages_fast-code.patch mips-use-the-generic-get_user_pages_fast-code-fix.patch sh-add-the-missing-pud_page-definition.patch sh-add-the-missing-pud_page-definition-fix.patch sh-use-the-generic-get_user_pages_fast-code.patch sparc64-add-the-missing-pgd_page-definition.patch sparc64-add-the-missing-pgd_page-definition-fix.patch sparc64-define-untagged_addr.patch sparc64-use-the-generic-get_user_pages_fast-code.patch mm-rename-config_have_generic_gup-to-config_have_fast_gup.patch mm-reorder-code-blocks-in-gupc.patch mm-consolidate-the-get_user_pages-implementations.patch mm-validate-get_user_pages_fast-flags.patch mm-move-the-powerpc-hugepd-code-to-mm-gupc.patch mm-switch-gup_hugepte-to-use-try_get_compound_head.patch mm-mark-the-page-referenced-in-gup_hugepte.patch