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
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------------------------------------------------------
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
