On Mon, Jul 01, 2019 at 05:18:18PM +0200, Christoph Hellwig wrote:
> 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.
>
> Fixes: eb9488e58bbc ("MIPS: use the generic get_user_pages_fast code")
> Reported-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Tested-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> ---
> arch/mips/Kconfig | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index b1e42f0e4ed0..7957d3457156 100644
> --- a/arch/mips/Kconfig
> +++ b/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
> --
> 2.20.1
>
