| Message ID | 20190701151818.32227-3-hch@lst.de (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | [1/2] sh: stub out pud_page | expand |
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@roeck-us.net> > Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Guenter Roeck <linux@roeck-us.net> > --- > 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 >
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
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@roeck-us.net> Signed-off-by: Christoph Hellwig <hch@lst.de> --- arch/mips/Kconfig | 1 - 1 file changed, 1 deletion(-)