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powerpc/mm: Properly wire up get_user_pages_fast() on 32-bit 

While we did add support for _PAGE_SPECIAL on some 32-bit platforms,
we never actually built get_user_pages_fast() on them. This fixes
it which requires a little bit of ifdef'ing around.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2009-03-10 17:24:37 +00:00
parent 353bca5ed4
commit 9e5efaa936
2 changed files with 17 additions and 3 deletions
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4
arch/powerpc/mm/Makefile
View File

@ -6,7 +6,7 @@ ifeq ($(CONFIG_PPC64),y)
EXTRA_CFLAGS += -mno-minimal-toc
endif
obj-y := fault.o mem.o pgtable.o \
obj-y := fault.o mem.o pgtable.o gup.o \
init_$(CONFIG_WORD_SIZE).o \
pgtable_$(CONFIG_WORD_SIZE).o
obj-$(CONFIG_PPC_MMU_NOHASH) += mmu_context_nohash.o tlb_nohash.o \
@ -14,7 +14,7 @@ obj-$(CONFIG_PPC_MMU_NOHASH) += mmu_context_nohash.o tlb_nohash.o \
hash-$(CONFIG_PPC_NATIVE) := hash_native_64.o
obj-$(CONFIG_PPC64) += hash_utils_64.o \
slb_low.o slb.o stab.o \
gup.o mmap.o $(hash-y)
mmap.o $(hash-y)
obj-$(CONFIG_PPC_STD_MMU_32) += ppc_mmu_32.o
obj-$(CONFIG_PPC_STD_MMU) += hash_low_$(CONFIG_WORD_SIZE).o \
tlb_hash$(CONFIG_WORD_SIZE).o \

16
arch/powerpc/mm/gup.c
View File

@ -14,6 +14,8 @@
#include <linux/rwsem.h>
#include <asm/pgtable.h>
#ifdef __HAVE_ARCH_PTE_SPECIAL
/*
* The performance critical leaf functions are made noinline otherwise gcc
* inlines everything into a single function which results in too much
@ -151,8 +153,11 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
unsigned long addr, len, end;
unsigned long next;
pgd_t *pgdp;
int psize, nr = 0;
int nr = 0;
#ifdef CONFIG_PPC64
unsigned int shift;
int psize;
#endif
pr_debug("%s(%lx,%x,%s)\n", __func__, start, nr_pages, write ? "write" : "read");
@ -205,8 +210,13 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
*/
local_irq_disable();
#ifdef CONFIG_PPC64
/* Those bits are related to hugetlbfs implementation and only exist
* on 64-bit for now
*/
psize = get_slice_psize(mm, addr);
shift = mmu_psize_defs[psize].shift;
#endif /* CONFIG_PPC64 */
#ifdef CONFIG_HUGETLB_PAGE
if (unlikely(mmu_huge_psizes[psize])) {
@ -236,7 +246,9 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
do {
pgd_t pgd = *pgdp;
#ifdef CONFIG_PPC64
VM_BUG_ON(shift != mmu_psize_defs[get_slice_psize(mm, addr)].shift);
#endif
pr_debug(" %016lx: normal pgd %p\n", addr,
(void *)pgd_val(pgd));
next = pgd_addr_end(addr, end);
@ -279,3 +291,5 @@ slow_irqon:
return ret;
}
}
#endif /* __HAVE_ARCH_PTE_SPECIAL */