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>
diff --git a/arch/powerpc/mm/gup.c b/arch/powerpc/mm/gup.c
index 28a114d..bc400c7 100644
--- a/arch/powerpc/mm/gup.c
+++ b/arch/powerpc/mm/gup.c
@@ -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 @@
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 @@
*/
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 @@
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 @@
return ret;
}
}
+
+#endif /* __HAVE_ARCH_PTE_SPECIAL */