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powerpc/mm/radix: Add checks in slice code to catch radix usage 

Radix doesn't need slice support. Catch incorrect usage of slice code
when radix is enabled.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V 2016-04-29 23:26:09 +10:00 committed by Michael Ellerman
parent d8c476eeb6
commit 764041e0f4
1 changed files with 16 additions and 0 deletions
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16
arch/powerpc/mm/slice.c
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@ -395,6 +395,7 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
/* Sanity checks */
BUG_ON(mm->task_size == 0);
VM_BUG_ON(radix_enabled());
slice_dbg("slice_get_unmapped_area(mm=%p, psize=%d...\n", mm, psize);
slice_dbg(" addr=%lx, len=%lx, flags=%lx, topdown=%d\n",
@ -568,6 +569,16 @@ unsigned int get_slice_psize(struct mm_struct *mm, unsigned long addr)
unsigned char *hpsizes;
int index, mask_index;
/*
* Radix doesn't use slice, but can get enabled along with MMU_SLICE
*/
if (radix_enabled()) {
#ifdef CONFIG_PPC_64K_PAGES
return MMU_PAGE_64K;
#else
return MMU_PAGE_4K;
#endif
}
if (addr < SLICE_LOW_TOP) {
u64 lpsizes;
lpsizes = mm->context.low_slices_psize;
@ -605,6 +616,7 @@ void slice_set_user_psize(struct mm_struct *mm, unsigned int psize)
slice_dbg("slice_set_user_psize(mm=%p, psize=%d)\n", mm, psize);
VM_BUG_ON(radix_enabled());
spin_lock_irqsave(&slice_convert_lock, flags);
old_psize = mm->context.user_psize;
@ -649,6 +661,7 @@ void slice_set_range_psize(struct mm_struct *mm, unsigned long start,
{
struct slice_mask mask = slice_range_to_mask(start, len);
VM_BUG_ON(radix_enabled());
slice_convert(mm, mask, psize);
}
@ -678,6 +691,9 @@ int is_hugepage_only_range(struct mm_struct *mm, unsigned long addr,
struct slice_mask mask, available;
unsigned int psize = mm->context.user_psize;
if (radix_enabled())
return 0;
mask = slice_range_to_mask(addr, len);
available = slice_mask_for_size(mm, psize);
#ifdef CONFIG_PPC_64K_PAGES