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powerpc/mm: refactor definition of pgtable_cache[]

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pgtable_cache[] is the same for the 4 subarches, lets make it common.

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2019-04-26 15:58:09 +00:00 • committed by Michael Ellerman
parent dc096864ba
commit e80789a3c1
5 changed files with 21 additions and 86 deletions
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21
arch/powerpc/include/asm/pgalloc.h
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@ -45,6 +45,27 @@ static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
pte_fragment_free((unsigned long *)ptepage, 0);
}
/*
* Functions that deal with pagetables that could be at any level of
* the table need to be passed an "index_size" so they know how to
* handle allocation. For PTE pages, the allocation size will be
* (2^index_size * sizeof(pointer)) and allocations are drawn from
* the kmem_cache in PGT_CACHE(index_size).
*
* The maximum index size needs to be big enough to allow any
* pagetable sizes we need, but small enough to fit in the low bits of
* any page table pointer. In other words all pagetables, even tiny
* ones, must be aligned to allow at least enough low 0 bits to
* contain this value. This value is also used as a mask, so it must
* be one less than a power of two.
*/
#define MAX_PGTABLE_INDEX_SIZE 0xf
extern struct kmem_cache *pgtable_cache[];
#define PGT_CACHE(shift) pgtable_cache[shift]
static inline void check_pgt_cache(void) { }
#ifdef CONFIG_PPC_BOOK3S
#include <asm/book3s/pgalloc.h>
#else