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powerpc/mm: enable the use of page table cache of order 0 

hugepages uses a cache of order 0. Lets allow page tables
of order 0 in the common part in order to avoid open coding
in hugetlb

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 2018-11-29 14:07:03 +00:00 committed by Michael Ellerman
parent 32ea4c1499
commit 129dd323dd
5 changed files with 7 additions and 19 deletions
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5
arch/powerpc/include/asm/book3s/32/pgalloc.h
View File

@ -25,10 +25,7 @@
extern void __bad_pte(pmd_t *pmd);
extern struct kmem_cache *pgtable_cache[];
#define PGT_CACHE(shift) ({ \
BUG_ON(!(shift)); \
pgtable_cache[(shift) - 1]; \
})
#define PGT_CACHE(shift) pgtable_cache[shift]
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{

5
arch/powerpc/include/asm/book3s/64/pgalloc.h
View File

@ -37,10 +37,7 @@ extern struct vmemmap_backing *vmemmap_list;
#define MAX_PGTABLE_INDEX_SIZE 0xf
extern struct kmem_cache *pgtable_cache[];
#define PGT_CACHE(shift) ({ \
BUG_ON(!(shift)); \
pgtable_cache[(shift) - 1]; \
})
#define PGT_CACHE(shift) pgtable_cache[shift]
extern pte_t *pte_fragment_alloc(struct mm_struct *, unsigned long, int);
extern pmd_t *pmd_fragment_alloc(struct mm_struct *, unsigned long);

5
arch/powerpc/include/asm/nohash/32/pgalloc.h
View File

@ -25,10 +25,7 @@
extern void __bad_pte(pmd_t *pmd);
extern struct kmem_cache *pgtable_cache[];
#define PGT_CACHE(shift) ({ \
BUG_ON(!(shift)); \
pgtable_cache[(shift) - 1]; \
})
#define PGT_CACHE(shift) pgtable_cache[shift]
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{

5
arch/powerpc/include/asm/nohash/64/pgalloc.h
View File

@ -36,10 +36,7 @@ extern struct vmemmap_backing *vmemmap_list;
#define MAX_PGTABLE_INDEX_SIZE 0xf
extern struct kmem_cache *pgtable_cache[];
#define PGT_CACHE(shift) ({ \
BUG_ON(!(shift)); \
pgtable_cache[(shift) - 1]; \
})
#define PGT_CACHE(shift) pgtable_cache[shift]
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{

6
arch/powerpc/mm/init-common.c
View File

@ -40,7 +40,7 @@ static void pmd_ctor(void *addr)
memset(addr, 0, PMD_TABLE_SIZE);
}
struct kmem_cache *pgtable_cache[MAX_PGTABLE_INDEX_SIZE];
struct kmem_cache *pgtable_cache[MAX_PGTABLE_INDEX_SIZE + 1];
EXPORT_SYMBOL_GPL(pgtable_cache); /* used by kvm_hv module */
/*
@ -71,7 +71,7 @@ void pgtable_cache_add(unsigned shift, void (*ctor)(void *))
* moment, gcc doesn't seem to recognize is_power_of_2 as a
* constant expression, so so much for that. */
BUG_ON(!is_power_of_2(minalign));
BUG_ON((shift < 1) || (shift > MAX_PGTABLE_INDEX_SIZE));
BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
if (PGT_CACHE(shift))
return; /* Already have a cache of this size */
@ -83,7 +83,7 @@ void pgtable_cache_add(unsigned shift, void (*ctor)(void *))
panic("Could not allocate pgtable cache for order %d", shift);
kfree(name);
pgtable_cache[shift - 1] = new;
pgtable_cache[shift] = new;
pr_debug("Allocated pgtable cache for order %d\n", shift);
}