summaryrefslogtreecommitdiff
path: root/arch/powerpc/mm
diff options
context:
space:
mode:
authorLEROY Christophe <christophe.leroy@c-s.fr>2015-01-20 10:57:34 +0100
committerScott Wood <scottwood@freescale.com>2015-01-29 21:59:02 -0600
commitce67f5d0a00cce231e62334c3624737623c32d6a (patch)
treec723a98f0acfe0e685727ff602f901ea70ce984e /arch/powerpc/mm
parent5ddb75cee5afab3bdaf6eb4efefc8029923a9cc7 (diff)
powerpc32: Use kmem_cache memory for PGDIR
When pages are not 4K, PGDIR table is allocated with kmalloc(). In order to optimise TLB handlers, aligned memory is needed. kmalloc() doesn't provide aligned memory blocks, so lets use a kmem_cache pool instead. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'arch/powerpc/mm')
-rw-r--r--arch/powerpc/mm/pgtable_32.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index 833139620431..03b1a3b0fbd5 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -72,13 +72,25 @@ extern unsigned long p_mapped_by_tlbcam(phys_addr_t pa);
#define PGDIR_ORDER (32 + PGD_T_LOG2 - PGDIR_SHIFT)
+#ifndef CONFIG_PPC_4K_PAGES
+static struct kmem_cache *pgtable_cache;
+
+void pgtable_cache_init(void)
+{
+ pgtable_cache = kmem_cache_create("PGDIR cache", 1 << PGDIR_ORDER,
+ 1 << PGDIR_ORDER, 0, NULL);
+ if (pgtable_cache == NULL)
+ panic("Couldn't allocate pgtable caches");
+}
+#endif
+
pgd_t *pgd_alloc(struct mm_struct *mm)
{
pgd_t *ret;
/* pgdir take page or two with 4K pages and a page fraction otherwise */
#ifndef CONFIG_PPC_4K_PAGES
- ret = kzalloc(1 << PGDIR_ORDER, GFP_KERNEL);
+ ret = kmem_cache_alloc(pgtable_cache, GFP_KERNEL | __GFP_ZERO);
#else
ret = (pgd_t *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
PGDIR_ORDER - PAGE_SHIFT);
@@ -89,7 +101,7 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
#ifndef CONFIG_PPC_4K_PAGES
- kfree((void *)pgd);
+ kmem_cache_free(pgtable_cache, (void *)pgd);
#else
free_pages((unsigned long)pgd, PGDIR_ORDER - PAGE_SHIFT);
#endif