xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc/mm: Fix bug in pagetable cache cleanup with CONFIG_PPC_SUBPAGE_PROT

Browse Source 
Commit a0668cdc15 cleans up the handling
of kmem_caches for allocating various levels of pagetables.
Unfortunately, it conflicts badly with CONFIG_PPC_SUBPAGE_PROT, due to
the latter's cleverly hidden technique of adding some extra allocation
space to the top level page directory to store the extra information
it needs.

Since that extra allocation really doesn't fit into the cleaned up
page directory allocating scheme, this patch alters
CONFIG_PPC_SUBPAGE_PROT to instead allocate its struct
subpage_prot_table as part of the mm_context_t.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
David Gibson
2009-11-23 19:31:14 +00:00
committed by Benjamin Herrenschmidt
parent 1e43bee9c7
commit c045256d14
6 changed files with 51 additions and 49 deletions
Download Patch File Download Diff File Expand all files Collapse all files

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

@@ -28,10 +28,6 @@
*/
#define MAX_PGTABLE_INDEX_SIZE 0xf
#ifndef CONFIG_PPC_SUBPAGE_PROT
static inline void subpage_prot_free(pgd_t *pgd) {}
#endif
extern struct kmem_cache *pgtable_cache[];
#define PGT_CACHE(shift) (pgtable_cache[(shift)-1])
@@ -42,7 +38,6 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
subpage_prot_free(pgd);
kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
}