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sparc64: use RCU page table freeing 

Make use of the generic RCU page table freeing on Sparc64, doing so allows
for race-free software page-table walkers like gup_fast().

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David S. Miller 2011-07-25 17:12:21 -07:00 committed by Linus Torvalds
parent 4dedbf8dc1
commit 4a0100f754
2 changed files with 47 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/sparc/Kconfig
View File

@ -41,6 +41,7 @@ config SPARC64
select HAVE_FUNCTION_TRACE_MCOUNT_TEST
select HAVE_KRETPROBES
select HAVE_KPROBES
select HAVE_RCU_TABLE_FREE if SMP
select HAVE_MEMBLOCK
select HAVE_SYSCALL_WRAPPERS
select HAVE_DYNAMIC_FTRACE

48
arch/sparc/include/asm/pgalloc_64.h
View File

@ -76,7 +76,51 @@ static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
#define check_pgt_cache() do { } while (0)
#define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, pte)
#define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tlb)->mm, pmd)
static inline void pgtable_free(void *table, bool is_page)
{
if (is_page)
free_page((unsigned long)table);
else
kmem_cache_free(pgtable_cache, table);
}
#ifdef CONFIG_SMP
struct mmu_gather;
extern void tlb_remove_table(struct mmu_gather *, void *);
static inline void pgtable_free_tlb(struct mmu_gather *tlb, void *table, bool is_page)
{
unsigned long pgf = (unsigned long)table;
if (is_page)
pgf |= 0x1UL;
tlb_remove_table(tlb, (void *)pgf);
}
static inline void __tlb_remove_table(void *_table)
{
void *table = (void *)((unsigned long)_table & ~0x1UL);
bool is_page = false;
if ((unsigned long)_table & 0x1UL)
is_page = true;
pgtable_free(table, is_page);
}
#else /* CONFIG_SMP */
static inline void pgtable_free_tlb(struct mmu_gather *tlb, void *table, bool is_page)
{
pgtable_free(table, is_page);
}
#endif /* !CONFIG_SMP */
static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *ptepage,
unsigned long address)
{
pgtable_page_dtor(ptepage);
pgtable_free_tlb(tlb, page_address(ptepage), true);
}
#define __pmd_free_tlb(tlb, pmd, addr) \
pgtable_free_tlb(tlb, pmd, false)
#endif /* _SPARC64_PGALLOC_H */