Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 4a0100f7 authored by David S. Miller's avatar David S. Miller Committed by Linus Torvalds
Browse files

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: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 4dedbf8d

arch/sparc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/sparc/include/asm/pgalloc_64.h

+46 −2
Original line number Diff line number Diff line
@@ -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 */