From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail203.messagelabs.com (mail203.messagelabs.com [216.82.254.243]) by kanga.kvack.org (Postfix) with ESMTP id 11DD06B0082 for ; Tue, 12 Jul 2011 08:34:13 -0400 (EDT) Message-Id: <20110712122911.646230694@chello.nl> Date: Tue, 12 Jul 2011 14:26:10 +0200 From: Peter Zijlstra Subject: [PATCH 2/4] sparc64: Use RCU page table freeing. References: <20110712122608.938583937@chello.nl> Content-Disposition: inline; filename=davem-sparc64-Use_RCU_page_table_freeing.patch Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: Linux-MM , LKML , David Miller , Peter Zijlstra 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 Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/20100408.180008.180206930.davem@davemloft.net --- arch/sparc/Kconfig | 1 arch/sparc/include/asm/pgalloc_64.h | 48 ++++++++++++++++++++++++++++++++++-- 2 files changed, 47 insertions(+), 2 deletions(-) Index: linux-2.6/arch/sparc/include/asm/pgalloc_64.h =================================================================== --- linux-2.6.orig/arch/sparc/include/asm/pgalloc_64.h +++ linux-2.6/arch/sparc/include/asm/pgalloc_64.h @@ -76,7 +76,51 @@ static inline void pte_free(struct mm_st #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 */ Index: linux-2.6/arch/sparc/Kconfig =================================================================== --- linux-2.6.orig/arch/sparc/Kconfig +++ linux-2.6/arch/sparc/Kconfig @@ -53,6 +53,7 @@ config SPARC64 select HAVE_PERF_EVENTS select PERF_USE_VMALLOC select IRQ_PREFLOW_FASTEOI + select HAVE_RCU_TABLE_FREE if SMP config ARCH_DEFCONFIG string -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org