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c7bd8010a3
If __tlb_remove_tlb_entry() is not defined by the architecture then we provide an empty definition in asm-generic/tlb.h. Remove the redundant empty definitions for sparc64 and x86. Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Will Deacon <will@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Yu Zhao <yuzhao@google.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lkml.kernel.org/r/20210127235347.1402-6-will@kernel.org
40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_TLB_H
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#define _ASM_X86_TLB_H
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#define tlb_start_vma(tlb, vma) do { } while (0)
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#define tlb_end_vma(tlb, vma) do { } while (0)
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#define tlb_flush tlb_flush
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static inline void tlb_flush(struct mmu_gather *tlb);
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#include <asm-generic/tlb.h>
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static inline void tlb_flush(struct mmu_gather *tlb)
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{
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unsigned long start = 0UL, end = TLB_FLUSH_ALL;
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unsigned int stride_shift = tlb_get_unmap_shift(tlb);
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if (!tlb->fullmm && !tlb->need_flush_all) {
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start = tlb->start;
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end = tlb->end;
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}
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flush_tlb_mm_range(tlb->mm, start, end, stride_shift, tlb->freed_tables);
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}
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/*
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* While x86 architecture in general requires an IPI to perform TLB
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* shootdown, enablement code for several hypervisors overrides
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* .flush_tlb_others hook in pv_mmu_ops and implements it by issuing
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* a hypercall. To keep software pagetable walkers safe in this case we
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* switch to RCU based table free (MMU_GATHER_RCU_TABLE_FREE). See the comment
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* below 'ifdef CONFIG_MMU_GATHER_RCU_TABLE_FREE' in include/asm-generic/tlb.h
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* for more details.
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*/
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static inline void __tlb_remove_table(void *table)
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{
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free_page_and_swap_cache(table);
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}
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#endif /* _ASM_X86_TLB_H */
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