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asm-generic/tlb, arch: Invert CONFIG_HAVE_RCU_TABLE_INVALIDATE

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Make issuing a TLB invalidate for page-table pages the normal case.

The reason is twofold:

 - too many invalidates is safer than too few,
 - most architectures use the linux page-tables natively
   and would thus require this.

Make it an opt-out, instead of an opt-in.

No change in behavior intended.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2018-09-19 13:24:41 +02:00 committed by Ingo Molnar
parent 8b6dd0c478
commit 96bc9567cb
7 changed files with 9 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/Kconfig
View File

@ -383,7 +383,7 @@ config HAVE_ARCH_JUMP_LABEL_RELATIVE
config HAVE_RCU_TABLE_FREE
bool
config HAVE_RCU_TABLE_INVALIDATE
config HAVE_RCU_TABLE_NO_INVALIDATE
bool
config HAVE_MMU_GATHER_PAGE_SIZE

1
arch/arm64/Kconfig
View File

@ -149,7 +149,6 @@ config ARM64
select HAVE_PERF_USER_STACK_DUMP
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_RCU_TABLE_FREE
select HAVE_RCU_TABLE_INVALIDATE
select HAVE_RSEQ
select HAVE_STACKPROTECTOR
select HAVE_SYSCALL_TRACEPOINTS

1
arch/powerpc/Kconfig
View File

@ -218,6 +218,7 @@ config PPC
select HAVE_PERF_REGS
select HAVE_PERF_USER_STACK_DUMP
select HAVE_RCU_TABLE_FREE if SMP
select HAVE_RCU_TABLE_NO_INVALIDATE if HAVE_RCU_TABLE_FREE
select HAVE_MMU_GATHER_PAGE_SIZE
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN

1
arch/sparc/Kconfig
View File

@ -63,6 +63,7 @@ config SPARC64
select HAVE_KRETPROBES
select HAVE_KPROBES
select HAVE_RCU_TABLE_FREE if SMP
select HAVE_RCU_TABLE_NO_INVALIDATE if HAVE_RCU_TABLE_FREE
select HAVE_MEMBLOCK_NODE_MAP
select HAVE_ARCH_TRANSPARENT_HUGEPAGE
select HAVE_DYNAMIC_FTRACE

1
arch/x86/Kconfig
View File

@ -183,7 +183,6 @@ config X86
select HAVE_PERF_REGS
select HAVE_PERF_USER_STACK_DUMP
select HAVE_RCU_TABLE_FREE if PARAVIRT
select HAVE_RCU_TABLE_INVALIDATE if HAVE_RCU_TABLE_FREE
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_RELIABLE_STACKTRACE if X86_64 && (UNWINDER_FRAME_POINTER || UNWINDER_ORC) && STACK_VALIDATION
select HAVE_FUNCTION_ARG_ACCESS_API

9
include/asm-generic/tlb.h
View File

@ -135,11 +135,12 @@
* When used, an architecture is expected to provide __tlb_remove_table()
* which does the actual freeing of these pages.
*
* HAVE_RCU_TABLE_INVALIDATE
* HAVE_RCU_TABLE_NO_INVALIDATE
*
* This makes HAVE_RCU_TABLE_FREE call tlb_flush_mmu_tlbonly() before freeing
* the page-table pages. Required if you use HAVE_RCU_TABLE_FREE and your
* architecture uses the Linux page-tables natively.
* This makes HAVE_RCU_TABLE_FREE avoid calling tlb_flush_mmu_tlbonly() before
* freeing the page-table pages. This can be avoided if you use
* HAVE_RCU_TABLE_FREE and your architecture does _NOT_ use the Linux
* page-tables natively.
*
* MMU_GATHER_NO_RANGE
*

2
mm/mmu_gather.c
View File

@ -157,7 +157,7 @@ bool __tlb_remove_page_size(struct mmu_gather *tlb, struct page *page, int page_
*/
static inline void tlb_table_invalidate(struct mmu_gather *tlb)
{
#ifdef CONFIG_HAVE_RCU_TABLE_INVALIDATE
#ifndef CONFIG_HAVE_RCU_TABLE_NO_INVALIDATE
/*
* Invalidate page-table caches used by hardware walkers. Then we still
* need to RCU-sched wait while freeing the pages because software