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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
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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
*