diff mbox series

[3/6] asm-generic/tlb, arch: Invert CONFIG_HAVE_RCU_TABLE_INVALIDATE

Message ID 20200220084229.1278137-4-santosh@fossix.org (mailing list archive)
State Not Applicable
Headers show
Series Memory corruption may occur due to incorrent tlb flush | expand

Checks

Context Check Description
snowpatch_ozlabs/apply_patch warning Failed to apply on branch powerpc/merge (65b2623f395a4e25ab3ff4cff1c9c7623619a22d)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch powerpc/next (71c3a888cbcaf453aecf8d2f8fb003271d28073f)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch linus/master (ca7e1fd1026c5af6a533b4b5447e1d2f153e28f2)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch powerpc/fixes (9eb425b2e04e0e3006adffea5bf5f227a896f128)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch linux-next (f4aba10148cd290bbbf4d0efae0e9789a13c2778)
snowpatch_ozlabs/apply_patch fail Failed to apply to any branch

Commit Message

Santosh Sivaraj Feb. 20, 2020, 8:42 a.m. UTC 
From: Peter Zijlstra <peterz@infradead.org>

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.

96bc9567cbe1 in upstream.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: <stable@vger.kernel.org> # 4.19
Signed-off-by: Santosh Sivaraj <santosh@fossix.org>
[santosh: prerequisite for upcoming tlbflush backports]
---
 arch/Kconfig         | 2 +-
 arch/powerpc/Kconfig | 1 +
 arch/sparc/Kconfig   | 1 +
 arch/x86/Kconfig     | 1 -
 mm/memory.c          | 2 +-
 5 files changed, 4 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/arch/Kconfig b/arch/Kconfig
index a336548487e6..061a12b8140e 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -363,7 +363,7 @@  config HAVE_ARCH_JUMP_LABEL
 config HAVE_RCU_TABLE_FREE
 	bool
 
-config HAVE_RCU_TABLE_INVALIDATE
+config HAVE_RCU_TABLE_NO_INVALIDATE
 	bool
 
 config ARCH_HAVE_NMI_SAFE_CMPXCHG
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index a80669209155..f7f046ff6407 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -216,6 +216,7 @@  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_REGS_AND_STACK_ACCESS_API
 	select HAVE_RELIABLE_STACKTRACE		if PPC64 && CPU_LITTLE_ENDIAN
 	select HAVE_SYSCALL_TRACEPOINTS
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index e6f2a38d2e61..d90d632868aa 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -64,6 +64,7 @@  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
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index af35f5caadbe..181d0d522977 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -181,7 +181,6 @@  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_STACKPROTECTOR		if CC_HAS_SANE_STACKPROTECTOR
diff --git a/mm/memory.c b/mm/memory.c
index 1832c5ed6ac0..ba5689610c04 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -327,7 +327,7 @@  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