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Patch "x86/mm: Remove flush_tlb() and flush_tlb_current_task()" has been added to the 4.4-stable tree

PATCH [email protected] 1 participant 1 message Dec 30, 2017

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This is a note to let you know that I've just added the patch titled

x86/mm: Remove flush_tlb() and flush_tlb_current_task()

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
x86-mm-remove-flush_tlb-and-flush_tlb_current_task.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

Quoted 1 line

From 29961b59a51f8c6838a26a45e871a7ed6771809b Mon Sep 17 00:00:00 2001

From: Andy Lutomirski <[email protected]>
Date: Sat, 22 Apr 2017 00:01:20 -0700
Subject: x86/mm: Remove flush_tlb() and flush_tlb_current_task()

From: Andy Lutomirski <[email protected]>

commit 29961b59a51f8c6838a26a45e871a7ed6771809b upstream.

I was trying to figure out what how flush_tlb_current_task() would possibly work correctly if current->mm != current->active_mm, but I realized I could spare myself the effort: it has no callers except the unused flush_tlb() macro.

Signed-off-by Andy Lutomirski <[email protected]>
Cc Andrew Morton <[email protected]>
Cc Borislav Petkov <[email protected]>
Cc Brian Gerst <[email protected]>
Cc Dave Hansen <[email protected]>
Cc Denys Vlasenko <[email protected]>
Cc H. Peter Anvin <[email protected]>
Cc Josh Poimboeuf <[email protected]>
Cc Linus Torvalds <[email protected]>
Cc Michal Hocko <[email protected]>
Cc Nadav Amit <[email protected]>
Cc Peter Zijlstra <[email protected]>
Cc Rik van Riel <[email protected]>
Cc Thomas Gleixner <[email protected]>
Link http://lkml.kernel.org/r/e52d64c11690f85e9f1d69d7b48cc2269cd2e94b.1492844372.git.luto@kernel.org open here
Signed-off-by Ingo Molnar <[email protected]>
Cc Hugh Dickins <[email protected]>
Signed-off-by Greg Kroah-Hartman <[email protected]>
---
 arch/x86/include/asm/tlbflush.h |    9 ---------
 arch/x86/mm/tlb.c               |   17 -----------------
 2 files changed, 26 deletions(-)
arch/x86/include/asm/tlbflush.h +0 -9
@@ -204,7 +204,6 @@ static inline void __flush_tlb_one(unsig
 /*
  * TLB flushing:
  *
- *  - flush_tlb() flushes the current mm struct TLBs
  *  - flush_tlb_all() flushes all processes TLBs
  *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
  *  - flush_tlb_page(vma, vmaddr) flushes one page

@@ -236,11 +235,6 @@ static inline void flush_tlb_all(void)
 	__flush_tlb_all();
 }
 
-static inline void flush_tlb(void)
-{
-	__flush_tlb_up();
-}
-
 static inline void local_flush_tlb(void)
 {
 	__flush_tlb_up();

@@ -302,14 +296,11 @@ static inline void flush_tlb_kernel_rang
 		flush_tlb_mm_range(vma->vm_mm, start, end, vma->vm_flags)
 
 extern void flush_tlb_all(void);
-extern void flush_tlb_current_task(void);
 extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
 extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
 				unsigned long end, unsigned long vmflag);
 extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
 
-#define flush_tlb()	flush_tlb_current_task()
-
 void native_flush_tlb_others(const struct cpumask *cpumask,
 				struct mm_struct *mm,
 				unsigned long start, unsigned long end);
arch/x86/mm/tlb.c +0 -17
@@ -272,23 +272,6 @@ void native_flush_tlb_others(const struc
 	smp_call_function_many(cpumask, flush_tlb_func, &info, 1);
 }
 
-void flush_tlb_current_task(void)
-{
-	struct mm_struct *mm = current->mm;
-
-	preempt_disable();
-
-	count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
-
-	/* This is an implicit full barrier that synchronizes with switch_mm. */
-	local_flush_tlb();
-
-	trace_tlb_flush(TLB_LOCAL_SHOOTDOWN, TLB_FLUSH_ALL);
-	if (cpumask_any_but(mm_cpumask(mm), smp_processor_id()) < nr_cpu_ids)
-		flush_tlb_others(mm_cpumask(mm), mm, 0UL, TLB_FLUSH_ALL);
-	preempt_enable();
-}
-
 /*
  * See Documentation/x86/tlb.txt for details.  We choose 33
  * because it is large enough to cover the vast majority (at

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/x86-vm86-32-switch-to-flush_tlb_mm_range-in-mark_screen_rdonly.patch queue-4.4/x86-mm-make-flush_tlb_mm_range-more-predictable.patch queue-4.4/x86-mm-remove-flush_tlb-and-flush_tlb_current_task.patch