linux-kernel - [PATCH 3/5] mm: Allow FOLL_NUMA on FOLL

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Date:	Tue,  8 Apr 2014 14:09:28 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Linux-X86 <x86@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Mel Gorman <mgorman@...e.de>, Peter Anvin <hpa@...or.com>,
	Ingo Molnar <mingo@...nel.org>,
	Steven Noonan <steven@...inklabs.net>,
	Rik van Riel <riel@...hat.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 3/5] mm: Allow FOLL_NUMA on FOLL_FORCE

As _PAGE_NUMA is no longer aliased to _PAGE_PROTNONE there should be no
confusion between them. It should be possible to kick away the special
casing in __get_user_pages.

Signed-off-by: Mel Gorman <mgorman@...e.de>
---
 mm/memory.c | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 22dfa61..b9c35a7 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1714,18 +1714,6 @@ long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
 	vm_flags &= (gup_flags & FOLL_FORCE) ?
 			(VM_MAYREAD | VM_MAYWRITE) : (VM_READ | VM_WRITE);
 
-	/*
-	 * If FOLL_FORCE and FOLL_NUMA are both set, handle_mm_fault
-	 * would be called on PROT_NONE ranges. We must never invoke
-	 * handle_mm_fault on PROT_NONE ranges or the NUMA hinting
-	 * page faults would unprotect the PROT_NONE ranges if
-	 * _PAGE_NUMA and _PAGE_PROTNONE are sharing the same pte/pmd
-	 * bitflag. So to avoid that, don't set FOLL_NUMA if
-	 * FOLL_FORCE is set.
-	 */
-	if (!(gup_flags & FOLL_FORCE))
-		gup_flags |= FOLL_NUMA;
-
 	i = 0;
 
 	do {
-- 
1.8.4.5

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