linux-kernel - Re: [PATCH -V6 04/14] hugetlb: Use mmu_gather instead of a temporary linked list for accumulating pages

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Date:	Mon, 23 Apr 2012 16:44:05 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	linux-mm@...ck.org, mgorman@...e.de,
	kamezawa.hiroyu@...fujitsu.com, dhillf@...il.com,
	aarcange@...hat.com, mhocko@...e.cz, hannes@...xchg.org,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [PATCH -V6 04/14] hugetlb: Use mmu_gather instead of a
 temporary linked list for accumulating pages

On Mon, 16 Apr 2012 16:14:41 +0530
"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com> wrote:

> From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
> 
> Use mmu_gather instead of temporary linked list for accumulating pages when
> we unmap a hugepage range. This also allows us to get rid of i_mmap_mutex
> unmap_hugepage_range in the following patch.
> 

Another warning and a build error, due to inadequate coverage testing.

mm/memory.c: In function 'unmap_single_vma':
mm/memory.c:1334: error: implicit declaration of function '__unmap_hugepage_range'

--- a/include/linux/hugetlb.h~hugetlb-use-mmu_gather-instead-of-a-temporary-linked-list-for-accumulating-pages-fix
+++ a/include/linux/hugetlb.h
@@ -41,8 +41,9 @@ int follow_hugetlb_page(struct mm_struct
 			unsigned long *, int *, int, unsigned int flags);
 void unmap_hugepage_range(struct vm_area_struct *,
 			  unsigned long, unsigned long, struct page *);
-void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *,
-			    unsigned long, unsigned long, struct page *);
+void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vms,
+				unsigned long start, unsigned long end,
+				struct page *ref_page);
 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
 void hugetlb_report_meminfo(struct seq_file *);
 int hugetlb_report_node_meminfo(int, char *);
@@ -119,6 +120,12 @@ static inline void copy_huge_page(struct
 
 #define hugetlb_change_protection(vma, address, end, newprot)
 
+static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
+			struct vm_area_struct *vma, unsigned long start,
+			unsigned long end, struct page *ref_page)
+{
+}
+
 #endif /* !CONFIG_HUGETLB_PAGE */
 
 #define HUGETLB_ANON_FILE "anon_hugepage"


I also fixed up that __unmap_hugepage_range() declaration - it's quite
maddening to work on and review and read code when people have gone and
left out the names of the arguments.

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