The patch titled
mm: change direct call of spin_lock(anon_vma->lock) to inline function
has been added to the -mm tree. Its filename is
mm-change-direct-call-of-spin_lockanon_vma-lock-to-inline-function.patch
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out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: mm: change direct call of spin_lock(anon_vma->lock) to inline function
From: Rik van Riel <riel@xxxxxxxxxx>
Subsitute a direct call of spin_lock(anon_vma->lock) with an inline
function doing exactly the same.
This makes it easier to do the substitution to the root anon_vma lock in a
following patch.
We will deal with the handful of special locks (nested, dec_and_lock, etc)
separately.
Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>
Acked-by: Mel Gorman <mel@xxxxxxxxx>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Tested-by: Larry Woodman <lwoodman@xxxxxxxxxx>
Acked-by: Larry Woodman <lwoodman@xxxxxxxxxx>
Reviewed-by: Minchan Kim <minchan.kim@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/rmap.h | 10 ++++++++++
mm/ksm.c | 18 +++++++++---------
mm/migrate.c | 2 +-
mm/mmap.c | 2 +-
mm/rmap.c | 22 +++++++++++-----------
5 files changed, 32 insertions(+), 22 deletions(-)
diff -puN include/linux/rmap.h~mm-change-direct-call-of-spin_lockanon_vma-lock-to-inline-function include/linux/rmap.h
--- a/include/linux/rmap.h~mm-change-direct-call-of-spin_lockanon_vma-lock-to-inline-function
+++ a/include/linux/rmap.h
@@ -113,6 +113,16 @@ static inline void vma_unlock_anon_vma(s
spin_unlock(&anon_vma->lock);
}
+static inline void anon_vma_lock(struct anon_vma *anon_vma)
+{
+ spin_lock(&anon_vma->lock);
+}
+
+static inline void anon_vma_unlock(struct anon_vma *anon_vma)
+{
+ spin_unlock(&anon_vma->lock);
+}
+
/*
* anon_vma helper functions.
*/
diff -puN mm/ksm.c~mm-change-direct-call-of-spin_lockanon_vma-lock-to-inline-function mm/ksm.c
--- a/mm/ksm.c~mm-change-direct-call-of-spin_lockanon_vma-lock-to-inline-function
+++ a/mm/ksm.c
@@ -327,7 +327,7 @@ static void drop_anon_vma(struct rmap_it
if (atomic_dec_and_lock(&anon_vma->external_refcount, &anon_vma->lock)) {
int empty = list_empty(&anon_vma->head);
- spin_unlock(&anon_vma->lock);
+ anon_vma_unlock(anon_vma);
if (empty)
anon_vma_free(anon_vma);
}
@@ -1566,7 +1566,7 @@ again:
struct anon_vma_chain *vmac;
struct vm_area_struct *vma;
- spin_lock(&anon_vma->lock);
+ anon_vma_lock(anon_vma);
list_for_each_entry(vmac, &anon_vma->head, same_anon_vma) {
vma = vmac->vma;
if (rmap_item->address < vma->vm_start ||
@@ -1589,7 +1589,7 @@ again:
if (!search_new_forks || !mapcount)
break;
}
- spin_unlock(&anon_vma->lock);
+ anon_vma_unlock(anon_vma);
if (!mapcount)
goto out;
}
@@ -1619,7 +1619,7 @@ again:
struct anon_vma_chain *vmac;
struct vm_area_struct *vma;
- spin_lock(&anon_vma->lock);
+ anon_vma_lock(anon_vma);
list_for_each_entry(vmac, &anon_vma->head, same_anon_vma) {
vma = vmac->vma;
if (rmap_item->address < vma->vm_start ||
@@ -1637,11 +1637,11 @@ again:
ret = try_to_unmap_one(page, vma,
rmap_item->address, flags);
if (ret != SWAP_AGAIN || !page_mapped(page)) {
- spin_unlock(&anon_vma->lock);
+ anon_vma_unlock(anon_vma);
goto out;
}
}
- spin_unlock(&anon_vma->lock);
+ anon_vma_unlock(anon_vma);
}
if (!search_new_forks++)
goto again;
@@ -1671,7 +1671,7 @@ again:
struct anon_vma_chain *vmac;
struct vm_area_struct *vma;
- spin_lock(&anon_vma->lock);
+ anon_vma_lock(anon_vma);
list_for_each_entry(vmac, &anon_vma->head, same_anon_vma) {
vma = vmac->vma;
if (rmap_item->address < vma->vm_start ||
@@ -1688,11 +1688,11 @@ again:
ret = rmap_one(page, vma, rmap_item->address, arg);
if (ret != SWAP_AGAIN) {
- spin_unlock(&anon_vma->lock);
+ anon_vma_unlock(anon_vma);
goto out;
}
}
- spin_unlock(&anon_vma->lock);
+ anon_vma_unlock(anon_vma);
}
if (!search_new_forks++)
goto again;
diff -puN mm/migrate.c~mm-change-direct-call-of-spin_lockanon_vma-lock-to-inline-function mm/migrate.c
--- a/mm/migrate.c~mm-change-direct-call-of-spin_lockanon_vma-lock-to-inline-function
+++ a/mm/migrate.c
@@ -684,7 +684,7 @@ rcu_unlock:
/* Drop an anon_vma reference if we took one */
if (anon_vma && atomic_dec_and_lock(&anon_vma->external_refcount, &anon_vma->lock)) {
int empty = list_empty(&anon_vma->head);
- spin_unlock(&anon_vma->lock);
+ anon_vma_unlock(anon_vma);
if (empty)
anon_vma_free(anon_vma);
}
diff -puN mm/mmap.c~mm-change-direct-call-of-spin_lockanon_vma-lock-to-inline-function mm/mmap.c
--- a/mm/mmap.c~mm-change-direct-call-of-spin_lockanon_vma-lock-to-inline-function
+++ a/mm/mmap.c
@@ -2589,7 +2589,7 @@ static void vm_unlock_anon_vma(struct an
if (!__test_and_clear_bit(0, (unsigned long *)
&anon_vma->head.next))
BUG();
- spin_unlock(&anon_vma->lock);
+ anon_vma_unlock(anon_vma);
}
}
diff -puN mm/rmap.c~mm-change-direct-call-of-spin_lockanon_vma-lock-to-inline-function mm/rmap.c
--- a/mm/rmap.c~mm-change-direct-call-of-spin_lockanon_vma-lock-to-inline-function
+++ a/mm/rmap.c
@@ -134,7 +134,7 @@ int anon_vma_prepare(struct vm_area_stru
allocated = anon_vma;
}
- spin_lock(&anon_vma->lock);
+ anon_vma_lock(anon_vma);
/* page_table_lock to protect against threads */
spin_lock(&mm->page_table_lock);
if (likely(!vma->anon_vma)) {
@@ -147,7 +147,7 @@ int anon_vma_prepare(struct vm_area_stru
avc = NULL;
}
spin_unlock(&mm->page_table_lock);
- spin_unlock(&anon_vma->lock);
+ anon_vma_unlock(anon_vma);
if (unlikely(allocated))
anon_vma_free(allocated);
@@ -170,9 +170,9 @@ static void anon_vma_chain_link(struct v
avc->anon_vma = anon_vma;
list_add(&avc->same_vma, &vma->anon_vma_chain);
- spin_lock(&anon_vma->lock);
+ anon_vma_lock(anon_vma);
list_add_tail(&avc->same_anon_vma, &anon_vma->head);
- spin_unlock(&anon_vma->lock);
+ anon_vma_unlock(anon_vma);
}
/*
@@ -246,12 +246,12 @@ static void anon_vma_unlink(struct anon_
if (!anon_vma)
return;
- spin_lock(&anon_vma->lock);
+ anon_vma_lock(anon_vma);
list_del(&anon_vma_chain->same_anon_vma);
/* We must garbage collect the anon_vma if it's empty */
empty = list_empty(&anon_vma->head) && !anonvma_external_refcount(anon_vma);
- spin_unlock(&anon_vma->lock);
+ anon_vma_unlock(anon_vma);
if (empty)
anon_vma_free(anon_vma);
@@ -303,10 +303,10 @@ again:
goto out;
anon_vma = (struct anon_vma *) (anon_mapping - PAGE_MAPPING_ANON);
- spin_lock(&anon_vma->lock);
+ anon_vma_lock(anon_vma);
if (page_rmapping(page) != anon_vma) {
- spin_unlock(&anon_vma->lock);
+ anon_vma_unlock(anon_vma);
goto again;
}
@@ -318,7 +318,7 @@ out:
void page_unlock_anon_vma(struct anon_vma *anon_vma)
{
- spin_unlock(&anon_vma->lock);
+ anon_vma_unlock(anon_vma);
rcu_read_unlock();
}
@@ -1396,7 +1396,7 @@ static int rmap_walk_anon(struct page *p
anon_vma = page_anon_vma(page);
if (!anon_vma)
return ret;
- spin_lock(&anon_vma->lock);
+ anon_vma_lock(anon_vma);
list_for_each_entry(avc, &anon_vma->head, same_anon_vma) {
struct vm_area_struct *vma = avc->vma;
unsigned long address = vma_address(page, vma);
@@ -1406,7 +1406,7 @@ static int rmap_walk_anon(struct page *p
if (ret != SWAP_AGAIN)
break;
}
- spin_unlock(&anon_vma->lock);
+ anon_vma_unlock(anon_vma);
return ret;
}
_
Patches currently in -mm which might be from riel@xxxxxxxxxx are
mm-revalidate-anon_vma-in-page_lock_anon_vma.patch
mm-rename-anon_vma_lock-to-vma_lock_anon_vma.patch
mm-change-direct-call-of-spin_lockanon_vma-lock-to-inline-function.patch
mm-track-the-root-oldest-anon_vma.patch
mm-track-the-root-oldest-anon_vma-fix.patch
mm-always-lock-the-root-oldest-anon_vma.patch
mm-extend-ksm-refcounts-to-the-anon_vma-root.patch
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