Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=38c425f69c8d949620384f917e00652eaf390ec9
Commit: 38c425f69c8d949620384f917e00652eaf390ec9
Parent: 0facbe3a34556bbc30333971e32c5430b087fcb1
Author: Paul Mundt <[EMAIL PROTECTED]>
AuthorDate: Fri May 11 11:26:10 2007 +0900
Committer: Paul Mundt <[EMAIL PROTECTED]>
CommitDate: Mon May 14 09:18:34 2007 +0900
sh: Kill off pmb slab cache destructor.
This is the last remaining slab destructor in the kernel, which
we kill off and move the resultant list tracking logic up to
the pmb_alloc()/pmb_free() paths.
As Christoph Lameter pointed out, it's potentially unsafe to be
taking the list lock in the destructor anyways, so this is also
more fundamentally correct.
With this in place, we're all set for killing off slab destructors
from the kernel entirely.
Signed-off-by: Paul Mundt <[EMAIL PROTECTED]>
---
arch/sh/mm/pmb.c | 79 ++++++++++++++++++++++++++----------------------------
1 files changed, 38 insertions(+), 41 deletions(-)
diff --git a/arch/sh/mm/pmb.c b/arch/sh/mm/pmb.c
index 02aae06..b6a5a33 100644
--- a/arch/sh/mm/pmb.c
+++ b/arch/sh/mm/pmb.c
@@ -3,7 +3,7 @@
*
* Privileged Space Mapping Buffer (PMB) Support.
*
- * Copyright (C) 2005, 2006 Paul Mundt
+ * Copyright (C) 2005, 2006, 2007 Paul Mundt
*
* P1/P2 Section mapping definitions from map32.h, which was:
*
@@ -68,6 +68,32 @@ static inline unsigned long mk_pmb_data(unsigned int entry)
return mk_pmb_entry(entry) | PMB_DATA;
}
+static DEFINE_SPINLOCK(pmb_list_lock);
+static struct pmb_entry *pmb_list;
+
+static inline void pmb_list_add(struct pmb_entry *pmbe)
+{
+ struct pmb_entry **p, *tmp;
+
+ p = &pmb_list;
+ while ((tmp = *p) != NULL)
+ p = &tmp->next;
+
+ pmbe->next = tmp;
+ *p = pmbe;
+}
+
+static inline void pmb_list_del(struct pmb_entry *pmbe)
+{
+ struct pmb_entry **p, *tmp;
+
+ for (p = &pmb_list; (tmp = *p); p = &tmp->next)
+ if (tmp == pmbe) {
+ *p = tmp->next;
+ return;
+ }
+}
+
struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
unsigned long flags)
{
@@ -81,11 +107,19 @@ struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned
long ppn,
pmbe->ppn = ppn;
pmbe->flags = flags;
+ spin_lock_irq(&pmb_list_lock);
+ pmb_list_add(pmbe);
+ spin_unlock_irq(&pmb_list_lock);
+
return pmbe;
}
void pmb_free(struct pmb_entry *pmbe)
{
+ spin_lock_irq(&pmb_list_lock);
+ pmb_list_del(pmbe);
+ spin_unlock_irq(&pmb_list_lock);
+
kmem_cache_free(pmb_cache, pmbe);
}
@@ -167,31 +201,6 @@ void clear_pmb_entry(struct pmb_entry *pmbe)
clear_bit(entry, &pmb_map);
}
-static DEFINE_SPINLOCK(pmb_list_lock);
-static struct pmb_entry *pmb_list;
-
-static inline void pmb_list_add(struct pmb_entry *pmbe)
-{
- struct pmb_entry **p, *tmp;
-
- p = &pmb_list;
- while ((tmp = *p) != NULL)
- p = &tmp->next;
-
- pmbe->next = tmp;
- *p = pmbe;
-}
-
-static inline void pmb_list_del(struct pmb_entry *pmbe)
-{
- struct pmb_entry **p, *tmp;
-
- for (p = &pmb_list; (tmp = *p); p = &tmp->next)
- if (tmp == pmbe) {
- *p = tmp->next;
- return;
- }
-}
static struct {
unsigned long size;
@@ -283,25 +292,14 @@ void pmb_unmap(unsigned long addr)
} while (pmbe);
}
-static void pmb_cache_ctor(void *pmb, struct kmem_cache *cachep, unsigned long
flags)
+static void pmb_cache_ctor(void *pmb, struct kmem_cache *cachep,
+ unsigned long flags)
{
struct pmb_entry *pmbe = pmb;
memset(pmb, 0, sizeof(struct pmb_entry));
- spin_lock_irq(&pmb_list_lock);
-
pmbe->entry = PMB_NO_ENTRY;
- pmb_list_add(pmbe);
-
- spin_unlock_irq(&pmb_list_lock);
-}
-
-static void pmb_cache_dtor(void *pmb, struct kmem_cache *cachep, unsigned long
flags)
-{
- spin_lock_irq(&pmb_list_lock);
- pmb_list_del(pmb);
- spin_unlock_irq(&pmb_list_lock);
}
static int __init pmb_init(void)
@@ -312,8 +310,7 @@ static int __init pmb_init(void)
BUG_ON(unlikely(nr_entries >= NR_PMB_ENTRIES));
pmb_cache = kmem_cache_create("pmb", sizeof(struct pmb_entry), 0,
- SLAB_PANIC, pmb_cache_ctor,
- pmb_cache_dtor);
+ SLAB_PANIC, pmb_cache_ctor, NULL);
jump_to_P2();
-
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