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llist: Remove the platform-dependent NMI checks 

Remove the nmi() checks spread around the code. in_nmi() is not available
on every architecture and it's a pretty obscure and ugly check in any case.

Cc: Huang Ying <ying.huang@intel.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1315461646-1379-3-git-send-email-ying.huang@intel.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2011-10-04 12:43:11 +02:00
parent 1230db8e15
commit 2c30245c65
2 changed files with 4 additions and 20 deletions
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12
include/linux/llist.h
View File

@ -35,8 +35,8 @@
*
* The basic atomic operation of this list is cmpxchg on long. On
* architectures that don't have NMI-safe cmpxchg implementation, the
* list can NOT be used in NMI handler. So code uses the list in NMI
* handler should depend on CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG.
* list can NOT be used in NMI handlers. So code that uses the list in
* an NMI handler should depend on CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG.
*
* Copyright 2010,2011 Intel Corp.
* Author: Huang Ying <ying.huang@intel.com>
@ -147,10 +147,6 @@ static inline void llist_add(struct llist_node *new, struct llist_head *head)
{
struct llist_node *entry, *old_entry;
#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
BUG_ON(in_nmi());
#endif
entry = head->first;
do {
old_entry = entry;
@ -169,10 +165,6 @@ static inline void llist_add(struct llist_node *new, struct llist_head *head)
*/
static inline struct llist_node *llist_del_all(struct llist_head *head)
{
#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
BUG_ON(in_nmi());
#endif
return xchg(&head->first, NULL);
}
#endif /* LLIST_H */

12
lib/llist.c
View File

@ -3,8 +3,8 @@
*
* The basic atomic operation of this list is cmpxchg on long. On
* architectures that don't have NMI-safe cmpxchg implementation, the
* list can NOT be used in NMI handler. So code uses the list in NMI
* handler should depend on CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG.
* list can NOT be used in NMI handlers. So code that uses the list in
* an NMI handler should depend on CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG.
*
* Copyright 2010,2011 Intel Corp.
* Author: Huang Ying <ying.huang@intel.com>
@ -40,10 +40,6 @@ void llist_add_batch(struct llist_node *new_first, struct llist_node *new_last,
{
struct llist_node *entry, *old_entry;
#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
BUG_ON(in_nmi());
#endif
entry = head->first;
do {
old_entry = entry;
@ -71,10 +67,6 @@ struct llist_node *llist_del_first(struct llist_head *head)
{
struct llist_node *entry, *old_entry, *next;
#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
BUG_ON(in_nmi());
#endif
entry = head->first;
do {
if (entry == NULL)