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llist: Make some llist functions inline

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Because llist code will be used in performance critical scheduler
code path, make llist_add() and llist_del_all() inline to avoid
function calling overhead and related 'glue' overhead.

Signed-off-by: Huang Ying <[email protected]>
Acked-by: Mathieu Desnoyers <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Huang Ying 2011-09-08 14:00:42 +08:00 • committed by Ingo Molnar
commit 1230db8e15
5 changed files with 59 additions and 53 deletions
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3
lib/Kconfig
View file

@ -276,7 +276,4 @@ config CORDIC
so its calculations are in fixed point. Modules can select this
when they require this function. Module will be called cordic.
config LLIST
bool
endmenu

4
lib/Makefile
View file

@ -22,7 +22,7 @@ lib-y += kobject.o kref.o klist.o
obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \
string_helpers.o gcd.o lcm.o list_sort.o uuid.o flex_array.o \
bsearch.o find_last_bit.o find_next_bit.o
bsearch.o find_last_bit.o find_next_bit.o llist.o
obj-y += kstrtox.o
obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o
@ -115,8 +115,6 @@ obj-$(CONFIG_CPU_RMAP) += cpu_rmap.o
obj-$(CONFIG_CORDIC) += cordic.o
obj-$(CONFIG_LLIST) += llist.o
hostprogs-y := gen_crc32table
clean-files := crc32table.h

40
lib/llist.c
View file

@ -29,28 +29,6 @@
#include <asm/system.h>
/**
* llist_add - add a new entry
* @new: new entry to be added
* @head: the head for your lock-less list
*/
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;
new->next = entry;
cpu_relax();
} while ((entry = cmpxchg(&head->first, old_entry, new)) != old_entry);
}
EXPORT_SYMBOL_GPL(llist_add);
/**
* llist_add_batch - add several linked entries in batch
* @new_first: first entry in batch to be added
@ -109,21 +87,3 @@ struct llist_node *llist_del_first(struct llist_head *head)
return entry;
}
EXPORT_SYMBOL_GPL(llist_del_first);
/**
* llist_del_all - delete all entries from lock-less list
* @head: the head of lock-less list to delete all entries
*
* If list is empty, return NULL, otherwise, delete all entries and
* return the pointer to the first entry. The order of entries
* deleted is from the newest to the oldest added one.
*/
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);
}
EXPORT_SYMBOL_GPL(llist_del_all);