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powerpc: Use common threadinfo allocator

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The core now has a threadinfo allocator which uses a kmemcache when
THREAD_SIZE < PAGE_SIZE.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Link: http://lkml.kernel.org/r/20120505150142.059161130@linutronix.de
This commit is contained in:
Thomas Gleixner 2012-05-05 15:05:45 +00:00
parent 3194f61de9
commit 96c9511797
2 changed files with 0 additions and 44 deletions
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13
arch/powerpc/include/asm/thread_info.h
View File

@ -62,21 +62,8 @@ struct thread_info {
#define init_thread_info (init_thread_union.thread_info)
#define init_stack (init_thread_union.stack)
/* thread information allocation */
#if THREAD_SHIFT >= PAGE_SHIFT
#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
#else /* THREAD_SHIFT < PAGE_SHIFT */
#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
extern struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node);
extern void free_thread_info(struct thread_info *ti);
#endif /* THREAD_SHIFT < PAGE_SHIFT */
/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{

31
arch/powerpc/kernel/process.c
View File

@ -1252,37 +1252,6 @@ void __ppc64_runlatch_off(void)
}
#endif /* CONFIG_PPC64 */
#if THREAD_SHIFT < PAGE_SHIFT
static struct kmem_cache *thread_info_cache;
struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node)
{
struct thread_info *ti;
ti = kmem_cache_alloc_node(thread_info_cache, GFP_KERNEL, node);
if (unlikely(ti == NULL))
return NULL;
#ifdef CONFIG_DEBUG_STACK_USAGE
memset(ti, 0, THREAD_SIZE);
#endif
return ti;
}
void free_thread_info(struct thread_info *ti)
{
kmem_cache_free(thread_info_cache, ti);
}
void thread_info_cache_init(void)
{
thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
THREAD_SIZE, 0, NULL);
BUG_ON(thread_info_cache == NULL);
}
#endif /* THREAD_SHIFT < PAGE_SHIFT */
unsigned long arch_align_stack(unsigned long sp)
{
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)