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sh-use-common-threadinfo-allocator 

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

Deal with the xstate cleanup in the new arch_release_task_struct()
function.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Paul Mundt <lethal@linux-sh.org>
Link: http://lkml.kernel.org/r/20120505150142.189348931@linutronix.de
This commit is contained in:
Thomas Gleixner 2012-05-05 15:05:46 +00:00
parent c03a6a7ba6
commit df9a7b9b5d
2 changed files with 3 additions and 53 deletions
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10
arch/sh/include/asm/thread_info.h
View File

@ -88,21 +88,13 @@ static inline struct thread_info *current_thread_info(void)
return ti; return ti;
} }
/* thread information allocation */
#if THREAD_SHIFT >= PAGE_SHIFT
#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
#endif
extern struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node);
extern void free_thread_info(struct thread_info *ti);
extern void arch_task_cache_init(void); extern void arch_task_cache_init(void);
extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
extern void arch_release_task_struct(struct task_struct *tsk);
extern void init_thread_xstate(void); extern void init_thread_xstate(void);
#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
#endif /* __ASSEMBLY__ */ #endif /* __ASSEMBLY__ */
/* /*

46
arch/sh/kernel/process.c
View File

@ -29,53 +29,11 @@ void free_thread_xstate(struct task_struct *tsk)
} }
} }
#if THREAD_SHIFT < PAGE_SHIFT void arch_release_task_struct(struct task_struct *tsk)
static struct kmem_cache *thread_info_cache;
struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node)
{ {
struct thread_info *ti; free_thread_xstate(tsk);
#ifdef CONFIG_DEBUG_STACK_USAGE
gfp_t mask = GFP_KERNEL | __GFP_ZERO;
#else
gfp_t mask = GFP_KERNEL;
#endif
ti = kmem_cache_alloc_node(thread_info_cache, mask, node);
return ti;
} }
void free_thread_info(struct thread_info *ti)
{
free_thread_xstate(ti->task);
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, SLAB_PANIC, NULL);
}
#else
struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node)
{
#ifdef CONFIG_DEBUG_STACK_USAGE
gfp_t mask = GFP_KERNEL | __GFP_ZERO;
#else
gfp_t mask = GFP_KERNEL;
#endif
struct page *page = alloc_pages_node(node, mask, THREAD_SIZE_ORDER);
return page ? page_address(page) : NULL;
}
void free_thread_info(struct thread_info *ti)
{
free_thread_xstate(ti->task);
free_pages((unsigned long)ti, THREAD_SIZE_ORDER);
}
#endif /* THREAD_SHIFT < PAGE_SHIFT */
void arch_task_cache_init(void) void arch_task_cache_init(void)
{ {
if (!xstate_size) if (!xstate_size)