linux-kernel - [tip:smp/hotplug] sh-use-common-threadinfo-allocator

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Message-ID: <tip-df9a7b9b5d1a5ef8cd3474d0cea2c6428542e288@git.kernel.org>
Date:	Tue, 8 May 2012 05:43:43 -0700
From:	tip-bot for Thomas Gleixner <tglx@...utronix.de>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	lethal@...ux-sh.org, tglx@...utronix.de
Subject: [tip:smp/hotplug] sh-use-common-threadinfo-allocator

Commit-ID:  df9a7b9b5d1a5ef8cd3474d0cea2c6428542e288
Gitweb:     http://git.kernel.org/tip/df9a7b9b5d1a5ef8cd3474d0cea2c6428542e288
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Sat, 5 May 2012 15:05:46 +0000
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 8 May 2012 14:08:45 +0200

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@...utronix.de>
Cc: Paul Mundt <lethal@...ux-sh.org>
Link: http://lkml.kernel.org/r/20120505150142.189348931@linutronix.de
---
 arch/sh/include/asm/thread_info.h |   10 +-------
 arch/sh/kernel/process.c          |   46 +-----------------------------------
 2 files changed, 3 insertions(+), 53 deletions(-)

diff --git a/arch/sh/include/asm/thread_info.h b/arch/sh/include/asm/thread_info.h
index 09963d4..b690206 100644
--- a/arch/sh/include/asm/thread_info.h
+++ b/arch/sh/include/asm/thread_info.h
@@ -88,21 +88,13 @@ static inline struct thread_info *current_thread_info(void)
 	return ti;
 }
 
-/* thread information allocation */
-#if 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 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);
 
-#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
-
 #endif /* __ASSEMBLY__ */
 
 /*
diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c
index 325f98b..f2621ab 100644
--- a/arch/sh/kernel/process.c
+++ b/arch/sh/kernel/process.c
@@ -29,52 +29,10 @@ void free_thread_xstate(struct task_struct *tsk)
 	}
 }
 
-#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;
-#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)
+void arch_release_task_struct(struct task_struct *tsk)
 {
-	free_thread_xstate(ti->task);
-	free_pages((unsigned long)ti, THREAD_SIZE_ORDER);
+	free_thread_xstate(tsk);
 }
-#endif /* THREAD_SHIFT < PAGE_SHIFT */
 
 void arch_task_cache_init(void)
 {
--
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