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authorDavid Gibson <david@gibson.dropbear.id.au>2005-10-24 14:05:38 +1000
committerPaul Mackerras <paulus@samba.org>2005-10-27 20:51:13 +1000
commit328985b2c69d2592edd7f181a6b7360e51b08515 (patch)
tree62092de50dafd4b3db3513b45868c837915b8108 /include/asm-powerpc/thread_info.h
parent2765ca254060adb9a5abc2cfc6264b8daafc5742 (diff)
[PATCH] powerpc: Don't use kmalloc() for kernel stacks
In readiness for 64k pages, when THREAD_SIZE will be less than PAGE_SIZE, ppc64 uses kmalloc() rather than __get_free_pages() to allocate kernel stacks, and since thread_info.h was merged, so does ppc32. However that adds some overhead which we don't really want when PAGE_SIZE <= THREAD_SIZE (including all ppc32 machines), so this patch avoids it. Signed-off-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'include/asm-powerpc/thread_info.h')
-rw-r--r--include/asm-powerpc/thread_info.h27
1 files changed, 17 insertions, 10 deletions
diff --git a/include/asm-powerpc/thread_info.h b/include/asm-powerpc/thread_info.h
index 0b4c24551c21..ab17db79f69d 100644
--- a/include/asm-powerpc/thread_info.h
+++ b/include/asm-powerpc/thread_info.h
@@ -66,19 +66,26 @@ struct thread_info {
/* thread information allocation */
#ifdef CONFIG_DEBUG_STACK_USAGE
-#define alloc_thread_info(tsk) \
- ({ \
- struct thread_info *ret; \
- \
- ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \
- if (ret) \
- memset(ret, 0, THREAD_SIZE); \
- ret; \
- })
+#define THREAD_INFO_GFP GFP_KERNEL | __GFP_ZERO
#else
-#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
+#define THREAD_INFO_GFP GFP_KERNEL
#endif
+
+#if THREAD_SHIFT >= PAGE_SHIFT
+
+#define THREAD_ORDER (THREAD_SHIFT - PAGE_SHIFT)
+
+#define alloc_thread_info(tsk) \
+ ((struct thread_info *)__get_free_pages(THREAD_INFO_GFP, THREAD_ORDER))
+#define free_thread_info(ti) free_pages((unsigned long)ti, THREAD_ORDER)
+
+#else /* THREAD_SHIFT < PAGE_SHIFT */
+
+#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, THREAD_INFO_GFP)
#define free_thread_info(ti) kfree(ti)
+
+#endif /* THREAD_SHIFT < PAGE_SHIFT */
+
#define get_thread_info(ti) get_task_struct((ti)->task)
#define put_thread_info(ti) put_task_struct((ti)->task)