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authorDavid Howells <dhowells@redhat.com>2010-10-27 17:29:01 +0100
committerDavid Howells <dhowells@redhat.com>2010-10-27 17:29:01 +0100
commit7c7fcf762e405eb040ee10d22d656a791f616122 (patch)
tree2ec4f320fe2d348ffbdab6aebc9a36bcbf13da34 /arch/mn10300/include/asm/thread_info.h
parenta5e03ca2fd57a5823b759981bff8d19b46ddad4d (diff)
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MN10300: Save frame pointer in thread_info struct rather than global var
Save the current exception frame pointer in the thread_info struct rather than in a global variable as the latter makes SMP tricky, especially when preemption is also enabled. This also replaces __frame with current_frame() and rearranges header file inclusions to make it all compile. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
Diffstat (limited to 'arch/mn10300/include/asm/thread_info.h')
-rw-r--r--arch/mn10300/include/asm/thread_info.h18
1 files changed, 14 insertions, 4 deletions
diff --git a/arch/mn10300/include/asm/thread_info.h b/arch/mn10300/include/asm/thread_info.h
index 2001cb657a95..aa07a4a5d794 100644
--- a/arch/mn10300/include/asm/thread_info.h
+++ b/arch/mn10300/include/asm/thread_info.h
@@ -16,10 +16,6 @@
#include <asm/page.h>
-#ifndef __ASSEMBLY__
-#include <asm/processor.h>
-#endif
-
#define PREEMPT_ACTIVE 0x10000000
#ifdef CONFIG_4KSTACKS
@@ -38,10 +34,14 @@
* must also be changed
*/
#ifndef __ASSEMBLY__
+typedef struct {
+ unsigned long seg;
+} mm_segment_t;
struct thread_info {
struct task_struct *task; /* main task structure */
struct exec_domain *exec_domain; /* execution domain */
+ struct pt_regs *frame; /* current exception frame */
unsigned long flags; /* low level flags */
__u32 cpu; /* current CPU */
__s32 preempt_count; /* 0 => preemptable, <0 => BUG */
@@ -55,6 +55,10 @@ struct thread_info {
__u8 supervisor_stack[0];
};
+#define thread_info_to_uregs(ti) \
+ ((struct pt_regs *) \
+ ((unsigned long)ti + THREAD_SIZE - sizeof(struct pt_regs)))
+
#else /* !__ASSEMBLY__ */
#ifndef __ASM_OFFSETS_H__
@@ -102,6 +106,12 @@ struct thread_info *current_thread_info(void)
return ti;
}
+static inline __attribute__((const))
+struct pt_regs *current_frame(void)
+{
+ return current_thread_info()->frame;
+}
+
/* how to get the current stack pointer from C */
static inline unsigned long current_stack_pointer(void)
{
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