[IA64] fix stack unwinder.

The stack unwinder can be called in interrupt context. On the other
hand xmalloc() can't be called in interrupt context.
Don't call xmalloc() if in the interrupt context.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>

diff --git a/xen/arch/ia64/linux-xen/unwind.c b/xen/arch/ia64/linux-xen/unwind.c
index ed72425ef3918358a2e4b810c07bf11efdf7b527..d88827fad02af222f5b2f40a7c76cbe066a03d31 100644 (file)
--- a/xen/arch/ia64/linux-xen/unwind.c
+++ b/xen/arch/ia64/linux-xen/unwind.c
@@ -91,9 +91,9 @@
 #endif
 
 #ifdef XEN
-#define alloc_reg_state()      xmalloc(struct unw_reg_state)
+#define alloc_reg_state()      ({in_irq()? NULL: xmalloc(struct unw_reg_state);})
 #define free_reg_state(usr)    xfree(usr)
-#define alloc_labeled_state()  xmalloc(struct unw_labeled_state)
+#define alloc_labeled_state()  ({in_irq()? NULL: xmalloc(struct unw_labeled_state);})
 #define free_labeled_state(usr)        xfree(usr)
 #else
 #define alloc_reg_state()      kmalloc(sizeof(struct unw_reg_state), GFP_ATOMIC)