sh: unwinder: Convert frame allocations to GFP_ATOMIC.
Paul Mundt [Fri, 14 Aug 2009 14:58:37 +0000 (23:58 +0900)]
save_stack_trace_tsk() and friends can be called from atomic context (as
triggered by latencytop), and subsequently hit two problematic allocation
points that were using GFP_KERNEL (these were dwarf_unwind_stack() and
dwarf_frame_alloc_regs()). Convert these over to GFP_ATOMIC and get
latencytop working with the DWARF unwinder.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/dwarf.c

index 83f3cc9..db02136 100644 (file)
@@ -57,7 +57,7 @@ static void dwarf_frame_alloc_regs(struct dwarf_frame *frame,
        if (frame->num_regs >= num_regs)
                return;
 
-       regs = kzalloc(new_size, GFP_KERNEL);
+       regs = kzalloc(new_size, GFP_ATOMIC);
        if (!regs) {
                printk(KERN_WARNING "Unable to allocate DWARF registers\n");
                /*
@@ -531,7 +531,7 @@ struct dwarf_frame *dwarf_unwind_stack(unsigned long pc,
                define_ra = true;
        }
 
-       frame = kzalloc(sizeof(*frame), GFP_KERNEL);
+       frame = kzalloc(sizeof(*frame), GFP_ATOMIC);
        if (!frame)
                return NULL;