sh: unwinder: Convert frame allocations to GFP_ATOMIC.

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>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/sh/kernel/dwarf.c b/arch/sh/kernel/dwarf.c
index 83f3cc92549f..db021361b161 100644
--- a/arch/sh/kernel/dwarf.c
+++ b/arch/sh/kernel/dwarf.c
@@ -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;