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>
diff --git a/arch/sh/kernel/dwarf.c b/arch/sh/kernel/dwarf.c
index 83f3cc9..db02136 100644
--- a/arch/sh/kernel/dwarf.c
+++ b/arch/sh/kernel/dwarf.c
@@ -57,7 +57,7 @@
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 @@
define_ra = true;
}
- frame = kzalloc(sizeof(*frame), GFP_KERNEL);
+ frame = kzalloc(sizeof(*frame), GFP_ATOMIC);
if (!frame)
return NULL;