[PATCH] x86-64: Speed up dwarf2 unwinder

This changes the dwarf2 unwinder to do a binary search for CIEs
instead of a linear work. The linker is unfortunately not
able to build a proper lookup table at link time, instead it creates
one at runtime as soon as the bootmem allocator is usable (so you'll continue
using the linear lookup for the first [hopefully] few calls).
The code should be ready to utilize a build-time created table once
a fixed linker becomes available.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/init/main.c b/init/main.c
index ee123243fb53..36f608a7cfba 100644
--- a/init/main.c
+++ b/init/main.c
@@ -503,6 +503,7 @@ asmlinkage void __init start_kernel(void)
         printk(KERN_NOTICE);
         printk(linux_banner);
         setup_arch(&command_line);
+        unwind_setup();
         setup_per_cpu_areas();
         smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */