ARM: findbit: add unwinder information

Add unwinder information so oops in the findbit functions can create a
proper backtrace.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

diff --git a/arch/arm/lib/findbit.S b/arch/arm/lib/findbit.S
index 6ec584d16d46415252b87fa5160ffa21c9375bfc..b7ac2d3c0748652c1094a2b648323f971c5042e0 100644 (file)
--- a/arch/arm/lib/findbit.S
+++ b/arch/arm/lib/findbit.S
@@ -12,6 +12,7 @@
  */
 #include <linux/linkage.h>
 #include <asm/assembler.h>
+#include <asm/unwind.h>
                 .text
 
 #ifdef __ARMEB__
@@ -22,6 +23,7 @@
 
                .macro  find_first, endian, set, name
 ENTRY(_find_first_\name\()bit_\endian)
+       UNWIND( .fnstart)
                teq     r1, #0
                beq     3f
                mov     r2, #0
@@ -41,11 +43,13 @@ ENTRY(_find_first_\name\()bit_\endian)
                blo     1b
 3:             mov     r0, r1                  @ no more bits
                ret     lr
+       UNWIND( .fnend)
 ENDPROC(_find_first_\name\()bit_\endian)
                .endm
 
                .macro  find_next, endian, set, name
 ENTRY(_find_next_\name\()bit_\endian)
+       UNWIND( .fnstart)
                cmp     r2, r1
                bhs     3b
                mov     ip, r2, lsr #5          @ word index
@@ -69,6 +73,7 @@ ENTRY(_find_next_\name\()bit_\endian)
                orr     r2, r2, #31             @ no zero bits
                add     r2, r2, #1              @ align bit pointer
                b       2b                      @ loop for next bit
+       UNWIND( .fnend)
 ENDPROC(_find_next_\name\()bit_\endian)
                .endm
 
@@ -97,6 +102,7 @@ ENDPROC(_find_next_\name\()bit_\endian)
  * One or more bits in the LSB of r3 are assumed to be set.
  */
 .L_found_swab:
+       UNWIND( .fnstart)
                rev_l   r3, ip
 .L_found:
 #if __LINUX_ARM_ARCH__ >= 7
@@ -130,4 +136,4 @@ ENDPROC(_find_next_\name\()bit_\endian)
                cmp     r1, r0                  @ Clamp to maxbit
                movlo   r0, r1
                ret     lr
-
+       UNWIND( .fnend)