commit 16f9afe651e8197fb7ce6df0990d8e2ad779e1af
author Vineet Gupta <vgupta@synopsys.com> Mon May 27 21:43:41 2013 +0530
committer Vineet Gupta <vgupta@synopsys.com> Sat Jun 22 19:23:22 2013 +0530
tree c6482028a0ceced44e7e4819f7741c2fd8084e3e
parent 2fa919045b72ec892e17d56f888e6af4260b7629

ARC: pt_regs update #3: Remove unused gutter at start of callee_regs

This is trickier than prev two:

* context switching code saves kernel mode callee regs in the format of
  struct callee_regs thus needs adjustment. This also reduces the height
  of topmost kernel stack frame by 1 word.

* Since kernel stack unwinder is sensitive to height of topmost kernel
  stack frame, that needs a word of adjustment too.

ptrace needs a bit of updating since pt_regs now diverges from
user_regs_struct.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

arch/arc/kernel/process.c

diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c
index 949bfd5..db868db 100644
--- a/arch/arc/kernel/process.c
+++ b/arch/arc/kernel/process.c
@@ -55,10 +55,8 @@
  * |     ...        |
  * |    unused      |
  * |                |
- * ------------------  <==== top of Stack (thread.ksp)
- * |   UNUSED 1 word|
  * ------------------
- * |     r25        |
+ * |     r25        |   <==== top of Stack (thread.ksp)
  * ~                ~
  * |    --to--      |   (CALLEE Regs of user mode)
  * |     r13        |