sh: GUSA atomic rollback support.

This implements kernel-level atomic rollback built on top of gUSA,
as an alternative non-IRQ based atomicity method. This is generally
a faster method for platforms that are lacking the LL/SC pairs that
SH-4A and later use, and is only supportable on legacy cores.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 0 insertions, 18 deletions

diff --git a/arch/sh/kernel/signal_32.c b/arch/sh/kernel/signal_32.c
index ca754fd42437..f6b5fbfe75c4 100644
--- a/arch/sh/kernel/signal_32.c
+++ b/arch/sh/kernel/signal_32.c
@@ -507,24 +507,6 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
                                                 ctrl_inw(regs->pc - 4));
                                 break;
                 }
-#ifdef CONFIG_GUSA
-        } else {
-                /* gUSA handling */
-                preempt_disable();
-
-                if (regs->regs[15] >= 0xc0000000) {
-                        int offset = (int)regs->regs[15];
-
-                        /* Reset stack pointer: clear critical region mark */
-                        regs->regs[15] = regs->regs[1];
-                        if (regs->pc < regs->regs[0])
-                                /* Go to rewind point #1 */
-                                regs->pc = regs->regs[0] + offset -
-                                        instruction_size(ctrl_inw(regs->pc-4));
-                }
-
-                preempt_enable_no_resched();
-#endif
         }
 
         /* Set up the stack frame */