From 1efe4ce3ca126da77e450d5a83f7201949d76f62 Mon Sep 17 00:00:00 2001 From: Stuart Menefy Date: Fri, 30 Nov 2007 16:12:36 +0900 Subject: 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 Signed-off-by: Paul Mundt --- arch/sh/kernel/process_32.c | 19 ------------------- 1 file changed, 19 deletions(-) (limited to 'arch/sh/kernel/process_32.c') diff --git a/arch/sh/kernel/process_32.c b/arch/sh/kernel/process_32.c index b48324867eee..9ab1926b9d10 100644 --- a/arch/sh/kernel/process_32.c +++ b/arch/sh/kernel/process_32.c @@ -322,25 +322,6 @@ struct task_struct *__switch_to(struct task_struct *prev, unlazy_fpu(prev, task_pt_regs(prev)); #endif -#if defined(CONFIG_GUSA) && defined(CONFIG_PREEMPT) - { - struct pt_regs *regs; - - preempt_disable(); - regs = task_pt_regs(prev); - if (user_mode(regs) && 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 */ - regs->pc = regs->regs[0] + offset; - } - preempt_enable_no_resched(); - } -#endif - #ifdef CONFIG_MMU /* * Restore the kernel mode register -- cgit v1.2.3