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| author | Stuart Menefy <stuart.menefy@st.com> | 2007-11-30 16:12:36 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2008-01-28 13:18:58 +0900 |
| commit | 1efe4ce3ca126da77e450d5a83f7201949d76f62 (patch) | |
| tree | fbae9902aa4103a9e86d06f841d580f24682e7b3 /arch/sh/kernel/process_32.c | |
| parent | 53ff09422e5e7a6d6198b767c8f494e43ec8e3ae (diff) | |
| download | op-kernel-dev-1efe4ce3ca126da77e450d5a83f7201949d76f62.zip op-kernel-dev-1efe4ce3ca126da77e450d5a83f7201949d76f62.tar.gz | |
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>
Diffstat (limited to 'arch/sh/kernel/process_32.c')
| -rw-r--r-- | arch/sh/kernel/process_32.c | 19 |
1 files changed, 0 insertions, 19 deletions
diff --git a/arch/sh/kernel/process_32.c b/arch/sh/kernel/process_32.c index b483248..9ab1926 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 |
