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sh: Conditionalize gUSA support.

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This conditionalizes gUSA support. gUSA is not supported on
SMP configurations, and it's not necessary there anyways due
to having other atomicity options (ie, movli.l/movco.l).

Anything implementing the LL/SC semantics (all SH-4A CPUs)
can switch to userspace atomicity implementations without
requiring gUSA. This is left default-enabled on all UP so
that glibc doesn't break.

Those that know what they are doing can disable this explicitly.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
2007-09-28 16:04:49 +09:00
parent 995bb781d4
commit 836624619b
4 changed files with 18 additions and 2 deletions
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2
arch/sh/kernel/process.c
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@ -350,7 +350,7 @@ struct task_struct *__switch_to(struct task_struct *prev,
unlazy_fpu(prev, task_pt_regs(prev));
#endif
#ifdef CONFIG_PREEMPT
#if defined(CONFIG_GUSA) && defined(CONFIG_PREEMPT)
{
struct pt_regs *regs;