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>

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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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arch/sh/Kconfig

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arch/sh/kernel/entry-common.S

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arch/sh/kernel/process.c

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arch/sh/kernel/signal.c

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