From 836624619b98535079053920a29a7e474ac17cbc Mon Sep 17 00:00:00 2001 From: Paul Mundt Date: Fri, 28 Sep 2007 16:04:49 +0900 Subject: sh: Conditionalize gUSA support. 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 --- arch/sh/Kconfig | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'arch/sh/Kconfig') diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig index a8693edd4f4..44982c1dfa2 100644 --- a/arch/sh/Kconfig +++ b/arch/sh/Kconfig @@ -570,6 +570,20 @@ config NR_CPUS source "kernel/Kconfig.preempt" +config GUSA + def_bool y + depends on !SMP + help + This enables support for gUSA (general UserSpace Atomicity). + This is the default implementation for both UP and non-ll/sc + CPUs, and is used by the libc, amongst others. + + For additional information, design information can be found + in . + + This should only be disabled for special cases where alternate + atomicity implementations exist. + endmenu menu "Boot options" -- cgit v1.2.3