X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=arch%2FKconfig;h=ded747c7b74c32e66fa681d7e710528c23421f9e;hb=da6537850eb0d54eed44ba686be0f5f83c5c6559;hp=af2cc6eabcc781c4e8f7ee2067de75844ed5874d;hpb=b24a63d5efaf0c5667cd8d488ab4e1d8e5d3eaec;p=~andy%2Flinux

diff --git a/arch/Kconfig b/arch/Kconfig
index af2cc6eabcc..ded747c7b74 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -353,6 +353,18 @@ config HAVE_CONTEXT_TRACKING
 config HAVE_VIRT_CPU_ACCOUNTING
 	bool
 
+config HAVE_VIRT_CPU_ACCOUNTING_GEN
+	bool
+	default y if 64BIT
+	help
+	  With VIRT_CPU_ACCOUNTING_GEN, cputime_t becomes 64-bit.
+	  Before enabling this option, arch code must be audited
+	  to ensure there are no races in concurrent read/write of
+	  cputime_t. For example, reading/writing 64-bit cputime_t on
+	  some 32-bit arches may require multiple accesses, so proper
+	  locking is needed to protect against concurrent accesses.
+
+
 config HAVE_IRQ_TIME_ACCOUNTING
 	bool
 	help
@@ -390,6 +402,16 @@ config HAVE_UNDERSCORE_SYMBOL_PREFIX
 	  Some architectures generate an _ in front of C symbols; things like
 	  module loading and assembly files need to know about this.
 
+config HAVE_IRQ_EXIT_ON_IRQ_STACK
+	bool
+	help
+	  Architecture doesn't only execute the irq handler on the irq stack
+	  but also irq_exit(). This way we can process softirqs on this irq
+	  stack instead of switching to a new one when we call __do_softirq()
+	  in the end of an hardirq.
+	  This spares a stack switch and improves cache usage on softirq
+	  processing.
+
 #
 # ABI hall of shame
 #