mm: do not walk all of system memory during show_mem

[platform/adaptation/renesas_rcar/renesas_kernel.git] / arch / Kconfig

diff --git a/arch/Kconfig b/arch/Kconfig
index ad95133..ded747c 100644 (file)
--- 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