[PATCH] ARM: 2760/1: Add a warning on dynamic tick timekeeping on some platforms

Patch from Tony Lindgren

This patch was suggested by RMK, and adds a warning on the accuracy
of timekeeping when using dynamic tick on some platforms. Depending
on the timer implementation, dynamic tick may affect the accuracy of
timekeeping.
Currently at least OMAP is known to have accurate timekeeping with
dynamic tick.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index c8d94dcd8ef7daed544f14d5ac2db98c0236c952..620f2ca94ed27390640abe911f0ab4a4bca20a1e 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -361,6 +361,11 @@ config NO_IDLE_HZ
          Alternatively, if you want dynamic tick automatically enabled
          during boot, pass "dyntick=enable" via the kernel command string.
 
+         Please note that dynamic tick may affect the accuracy of
+         timekeeping on some platforms depending on the implementation.
+         Currently at least OMAP platform is known to have accurate
+         timekeeping with dynamic tick.
+
 config ARCH_DISCONTIGMEM_ENABLE
        bool
        default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)