ARM: add help text for HIGHPTE configuration entry

Add some help text for the HIGHPTE configuration entry.  This comes from
the x86 entry, but reworded to be more a more accurate description of
what this option does.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 45df48ba0b128dd408e2275687b1757c87e0ca74..cc0ea0c6cfc9b8f0144a1fe661d487bde0001920 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1661,6 +1661,12 @@ config HIGHMEM
 config HIGHPTE
        bool "Allocate 2nd-level pagetables from highmem"
        depends on HIGHMEM
+       help
+         The VM uses one page of physical memory for each page table.
+         For systems with a lot of processes, this can use a lot of
+         precious low memory, eventually leading to low memory being
+         consumed by page tables.  Setting this option will allow
+         user-space 2nd level page tables to reside in high memory.
 
 config HW_PERF_EVENTS
        bool "Enable hardware performance counter support for perf events"