sh: Only reserve memory under CONFIG_ZERO_PAGE_OFFSET when it != 0.

Signed-off-by: Chris Smith <chris.smith@st.com>
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index 5342475085724c3a2de5959e5cda9ea3e9d6f623..370d2cfa34eba0c427da15cc3b35fb7e34078b97 100644 (file)
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -262,11 +262,11 @@ void __init setup_bootmem_allocator(unsigned long free_pfn)
                        BOOTMEM_DEFAULT);
 
        /*
-        * reserve physical page 0 - it's a special BIOS page on many boxes,
-        * enabling clean reboots, SMP operation, laptop functions.
+        * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
         */
-       reserve_bootmem(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET,
-                       BOOTMEM_DEFAULT);
+       if (CONFIG_ZERO_PAGE_OFFSET != 0)
+               reserve_bootmem(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET,
+                               BOOTMEM_DEFAULT);
 
        sparse_memory_present_with_active_regions(0);