sh: Add a printk() to warn legacy mem= growers.

mem= can't be used to grow the size of kernel memory, so provide a
warning to that effect.

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

1 files changed, 11 insertions, 0 deletions

diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index 6891cc93548e..7eb7fdcce0f8 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -84,6 +84,17 @@ static int __init early_parse_mem(char *p)
 
         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
         size = memparse(p, &p);
+
+        if (size > __MEMORY_SIZE) {
+                static char msg[] __initdata = KERN_ERR
+                        "Using mem= to increase the size of kernel memory "
+                        "is not allowed.\n"
+                        "  Recompile the kernel with the correct value for "
+                        "CONFIG_MEMORY_SIZE.\n";
+                printk(msg);
+                return 0;
+        }
+
         memory_end = memory_start + size;
 
         return 0;