[PATCH] i386: Reserve kernel memory starting from _text

Currently when we are reserving the memory the kernel text
resides in we start at __PHYSICAL_START which happens to be
correct but not very obvious.  In addition when we start relocating
the kernel __PHYSICAL_START is the wrong value, as it is an
absolute symbol that does not get relocated.

By starting the reservation at __pa_symbol(_text)
the code is clearer and will be correct when relocated.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>

diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index 141041d..61539af 100644 (file)
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -1118,8 +1118,8 @@ void __init setup_bootmem_allocator(void)
         * the (very unlikely) case of us accidentally initializing the
         * bootmem allocator with an invalid RAM area.
         */
-       reserve_bootmem(__PHYSICAL_START, (PFN_PHYS(min_low_pfn) +
-                        bootmap_size + PAGE_SIZE-1) - (__PHYSICAL_START));
+       reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
+                        bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text));
 
        /*
         * reserve physical page 0 - it's a special BIOS page on many boxes,