Re: [RFC] Initial attempt to make ARM use LMB

[Rabin Vincent]

On Thu, Mar 25, 2010 at 11:32:48PM +0000, Russell King - ARM Linux wrote:
> The patch below is the combined patch; individual patches can be found
> in the arm:lmb patches on the website or the lmb branch of my git tree;
> this should be considered unstable.

Something like the following is needed to make initrds work after this
patch:

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 8b2853a..8c12214 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -11,6 +11,7 @@
 #include <linux/errno.h>
 #include <linux/swap.h>
 #include <linux/init.h>
+#include <linux/initrd.h>
 #include <linux/bootmem.h>
 #include <linux/mman.h>
 #include <linux/nodemask.h>
@@ -32,9 +33,6 @@
 
 #include "mm.h"
 
-static unsigned long phys_initrd_start __initdata = 0;
-static unsigned long phys_initrd_size __initdata = 0;
-
 static int __init early_initrd(char *p)
 {
        unsigned long start, size;
@@ -44,8 +42,8 @@ static int __init early_initrd(char *p)
        if (*endp == ',') {
                size = memparse(endp + 1, NULL);
 
-               phys_initrd_start = start;
-               phys_initrd_size = size;
+               initrd_start = __phys_to_virt(start);
+               initrd_end = initrd_start + size;
        }
        return 0;
 }
@@ -55,8 +53,8 @@ static int __init parse_tag_initrd(const struct tag *tag)
 {
        printk(KERN_WARNING "ATAG_INITRD is deprecated; "
                "please update your bootloader.\n");
-       phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
-       phys_initrd_size = tag->u.initrd.size;
+       initrd_start = tag->u.initrd.start;
+       initrd_end = initrd_start + tag->u.initrd.size;
        return 0;
 }
 
@@ -64,8 +62,8 @@ __tagtable(ATAG_INITRD, parse_tag_initrd);
 
 static int __init parse_tag_initrd2(const struct tag *tag)
 {
-       phys_initrd_start = tag->u.initrd.start;
-       phys_initrd_size = tag->u.initrd.size;
+       initrd_start = __phys_to_virt(tag->u.initrd.start);
+       initrd_end = initrd_start + tag->u.initrd.size;
        return 0;
 }
 
@@ -284,7 +282,7 @@ void __init arm_lmb_reserve(void)
 #else
        lmb_reserve(__pa(_stext), _end - _stext);
 #endif
-       lmb_reserve(phys_initrd_start, phys_initrd_size);
+       lmb_reserve(__pa(initrd_start), initrd_end - initrd_start);
        arm_mm_lmb_reserve();
 }
 
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