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Commit c40dd2f7 authored by Anton Blanchard's avatar Anton Blanchard Committed by Benjamin Herrenschmidt
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powerpc: Add System RAM to /proc/iomem 



We've resisted adding System RAM to /proc/iomem because it is
the wrong place for it. Unfortunately we continue to find tools
that rely on this behaviour so give up and add it in.

Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 88cf11b4

arch/powerpc/mm/mem.c

+30 −0
Original line number Original line Diff line number Diff line
@@ -34,6 +34,7 @@ 
#include <linux/suspend.h>

#include <linux/suspend.h>

#include <linux/memblock.h>

#include <linux/memblock.h>

#include <linux/hugetlb.h>

#include <linux/hugetlb.h>

#include <linux/slab.h>





#include <asm/pgalloc.h>

#include <asm/pgalloc.h>

#include <asm/prom.h>

#include <asm/prom.h>
@@ -555,3 +556,32 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, 
		book3e_hugetlb_preload(vma->vm_mm, address, *ptep);

		book3e_hugetlb_preload(vma->vm_mm, address, *ptep);

#endif

#endif

}

}



/*

 * System memory should not be in /proc/iomem but various tools expect it

 * (eg kdump).

 */

static int add_system_ram_resources(void)

{

	struct memblock_region *reg;



	for_each_memblock(memory, reg) {

		struct resource *res;

		unsigned long base = reg->base;

		unsigned long size = reg->size;



		res = kzalloc(sizeof(struct resource), GFP_KERNEL);

		WARN_ON(!res);



		if (res) {

			res->name = "System RAM";

			res->start = base;

			res->end = base + size - 1;

			res->flags = IORESOURCE_MEM;

			WARN_ON(request_resource(&iomem_resource, res) < 0);

		}

	}



	return 0;

}

subsys_initcall(add_system_ram_resources);