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Commit 23df79da authored by Jan Willeke's avatar Jan Willeke Committed by Linus Torvalds
Browse files

s390/vmcore: implement remap_oldmem_pfn_range for s390 



Introduce the s390 specific way to map pages from oldmem.  The memory area
below OLDMEM_SIZE is mapped with offset OLDMEM_BASE.  The other old memory
is mapped directly.

Signed-off-by: default avatarJan Willeke <willeke@de.ibm.com>
Signed-off-by: default avatarMichael Holzheu <holzheu@linux.vnet.ibm.com>
Cc: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9cb21813

arch/s390/kernel/crash_dump.c

+26 −0
Original line number Diff line number Diff line
@@ -98,6 +98,32 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf, 
	return (rc == 0) ? csize : rc;

}



/*

 * Remap "oldmem"

 *

 * For the kdump reserved memory this functions performs a swap operation:

 * [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE]

 */

int remap_oldmem_pfn_range(struct vm_area_struct *vma, unsigned long from,

			   unsigned long pfn, unsigned long size, pgprot_t prot)

{

	unsigned long size_old;

	int rc;



	if (pfn < OLDMEM_SIZE >> PAGE_SHIFT) {

		size_old = min(size, OLDMEM_SIZE - (pfn << PAGE_SHIFT));

		rc = remap_pfn_range(vma, from,

				     pfn + (OLDMEM_BASE >> PAGE_SHIFT),

				     size_old, prot);

		if (rc || size == size_old)

			return rc;

		size -= size_old;

		from += size_old;

		pfn += size_old >> PAGE_SHIFT;

	}

	return remap_pfn_range(vma, from, pfn, size, prot);

}



/*

 * Copy memory from old kernel

 */