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s390/kdump: Disable mmap for s390

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The kdump mmap patch series (git commit 83086978c6) directly
map the PT_LOADs to memory. On s390 this does not work because the
copy_from_oldmem() function swaps [0,crashkernel size] with
[crashkernel base, crashkernel base+crashkernel size]. The swap
int copy_from_oldmem() was done in order correctly implement /dev/oldmem.

See: http://marc.info/?l=kexec&m=136940802511603&w=2

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Holzheu 2013-07-18 12:17:57 +02:00 • committed by Martin Schwidefsky
parent c9a7afa380
commit 5a74953ff5
1 changed files with 1 additions and 1 deletions
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fs/proc/vmcore.c
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@ -223,7 +223,7 @@ static inline char *alloc_elfnotes_buf(size_t notes_sz)
* regions in the 1st kernel pointed to by PT_LOAD entries) into * regions in the 1st kernel pointed to by PT_LOAD entries) into
* virtually contiguous user-space in ELF layout. * virtually contiguous user-space in ELF layout.
*/ */
#ifdef CONFIG_MMU #if defined(CONFIG_MMU) && !defined(CONFIG_S390)
static int mmap_vmcore(struct file *file, struct vm_area_struct *vma) static int mmap_vmcore(struct file *file, struct vm_area_struct *vma)
{ {
size_t size = vma->vm_end - vma->vm_start; size_t size = vma->vm_end - vma->vm_start;