On 3/27/20 9:56 AM, Christian Borntraeger wrote:
> If a signal is pending we might return -ENOMEM instead of -EINTR.
> We should propagate the proper error during KSM unsharing.
>
> Fixes: 3ac8e38015d4 ("s390/mm: disable KSM for storage key enabled pages")
> Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Reviewed-by: Janosch Frank <frankja@xxxxxxxxxxxxxxxxxx>
> ---
> arch/s390/mm/gmap.c | 11 ++++++-----
> 1 file changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c
> index 27926a06df32..2bf63035a295 100644
> --- a/arch/s390/mm/gmap.c
> +++ b/arch/s390/mm/gmap.c
> @@ -2552,15 +2552,16 @@ int gmap_mark_unmergeable(void)
> {
> struct mm_struct *mm = current->mm;
> struct vm_area_struct *vma;
> + int ret = 0;
>
> for (vma = mm->mmap; vma; vma = vma->vm_next) {
> - if (ksm_madvise(vma, vma->vm_start, vma->vm_end,
> - MADV_UNMERGEABLE, &vma->vm_flags)) {
> - return -ENOMEM;
> - }
> + ret = ksm_madvise(vma, vma->vm_start, vma->vm_end,
> + MADV_UNMERGEABLE, &vma->vm_flags);
> + if (ret)
> + return ret;
> }
> mm->def_flags &= ~VM_MERGEABLE;
> - return 0;
> + return ret;
That part is not really necessary but also doesn't hurt.
> }
> EXPORT_SYMBOL_GPL(gmap_mark_unmergeable);
>
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