• Christian Borntraeger's avatar
    [S390] s390: disable change bit override · 6af7eea2
    Christian Borntraeger authored
    commit 6a985c61
    ([S390] s390: use change recording override for kernel mapping)
    deactivated the change bit recording for the kernel mapping to
    improve the performance. This works most of the time, but there
    are cases (e.g. kernel runs in home space, futex atomic compare xcmg)
    where we modify user memory with the kernel mapping instead of the
    user mapping.
    Instead of fixing these cases, this patch just deactivates change bit
    override to avoid future problems with other kernel code that might
    use the kernel mapping for user memory.
    
    CC: stable@kernel.org
    Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
    Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
    6af7eea2
vmem.c 8.53 KB