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    s390: add DEBUG_RODATA support · 91d37211
    Heiko Carstens 提交于
    git commit d2aa1aca ("mm/init: Add 'rodata=off' boot cmdline
    parameter to disable read-only kernel mappings") adds a bogus warning
    to the console which states that s390 does not support kernel memory
    protection.
    
    This however is not true. We do support that since a couple of years
    however in a different way than the author of the above named patch
    expected.
    
    To get rid of the misleading message implement the mark_rodata_ro
    function and emit a message which states the amount of memory which
    was write protected already earlier.
    
    This is the same what parisc currently does.
    
    We currently do not support the kernel parameter "rodata=off" which
    would allow to write to the rodata section again. However since we
    have this feature since years without any problems there is no reason
    to add support for this.
    Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
    Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
    91d37211
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