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[S390] mm: add devmem_is_allowed() for STRICT_DEVMEM checking
authorHendrik Brueckner <brueckner@linux.vnet.ibm.com>
Wed, 10 Nov 2010 09:05:55 +0000 (10:05 +0100)
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>
Wed, 10 Nov 2010 09:05:54 +0000 (10:05 +0100)
Provide the devmem_is_allowed() routine to restrict access to
kernel memory from userspace.
Set the CONFIG_STRICT_DEVMEM config option to switch on checking.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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