• Christoph Hellwig's avatar
    mm: only allow page table mappings for built-in zsmalloc · b607e6d1
    Christoph Hellwig authored
    This allows to unexport map_vm_area and unmap_kernel_range, which are
    rather deep internal and should not be available to modules, as they for
    example allow fine grained control of mapping permissions, and also
    allow splitting the setup of a vmalloc area and the actual mapping and
    thus expose vmalloc internals.
    
    zsmalloc is typically built-in and continues to work (just like the
    percpu-vm code using a similar patter), while modular zsmalloc also
    continues to work, but must use copies.
    Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Christian Borntraeger <borntraeger@de.ibm.com>
    Cc: Christophe Leroy <christophe.leroy@c-s.fr>
    Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
    Cc: David Airlie <airlied@linux.ie>
    Cc: Gao Xiang <xiang@kernel.org>
    Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Cc: Haiyang Zhang <haiyangz@microsoft.com>
    Cc: Johannes Weiner <hannes@cmpxchg.org>
    Cc: "K. Y. Srinivasan" <kys@microsoft.com>
    Cc: Laura Abbott <labbott@redhat.com>
    Cc: Mark Rutland <mark.rutland@arm.com>
    Cc: Michael Kelley <mikelley@microsoft.com>
    Cc: Minchan Kim <minchan@kernel.org>
    Cc: Nitin Gupta <ngupta@vflare.org>
    Cc: Robin Murphy <robin.murphy@arm.com>
    Cc: Sakari Ailus <sakari.ailus@linux.intel.com>
    Cc: Stephen Hemminger <sthemmin@microsoft.com>
    Cc: Sumit Semwal <sumit.semwal@linaro.org>
    Cc: Wei Liu <wei.liu@kernel.org>
    Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Cc: Catalin Marinas <catalin.marinas@arm.com>
    Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
    Cc: Paul Mackerras <paulus@ozlabs.org>
    Cc: Vasily Gorbik <gor@linux.ibm.com>
    Cc: Will Deacon <will@kernel.org>
    Link: http://lkml.kernel.org/r/20200414131348.444715-12-hch@lst.deSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    b607e6d1
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