From: Qiaowei Ren Date: Fri, 14 Nov 2014 15:18:27 +0000 (-0800) Subject: x86, mpx: Add MPX-specific mmap interface X-Git-Tag: omap-for-v3.19/fixes-rc1~161^2~9 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=57319d80e1d328e34cb24868a4f4405661485e30;p=pandora-kernel.git x86, mpx: Add MPX-specific mmap interface We have chosen to perform the allocation of bounds tables in kernel (See the patch "on-demand kernel allocation of bounds tables") and to mark these VMAs with VM_MPX. However, there is currently no suitable interface to actually do this. Existing interfaces, like do_mmap_pgoff(), have no way to set a modified ->vm_ops or ->vm_flags and don't hold mmap_sem long enough to let a caller do it. This patch wraps mmap_region() and hold mmap_sem long enough to make the modifications to the VMA which we need. Also note the 32/64-bit #ifdef in the header. We actually need to do this at runtime eventually. But, for now, we don't support running 32-bit binaries on 64-bit kernels. Support for this will come in later patches. Signed-off-by: Qiaowei Ren Signed-off-by: Dave Hansen Cc: linux-mm@kvack.org Cc: linux-mips@linux-mips.org Cc: Dave Hansen Link: http://lkml.kernel.org/r/20141114151827.CE440F67@viggo.jf.intel.com Signed-off-by: Thomas Gleixner --- Reading git-diff-tree failed