diff options
| author |   Qiaowei Ren <qiaowei.ren@intel.com> | 2014-11-14 07:18:27 -0800 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2014-11-18 00:58:53 +0100 |
| commit | 57319d80e1d328e34cb24868a4f4405661485e30 (patch) | |
| tree | bf8d64fe730c72f9e52717cc7ff7389aa44ba209 /arch/x86/Kconfig | |
| parent | x86, mpx: Introduce VM_MPX to indicate that a VMA is MPX specific (diff) | |
| download | linux-dev-57319d80e1d328e34cb24868a4f4405661485e30.tar.xz linux-dev-57319d80e1d328e34cb24868a4f4405661485e30.zip | |
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 <qiaowei.ren@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: linux-mm@kvack.org
Cc: linux-mips@linux-mips.org
Cc: Dave Hansen <dave@sr71.net>
Link: http://lkml.kernel.org/r/20141114151827.CE440F67@viggo.jf.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index ded8a6774ac9..967dfe0ba85e 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -248,6 +248,10 @@ config HAVE_INTEL_TXT def_bool y depends on INTEL_IOMMU && ACPI +config X86_INTEL_MPX + def_bool y + depends on CPU_SUP_INTEL + config X86_32_SMP def_bool y depends on X86_32 && SMP |