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Subject[PATCH] Adds Kconfig option for Cross Memory Attach
Hi Andrew,

Attached is a patch which you asked for a while back which adds a
Kconfig option to allow people who don't want cross memory attach to not
have it included in their build.

Regards,

Chris
--
cyeoh@au.ibm.com

Signed-off-by: Chris Yeoh <yeohc@au1.ibm.com>
Kconfig | 11 +++++++++++
Makefile | 7 +++++--
2 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/mm/Kconfig b/mm/Kconfig
index e338407..7619f90 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -379,3 +379,14 @@ config CLEANCACHE
in a negligible performance hit.

If unsure, say Y to enable cleancache
+
+config CROSS_MEMORY_ATTACH
+ bool "Cross Memory Support"
+ depends on MMU
+ default y
+ help
+ Enabling this option adds the system calls process_vm_readv and
+ process_vm_writev which allow a process with the correct privileges
+ to directly read from or write to to another process's address space.
+ See the man page for more details.
+
diff --git a/mm/Makefile b/mm/Makefile
index 50ec00e..1ddd00f 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -5,8 +5,11 @@
mmu-y := nommu.o
mmu-$(CONFIG_MMU) := fremap.o highmem.o madvise.o memory.o mincore.o \
mlock.o mmap.o mprotect.o mremap.o msync.o rmap.o \
- vmalloc.o pagewalk.o pgtable-generic.o \
- process_vm_access.o
+ vmalloc.o pagewalk.o pgtable-generic.o
+
+ifdef CONFIG_CROSS_MEMORY_ATTACH
+mmu-$(CONFIG_MMU) += process_vm_access.o
+endif

obj-y := filemap.o mempool.o oom_kill.o fadvise.o \
maccess.o page_alloc.o page-writeback.o \


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