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Commit 5febcbe9 authored by Christopher Yeoh's avatar Christopher Yeoh Committed by Linus Torvalds
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Cross Memory Attach: make it Kconfigurable 



Add a Kconfig option to allow people who don't want cross memory attach to
not have it included in their build.

Signed-off-by: default avatarChris Yeoh <yeohc@au1.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent eb6332a5

mm/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -349,6 +349,16 @@ choice 
	  benefit.

endchoice



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.



#

# UP and nommu archs use km based percpu allocator

#

mm/Makefile

+5 −2
Original line number Diff line number Diff line
@@ -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 \