[PATCH 0/2] ARM: Wire up userfaultfd and mlock2 syscalls

[PATCH 0/2] ARM: Wire up userfaultfd and mlock2 syscalls

[Thierry Reding]

From: Thierry Reding <treding@nvidia.com>

These are two fairly trivial patches to wire up the userfaultfd and
mlock2 syscalls on 32-bit ARM. I've verified that these work by running
the userfaultfd and mlock2-tests tests from tools/testing/selftests/vm/
and they give good results. Note that mlock2-tests doesn't work without
additional fixups in linux-next needed to remove VM flags clashes.

I suppose this would have to wait until both of the above syscalls have
actually been merged, but I figured I'd post them anyway since I already
did the work and verified that they work.

Thierry

Thierry Reding (2):
  ARM: Wire up userfaultfd syscall
  ARM: Wire up mlock2 syscall

 arch/arm/include/asm/unistd.h      | 2 +-
 arch/arm/include/uapi/asm/unistd.h | 2 ++
 arch/arm/kernel/calls.S            | 2 ++
 3 files changed, 5 insertions(+), 1 deletion(-)

-- 
2.4.5

[PATCH 1/2] ARM: Wire up userfaultfd syscall

[Thierry Reding]

From: Thierry Reding <treding@nvidia.com>

Signed-off-by: Thierry Reding <treding@nvidia.com>
---
 arch/arm/include/asm/unistd.h      | 2 +-
 arch/arm/include/uapi/asm/unistd.h | 1 +
 arch/arm/kernel/calls.S            | 1 +
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm/include/asm/unistd.h b/arch/arm/include/asm/unistd.h
index 32640c431a08..7cba573c2cc9 100644
--- a/arch/arm/include/asm/unistd.h
+++ b/arch/arm/include/asm/unistd.h
@@ -19,7 +19,7 @@
  * This may need to be greater than __NR_last_syscall+1 in order to
  * account for the padding in the syscall table
  */
-#define __NR_syscalls  (388)
+#define __NR_syscalls  (392)
 
 /*
  * *NOTE*: This is a ghost syscall private to the kernel.  Only the
diff --git a/arch/arm/include/uapi/asm/unistd.h b/arch/arm/include/uapi/asm/unistd.h
index 0c3f5a0dafd3..ca96eca3453c 100644
--- a/arch/arm/include/uapi/asm/unistd.h
+++ b/arch/arm/include/uapi/asm/unistd.h
@@ -414,6 +414,7 @@
 #define __NR_memfd_create		(__NR_SYSCALL_BASE+385)
 #define __NR_bpf			(__NR_SYSCALL_BASE+386)
 #define __NR_execveat			(__NR_SYSCALL_BASE+387)
+#define __NR_userfaultfd		(__NR_SYSCALL_BASE+388)
 
 /*
  * The following SWIs are ARM private.
diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
index 05745eb838c5..84c405670ff0 100644
--- a/arch/arm/kernel/calls.S
+++ b/arch/arm/kernel/calls.S
@@ -397,6 +397,7 @@
 /* 385 */	CALL(sys_memfd_create)
 		CALL(sys_bpf)
 		CALL(sys_execveat)
+		CALL(sys_userfaultfd)
 #ifndef syscalls_counted
 .equ syscalls_padding, ((NR_syscalls + 3) & ~3) - NR_syscalls
 #define syscalls_counted
-- 
2.4.5

[PATCH 2/2] ARM: Wire up mlock2 syscall

[Thierry Reding]

From: Thierry Reding <treding@nvidia.com>

Signed-off-by: Thierry Reding <treding@nvidia.com>
---
 arch/arm/include/uapi/asm/unistd.h | 1 +
 arch/arm/kernel/calls.S            | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/arm/include/uapi/asm/unistd.h b/arch/arm/include/uapi/asm/unistd.h
index ca96eca3453c..977831f49576 100644
--- a/arch/arm/include/uapi/asm/unistd.h
+++ b/arch/arm/include/uapi/asm/unistd.h
@@ -415,6 +415,7 @@
 #define __NR_bpf			(__NR_SYSCALL_BASE+386)
 #define __NR_execveat			(__NR_SYSCALL_BASE+387)
 #define __NR_userfaultfd		(__NR_SYSCALL_BASE+388)
+#define __NR_mlock2			(__NR_SYSCALL_BASE+389)
 
 /*
  * The following SWIs are ARM private.
diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
index 84c405670ff0..e9705ba5a1ff 100644
--- a/arch/arm/kernel/calls.S
+++ b/arch/arm/kernel/calls.S
@@ -398,6 +398,7 @@
 		CALL(sys_bpf)
 		CALL(sys_execveat)
 		CALL(sys_userfaultfd)
+		CALL(sys_mlock2)
 #ifndef syscalls_counted
 .equ syscalls_padding, ((NR_syscalls + 3) & ~3) - NR_syscalls
 #define syscalls_counted
-- 
2.4.5