[PATCH] OOM killer meets userspace headers

Despite mm.h is not being exported header, it does contain one thing
which is part of userspace ABI -- value disabling OOM killer for given
process. So,
a) create and export include/linux/oom.h
b) move OOM_DISABLE define there.
c) turn bounding values of /proc/$PID/oom_adj into defines and export
   them too.

Note: mass __KERNEL__ removal will be done later.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 11 insertions, 3 deletions

diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index 5114ff18101d..a1155a2beb32 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -120,6 +120,7 @@ header-y += netrom.h
 header-y += nfs2.h
 header-y += nfs4_mount.h
 header-y += nfs_mount.h
+header-y += oom.h
 header-y += param.h
 header-y += pci_ids.h
 header-y += pci_regs.h
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 5a6068ff5556..d538de901965 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1115,9 +1115,6 @@ int in_gate_area_no_task(unsigned long addr);
 #define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);})
 #endif  /* __HAVE_ARCH_GATE_AREA */
 
-/* /proc/<pid>/oom_adj set to -17 protects from the oom-killer */
-#define OOM_DISABLE -17
-
 int drop_caches_sysctl_handler(struct ctl_table *, int, struct file *,
                                         void __user *, size_t *, loff_t *);
 unsigned long shrink_slab(unsigned long scanned, gfp_t gfp_mask,
diff --git a/include/linux/oom.h b/include/linux/oom.h
new file mode 100644
index 000000000000..ad76463629a0
--- /dev/null
+++ b/include/linux/oom.h
@@ -0,0 +1,10 @@
+#ifndef __INCLUDE_LINUX_OOM_H
+#define __INCLUDE_LINUX_OOM_H
+
+/* /proc/<pid>/oom_adj set to -17 protects from the oom-killer */
+#define OOM_DISABLE (-17)
+/* inclusive */
+#define OOM_ADJUST_MIN (-16)
+#define OOM_ADJUST_MAX 15
+
+#endif