dma-buf: Extract dma-buf.rst

Just prep work to polish and consolidate all the dma-buf related
documenation.

Unfortunately I didn't discover a way to both integrate this new file
into the overall toc while keeping it at the current place. Work
around that by moving it into the overall driver-api/index.rst.

Cc: linux-doc@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

path: root/sysctl.h

#ifndef SYSCTL_H
#define SYSCTL_H

#define SYSCTL_PROC_PATH "/proc/sys/"

int sysctl_set_int(const char *file, int value);
int sysctl_get_int(const char *file, int *value);

#endif