Yury Khrustalev <yury.khrustalev@xxxxxxx> writes: > Memory protection keys (pkeys) uapi has two macros for pkeys restrictions: > > - PKEY_DISABLE_ACCESS 0x1 > - PKEY_DISABLE_WRITE 0x2 > > with implicit literal value of 0x0 that means "unrestricted". Code that > works with pkeys has to use this literal value when implying that a pkey > imposes no restrictions. This may reduce readability because 0 can be > written in various ways (e.g. 0x0 or 0) and also because 0 in the context > of pkeys can be mistaken for "no permissions" (akin PROT_NONE) while it > actually means "no restrictions". This is important because pkeys are > oftentimes used near mprotect() that uses PROT_ macros. > > This patch adds PKEY_UNRESTRICTED macro defined as 0x0. > > Signed-off-by: Yury Khrustalev <yury.khrustalev@xxxxxxx> > --- > include/uapi/asm-generic/mman-common.h | 1 + > tools/include/uapi/asm-generic/mman-common.h | 1 + > 2 files changed, 2 insertions(+) Apparently you're not meant to modify the copy in tools/, there's a script that does that, which is run by acme, see: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/include/uapi/README cheers
