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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@arm.com> Acked-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Kevin Brodsky <kevin.brodsky@arm.com> Link: https://lore.kernel.org/r/20250113170619.484698-2-yury.khrustalev@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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