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The new renameat2 syscall provides all the functionality of renameat with an additional flags argument, so make renameat optional so that future architectures can omit it without getting a warning. This patch doesn't affect existing architectures. Signed-off-by: James Hogan <[email protected]> Acked-by: Arnd Bergmann <[email protected]> Signed-off-by: Miklos Szeredi <[email protected]> Cc: [email protected]