x86/ptrace: Prevent truncation of bitmap size
The active() callback of the IO bitmap regset divides the IO bitmap size by the word size (32/64 bit). As the I/O bitmap size is in bytes the active check fails for bitmap sizes of 1-3 bytes on 32bit and 1-7 bytes on 64bit. Use DIV_ROUND_UP() instead. Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Reviewed-by: NIngo Molnar <mingo@kernel.org> Reviewed-by: NAndy Lutomirski <luto@kernel.org>
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