x86/mm/mtrr: Slightly simplify print_mtrr_state()

high_width can be easily calculated in a single expression when
making use of __ffs64().

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/4FF71053020000780008E1B5@nat28.tlf.novell.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c
index 75772ae..e9fe907 100644 (file)
--- a/arch/x86/kernel/cpu/mtrr/generic.c
+++ b/arch/x86/kernel/cpu/mtrr/generic.c
@@ -361,11 +361,7 @@ static void __init print_mtrr_state(void)
        }
        pr_debug("MTRR variable ranges %sabled:\n",
                 mtrr_state.enabled & 2 ? "en" : "dis");
-       if (size_or_mask & 0xffffffffUL)
-               high_width = ffs(size_or_mask & 0xffffffffUL) - 1;
-       else
-               high_width = ffs(size_or_mask>>32) + 32 - 1;
-       high_width = (high_width - (32 - PAGE_SHIFT) + 3) / 4;
+       high_width = (__ffs64(size_or_mask) - (32 - PAGE_SHIFT) + 3) / 4;
 
        for (i = 0; i < num_var_ranges; ++i) {
                if (mtrr_state.var_ranges[i].mask_lo & (1 << 11))