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 <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Yinghai Lu <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c
index 75772ae6c65f81cbc2268120b1fdcf3bad80028f..e9fe907cd2495c9ad6a687f9b45a49c39a5ebd26 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))