linux-kernel - [PATCH] x86: slightly simplify print_mtrr

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Date:	Fri, 06 Jul 2012 15:20:35 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: 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@...e.com>

---
 arch/x86/kernel/cpu/mtrr/generic.c |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

--- 3.5-rc5/arch/x86/kernel/cpu/mtrr/generic.c
+++ 3.5-rc5-x86-mtrr-print-simplify/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))



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