Commit 9a07f27b authored Mar 17, 2014 by Russell King

ARM: l2c: only write the auxiliary control register if required

Avoid unnecessary writes to the auxiliary control register if the
register already contains the required value. This allows us to
avoid invoking the platforms secure monitor code unnecessarily.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

parent 17f3f99f

arch/arm/mm/cache-l2x0.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -92,6 +92,8 @@ static void l2c_enable(void __iomem *base, u32 aux, unsigned num_lock)
		{
		unsigned long flags;

		/* Only write the aux register if it needs changing */
		if (readl_relaxed(base + L2X0_AUX_CTRL) != aux)
		writel_relaxed(aux, base + L2X0_AUX_CTRL);

		l2c_unlock(base, num_lock);