On 06/25/14 10:30, Sudeep Holla wrote:

+
+/*
+ * Which cache CCSIDR represents depends on CSSELR value
+ * Make sure no one else changes CSSELR during this
+ * smp_call_function_single prevents preemption for us
+ */

Where's the smp_call_function_single() or preemption disable happening?

+static inline u32 get_ccsidr(u32 csselr)
+{
+	u32 ccsidr;
+
+	/* Put value into CSSELR */
+	asm volatile ("mcr p15, 2, %0, c0, c0, 0" : : "r" (csselr));
+	isb();
+	/* Read result out of CCSIDR */
+	asm volatile ("mrc p15, 1, %0, c0, c0, 0" : "=r" (ccsidr));
+
+	return ccsidr;
+}
+

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