scftorture: Count single_rpc offline failures in statistics outputgrafted

scf_torture_stats_print() aggregates each invoker thread's counters
into a local scf_statistics structure before printing, but the
n_single_rpc_ofl field is missing from the aggregation loop.  As a
result, the "single_rpc_ofl" value printed in the statistics line is
always zero, even when smp_call_function_single() invocations for the
RPC test have failed due to offline CPUs and been counted by the
invoker threads.

Add the missing accumulation so that the printed value reflects the
actual counts.

Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

1 files changed, 113 insertions, 0 deletions

diff --git a/arch/mips/lib/mips-atomic.c b/arch/mips/lib/mips-atomic.c
new file mode 100644
index 000000000..a9b72eacf
--- /dev/null
+++ b/arch/mips/lib/mips-atomic.c
@@ -0,0 +1,113 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1994, 95, 96, 97, 98, 99, 2003 by Ralf Baechle
+ * Copyright (C) 1996 by Paul M. Antoine
+ * Copyright (C) 1999 Silicon Graphics
+ * Copyright (C) 2000 MIPS Technologies, Inc.
+ */
+#include <asm/irqflags.h>
+#include <asm/hazards.h>
+#include <linux/compiler.h>
+#include <linux/preempt.h>
+#include <linux/export.h>
+#include <linux/stringify.h>
+
+#if !defined(CONFIG_CPU_HAS_DIEI)
+
+/*
+ * For cli() we have to insert nops to make sure that the new value
+ * has actually arrived in the status register before the end of this
+ * macro.
+ * R4000/R4400 need three nops, the R4600 two nops and the R10000 needs
+ * no nops at all.
+ */
+/*
+ * For TX49, operating only IE bit is not enough.
+ *
+ * If mfc0 $12 follows store and the mfc0 is last instruction of a
+ * page and fetching the next instruction causes TLB miss, the result
+ * of the mfc0 might wrongly contain EXL bit.
+ *
+ * ERT-TX49H2-027, ERT-TX49H3-012, ERT-TX49HL3-006, ERT-TX49H4-008
+ *
+ * Workaround: mask EXL bit of the result or place a nop before mfc0.
+ */
+notrace void arch_local_irq_disable(void)
+{
+	preempt_disable_notrace();
+
+	__asm__ __volatile__(
+	"	.set	push						\n"
+	"	.set	noat						\n"
+	"	mfc0	$1,$12						\n"
+	"	ori	$1,0x1f						\n"
+	"	xori	$1,0x1f						\n"
+	"	.set	noreorder					\n"
+	"	mtc0	$1,$12						\n"
+	"	" __stringify(__irq_disable_hazard) "			\n"
+	"	.set	pop						\n"
+	: /* no outputs */
+	: /* no inputs */
+	: "memory");
+
+	preempt_enable_notrace();
+}
+EXPORT_SYMBOL(arch_local_irq_disable);
+
+notrace unsigned long arch_local_irq_save(void)
+{
+	unsigned long flags;
+
+	preempt_disable_notrace();
+
+	__asm__ __volatile__(
+	"	.set	push						\n"
+	"	.set	reorder						\n"
+	"	.set	noat						\n"
+	"	mfc0	%[flags], $12					\n"
+	"	ori	$1, %[flags], 0x1f				\n"
+	"	xori	$1, 0x1f					\n"
+	"	.set	noreorder					\n"
+	"	mtc0	$1, $12						\n"
+	"	" __stringify(__irq_disable_hazard) "			\n"
+	"	.set	pop						\n"
+	: [flags] "=r" (flags)
+	: /* no inputs */
+	: "memory");
+
+	preempt_enable_notrace();
+
+	return flags;
+}
+EXPORT_SYMBOL(arch_local_irq_save);
+
+notrace void arch_local_irq_restore(unsigned long flags)
+{
+	unsigned long __tmp1;
+
+	preempt_disable_notrace();
+
+	__asm__ __volatile__(
+	"	.set	push						\n"
+	"	.set	noreorder					\n"
+	"	.set	noat						\n"
+	"	mfc0	$1, $12						\n"
+	"	andi	%[flags], 1					\n"
+	"	ori	$1, 0x1f					\n"
+	"	xori	$1, 0x1f					\n"
+	"	or	%[flags], $1					\n"
+	"	mtc0	%[flags], $12					\n"
+	"	" __stringify(__irq_disable_hazard) "			\n"
+	"	.set	pop						\n"
+	: [flags] "=r" (__tmp1)
+	: "0" (flags)
+	: "memory");
+
+	preempt_enable_notrace();
+}
+EXPORT_SYMBOL(arch_local_irq_restore);
+
+#endif /* !CONFIG_CPU_HAS_DIEI */