[PATCH] TESTING: understand clflushopt() compilation error

[Ross Zwisler]

---
 drivers/nvdimm/pmem.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 0ba6a97..3f735a6 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -451,6 +451,20 @@ static int __init pmem_init(void)
 {
 	int error;
 
+	unsigned long clflush_size = boot_cpu_data.x86_clflush_size;
+	const unsigned int size = PAGE_SIZE;
+	void *addr = kmalloc(size, GFP_KERNEL);
+	void *end = addr + size;
+	void *p;
+
+	mb();
+	for (p = (void *)((unsigned long)addr & -clflush_size); p < end;
+			p += clflush_size)
+		clflush(p);
+	mb();
+
+	kfree(addr);
+
 	pmem_major = register_blkdev(0, "pmem");
 	if (pmem_major < 0)
 		return pmem_major;
-- 
2.1.0

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