On Tue, Sep 14, 2021 at 05:31:32PM -0600, Jane Chu wrote:

+static int pmem_dax_clear_poison(struct dax_device *dax_dev, pgoff_t pgoff,
+					size_t nr_pages)
+{
+	unsigned int len = PFN_PHYS(nr_pages);
+	sector_t sector = PFN_PHYS(pgoff) >> SECTOR_SHIFT;
+	struct pmem_device *pmem = dax_get_private(dax_dev);
+	phys_addr_t pmem_off = sector * 512 + pmem->data_offset;
+	blk_status_t ret;
+
+	if (!is_bad_pmem(&pmem->bb, sector, len))
+		return 0;
+
+	ret = pmem_clear_poison(pmem, pmem_off, len);
+	return (ret == BLK_STS_OK) ? 0 : -EIO;

No need for the braces here (and I'd prefer a good old if anyway).

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>