diff options
Diffstat (limited to 'drivers/nvdimm')
| -rw-r--r-- | drivers/nvdimm/pfn_devs.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c index 2ae9a000b090..c500531ca23b 100644 --- a/drivers/nvdimm/pfn_devs.c +++ b/drivers/nvdimm/pfn_devs.c @@ -111,6 +111,29 @@ static ssize_t align_show(struct device *dev, return sprintf(buf, "%ld\n", nd_pfn->align); } +static const unsigned long *nd_pfn_supported_alignments(void) +{ + /* + * This needs to be a non-static variable because the *_SIZE + * macros aren't always constants. + */ + const unsigned long supported_alignments[] = { + PAGE_SIZE, +#ifdef CONFIG_TRANSPARENT_HUGEPAGE + HPAGE_PMD_SIZE, +#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD + HPAGE_PUD_SIZE, +#endif +#endif + 0, + }; + static unsigned long data[ARRAY_SIZE(supported_alignments)]; + + memcpy(data, supported_alignments, sizeof(data)); + + return data; +} + static ssize_t __align_store(struct nd_pfn *nd_pfn, const char *buf) { unsigned long val; @@ -260,6 +283,13 @@ static ssize_t size_show(struct device *dev, } static DEVICE_ATTR_RO(size); +static ssize_t supported_alignments_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return nd_size_select_show(0, nd_pfn_supported_alignments(), buf); +} +static DEVICE_ATTR_RO(supported_alignments); + static struct attribute *nd_pfn_attributes[] = { &dev_attr_mode.attr, &dev_attr_namespace.attr, @@ -267,6 +297,7 @@ static struct attribute *nd_pfn_attributes[] = { &dev_attr_align.attr, &dev_attr_resource.attr, &dev_attr_size.attr, + &dev_attr_supported_alignments.attr, NULL, }; |