On 17.10.19 16:21, Oscar Salvador wrote:
From: Naoya Horiguchi <[email protected]>
Currently soft_offline_page() receives struct page, and its sibling
memory_failure() receives pfn. This discrepancy looks weird and makes
precheck on pfn validity tricky. So let's align them.
Signed-off-by: Naoya Horiguchi <[email protected]>
Signed-off-by: Oscar Salvador <[email protected]>
---
drivers/base/memory.c | 7 +------
include/linux/mm.h | 2 +-
mm/madvise.c | 2 +-
mm/memory-failure.c | 17 +++++++++--------
4 files changed, 12 insertions(+), 16 deletions(-)
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index b3cae2eb1c4f..b510b4d176c9 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -538,12 +538,7 @@ static ssize_t soft_offline_page_store(struct device *dev,
if (kstrtoull(buf, 0, &pfn) < 0)
return -EINVAL;
pfn >>= PAGE_SHIFT;
- if (!pfn_valid(pfn))
- return -ENXIO;
- /* Only online pages can be soft-offlined (esp., not ZONE_DEVICE). */
- if (!pfn_to_online_page(pfn))
- return -EIO;
- ret = soft_offline_page(pfn_to_page(pfn));
+ ret = soft_offline_page(pfn);
return ret == 0 ? count : ret;
}
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 0f80a1ce4e86..40722854d357 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2791,7 +2791,7 @@ extern int sysctl_memory_failure_early_kill;
extern int sysctl_memory_failure_recovery;
extern void shake_page(struct page *p, int access);
extern atomic_long_t num_poisoned_pages __read_mostly;
-extern int soft_offline_page(struct page *page);
+extern int soft_offline_page(unsigned long pfn);
/*
diff --git a/mm/madvise.c b/mm/madvise.c
index 9ca48345ce45..f83b7d4c68c1 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -890,7 +890,7 @@ static int madvise_inject_error(int behavior,
if (behavior == MADV_SOFT_OFFLINE) {
pr_info("Soft offlining pfn %#lx at process virtual address
%#lx\n",
pfn, start);
- ret = soft_offline_page(page);
+ ret = soft_offline_page(pfn);
} else {
pr_info("Injecting memory failure for pfn %#lx at process
virtual address %#lx\n",
pfn, start);
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index c038896bedf0..bfecb61fc064 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1521,7 +1521,7 @@ static void memory_failure_work_func(struct work_struct
*work)
if (!gotten)
break;
if (entry.flags & MF_SOFT_OFFLINE)
- soft_offline_page(pfn_to_page(entry.pfn));
+ soft_offline_page(entry.pfn);
else
memory_failure(entry.pfn, entry.flags);
}
@@ -1834,7 +1834,7 @@ static int soft_offline_free_page(struct page *page)
/**
* soft_offline_page - Soft offline a page.
- * @page: page to offline
+ * @pfn: pfn to soft-offline
*
* Returns 0 on success, otherwise negated errno.
*
@@ -1853,16 +1853,17 @@ static int soft_offline_free_page(struct page *page)
* This is not a 100% solution for all memory, but tries to be
* ``good enough'' for the majority of memory.
*/
-int soft_offline_page(struct page *page)
+int soft_offline_page(unsigned long pfn)
{
int ret;
- unsigned long pfn = page_to_pfn(page);
+ struct page *page;
- if (is_zone_device_page(page)) {
- pr_debug_ratelimited("soft_offline: %#lx page is device page\n",
- pfn);
+ if (!pfn_valid(pfn))
+ return -ENXIO;
+ /* Only online pages can be soft-offlined (esp., not ZONE_DEVICE). */
+ page = pfn_to_online_page(pfn);
+ if (!page)
return -EIO;
- }
if (PageHWPoison(page)) {
pr_info("soft offline: %#lx page already poisoned\n", pfn);
Reviewed-by: David Hildenbrand <[email protected]>
--
Thanks,
David / dhildenb
