mm, soft-offline: convert parameter to pfn

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.

Link: http://lkml.kernel.org/r/20191016234706.GA5493@www9186uo.sakura.ne.jp
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 84c4e1f..d65ecde 100644 (file)
--- 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), 0);
+       ret = soft_offline_page(pfn, 0);
        return ret == 0 ? count : ret;
 }
 

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 06b51d8..19a0e68 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2773,7 +2773,7 @@ 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, int flags);
+extern int soft_offline_page(unsigned long pfn, int flags);
 
 
 /*

diff --git a/mm/madvise.c b/mm/madvise.c
index 94c343b..63e1308 100644 (file)
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -895,7 +895,7 @@ static int madvise_inject_error(int behavior,
                        pr_info("Soft offlining pfn %#lx at process virtual address %#lx\n",
                                        pfn, start);
 
-                       ret = soft_offline_page(page, MF_COUNT_INCREASED);
+                       ret = soft_offline_page(pfn, MF_COUNT_INCREASED);
                        if (ret)
                                return ret;
                        continue;

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 05c8c6d..af27120 100644 (file)
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1476,7 +1476,7 @@ 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), entry.flags);
+                       soft_offline_page(entry.pfn, entry.flags);
                else
                        memory_failure(entry.pfn, entry.flags);
        }
@@ -1857,7 +1857,7 @@ 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
  * @flags: flags. Same as memory_failure().
  *
  * Returns 0 on success, otherwise negated errno.
@@ -1877,18 +1877,17 @@ 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 flags)
+int soft_offline_page(unsigned long pfn, int flags)
 {
        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 (flags & MF_COUNT_INCREASED)
-                       put_page(page);
+       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);