HWPOISON: return ENXIO on invalid page number

Use a different errno than the usual EIO for invalid page numbers.
This is mainly for better reporting for the injector.

This also avoids calling action_result() with invalid pfn.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 745f610..275f4e2 100644 (file)
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -618,13 +618,11 @@ static struct page_state {
 
 static void action_result(unsigned long pfn, char *msg, int result)
 {
-       struct page *page = NULL;
-       if (pfn_valid(pfn))
-               page = pfn_to_page(pfn);
+       struct page *page = pfn_to_page(pfn);
 
        printk(KERN_ERR "MCE %#lx: %s%s page recovery: %s\n",
                pfn,
-               page && PageDirty(page) ? "dirty " : "",
+               PageDirty(page) ? "dirty " : "",
                msg, action_name[result]);
 }
 
@@ -750,8 +748,10 @@ int __memory_failure(unsigned long pfn, int trapno, int ref)
                panic("Memory failure from trap %d on page %lx", trapno, pfn);
 
        if (!pfn_valid(pfn)) {
-               action_result(pfn, "memory outside kernel control", IGNORED);
-               return -EIO;
+               printk(KERN_ERR
+                      "MCE %#lx: memory outside kernel control\n",
+                      pfn);
+               return -ENXIO;
        }
 
        p = pfn_to_page(pfn);