Re: Machine check recovery broken in v6.9-rc1

Oscar Salvador
2024-04-06T04:14:10Z

On Sat, Apr 06, 2024 at 05:54:47AM +0200, Oscar Salvador wrote:
> Sorry, I was still sleepy and I made a typo.
> Plus I realized we need to move some definitions to make them available.
>
> This should have been (compile tested only):

This one is against 6.1 (previous one was against v6.9-rc2):
Again, compile tested only

diff --git a/include/linux/swapops.h b/include/linux/swapops.h
index 578212fbf2be..5d720f15e811 100644
--- a/include/linux/swapops.h
+++ b/include/linux/swapops.h
@@ -313,6 +313,55 @@ static inline int is_readable_migration_entry(swp_entry_t entry)

#endif /* CONFIG_MIGRATION */

+#ifdef CONFIG_MEMORY_FAILURE
+
+extern atomic_long_t num_poisoned_pages __read_mostly;
+
+/*
+ * Support for hardware poisoned pages
+ */
+static inline swp_entry_t make_hwpoison_entry(struct page *page)
+{
+ BUG_ON(!PageLocked(page));
+ return swp_entry(SWP_HWPOISON, page_to_pfn(page));
+}
+
+static inline int is_hwpoison_entry(swp_entry_t entry)
+{
+ return swp_type(entry) == SWP_HWPOISON;
+}
+
+static inline void num_poisoned_pages_inc(void)
+{
+ atomic_long_inc(&num_poisoned_pages);
+}
+
+static inline void num_poisoned_pages_sub(long i)
+{
+ atomic_long_sub(i, &num_poisoned_pages);
+}
+
+#else /* CONFIG_MEMORY_FAILURE */
+
+static inline swp_entry_t make_hwpoison_entry(struct page *page)
+{
+ return swp_entry(0, 0);
+}
+
+static inline int is_hwpoison_entry(swp_entry_t swp)
+{
+ return 0;
+}
+
+static inline void num_poisoned_pages_inc(void)
+{
+}
+
+static inline void num_poisoned_pages_sub(long i)
+{
+}
+#endif /* CONFIG_MEMORY_FAILURE */
+
typedef unsigned long pte_marker;

#define PTE_MARKER_UFFD_WP BIT(0)
@@ -416,7 +465,7 @@ static inline bool is_pfn_swap_entry(swp_entry_t entry)
BUILD_BUG_ON(SWP_TYPE_SHIFT < SWP_PFN_BITS);

return is_migration_entry(entry) || is_device_private_entry(entry) ||
- is_device_exclusive_entry(entry);
+ is_device_exclusive_entry(entry) || is_hwpoison_entry(entry);
}

struct page_vma_mapped_walk;
@@ -485,55 +534,6 @@ static inline int is_pmd_migration_entry(pmd_t pmd)
}
#endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */

-#ifdef CONFIG_MEMORY_FAILURE
-
-extern atomic_long_t num_poisoned_pages __read_mostly;
-
-/*
- * Support for hardware poisoned pages
- */
-static inline swp_entry_t make_hwpoison_entry(struct page *page)
-{
- BUG_ON(!PageLocked(page));
- return swp_entry(SWP_HWPOISON, page_to_pfn(page));
-}
-
-static inline int is_hwpoison_entry(swp_entry_t entry)
-{
- return swp_type(entry) == SWP_HWPOISON;
-}
-
-static inline void num_poisoned_pages_inc(void)
-{
- atomic_long_inc(&num_poisoned_pages);
-}
-
-static inline void num_poisoned_pages_sub(long i)
-{
- atomic_long_sub(i, &num_poisoned_pages);
-}
-
-#else /* CONFIG_MEMORY_FAILURE */
-
-static inline swp_entry_t make_hwpoison_entry(struct page *page)
-{
- return swp_entry(0, 0);
-}
-
-static inline int is_hwpoison_entry(swp_entry_t swp)
-{
- return 0;
-}
-
-static inline void num_poisoned_pages_inc(void)
-{
-}
-
-static inline void num_poisoned_pages_sub(long i)
-{
-}
-#endif /* CONFIG_MEMORY_FAILURE */
-
static inline int non_swap_entry(swp_entry_t entry)
{
return swp_type(entry) >= MAX_SWAPFILES;

--
Oscar Salvador
SUSE Labs