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

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Date: Sat, 6 Apr 2024 04:18:41 +0200
From: Oscar Salvador <osalvador@...e.de>
To: Tony Luck <tony.luck@...el.com>
Cc: David Hildenbrand <david@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Yazen Ghannam <yazen.ghannam@....com>,
	Miaohe Lin <linmiaohe@...wei.com>,
	Naoya Horiguchi <naoya.horiguchi@....com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Machine check recovery broken in v6.9-rc1

On Fri, Apr 05, 2024 at 04:58:55PM -0700, Tony Luck wrote:
> So a problem (not necessarily the current upstream problem given the
> amount of additional changes that happened) began way back in this
> commit from v6.1:
> 
> 0d206b5d2e0d ("mm/swap: add swp_offset_pfn() to fetch PFN from swap entry")
> 
> This commit gives the "kernel BUG at include/linux/swapops.h:88!" while
> its predecessor runs without errors).

Tony, could you try the following patch, to see if that goes away?
It is against 6.1, but current kernel has the same problem AFAICS.


diff --git a/include/linux/swapops.h b/include/linux/swapops.h
index 578212fbf2be..575d428393c0 100644
--- a/include/linux/swapops.h
+++ b/include/linux/swapops.h
@@ -416,7 +416,7 @@ 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_hwpsoion_entry(entry);
 }

 struct page_vma_mapped_walk;


Thanks


-- 
Oscar Salvador
SUSE Labs