Patch "mm: Fix is_zero_page() usage in try_grab_page()" has been added to the 6.1-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    mm: Fix is_zero_page() usage in try_grab_page()

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mm-fix-is_zero_page-usage-in-try_grab_page.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From alex.williamson@redhat.com  Tue Apr 22 10:00:53 2025
From: Alex Williamson <alex.williamson@redhat.com>
Date: Wed, 16 Apr 2025 14:24:39 -0600
Subject: mm: Fix is_zero_page() usage in try_grab_page()
Cc: Alex Williamson <alex.williamson@redhat.com>, Salvatore Bonaccorso <carnil@debian.org>, Milan Broz <gmazyland@gmail.com>, stable@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Sasha Levin <sashal@kernel.org>
Message-ID: <20250416202441.3911142-1-alex.williamson@redhat.com>

From: Alex Williamson <alex.williamson@redhat.com>

The backport of upstream commit c8070b787519 ("mm: Don't pin ZERO_PAGE
in pin_user_pages()") into v6.1.130 noted below in Fixes does not
account for commit 0f0892356fa1 ("mm: allow multiple error returns in
try_grab_page()"), which changed the return value of try_grab_page()
from bool to int.  Therefore returning 0, success in the upstream
version, becomes an error here.  Fix the return value.

Fixes: 476c1dfefab8 ("mm: Don't pin ZERO_PAGE in pin_user_pages()")
Link: https://lore.kernel.org/all/Z_6uhLQjJ7SSzI13@eldamar.lan
Reported-by: Salvatore Bonaccorso <carnil@debian.org>
Reported-by: Milan Broz <gmazyland@gmail.com>
Cc: stable@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 mm/gup.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/gup.c
+++ b/mm/gup.c
@@ -232,7 +232,7 @@ bool __must_check try_grab_page(struct p
 		 * and it is used in a *lot* of places.
 		 */
 		if (is_zero_page(page))
-			return 0;
+			return true;
 
 		/*
 		 * Similar to try_grab_folio(): be sure to *also*


Patches currently in stable-queue which might be from alex.williamson@redhat.com are

queue-6.1/mm-fix-is_zero_page-usage-in-try_grab_page.patch
queue-6.1/revert-pci-avoid-reset-when-disabled-via-sysfs.patch