This is a note to let you know that I've just added the patch titled
bcachefs: Fix build on parisc by avoiding __multi3()
to the 6.7-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:
bcachefs-fix-build-on-parisc-by-avoiding-__multi3.patch
and it can be found in the queue-6.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 457e1c3a398411789e04264486769a42cff4cf30 Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@xxxxxxxxxx>
Date: Sun, 28 Jan 2024 09:53:55 +0100
Subject: bcachefs: Fix build on parisc by avoiding __multi3()
From: Helge Deller <deller@xxxxxxxxxx>
commit eba38cc7578bef94865341c73608bdf49193a51d upstream.
The gcc compiler on paric does support the __int128 type, although the
architecture does not have native 128-bit support.
The effect is, that the bcachefs u128_square() function will pull in the
libgcc __multi3() helper, which breaks the kernel build when bcachefs is
built as module since this function isn't currently exported in
arch/parisc/kernel/parisc_ksyms.c.
The build failure can be seen in the latest debian kernel build at:
https://buildd.debian.org/status/fetch.php?pkg=linux&arch=hppa&ver=6.7.1-1%7Eexp1&stamp=1706132569&raw=0
We prefer to not export that symbol, so fall back to the optional 64-bit
implementation provided by bcachefs and thus avoid usage of __multi3().
Signed-off-by: Helge Deller <deller@xxxxxx>
Cc: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Signed-off-by: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/bcachefs/mean_and_variance.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/bcachefs/mean_and_variance.h
+++ b/fs/bcachefs/mean_and_variance.h
@@ -14,7 +14,7 @@
* type
*/
-#ifdef __SIZEOF_INT128__
+#if defined(__SIZEOF_INT128__) && defined(__KERNEL__) && !defined(CONFIG_PARISC)
typedef struct {
unsigned __int128 v;
Patches currently in stable-queue which might be from deller@xxxxxxxxxx are
queue-6.7/bcachefs-fix-build-on-parisc-by-avoiding-__multi3.patch
