This is a note to let you know that I've just added the patch titled
ia64: fix module loading for gcc-5.4
to the 4.4-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:
ia64-fix-module-loading-for-gcc-5.4.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Mar 22 14:57:32 CET 2018
From: Sergei Trofimovich <slyfox@xxxxxxxxxx>
Date: Mon, 1 May 2017 11:51:55 -0700
Subject: ia64: fix module loading for gcc-5.4
From: Sergei Trofimovich <slyfox@xxxxxxxxxx>
[ Upstream commit a25fb8508c1b80dce742dbeaa4d75a1e9f2c5617 ]
Starting from gcc-5.4+ gcc generates MLX instructions in more cases to
refer local symbols:
https://gcc.gnu.org/PR60465
That caused ia64 module loader to choke on such instructions:
fuse: invalid slot number 1 for IMM64
The Linux kernel used to handle only case where relocation pointed to
slot=2 instruction in the bundle. That limitation was fixed in linux by
commit 9c184a073bfd ("[IA64] Fix 2.6 kernel for the new ia64 assembler")
See
http://sources.redhat.com/bugzilla/show_bug.cgi?id=1433
This change lifts the slot=2 restriction from the kernel module loader.
Tested on 'fuse' and 'btrfs' kernel modules.
Cc: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
Cc: H J Lu <hjl.tools@xxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Bug: https://bugs.gentoo.org/601014
Tested-by: Émeric MASCHINO <emeric.maschino@xxxxxxxxx>
Signed-off-by: Sergei Trofimovich <slyfox@xxxxxxxxxx>
Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/ia64/kernel/module.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/ia64/kernel/module.c
+++ b/arch/ia64/kernel/module.c
@@ -153,7 +153,7 @@ slot (const struct insn *insn)
static int
apply_imm64 (struct module *mod, struct insn *insn, uint64_t val)
{
- if (slot(insn) != 2) {
+ if (slot(insn) != 1 && slot(insn) != 2) {
printk(KERN_ERR "%s: invalid slot number %d for IMM64\n",
mod->name, slot(insn));
return 0;
@@ -165,7 +165,7 @@ apply_imm64 (struct module *mod, struct
static int
apply_imm60 (struct module *mod, struct insn *insn, uint64_t val)
{
- if (slot(insn) != 2) {
+ if (slot(insn) != 1 && slot(insn) != 2) {
printk(KERN_ERR "%s: invalid slot number %d for IMM60\n",
mod->name, slot(insn));
return 0;
Patches currently in stable-queue which might be from slyfox@xxxxxxxxxx are
queue-4.4/ia64-fix-module-loading-for-gcc-5.4.patch