From: Sergei Trofimovich slyfox@gentoo.org
[ Upstream commit a25fb8508c1b80dce742dbeaa4d75a1e9f2c5617 ]
Starting from gcc-5.4+ gcc generates MLX instructions in more cases to refer local symbols:
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@users.sourceforge.net Cc: H J Lu hjl.tools@gmail.com Cc: Fenghua Yu fenghua.yu@intel.com Cc: Andrew Morton akpm@linux-foundation.org Bug: https://bugs.gentoo.org/601014 Tested-by: Émeric MASCHINO emeric.maschino@gmail.com Signed-off-by: Sergei Trofimovich slyfox@gentoo.org Signed-off-by: Tony Luck tony.luck@intel.com Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- arch/ia64/kernel/module.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/ia64/kernel/module.c b/arch/ia64/kernel/module.c index b15933c31b2f..36b2c94a8eb5 100644 --- 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 insn *insn, uint64_t val) 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;