linux-kernel - Re: [PATCH] ia64: fix module loading for gcc-5.4

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Date:   Tue, 21 Mar 2017 09:31:23 +0100
From:   Émeric MASCHINO <emeric.maschino@...il.com>
To:     Sergei Trofimovich <slyfox@...too.org>
Cc:     Tony Luck <tony.luck@...el.com>,
        "H . J . Lu" <hjl.tools@...il.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ia64: fix module loading for gcc-5.4

Hi,

Backported and successfully tested on currently stable Gentoo kernel 4.9.6-r1.

>From [1], gcc 4.9.4 was first problematic release.

[1] http://marc.info/?l=linux-ia64&m=147993347915422

     Émeric

2017-03-19 17:20 GMT+01:00 Sergei Trofimovich <slyfox@...too.org>:
> Starting from gcc-5.4+ gcc geperates MLX
> instructions in more cases to refer local
> symbols:
>     https://gcc.gnu.org/bugzilla/60465
>
> That caused ia64 module loader to choke
> on such instructions:
>     fuse: invalid slot number 1 for IMM64
>
> Linux kernel used to handle only case where
> relocation pointed to slot=2 instruction in
> the bundle. That limitation was fixed in linux
> by 9c184a073bfd650cc791956d6ca79725bb682716 commit.
> See http://sources.redhat.com/bugzilla/show_bug.cgi?id=1433
>
> This change lifts the slot=2 restriction from
> linux kernel module loader.
>
> Tested on 'fuse' and 'btrfs' kernel modules.
>
> Cc: H. J. Lu <hjl.tools@...il.com>
> Cc: Tony Luck <tony.luck@...el.com>
> Cc: Fenghua Yu <fenghua.yu@...el.com>
> Cc: linux-ia64@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Bug: https://bugs.gentoo.org/601014
> Signed-off-by: Sergei Trofimovich <slyfox@...too.org>
> ---
>  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 6ab0ae7d6535..d1d945c6bd05 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;
> --
> 2.12.0
>
> --
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