On Tue, Mar 21, 2017 at 08:18:05AM -0500, Yazen Ghannam wrote:
> From: Yazen Ghannam <yazen.ghan...@amd.com>
>
> MCA bank 3 is reserved on systems pre-Fam17h, so it didn't have a name.
> However, MCA bank 3 is defined on Fam17h systems and can be accessed using
> legacy MSRs. Without a name we get a stack trace on Fam17h systems when
> trying to register sysfs files for bank 3 on kernels that don't recognize
> Scalable MCA.
>
> Call MCA bank 3 "decode_unit" since this is what it represents on Fam17h.
> This will allow kernels without SMCA support to see this bank on Fam17h+
> and prevent the stack trace. This will not affect older systems since this
> bank is reserved on them, i.e. it'll be ignored.
>
> Tested on AMD Fam15h and Fam17h systems.
>
> WARNING: CPU: 26 PID: 1 at lib/kobject.c:210
> kobject_add_internal+0x23e/0x340()
> kobject: (ffff88085bb256c0): attempted to be registered with empty name!
> ...
> Call Trace:
> [<ffffffff8138fc83>] dump_stack+0x63/0x90
> [<ffffffff810769b6>] warn_slowpath_common+0x86/0xc0
> [<ffffffff81076a3c>] warn_slowpath_fmt+0x4c/0x50
> [<ffffffff8139290e>] ? kobject_add_internal+0x18e/0x340
> [<ffffffff81187f82>] ? kfree_const+0x22/0x30
> [<ffffffff813929be>] kobject_add_internal+0x23e/0x340
> [<ffffffff81187f82>] ? kfree_const+0x22/0x30
> [<ffffffff81392cb8>] kobject_add+0x68/0xb0
> [<ffffffff81392d33>] kobject_create_and_add+0x33/0x70
> [<ffffffff81043c27>] threshold_create_device+0x107/0x350
> [<ffffffff81d7e7aa>] ? mcheck_vendor_init_severity+0x1a/0x1a
> [<ffffffff81d7e7df>] threshold_init_device+0x35/0x4d
> [<ffffffff81002123>] do_one_initcall+0xb3/0x1d0
> [<ffffffff81d6e0f0>] kernel_init_freeable+0x163/0x1f0
> [<ffffffff8176e0f0>] ? rest_init+0x80/0x80
> [<ffffffff8176e0fe>] kernel_init+0xe/0xe0
> [<ffffffff8177a7cf>] ret_from_fork+0x3f/0x70
> [<ffffffff8176e0f0>] ? rest_init+0x80/0x80
>
> Signed-off-by: Yazen Ghannam <yazen.ghan...@amd.com>
> Cc: <sta...@vger.kernel.org> # 3.10..
> ---
> arch/x86/kernel/cpu/mcheck/mce_amd.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c
> b/arch/x86/kernel/cpu/mcheck/mce_amd.c
> index d3e5be8..c82befc 100644
> --- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
> +++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
> @@ -62,7 +62,7 @@ static const char * const th_names[] = {
> "load_store",
> "insn_fetch",
> "combined_unit",
> - "",
> + "decode_unit",
> "northbridge",
> "execution_unit",
> };
> --
Applied, thanks.
--
Regards/Gruss,
Boris.
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284
(AG Nürnberg)
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