linux-kernel - Re: 4.6-rc*: Kernel unaligned access at pci_bus_read_config

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Date:	Thu, 9 Jun 2016 20:33:56 +0300
From:	Anatoly Pugachev <matorola@...il.com>
To:	Meelis Roos <mroos@...ux.ee>
Cc:	sparclinux@...r.kernel.org, linux.pci@...r.kernel.org,
	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: 4.6-rc*: Kernel unaligned access at pci_bus_read_config_dword+0x64/0x80

On Thu, Jun 2, 2016 at 10:11 PM, Meelis Roos <mroos@...ux.ee> wrote:
> Between 4.5.0 and 4.6.0-rc3, my Spar Enterprise T5120 has started
> showing the following messages during bootup:
>
> [   64.564608] Kernel unaligned access at TPC[69fb04] pci_bus_read_config_dword+0x64/0x80
> [   64.564688] Kernel unaligned access at TPC[69fb04] pci_bus_read_config_dword+0x64/0x80
> [   64.564760] Kernel unaligned access at TPC[69fb04] pci_bus_read_config_dword+0x64/0x80
> [   64.564832] Kernel unaligned access at TPC[69fb04] pci_bus_read_config_dword+0x64/0x80
> [   64.564904] Kernel unaligned access at TPC[69fb04] pci_bus_read_config_dword+0x64/0x80

got the same messages on my t5120 with kernel 4.6.1 :

Jun 09 15:48:24 nvg5120 kernel: io scheduler cfq registered (default)
Jun 09 15:48:24 nvg5120 kernel: Kernel unaligned access at TPC[73b92c]
pci_bus_read_config_dword+0x6c/0x80
Jun 09 15:48:24 nvg5120 kernel: Kernel unaligned access at TPC[73b92c]
pci_bus_read_config_dword+0x6c/0x80
Jun 09 15:48:24 nvg5120 kernel: Kernel unaligned access at TPC[73b92c]
pci_bus_read_config_dword+0x6c/0x80
Jun 09 15:48:24 nvg5120 kernel: Kernel unaligned access at TPC[73b92c]
pci_bus_read_config_dword+0x6c/0x80
Jun 09 15:48:24 nvg5120 kernel: Kernel unaligned access at TPC[73b92c]
pci_bus_read_config_dword+0x6c/0x80
Jun 09 15:48:24 nvg5120 kernel: f0286d78: ttyS0 at I/O 0x0 (irq = 17,
base_baud = 115200) is a SUN4V HCONS

but 4.7.0-rc2+ (from git), does not have it, probably fixed.