linux-kernel - Re: [PATCH v2] perf/x86/uncore: fix compilation warning in snb_uncore_imc_init

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Date:	Tue, 15 Apr 2014 23:35:10 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	sfr@...b.auug.org.au, hpa@...or.com
Subject: Re: [PATCH v2] perf/x86/uncore: fix compilation warning in
 snb_uncore_imc_init_box()

On Wed, Mar 12, 2014 at 12:53:30AM +0100, Stephane Eranian wrote:
> 
> This patch fixes a compilation problem (unused variable) with the
> new SNB/IVB/HSW uncore IMC code.
> 
> In V2, we simplify the fix as suggested by Peter Zjilstra.
> 
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Signed-off-by: Stephane Eranian <eranian@...gle.com>
> --
> 
> diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
> index 3e5b240..d614f6b 100644
> --- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
> +++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
> @@ -1722,15 +1722,16 @@ static struct attribute_group snb_uncore_imc_format_group = {
>  static void snb_uncore_imc_init_box(struct intel_uncore_box *box)
>  {
>  	struct pci_dev *pdev = box->pci_dev;
> -	u32 addr_lo, addr_hi;
> +	int where = SNB_UNCORE_PCI_IMC_BAR_OFFSET;
> +	u32 pci_dword;
>  	resource_size_t addr;
>  
> -	pci_read_config_dword(pdev, SNB_UNCORE_PCI_IMC_BAR_OFFSET, &addr_lo);
> -	addr = addr_lo;
> +	pci_read_config_dword(pdev, where, &pci_dword);
> +	addr = pci_dword;
>  
>  #ifdef CONFIG_PHYS_ADDR_T_64BIT
> -	pci_read_config_dword(pdev, SNB_UNCORE_PCI_IMC_BAR_OFFSET+4, &addr_hi);
> -	addr = ((resource_size_t)addr_hi << 32) | addr_lo;
> +	  pci_read_config_dword(pdev, where + 4, &pci_dword);
> +	  addr |= ((resource_size_t)pci_dword << 32);
>  #endif
>  
>  	addr &= ~(PAGE_SIZE - 1);

I see the warning on my laptop (X1 Carbon), which probably related to the commit:

[    0.559204] ------------[ cut here ]------------
[    0.559216] WARNING: CPU: 2 PID: 1 at /home/kas/git/public/linux/arch/x86/mm/ioremap.c:171 __ioremap_caller+0x2e3/0x390()
[    0.559225] Info: mapping multiple BARs. Your kernel is fine.
[    0.559230] Modules linked in:

[    0.559238] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 3.15.0-rc1-00012-g55101e2d6ce1 #38
[    0.559246] Hardware name: LENOVO 3460CC6/3460CC6, BIOS G6ET93WW (2.53 ) 02/04/2013
[    0.559254]  0000000000000009 ffff8801182f3b60 ffffffff81a2274e ffff8801182f3ba8
[    0.559264]  ffff8801182f3b98 ffffffff810db97d ffffc90000658000 00000000fed16000
[    0.559274]  ffffc90000658000 ffffc90000658000 0000000000006000 ffff8801182f3bf8
[    0.559284] Call Trace:
[    0.559293]  [<ffffffff81a2274e>] dump_stack+0x4d/0x6f
[    0.559300]  [<ffffffff810db97d>] warn_slowpath_common+0x7d/0xa0
[    0.559307]  [<ffffffff810db9ec>] warn_slowpath_fmt+0x4c/0x50
[    0.559316]  [<ffffffff810e39dc>] ? iomem_map_sanity_check+0xac/0xe0
[    0.559324]  [<ffffffff810a8823>] __ioremap_caller+0x2e3/0x390
[    0.559332]  [<ffffffff810a88e7>] ioremap_nocache+0x17/0x20
[    0.559339]  [<ffffffff81083845>] snb_uncore_imc_init_box+0x65/0x90
[    0.559348]  [<ffffffff810827c8>] uncore_pci_probe+0xd8/0x1b0
[    0.559356]  [<ffffffff8140f255>] local_pci_probe+0x45/0xa0
[    0.559364]  [<ffffffff8140e9c5>] ? pci_match_device+0xc5/0xd0
[    0.559371]  [<ffffffff8140f389>] pci_device_probe+0xd9/0x130
[    0.559379]  [<ffffffff81598987>] driver_probe_device+0x87/0x390
[    0.559385]  [<ffffffff81598d63>] __driver_attach+0x93/0xa0
[    0.559392]  [<ffffffff81598cd0>] ? __device_attach+0x40/0x40
[    0.559401]  [<ffffffff815968bb>] bus_for_each_dev+0x6b/0xb0
[    0.559408]  [<ffffffff815983ae>] driver_attach+0x1e/0x20
[    0.559415]  [<ffffffff81597f88>] bus_add_driver+0x188/0x260
[    0.559425]  [<ffffffff8237e179>] ? uncore_pmu_register+0xdb/0xdb
[    0.559432]  [<ffffffff815993c4>] driver_register+0x64/0xf0
[    0.559439]  [<ffffffff8237e179>] ? uncore_pmu_register+0xdb/0xdb
[    0.559446]  [<ffffffff8140eb30>] __pci_register_driver+0x60/0x70
[    0.559454]  [<ffffffff8237e2ee>] intel_uncore_init+0x175/0x42b
[    0.559461]  [<ffffffff8237e179>] ? uncore_pmu_register+0xdb/0xdb
[    0.559470]  [<ffffffff8100216a>] do_one_initcall+0xfa/0x1b0
[    0.559479]  [<ffffffff811035e5>] ? parse_args+0x225/0x3f0
[    0.559487]  [<ffffffff8236e17c>] kernel_init_freeable+0x1da/0x25f
[    0.559495]  [<ffffffff8236d8e5>] ? do_early_param+0x88/0x88
[    0.559504]  [<ffffffff81a13060>] ? rest_init+0x140/0x140
[    0.559511]  [<ffffffff81a1306e>] kernel_init+0xe/0xf0
[    0.559519]  [<ffffffff81a380bc>] ret_from_fork+0x7c/0xb0
[    0.559526]  [<ffffffff81a13060>] ? rest_init+0x140/0x140
[    0.559538] ---[ end trace 2d7d94a103087769 ]---

-- 
 Kirill A. Shutemov
--
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