linux-kernel - Re: [PATCH 1/2] x86/mm/pat, drivers/infiniband/ipath: replace WARN() with pr

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Date:	Tue, 23 Jun 2015 09:39:59 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	bp@...e.de, mchehab@....samsung.com, dledford@...hat.com,
	fengguang.wu@...el.com, linux-media@...r.kernel.org,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Luis R. Rodriguez" <mcgrof@...e.com>
Subject: Re: [PATCH 1/2] x86/mm/pat, drivers/infiniband/ipath: replace WARN()
 with pr_warn()


* Luis R. Rodriguez <mcgrof@...not-panic.com> wrote:

> From: "Luis R. Rodriguez" <mcgrof@...e.com>
> 
> On built-in kernels this will always splat. Fix that.
> 
> Reported-by: Fengguang Wu <fengguang.wu@...el.com> [0-day test robot]
> Signed-off-by: Luis R. Rodriguez <mcgrof@...e.com>
> ---
>  drivers/infiniband/hw/ipath/ipath_driver.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/ipath/ipath_driver.c b/drivers/infiniband/hw/ipath/ipath_driver.c
> index 2d7e503..871dbe5 100644
> --- a/drivers/infiniband/hw/ipath/ipath_driver.c
> +++ b/drivers/infiniband/hw/ipath/ipath_driver.c
> @@ -31,6 +31,8 @@
>   * SOFTWARE.
>   */
>  
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
>  #include <linux/sched.h>
>  #include <linux/spinlock.h>
>  #include <linux/idr.h>
> @@ -399,8 +401,8 @@ static int ipath_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
>  	u32 bar0 = 0, bar1 = 0;
>  
>  #ifdef CONFIG_X86_64
> -	if (WARN(pat_enabled(),
> -		 "ipath needs PAT disabled, boot with nopat kernel parameter\n")) {
> +	if (pat_enabled()) {
> +		pr_warn("ipath needs PAT disabled, boot with nopat kernel parameter\n");
>  		ret = -ENODEV;
>  		goto bail;
>  	}

Same observation as for the other patch: please only warn if the hardware is 
present and the driver tries to activate. No need to annoy others.

Thanks,

	Ingo
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