linux-kernel - Re: [PATCH] staging: amso1100: fix format string for 64-bit phys

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Date:	Thu, 4 Feb 2016 07:15:05 -0500
From:	Doug Ledford <dledford@...hat.com>
To:	Arnd Bergmann <arnd@...db.de>, Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-rdma@...r.kernel.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] staging: amso1100: fix format string for 64-bit phys_addr

On 02/01/2016 11:34 AM, Arnd Bergmann wrote:
> The amso1100 driver prints a phys_addr_t by casting it to a pointer,
> which causes a warning when phys_addr_t is 64-bit and pointers
> are 32-bit:
> 
> drivers/staging/rdma/amso1100/c2.c: In function 'c2_rx_error':
> drivers/staging/rdma/amso1100/c2.c:430:4: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
> 
> This changes the format string to print the address as a 64-bit
> number all the time to avoids the warnings. Ideally we would use
> the %pap format string for phys_addr_t, but that doesn't work
> here easily as it requires passing a pointer to the address.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> Found on ARM randconfig testing. This must have been there forever but is
> rather hard to trigger even with randconfig builds.
> 
> diff --git a/drivers/staging/rdma/amso1100/c2.c b/drivers/staging/rdma/amso1100/c2.c
> index b46ebd1ae15a..170a42a60552 100644
> --- a/drivers/staging/rdma/amso1100/c2.c
> +++ b/drivers/staging/rdma/amso1100/c2.c
> @@ -426,8 +426,8 @@ static void c2_rx_error(struct c2_port *c2_port, struct c2_element *elem)
>  		pr_debug("    index : %Zu\n",
>  			elem - c2_port->rx_ring.start);
>  		pr_debug("    len   : %u\n", rx_desc->len);
> -		pr_debug("  rxp_hdr : %p [PA %p]\n", rxp_hdr,
> -			(void *) __pa((unsigned long) rxp_hdr));
> +		pr_debug("  rxp_hdr : %p [PA %016llx\n", rxp_hdr,
> +			(u64)__pa((unsigned long) rxp_hdr));
>  		pr_debug("    flags : 0x%x\n", rxp_hdr->flags);
>  		pr_debug("    status: 0x%x\n", rxp_hdr->status);
>  		pr_debug("    len   : %u\n", rxp_hdr->len);
> 

I've sent off a deletion of this file to Linus already, sorry.

-- 
Doug Ledford <dledford@...hat.com>
              GPG KeyID: 0E572FDD



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