linux-kernel - Re: linux-next: build failure after merge of the char-misc tree

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Date:   Mon, 20 Mar 2017 13:23:49 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Greg KH <greg@...ah.com>, linux-next@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Cyril Bur <cyrilbur@...il.com>, Joel Stanley <joel@....id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: linux-next: build failure after merge of the char-misc tree

On Mon, Mar 20, 2017 at 3:44 AM, Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> Hi all,
>
> After merging the char-misc tree, today's linux-next build (x86_64
> allmodconfig) failed like this:
>
> drivers/misc/aspeed-lpc-ctrl.c: In function 'aspeed_lpc_ctrl_mmap':
> drivers/misc/aspeed-lpc-ctrl.c:51:9: error: implicit declaration of function 'pgprot_dmacoherent' [-Werror=implicit-function-declaration]
>   prot = pgprot_dmacoherent(prot);

A lot of other drivers (including /dev/mem) just use pgprot_noncached() or
pgprot_writecombine(), which would make the code portable and might be
what you want here as well.

pgprot_dmacoherent() is meant specifically for mapping RAM that is used
for DMA buffers that come from dma_alloc_coherent(), which doesn't seem
to be the case here.

What kind of address range is this really?

> drivers/misc/aspeed-lpc-ctrl.c:51:7: error: incompatible types when assigning to type 'pgprot_t {aka struct pgprot}' from type 'int'
>   prot = pgprot_dmacoherent(prot);
>        ^
> In file included from include/linux/miscdevice.h:6:0,
>                  from drivers/misc/aspeed-lpc-ctrl.c:11:
> drivers/misc/aspeed-lpc-ctrl.c: In function 'aspeed_lpc_ctrl_probe':
> drivers/misc/aspeed-lpc-ctrl.c:232:17: warning: format '%x' expects argument of type 'unsigned int', but argument 3 has type 'phys_addr_t {aka long long unsigned int}' [-Wformat=]
>    dev_info(dev, "Loaded at 0x%08x (0x%08x)\n",

This should just use the "%pap" for printing a phys_addr_t, otherwise we
get the same warning on ARM in some configurations.

      Arnd