linux-kernel - Re: [PATCH] staging: ion: chunk_heap: use %pa for printing dma_addr

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Message-ID: <CAMbhsRT=9+Lxir87j0yA2kYa8MUhCLVM6833n_d_CjjwCJAWgA@mail.gmail.com>
Date:	Thu, 9 Apr 2015 15:48:55 -0700
From:	Colin Cross <ccross@...roid.com>
To:	Mitchel Humpherys <mitchelh@...eaurora.org>
Cc:	devel@...uxdriverproject.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Android Kernel Team <kernel-team@...roid.com>,
	John Stultz <john.stultz@...aro.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: ion: chunk_heap: use %pa for printing dma_addr_t's

On Thu, Apr 9, 2015 at 3:31 PM, Mitchel Humpherys
<mitchelh@...eaurora.org> wrote:
> We're currently using %lu and %ld to print some variables of type
> dma_addr_t, which results in the following warning when dma_addr_t is
> 64-bits wide:
>
>     drivers/staging/android/ion/ion_chunk_heap.c: In function 'ion_chunk_heap_create':
>     drivers/staging/android/ion/ion_chunk_heap.c:176:2: warning: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'dma_addr_t' [-Wformat=]
>       pr_info("%s: base %lu size %zu align %ld\n", __func__, chunk_heap->base,
>       ^
>     drivers/staging/android/ion/ion_chunk_heap.c:176:2: warning: format '%ld' expects argument of type 'long int', but argument 5 has type 'dma_addr_t' [-Wformat=]
>
> Fix this by using %pa as instructed in printk-formats.txt.

According to printk-formats.txt, dma_addr_t needs to be printed with %pad.

> Signed-off-by: Mitchel Humpherys <mitchelh@...eaurora.org>
> ---
>  drivers/staging/android/ion/ion_chunk_heap.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/android/ion/ion_chunk_heap.c b/drivers/staging/android/ion/ion_chunk_heap.c
> index 3e6ec2ee6802..f0b7c8e68422 100644
> --- a/drivers/staging/android/ion/ion_chunk_heap.c
> +++ b/drivers/staging/android/ion/ion_chunk_heap.c
> @@ -173,8 +173,8 @@ struct ion_heap *ion_chunk_heap_create(struct ion_platform_heap *heap_data)
>         chunk_heap->heap.ops = &chunk_heap_ops;
>         chunk_heap->heap.type = ION_HEAP_TYPE_CHUNK;
>         chunk_heap->heap.flags = ION_HEAP_FLAG_DEFER_FREE;
> -       pr_info("%s: base %lu size %zu align %ld\n", __func__, chunk_heap->base,
> -               heap_data->size, heap_data->align);
> +       pr_info("%s: base %pa size %zu align %pa\n", __func__,
> +               &chunk_heap->base, heap_data->size, &heap_data->align);
>
>         return &chunk_heap->heap;
>
> --
> Qualcomm Innovation Center, Inc.
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
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