Re: [PATCH v2 2/2] staging: ion: chunk_heap: use %pad for printing dma_addr_t's

Dan Carpenter
2015-05-04T08:23:08Z

On Thu, Apr 09, 2015 at 06:10:04PM -0700, Mitchel Humpherys 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 %pad as instructed in printk-formats.txt.
>
> Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>

This one was just merged and I was about to email you that it introduces
some new Smatch warnings, but actually looking at it, it's just wrong.

We want to print "chunk_heap->base" and not "&chunk_heap->base".

And anyway "&chunk_heap->base" is a regular pointer, not a dma_addr_t.

So please send a new patch that removes the &.

regards,
dan carpenter

> ---
> 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 54746157d799..6b3e18aa1c64 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_debug("%s: base %lu size %zu align %ld\n", __func__, chunk_heap->base,
> - heap_data->size, heap_data->align);
> + pr_debug("%s: base %pad size %zu align %pad\n", __func__,
> + &chunk_heap->base, heap_data->size, &heap_data->align);
>
> return &chunk_heap->heap;
>
> --
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