From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Laurence Rochfort <laurence.rochfort@gmail.com>
Cc: Rob Springer <rspringer@google.com>,
Todd Poynor <toddpoynor@google.com>,
Ben Chan <benchan@chromium.org>,
devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] staging: gasket: Fix sparse "incorrect type in assignment" warnings.
Date: Tue, 9 Oct 2018 15:13:03 +0200 [thread overview]
Message-ID: <20181009131303.GC25423@kroah.com> (raw)
In-Reply-To: <20181004175225.GA22487@minipc.home>
On Thu, Oct 04, 2018 at 06:52:25PM +0100, Laurence Rochfort wrote:
> Silence the below sparse warnings by casting betwen u8 __iomem *, and
> void *.
>
> warning: incorrect type in assignment (different address spaces)
> expected unsigned char [noderef] [usertype] <asn:2>*virt_base
> got void *[assigned] mem
> warning: incorrect type in argument 3 (different address spaces)
> expected void *cpu_addr
> got unsigned char [noderef] [usertype] <asn:2>*virt_base
>
> Signed-off-by: Laurence Rochfort <laurence.rochfort@gmail.com>
> ---
> drivers/staging/gasket/gasket_page_table.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/staging/gasket/gasket_page_table.c b/drivers/staging/gasket/gasket_page_table.c
> index d4c5f8a..7f5e5b3 100644
> --- a/drivers/staging/gasket/gasket_page_table.c
> +++ b/drivers/staging/gasket/gasket_page_table.c
> @@ -1278,7 +1278,7 @@ int gasket_alloc_coherent_memory(struct gasket_dev *gasket_dev, u64 size,
> dma_addr_t *dma_address, u64 index)
> {
> dma_addr_t handle;
> - void *mem;
> + u8 __iomem *mem;
> int j;
> unsigned int num_pages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
> const struct gasket_driver_desc *driver_desc =
> @@ -1290,7 +1290,7 @@ int gasket_alloc_coherent_memory(struct gasket_dev *gasket_dev, u64 size,
> if (num_pages == 0)
> return -EINVAL;
>
> - mem = dma_alloc_coherent(gasket_get_device(gasket_dev),
> + mem = (u8 __iomem *)dma_alloc_coherent(gasket_get_device(gasket_dev),
> num_pages * PAGE_SIZE, &handle, 0);
> if (!mem)
> goto nomem;
> @@ -1325,7 +1325,7 @@ int gasket_alloc_coherent_memory(struct gasket_dev *gasket_dev, u64 size,
> nomem:
> if (mem) {
> dma_free_coherent(gasket_get_device(gasket_dev),
> - num_pages * PAGE_SIZE, mem, handle);
> + num_pages * PAGE_SIZE, (void __force *)mem, handle);
> }
>
> if (gasket_dev->page_table[index]->coherent_pages) {
> @@ -1353,7 +1353,7 @@ int gasket_free_coherent_memory(struct gasket_dev *gasket_dev, u64 size,
> if (gasket_dev->coherent_buffer.length_bytes) {
> dma_free_coherent(gasket_get_device(gasket_dev),
> gasket_dev->coherent_buffer.length_bytes,
> - gasket_dev->coherent_buffer.virt_base,
> + (void __force *)gasket_dev->coherent_buffer.virt_base,
We should not have to "force" anything here. Something feels wrong in
the definition of these variable types...
thanks,
greg k-h
next prev parent reply other threads:[~2018-10-09 13:13 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-04 17:52 [PATCH] staging: gasket: Fix sparse "incorrect type in assignment" warnings Laurence Rochfort
2018-10-09 13:13 ` Greg Kroah-Hartman [this message]
2018-10-10 14:03 ` Laurence Rochfort
2018-10-10 14:25 ` Greg Kroah-Hartman
2018-10-10 21:24 ` [PATCH v3] " Laurence Rochfort
2018-10-15 18:42 ` Todd Poynor
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