On Mon, 23 Jun 2014 06:41:29 -0700 Joe Perches <joe@xxxxxxxxxxx> wrote:
> Add this helper for consistency with pci_zalloc_coherent
> and the ability to remove unnecessary memset(,0,) uses.
While we're being anal.. I'm not a big fan of the patch titles. Worst
is "amd: Use pci_zalloc_consistent". "amd" is quite a poor identifier
- it's only when you get in and look at the diff that you realise it's
an ethernet driver.
People sometimes address this by using
"drivers: net: ethernet: amd: use pci_zalloc_consistent"
which strikes me as utterly perverse. We already have a nice way of
representing the hierarchy and that's using '/'.
So when the irritation gets too high and when I can be bothered I'll
rewrite things like that to
"drivers/net/ethernet/amd: use pci_zalloc_consistent"
which strikes me as being blindingly obvious, but apparently I'm in a
small minority :(
> --- a/include/asm-generic/pci-dma-compat.h
> +++ b/include/asm-generic/pci-dma-compat.h
> @@ -19,6 +19,14 @@ pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
> return dma_alloc_coherent(hwdev == NULL ? NULL : &hwdev->dev, size, dma_handle, GFP_ATOMIC);
> }
>
> +static inline void *
> +pci_zalloc_consistent(struct pci_dev *hwdev, size_t size,
> + dma_addr_t *dma_handle)
> +{
> + return dma_zalloc_coherent(hwdev == NULL ? NULL : &hwdev->dev,
> + size, dma_handle, GFP_ATOMIC);
> +}
> +
We'd get a smaller kernel by uninlining this. It is hardly
performance-sensitive. Uninlining would presumably use more stack,
but GFP_ATOMIC won't use a ton of stack anyway.
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