On Wed, Mar 20, 2019 at 11:13 AM Andy Shevchenko
<andriy.shevchenko@xxxxxxxxxxxxxxx> wrote:
>
> After the commit cf65a0f6f6ff
>
> ("dma-mapping: move all DMA mapping code to kernel/dma")
>
> some of the files are referring to outdated information, i.e. old file names
> of DMA mapping sources.
>
> Fix it here.
>
> Cc: Christoph Hellwig <hch@xxxxxx>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> +++ b/arch/ia64/kernel/setup.c
> @@ -256,7 +256,7 @@ __initcall(register_memory);
> * This function checks if the reserved crashkernel is allowed on the specific
> * IA64 machine flavour. Machines without an IO TLB use swiotlb and require
> * some memory below 4 GB (i.e. in 32 bit area), see the implementation of
> - * lib/swiotlb.c. The hpzx1 architecture has an IO TLB but cannot use that
> + * kernel/dma/swiotlb.c. The hpzx1 architecture has an IO TLB but cannot use that
> * in kdump case. See the comment in sba_init() in sba_iommu.c.
Is the point here that just that if you lack an IOTLB and want devices
to be able to reach system memory above 4GB, you need a bounce buffer
below 4GB? If so, maybe we could just say *that* instead of a
nebulous reference to "the implementation of */swiotlb.c", which
doesn't tell you what part of the implementation is relevant.
> diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
> index 5f5302028a9a..7b6dd54018fa 100644
> --- a/arch/x86/kernel/pci-swiotlb.c
> +++ b/arch/x86/kernel/pci-swiotlb.c
> @@ -1,5 +1,5 @@
> // SPDX-License-Identifier: GPL-2.0
> -/* Glue code to lib/swiotlb.c */
> +/* Glue code to kernel/dma/swiotlb.c */
I personally don't think there's much value in this line and I'd
remove it entirely.
> #include <linux/pci.h>
> #include <linux/cache.h>
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index fa57de34776d..1e610ce5992c 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -474,7 +474,7 @@ static int __init reserve_crashkernel_low(void)
> ret = parse_crashkernel_low(boot_command_line, total_low_mem, &low_size, &base);
> if (ret) {
> /*
> - * two parts from lib/swiotlb.c:
> + * two parts from kernel/dma/swiotlb.c:
> * -swiotlb size: user-specified with swiotlb= or default.
> *
> * -swiotlb overflow buffer: now hardcoded to 32k. We round it
Is there any chance this could be updated to refer to some variable or
function names that grep/ctags/cscope/etc could find? If we had that,
I think the filename reference would be superfluous.
> diff --git a/arch/x86/pci/sta2x11-fixup.c b/arch/x86/pci/sta2x11-fixup.c
> index 3cdafea55ab6..1d7f606c59d9 100644
> --- a/arch/x86/pci/sta2x11-fixup.c
> +++ b/arch/x86/pci/sta2x11-fixup.c
> @@ -1,6 +1,6 @@
> /*
> * arch/x86/pci/sta2x11-fixup.c
> - * glue code for lib/swiotlb.c and DMA translation between STA2x11
> + * glue code for kernel/dma/swiotlb.c and DMA translation between STA2x11
I think both of these lines (the "arch/x86/pci/sta2x11-fixup.c" one
and the "glue code" one) are superfluous.
There's also a superfluous empty line at the end of the GPL license
text, but I guess that should be removed by replacing the whole thing
with an SPDX line.
> * AMBA memory mapping and the X86 memory mapping
> *
> * ST Microelectronics ConneXt (STA2X11/STA2X10)
> --
> 2.20.1
>
