ACK/Cmnt: [SRU][AWS-{B,F,G}] enable PCI write-combine for arm64

[Stefan Bader]

On 02.09.20 16:50, Kamal Mostafa wrote:
> BugLink: https://bugs.launchpad.net/bugs/1893817
> 
> To improve PCI performance on arm64 AWS instances, enable arch_can_pci_mmap_wc()
> via the patch:
> 
>   From: Clint Sbisa <csbisa at amazon.com>
>   Subject: [PATCH] arm64: Enable PCI write-combine resources under sysfs
> 
>   https://lore.kernel.org/linux-pci/20200831151827.pumm2p54fyj7fz5s@amazon.com/
> 
> 
> Supplied here are two versions of this one-liner patch:
>     [PATCH][AWS-B]       <--  for linux-aws/bionic master (v4.15)
>     [PATCH][AWS-{F,G}]   <--  for linux-aws/{focal and groovy} master
> 
> I have smoke-tested this on AWS ARM instances.
> 
>  -Kamal
> 
> -----
> 
> Clint Sbisa (1):
>   UBUNTU: SAUCE: arm64: Enable PCI write-combine resources under sysfs
> 
>  arch/arm64/include/asm/pci.h | 1 +
>  1 file changed, 1 insertion(+)
> 
The bug report should have a SRU Template[1] in the description. I also set the
importance to medium as it sounds this is impairing functionality. Initially I
thought low as enabling sounded like turning on some option only.

[1] https://wiki.ubuntu.com/StableReleaseUpdates/#SRU_Bug_Template

If fixed:

Acked-by: Stefan Bader <stefan.bader at canonical.com>

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