> From: Prarit Bhargava <prarit@xxxxxxxxxx>
>
> The internal make command 'make rh-brew'/'make dist-brew' is failing with
>
> Processing /home/prarit/git-kernel/kernel-ark/redhat/configs/kernel-aarch64-debug-fedora.config ... Error: Mismatches found in configuration files
> Found CONFIG_FORCE_MAX_ZONEORDER=11 after generation, had CONFIG_FORCE_MAX_ZONEORDER=13 in Source tree
>
> ARK commit f5ca593e1c2e ("configs: Adjust CONFIG_FORCE_MAX_ZONEORDER for
> Fedora") set this to 11, and follow-on ARK commit dd028d261347 ("[redhat]
> Sync up ARK's Fedora config tree with Fedora's dist-git") erroneously
> overwrote the value back to 13.
>
> Set CONFIG_FORCE_MAX_ZONEORDER back to 11 for aarch64.
For reference the reason we have this disparity goes back to why
Fedora doesn't have 64K page sizes for aarch64. The reason is because
with 64K pages it makes CMA 512Mb rather than the 64Mb (which I think
can actually be 16) we have with 4K pages. I seem to remember its
something to do with CMA using large pages and with 64K page sizes
that makes the smallest large page to be 512Mb.
Losing 512Mb is obviously fatal on devices with small amounts of RAM
like a bunch of the SBCs we support on Fedora so to support SBCs we
had to move to 4K pages until we got a proper fix for this. Related it
actually also affects RHEL for things like AWS images with small
amounts of memory so I suspect it would be useful to be fixed in the
RHEL use case too.
Peter
> Fixes: dd028d261347 ("[redhat] Sync up ARK's Fedora config tree with Fedora's dist-git")
> Signed-off-by: Prarit Bhargava <prarit@xxxxxxxxxx>
> Cc: honli@xxxxxxxxxx
> Cc: jcline@xxxxxxxxxx
> ---
> .../fedora/generic/arm/aarch64/CONFIG_FORCE_MAX_ZONEORDER | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/redhat/configs/fedora/generic/arm/aarch64/CONFIG_FORCE_MAX_ZONEORDER b/redhat/configs/fedora/generic/arm/aarch64/CONFIG_FORCE_MAX_ZONEORDER
> index b730690db048..8220d67904ea 100644
> --- a/redhat/configs/fedora/generic/arm/aarch64/CONFIG_FORCE_MAX_ZONEORDER
> +++ b/redhat/configs/fedora/generic/arm/aarch64/CONFIG_FORCE_MAX_ZONEORDER
> @@ -1,4 +1,4 @@
> # We technically want this to be 13 for Fedora with 4K pages but that's only
> # an option with an out of tree patch. Keep this 11 for compatibility until
> # we figure out what we want here
> -CONFIG_FORCE_MAX_ZONEORDER=13
> +CONFIG_FORCE_MAX_ZONEORDER=11
> --
> 2.26.2
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