Le 24/08/2023 à 14:28, Michael Ellerman a écrit :
> Christophe reported that the change to ARCH_FORCE_MAX_ORDER to limit the
> range to 10 had broken his ability to configure hugepages:
>
> # echo 1 > /sys/kernel/mm/hugepages/hugepages-8192kB/nr_hugepages
> sh: write error: Invalid argument
>
> Several of the powerpc defconfigs previously set the
> ARCH_FORCE_MAX_ORDER value to 12, via the definition in
> arch/powerpc/configs/fsl-emb-nonhw.config, used by:
>
> mpc85xx_defconfig
> mpc85xx_smp_defconfig
> corenet32_smp_defconfig
> corenet64_smp_defconfig
> mpc86xx_defconfig
> mpc86xx_smp_defconfig
>
> Fix it by increasing the allowed range to 12 to restore the previous
> behaviour.
>
> Fixes: 358e526a1648 ("powerpc/mm: Reinstate ARCH_FORCE_MAX_ORDER ranges")
> Reported-by: Christophe Leroy <christophe.le...@csgroup.eu>
> Signed-off-by: Michael Ellerman <m...@ellerman.id.au>
> Link: https://msgid.link/id:8011d806-5b30-bf26-2bfe-a08c39d57...@csgroup.eu
> ---
> arch/powerpc/Kconfig | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> Christophe, can you confirm this fixes your system?
It works, thanks.
Tested-by: Christophe Leroy <christophe.le...@csgroup.eu>
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index c831e20cf40f..8977fa73c09e 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -928,7 +928,7 @@ config ARCH_FORCE_MAX_ORDER
> default "6" if PPC32 && PPC_64K_PAGES
> range 4 10 if PPC32 && PPC_256K_PAGES
> default "4" if PPC32 && PPC_256K_PAGES
> - range 10 10
> + range 10 12
> default "10"
> help
> The kernel page allocator limits the size of maximal physically
