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SubjectRe: [PATCH 00/17] Implement use of HW assistance on TLB table walk on 8xx

Le 11/05/2018 à 08:48, Michael Ellerman a écrit :
> Christophe Leroy <> writes:
>> The purpose of this serie is to implement hardware assistance for TLB table walk
>> on the 8xx.
>> First part is to make L1 entries and L2 entries independant.
>> For that, we need to alter ioremap functions in order to handle GUARD attribute
>> at the PGD/PMD level.
>> Last part is to try and reuse PTE fragment implemented on PPC64 in order to
>> not waste 16k Pages for page tables as only 4k are used. For the time being,
>> it doesn't work, but I include it in the serie anyway in order to get feedback.
>> Tested successfully on 8xx up to the one before the last.
>> Didn't have time to do compilation test on other configs, I send it anyway
>> before leaving for one week vacation in order to get feedback.
> I replied to a few patches, here's some other build errors:
> arch/powerpc/mm/ioremap.c:135:15: error: '_PAGE_GUARDED' undeclared (first use in this function):
> pseries_defconfig/powerpc
> arch/powerpc/include/asm/book3s/32/pgtable.h:53:19: error: 'PKMAP_BASE' undeclared (first use in this function):
> pmac32_defconfig/powerpc-5.3
> include/linux/mm.h:533:41: error: 'PKMAP_BASE' undeclared (first use in this function):
> pmac32_defconfig/powerpc
> ERROR: "ioremap_bot" [net/netfilter/nf_conntrack.ko] undefined!:
> linkstation_defconfig/powerpc
> ERROR: "ioremap_bot" [fs/xfs/xfs.ko] undefined!:
> linkstation_defconfig/powerpc
> arch/powerpc/include/asm/nohash/32/pgtable.h:80:20: error: 'PKMAP_BASE' undeclared (first use in this function):
> corenet32_smp_defconfig/powerpc-5.3
> arch/powerpc/include/asm/nohash/32/pgalloc.h:64:43: error: '_PMD_GUARDED' undeclared (first use in this function):
> ppc40x_defconfig/powerpc-5.3
> ERROR: "ioremap_bot" [net/packet/af_packet.ko] undefined!:
> storcenter_defconfig/powerpc
> ERROR: "ioremap_bot" [drivers/usb/core/usbcore.ko] undefined!:
> ppc44x_defconfig/powerpc

Thanks for testing. I have now fixed all of them in v2.

For PKMAP_BASE, I had to move it from asm/highmem.h into the
book3s/32/pgtable.h and nohash/32/pgtable.h because including
asm/highmem.h in the pgtable.h files was introducing circular dependency.


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