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From:   Michael Ellerman <mpe@ellerman.id.au>
To:     Christophe Leroy <christophe.leroy@c-s.fr>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Oliver O'Halloran <oohall@gmail.com>,
        Segher Boessenkool <segher@kernel.crashing.org>
Cc:     linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 2/4] powerpc/32: activate ARCH_HAS_PMEM_API and ARCH_HAS_UACCESS_FLUSHCACHE
In-Reply-To: <0e779b35cf66fd4aa5ec0ec09fb7820f6c518cb3.1557824379.git.christophe.leroy@c-s.fr>
References: <239d1c8f15b8bedc161a234f9f1a22a07160dbdf.1557824379.git.christophe.leroy@c-s.fr> <0e779b35cf66fd4aa5ec0ec09fb7820f6c518cb3.1557824379.git.christophe.leroy@c-s.fr>
Date:   Mon, 15 Jul 2019 16:49:38 +1000
Message-ID: <87y30z94hp.fsf@concordia.ellerman.id.au>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Christophe Leroy <christophe.leroy@c-s.fr> writes:
> PPC32 also have flush_dcache_range() so it can also support
> ARCH_HAS_PMEM_API and ARCH_HAS_UACCESS_FLUSHCACHE without changes.
>
> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
> ---
>  arch/powerpc/Kconfig | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index d7996cfaceca..cf6e30f637be 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -127,13 +127,13 @@ config PPC
>  	select ARCH_HAS_KCOV
>  	select ARCH_HAS_MMIOWB			if PPC64
>  	select ARCH_HAS_PHYS_TO_DMA
> -	select ARCH_HAS_PMEM_API                if PPC64
> +	select ARCH_HAS_PMEM_API
>  	select ARCH_HAS_PTE_SPECIAL
>  	select ARCH_HAS_MEMBARRIER_CALLBACKS
>  	select ARCH_HAS_SCALED_CPUTIME		if VIRT_CPU_ACCOUNTING_NATIVE && PPC64
>  	select ARCH_HAS_STRICT_KERNEL_RWX	if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
>  	select ARCH_HAS_TICK_BROADCAST		if GENERIC_CLOCKEVENTS_BROADCAST
> -	select ARCH_HAS_UACCESS_FLUSHCACHE	if PPC64
> +	select ARCH_HAS_UACCESS_FLUSHCACHE
>  	select ARCH_HAS_UBSAN_SANITIZE_ALL
>  	select ARCH_HAS_ZONE_DEVICE		if PPC_BOOK3S_64
>  	select ARCH_HAVE_NMI_SAFE_CMPXCHG

This didn't build for me, probably due to something that's changed in
the long period between you posting it and me applying it?

corenet32_smp_defconfig:

  powerpc64-unknown-linux-gnu-ld: lib/iov_iter.o: in function `_copy_from_iter_flushcache':
  powerpc64-unknown-linux-gnu-ld: /scratch/michael/build/maint/build~/../lib/iov_iter.c:825: undefined reference to `memcpy_page_flushcache'
  powerpc64-unknown-linux-gnu-ld: /scratch/michael/build/maint/build~/../lib/iov_iter.c:825: undefined reference to `memcpy_flushcache'
  powerpc64-unknown-linux-gnu-ld: /scratch/michael/build/maint/build~/../lib/iov_iter.c:825: undefined reference to `__copy_from_user_flushcache'
  powerpc64-unknown-linux-gnu-ld: /scratch/michael/build/maint/build~/../lib/iov_iter.c:825: undefined reference to `memcpy_flushcache'

cheers