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Subject: Re: [PATCH 1/2] HMM: test: fix CONFIG_DEVICE_PRIVATE dependencies
To:     Arnd Bergmann <arnd@arndb.de>, Jason Gunthorpe <jgg@ziepe.ca>,
        =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= <jglisse@redhat.com>
CC:     Jason Gunthorpe <jgg@mellanox.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Masahiro Yamada <masahiroy@kernel.org>,
        Changbin Du <changbin.du@intel.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        Anshuman Khandual <anshuman.khandual@arm.com>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        <linux-kernel@vger.kernel.org>
References: <20200508144017.3501418-1-arnd@arndb.de>
From:   Ralph Campbell <rcampbell@nvidia.com>
Message-ID: <913026fd-1911-55dd-823c-b11bce9b2f37@nvidia.com>
Date:   Fri, 8 May 2020 10:00:18 -0700
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On 5/8/20 7:40 AM, Arnd Bergmann wrote:
> One cannot select DEVICE_PRIVATE when its dependencies are disabled:
> 
> WARNING: unmet direct dependencies detected for DEVICE_PRIVATE
>    Depends on [n]: ZONE_DEVICE [=n]
>    Selected by [m]:
>    - TEST_HMM [=m] && RUNTIME_TESTING_MENU [=y] && TRANSPARENT_HUGEPAGE [=y]
> lib/test_hmm.c:480:8: error: implicit declaration of function 'memremap_pages' [-Werror,-Wimplicit-function-declaration]
>          ptr = memremap_pages(&devmem->pagemap, numa_node_id());
>                ^
> lib/test_hmm.c:480:8: note: did you mean 'memcmp_pages'?
> include/linux/mm.h:3082:12: note: 'memcmp_pages' declared here
> extern int memcmp_pages(struct page *page1, struct page *page2);
>             ^
> lib/test_hmm.c:480:6: error: incompatible integer to pointer conversion assigning to 'void *' from 'int' [-Werror,-Wint-conversion]
>          ptr = memremap_pages(&devmem->pagemap, numa_node_id());
>              ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> lib/test_hmm.c:1089:4: error: implicit declaration of function 'memunmap_pages' [-Werror,-Wimplicit-function-declaration]
>                          memunmap_pages(&devmem->pagemap);
> 
> Add a dependency from CONFIG_TEST_HMM to ZONE_DEVICE, to disallow
> those broken configurations.

Thanks for fixing this.

> 
> Fixes: 5d5e54be8a1e ("mm/hmm/test: add selftest driver for HMM")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Since the HMM tests are not yet in Linus' tree, shouldn't this patch just be folded
into Jason's hmm tree instead of a Fixes: line?

Reviewed-by: Ralph Campbell <rcampbell@nvidia.com>

> ---
>   lib/Kconfig.debug | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index d9885fa37cc0..63667d62c9d8 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -2262,6 +2262,7 @@ config TEST_MEMINIT
>   config TEST_HMM
>   	tristate "Test HMM (Heterogeneous Memory Management)"
>   	depends on TRANSPARENT_HUGEPAGE
> +	depends on ZONE_DEVICE
>   	select DEVICE_PRIVATE
>   	select HMM_MIRROR
>   	select MMU_NOTIFIER
>