linux-kernel - Re: [PATCH] crypto: cavium: fix Kconfig dependencies

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Date:   Tue, 14 Feb 2017 10:26:52 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     David Daney <ddaney@...iumnetworks.com>,
        Arnd Bergmann <arnd@...db.de>,
        George Cherian <george.cherian@...ium.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
Cc:     David Daney <david.daney@...ium.com>, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: cavium: fix Kconfig dependencies

On 02/14/17 09:09, David Daney wrote:
> On 02/14/2017 09:07 AM, Arnd Bergmann wrote:
>> The driver fails to build if MSI support is disabled:
>>
>> In file included from /git/arm-soc/drivers/crypto/cavium/cpt/cptpf_main.c:18:0:
>> drivers/crypto/cavium/cpt/cptpf.h:57:20: error: array type has incomplete element type 'struct msix_entry'
>>   struct msix_entry msix_entries[CPT_PF_MSIX_VECTORS];
>>                     ^~~~~~~~~~~~
>> drivers/crypto/cavium/cpt/cptpf_main.c: In function 'cpt_enable_msix':
>> drivers/crypto/cavium/cpt/cptpf_main.c:344:8: error: implicit declaration of function 'pci_enable_msix';did you mean 'cpt_enable_msix'? [-Werror=implicit-function-declaration]
>>
>> On the other hand, it doesn't seem to have any build dependency on ARCH_THUNDER,
>> so let's allow compile-testing to catch this kind of problem more easily.
>> The 64-bit dependency is needed for the use of readq/writeq.
>>
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>> ---
>>  drivers/crypto/cavium/cpt/Kconfig | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/crypto/cavium/cpt/Kconfig b/drivers/crypto/cavium/cpt/Kconfig
>> index 247f1cbbefc1..cbd51b1aa046 100644
>> --- a/drivers/crypto/cavium/cpt/Kconfig
>> +++ b/drivers/crypto/cavium/cpt/Kconfig
>> @@ -7,7 +7,8 @@ config CRYPTO_DEV_CPT
>>
>>  config CAVIUM_CPT
>>      tristate "Cavium Cryptographic Accelerator driver"
>> -    depends on ARCH_THUNDER
>> +    depends on ARCH_THUNDER || COMPILE_TEST
>> +    depends on PCI_MSI && 64BIT
> 
> 
> Perhaps we should select PCI and PCI_MSI instead.
> 
> These systems cannot function without those.

Then the "depends" (and hence the patch) is correct.

A driver should not enable all of PCI if it is disabled
for some other reason.

>>      select CRYPTO_DEV_CPT
>>      help
>>        Support for Cavium CPT block found in octeon-tx series of
>>
> 


-- 
~Randy