netdev - Re: [PATCH net-next 4/4] net: ipa: activate some commented assertions

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Message-ID: <7520639c-f08b-cb25-1a62-7e3d69981f95@linaro.org>
Date:   Fri, 19 Mar 2021 07:40:21 -0500
From:   Alex Elder <elder@...aro.org>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     davem@...emloft.net, kuba@...nel.org, bjorn.andersson@...aro.org,
        evgreen@...omium.org, cpratapa@...eaurora.org, elder@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 4/4] net: ipa: activate some commented assertions

On 3/19/21 12:00 AM, Leon Romanovsky wrote:
> On Thu, Mar 18, 2021 at 11:29:23PM -0500, Alex Elder wrote:
>> Convert some commented assertion statements into real calls to
>> ipa_assert().  If the IPA device pointer is available, provide it,
>> otherwise pass NULL for that.
>>
>> There are lots more places to convert, but this serves as an initial
>> verification of the new mechanism.  The assertions here implement
>> both runtime and build-time assertions, both with and without the
>> device pointer.
>>
>> Signed-off-by: Alex Elder <elder@...aro.org>
>> ---
>>   drivers/net/ipa/ipa_reg.h   | 7 ++++---
>>   drivers/net/ipa/ipa_table.c | 5 ++++-
>>   2 files changed, 8 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/net/ipa/ipa_reg.h b/drivers/net/ipa/ipa_reg.h
>> index 732e691e9aa62..d0de85de9f08d 100644
>> --- a/drivers/net/ipa/ipa_reg.h
>> +++ b/drivers/net/ipa/ipa_reg.h
>> @@ -9,6 +9,7 @@
>>   #include <linux/bitfield.h>
>>   
>>   #include "ipa_version.h"
>> +#include "ipa_assert.h"
>>   
>>   struct ipa;
>>   
>> @@ -212,7 +213,7 @@ static inline u32 ipa_reg_bcr_val(enum ipa_version version)
>>   			BCR_HOLB_DROP_L2_IRQ_FMASK |
>>   			BCR_DUAL_TX_FMASK;
>>   
>> -	/* assert(version != IPA_VERSION_4_5); */
>> +	ipa_assert(NULL, version != IPA_VERSION_4_5);
> 
> This assert will fire for IPA_VERSION_4_2, I doubt that this is
> something you want.

No, it will only fail if version == IPA_VERSION_4_5.
The logic of an assertion is the opposite of BUG_ON().
It fails only if the asserted condition yields false.

					-Alex

> 
> Thanks
>