On 22/02/17 01:12, Russell King - ARM Linux wrote:
> On Tue, Feb 21, 2017 at 07:10:11PM +0000, James Morse wrote:
>> Hi Tyler,
>>
>> On 15/02/17 19:51, Tyler Baicar wrote:
>>> + } else {
>>> + const void *unknown_err;
>>> +
>>> + unknown_err = acpi_hest_generic_data_payload(gdata);
>>> + printk("%ssection type: %pUl\n", newpfx, sec_type);
>>> + printk("%ssection length: %d\n", newpfx,
>>
>> Nit: please use the "%s""section... that this file consistently uses. This means
>> this code will still work as expected when someone adds '%ss' support to printk!
>
> No. That is wrong:
>
> "%s""section" is stored in memory as bytes containing:
>
> '%' 's' 's' 'e' 'c' 't' 'i' 'o' 'n'
>
> whereas "%ssection" is stored in memory as bytes containing:
>
> '%' 's' 's' 'e' 'c' 't' 'i' 'o' 'n'
>
> They're exactly the same, so when printk() comes to parse the string, it
> sees exactly the same byte sequence. So, the only thing that's happening
> is code obfuscation for no good reason what so ever.
>
> If you don't believe me, run some build tests and look at the resulting
> strings... also look at the C standard. "Adjacent string literal tokens
> are concatenated."
>
> Please get rid of this obfuscation.
Sure, I was always told not do this, clearly I didn't think about it for very long!
This file otherwise consistently uses the now-weird "%s""otherstring" pattern.
Thanks,
James
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