Re: [XEN PATCH 2/2] xen/delay: address MISRA C:2012 Rule 5.3.

[Nicola Vetrini <nicola.vetrini@bugseng.com>]

On 09/08/2023 15:56, Luca Fancellu wrote:
>> On 9 Aug 2023, at 08:55, Nicola Vetrini <nicola.vetrini@bugseng.com> 
>> wrote:
>> 
>> The variable 'msec' declared in the macro shadows the local
>> variable in 'ehci_dbgp_bios_handoff', but to prevent any
>> future clashes with other functions the macro is converted to
>> a static inline function.
>> 
>> No functional change.
>> 
>> Signed-off-by: Nicola Vetrini <nicola.vetrini@bugseng.com>
>> ---
>> xen/include/xen/delay.h | 8 ++++++--
>> 1 file changed, 6 insertions(+), 2 deletions(-)
>> 
>> diff --git a/xen/include/xen/delay.h b/xen/include/xen/delay.h
>> index 9d70ef035f..9150226271 100644
>> --- a/xen/include/xen/delay.h
>> +++ b/xen/include/xen/delay.h
>> @@ -4,7 +4,11 @@
>> /* Copyright (C) 1993 Linus Torvalds */
>> 
>> #include <asm/delay.h>
>> -#define mdelay(n) (\
>> - {unsigned long msec=(n); while (msec--) udelay(1000);})
>> +
>> +static inline void mdelay(unsigned long msec)
>> +{
>> +    while ( msec-- )
> 
> Does misra allows to modify the function parameters? (Truly asking 
> because IDK)
> 

I checked: there's an advisory (R17.8) that disallows this, but since 
advisories (apart from
a couple of selected ones) are not taken into consideration for 
compliance, so it's not a big deal.
Even less so since it's not a pointer type.

-- 
Nicola Vetrini, BSc
Software Engineer, BUGSENG srl (https://bugseng.com)