Re: [PATCH 1/4] mm: Move ioremap page table mapping function to mm/

[Nicholas Piggin <npiggin@gmail.com>]

Christophe Leroy's on June 19, 2019 11:18 pm:
> 
> 
> Le 19/06/2019 à 05:43, Nicholas Piggin a écrit :
>> Christophe Leroy's on June 11, 2019 3:24 pm:
>>>
>>>
>>> Le 10/06/2019 à 06:38, Nicholas Piggin a écrit :
> 
> [snip]
> 
>>>> diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
>>>> index 51e131245379..812bea5866d6 100644
>>>> --- a/include/linux/vmalloc.h
>>>> +++ b/include/linux/vmalloc.h
>>>> @@ -147,6 +147,9 @@ extern struct vm_struct *find_vm_area(const void *addr);
>>>>    extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
>>>>    			struct page **pages);
>>>>    #ifdef CONFIG_MMU
>>>> +extern int vmap_range(unsigned long addr,
>>>> +		       unsigned long end, phys_addr_t phys_addr, pgprot_t prot,
>>>> +		       unsigned int max_page_shift);
>>>
>>> Drop extern keyword here.
>> 
>> I don't know if I was going crazy but at one point I was getting
>> duplicate symbol errors that were fixed by adding extern somewhere.
> 
> probably not on a function name ...

I know it sounds crazy :P

>>> As checkpatch tells you, 'CHECK:AVOID_EXTERNS: extern prototypes should
>>> be avoided in .h files'
>> 
>> I prefer to follow existing style in surrounding code at the expense
>> of some checkpatch warnings. If somebody later wants to "fix" it
>> that's fine.
> 
> I don't think that's fine to 'fix' later things that could be done right 
> from the begining. 'Cosmetic only' fixes never happen because they are a 
> nightmare for backports, and a shame for 'git blame'.
> 
> In some patches, you add cleanups to make the code look nicer, and here 
> you have the opportunity to make the code nice from the begining and you 
> prefer repeating the errors done in the past ? You're surprising me.

Well I never claimed to be consistent. I actually don't mind the
extern keyword so it's probably just my personal preference that
makes me notice something nearby. I have dropped those "cleanup"
changes though, so there.

Thanks,
Nick