Re: [RFC 1/4] asm-generic/uaccess: don't define inline functions if noinline lib/* in use

[Vineet Gupta]

On 1/14/20 12:57 PM, Arnd Bergmann wrote:
> On Tue, Jan 14, 2020 at 9:08 PM Vineet Gupta <Vineet.Gupta1@xxxxxxxxxxxx> wrote:
>> There are 2 generic varaints of strncpy_from_user() / strnlen_user()
>>  (1). inline version in asm-generic/uaccess.h
>>  (2). optimized word-at-a-time version in lib/*
>>
>> This patch disables #1 if #2 selected. This allows arches to continue
>> reusing asm-generic/uaccess.h for rest of code
>>
>> This came up when switching ARC to generic word-at-a-time interface
>>
>> Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
> This looks like a useful change, but I think we can do even better: It
> seems that
> there are no  callers of __strnlen_user or __strncpy_from_user  in the
> kernel today, so these should not be defined either when the Kconfig symbols
> are set. Also, I would suggest moving the 'extern' declaration for the two
> functions into the #else branch of the conditional so it does not need to be
> duplicated.

Given where things seem to be heading, do u still want an updated patch for this
or do u plan to ditch the inline version in short term anyways.

-Vineet