I forgot to add a junk to the text.
v4:
NOTES
Unless you need the finer grained control that this system
call provides, you probably want to use the GCC built-in
function __builtin___clear_cache(), which provides a portable
interface across platforms supported by GCC and compatible
compilers:
//Maybe 'and compatible compilers' is redundant and I should remove it?
void __builtin___clear_cache(void *begin, void *end);
On platforms that don't require instruction cache flushes,
__builtin___clear_cache() has no effect.
Note: On some GCC-compatible compilers, such as clang, the
prototype for this function uses char * instead of void *.
On 12/11/20 7:22 PM, Alejandro Colomar (man-pages) wrote:
> Hi all,
>
> Please review this text:
>
> [
> NOTES
> Unless you need the finer grained control that this system
> call provides, you probably want to use the GCC built-in
> function __builtin___clear_cache(), which provides a more
> portable interface:
>
> void __builtin___clear_cache(void *begin, void *end);
>
> On platforms that don't require instruction cache flushes,
> __builtin___clear_cache() has no effect.
>
> Note: On some GCC-compatible compilers, such as clang, the
> prototype for this function uses char * instead of void *.
> ]
>
> Thanks,
>
> Alex
>
> On 12/11/20 7:02 PM, Alejandro Colomar (man-pages) wrote:
>> Hi Michael,
>>
>> On 12/11/20 9:15 AM, Michael Kerrisk (man-pages) wrote:
>>> i Alex,
>>>
>>> On 12/10/20 9:56 PM, Alejandro Colomar (man-pages) wrote:
>>>> Hi all,
>>>>
>>>> v2:
>>>>
>>>> [
>>>> NOTES
>>>> Unless you need the finer grained control that this system
>>>> call provides, you probably want to use the GCC built-in
>>>> function __builtin___clear_cache(), which provides a more
>>>> portable interface:
>>>>
>>>> void __builtin___clear_cache(void *begin, void *end);
>>>> ]
>>>
>>> This seems a reasonable text to me, but I think it would be helpful
>>> to say a little more precisely what kind of portability we are
>>> talking about here.
>> Sure.
>>
>>>
>>> Greater ortability across Linux architectures? Greater portability
>>> across platforms supported by GCC (including non-Linux) platforms?
>>> Something else?
>>
>> '... which provides a portable interface across platforms supported by
>> GCC:' sounds good.
>>
>> Maybe GCC devs have something more to add.
>
>>
>> Thanks,
>>
>> Alex
>>
>>>
>>> Thanks,
>>>
>>> Michael
>>>
>>>
>>
>
--
Alejandro Colomar
Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/
http://www.alejandro-colomar.es
