Re: [Xen-devel] [PATCH 4/4] sched: Use the auto-generated list of schedulers

[Jonathan Creekmore <jonathan.creekmore@xxxxxxxxx>]

> On Dec 18, 2015, at 10:43 AM, Jan Beulich <jbeulich@xxxxxxxx> wrote:
> 
>>>> On 18.12.15 at 17:00, <jonathan.creekmore@xxxxxxxxx> wrote:
>> Jan Beulich writes:
>>>>>> On 17.12.15 at 21:59, <jonathan.creekmore@xxxxxxxxx> wrote:
>>>> +extern const struct scheduler *__schedulers_start[], *__schedulers_end[];
>>>> +#define NUM_SCHEDULERS 
>> (((uintptr_t)__schedulers_end-(uintptr_t)__schedulers_start) \
>>>> +                        / sizeof(struct scheduler *))
>>>> +static const struct scheduler **schedulers = __schedulers_start;
>>> 
>>> I really wonder whether we should continue follow this route of
>>> __start_ / __stop_ symbols, instead of leveraging gas+ld's
>>> .startof. and .sizeof. operators.
>> 
>> So, I would love to explore using those operators if you can give me
>> some link to documentation for using them. I have yet to be able to find
>> a construct for LD and GCC that works correctly for generating
>> equivalent symbols.
> 
> With binutils docs missing any notion of these, I can only refer
> you to binutils sources, I'm afraid.
> 

Well, I would prefer not to delve into undocumented behavior in what
should be a fairly straightforward patch set, so I plan on keeping the use
of the __start and __stop symbols.


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