Re: [PATCH RFC tip/core/rcu 5/6] rcu: Make __kfree_rcu() lessdependent on compiler choices

[Jan Engelhardt]

On Thursday 2012-04-26 14:48, Peter Zijlstra wrote:
>On Mon, 2012-04-23 at 09:42 -0700, Paul E. McKenney wrote:
>> Currently, __kfree_rcu() is implemented as an inline function, and
>> contains a BUILD_BUG_ON() that malfunctions if __kfree_rcu() is compiled
>> as an out-of-line function.  Unfortunately, there are compiler settings
>> (e.g., -O0) that can result in __kfree_rcu() being compiled out of line,
>> resulting in annoying build breakage.  This commit therefore converts
>> both __kfree_rcu() and __is_kfree_rcu_offset() from inline functions to
>> macros to prevent such misbehavior on the part of the compiler.
>
>The kernel very explicitly doesn't support being compiled with -O0, so
>this is a non-issue, I think you can make it work if you add
>-finline-functions.
>
>I'd drop this, either make the entire kernel compile or don't bother.

It was not originally meant to make the entire kernel compile with -O0,
but only select modules/.c files.
That, or __always_inline just does not always inline.

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