[Bug lto/107014] flatten+lto fails the kernel build

[andi-gcc at firstfloor dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107014

Andi Kleen <andi-gcc at firstfloor dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |andi-gcc at firstfloor dot org

--- Comment #9 from Andi Kleen <andi-gcc at firstfloor dot org> ---
I suspect what happens is that it hits in some kernel initialization function.
If they don't use initcall the LTO build can all inline them into each other
(because they are only called once) creating a single big initialization
function. With flatten that will create an extremely large function that takes
a long time to process.

I suspect any use of flatten is better using always_inline, since that affects
only a single function. Should probably be fixed upstream in the kernel.