Messages in this thread | | | Date | Mon, 15 Feb 2016 21:02:01 +0100 | From | Andi Kleen <> | Subject | Re: [PATCH 00/33] Compile-time stack metadata validation |
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> > There are two ways to fix the warnings: > > > > 1. get rid of the thunks and call the C functions directly; or > > No. Not until gcc learns about per-function callibg conventions (so that it can > be marked as not clobbering registers).
It does already for static functions in 5.x (with -fipa-ra). And with LTO it can be used even somewhat globally.
Even older version supported it, for only for x86->SSE on 32bit, which is useless for the kernel. But the new IPA-RA propagates which registers are clobbered.
That said it will probably be a long time until we can drop support for older compilers. So for now the manual method is still needed.
-Andi
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