Subject: Re: [PATCH v2 1/2] bpf: don't rely on GCC __attribute__((optimize)) to disable GCSE

From: Segher Boessenkool <[email-masked]>
Date: Thu, 29 Oct 2020 15:31:13 -0500

On Wed, Oct 28, 2020 at 10:57:45PM -0400, Arvind Sankar wrote:
> On Wed, Oct 28, 2020 at 04:20:01PM -0700, Alexei Starovoitov wrote:
> > All compilers have bugs. Kernel has bugs. What can go wrong?

Heh.

> +linux-toolchains. GCC updated the documentation in 7.x to discourage
> people from using the optimize attribute.
> 
> https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=893100c3fa9b3049ce84dcc0c1a839ddc7a21387

https://patchwork.ozlabs.org/project/gcc/patch/20151213081911.GA320@x4/
has all the discussion around that GCC patch.

Segher