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

[PATCH v2 0/2] get rid of GCC __attribute__((optimize)) for BPF · Ard Biesheuvel <ardb@kernel.org> · 2020-10-29
[PATCH v2 2/2] bpf: move interpreter into separate source file · Ard Biesheuvel <ardb@kernel.org> · 2020-10-28
[PATCH v2 1/2] bpf: don't rely on GCC __attribute__((optimize)) to disable GCSE · Ard Biesheuvel <ardb@kernel.org> · 2020-10-28
Re: [PATCH v2 1/2] bpf: don't rely on GCC __attribute__((optimize)) to disable GCSE · Alexei Starovoitov <hidden> · 2020-10-28
Re: [PATCH v2 1/2] bpf: don't rely on GCC __attribute__((optimize)) to disable GCSE · Ard Biesheuvel <ardb@kernel.org> · 2020-10-28
Re: [PATCH v2 1/2] bpf: don't rely on GCC __attribute__((optimize)) to disable GCSE · Alexei Starovoitov <hidden> · 2020-10-28
Re: [PATCH v2 1/2] bpf: don't rely on GCC __attribute__((optimize)) to disable GCSE · Ard Biesheuvel <ardb@kernel.org> · 2020-10-28
Re: [PATCH v2 1/2] bpf: don't rely on GCC __attribute__((optimize)) to disable GCSE · Alexei Starovoitov <hidden> · 2020-10-28
Re: [PATCH v2 1/2] bpf: don't rely on GCC __attribute__((optimize)) to disable GCSE · Arvind Sankar <hidden> · 2020-10-29
Re: [PATCH v2 1/2] bpf: don't rely on GCC __attribute__((optimize)) to disable GCSE · Segher Boessenkool <hidden> · 2020-10-29
Re: [PATCH v2 1/2] bpf: don't rely on GCC __attribute__((optimize)) to disable GCSE · Ard Biesheuvel <ardb@kernel.org> · 2020-10-29
Re: [PATCH v2 1/2] bpf: don't rely on GCC __attribute__((optimize)) to disable GCSE · Nick Desaulniers <hidden> · 2020-10-30
Re: [PATCH v2 1/2] bpf: don't rely on GCC __attribute__((optimize)) to disable GCSE · Alexei Starovoitov <hidden> · 2020-10-30
Re: [PATCH v2 1/2] bpf: don't rely on GCC __attribute__((optimize)) to disable GCSE · Ard Biesheuvel <ardb@kernel.org> · 2020-10-30
Re: [PATCH v2 1/2] bpf: don't rely on GCC __attribute__((optimize)) to disable GCSE · Geert Uytterhoeven <geert@linux-m68k.org> · 2020-10-29
Re: [PATCH v2 1/2] bpf: don't rely on GCC __attribute__((optimize)) to disable GCSE · Nick Desaulniers <hidden> · 2020-10-30

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

From: Segher Boessenkool <hidden>
Date: 2020-10-29 20:41:08
Also in: bpf, linux-toolchains, lkml

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:

quoted

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

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