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From:   Michael Ellerman <patch-notifications@ellerman.id.au>
To:     linux-kernel@vger.kernel.org, Ard Biesheuvel <ardb@kernel.org>
Cc:     Daniel Borkmann <daniel@iogearbox.net>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Paul Mackerras <paulus@samba.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Kees Cook <keescook@chromium.org>,
        Arvind Sankar <nivedita@alum.mit.edu>,
        Peter Zijlstra <peterz@infradead.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Randy Dunlap <rdunlap@infradead.org>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        linuxppc-dev@lists.ozlabs.org
In-Reply-To: <20201028080433.26799-1-ardb@kernel.org>
References: <20201028080433.26799-1-ardb@kernel.org>
Subject: Re: [PATCH] powerpc: avoid broken GCC __attribute__((optimize))
Message-Id: <160630540052.2174375.9307119240987760572.b4-ty@ellerman.id.au>
Date:   Wed, 25 Nov 2020 22:57:41 +1100 (AEDT)
Precedence: bulk

On Wed, 28 Oct 2020 09:04:33 +0100, Ard Biesheuvel wrote:
> Commit 7053f80d9696 ("powerpc/64: Prevent stack protection in early boot")
> introduced a couple of uses of __attribute__((optimize)) with function
> scope, to disable the stack protector in some early boot code.
> 
> Unfortunately, and this is documented in the GCC man pages [0], overriding
> function attributes for optimization is broken, and is only supported for
> debug scenarios, not for production: the problem appears to be that
> setting GCC -f flags using this method will cause it to forget about some
> or all other optimization settings that have been applied.
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc: Avoid broken GCC __attribute__((optimize))
      https://git.kernel.org/powerpc/c/a7223f5bfcaeade4a86d35263493bcda6c940891

cheers