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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Fri, 2 Sep 2022 11:08:54 -0700
Message-ID: <CAHk-=wjRLehUO=u8HDJGRFv+wz7hakSc=z6eTg547pAmb0UKHg@mail.gmail.com>
Subject: Re: [PATCH v2 08/59] x86/build: Ensure proper function alignment
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org,
        x86@kernel.org, Tim Chen <tim.c.chen@linux.intel.com>,
        Josh Poimboeuf <jpoimboe@kernel.org>,
        Andrew Cooper <Andrew.Cooper3@citrix.com>,
        Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
        Johannes Wikner <kwikner@ethz.ch>,
        Alyssa Milburn <alyssa.milburn@linux.intel.com>,
        Jann Horn <jannh@google.com>, "H.J. Lu" <hjl.tools@gmail.com>,
        Joao Moreira <joao.moreira@intel.com>,
        Joseph Nuzman <joseph.nuzman@intel.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Juergen Gross <jgross@suse.com>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        K Prateek Nayak <kprateek.nayak@amd.com>,
        Eric Dumazet <edumazet@google.com>
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On Fri, Sep 2, 2022 at 10:32 AM Peter Zijlstra <peterz@infradead.org> wrote:
>
> There is a DEBUG case that increases the thing to 32.

Well, but that should be part of the Kconfig rules too.

In fact, I think that argues for moving that FUNCTION_ALIGNMENT into
the generic Kconfig, since we already have that much hackier debug
thing there.

That would then get rid of the conditional in asm-generic too, and get
rid of the horrid hack in the main Makefile as well.

I love how commit cf536e185869 ("Makefile: extend 32B aligned debug
option to 64B aligned") took that previous random debug entry and just
made it 64B instead of 32B. What a crock that all is.

Let's just do this right.

             Linus


               Linus