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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Tue, 7 Sep 2021 10:33:40 -0700
Message-ID: <CAHk-=wh37UWTqUzbh5qg_x9pFgqBVwpdq_Kf+hnB5mqEUkrjmg@mail.gmail.com>
Subject: Re: [PATCH] Enable '-Werror' by default for all kernel builds
To:     Arnd Bergmann <arnd@kernel.org>,
        Harry Wentland <harry.wentland@amd.com>,
        Leo Li <sunpeng.li@amd.com>,
        Alex Deucher <alexander.deucher@amd.com>,
        =?UTF-8?Q?Christian_K=C3=B6nig?= <christian.koenig@amd.com>,
        "Pan, Xinhui" <Xinhui.Pan@amd.com>
Cc:     Nathan Chancellor <nathan@kernel.org>,
        Guenter Roeck <linux@roeck-us.net>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        llvm@lists.linux.dev, Nick Desaulniers <ndesaulniers@google.com>,
        amd-gfx@lists.freedesktop.org
Content-Type: multipart/mixed; boundary="00000000000099af8605cb6b2b32"
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--00000000000099af8605cb6b2b32
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On Tue, Sep 7, 2021 at 10:10 AM Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> Do I know why? No. I do note that that code is disgusting.
>
> It's passing one of those structs around by value, for example. That's
> a 72-byte structure that is copied on the stack due to stupid calling
> conventions. Maybe clang generates a few extra temporaries for it as
> part of the function call stack setup? Who knows..

Ooh, yes.

This attached patch is crap - it converts the helper functions to use
const pointers instead of passing the whole structure, but it then
only converts that one file that *uses* them.

So the end result will not compile in general, but you can do

    make drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn30/display_rq_dlg_calc_30.o

and it compiles for me.

And while gcc doesn't care that much - it will apparently either
generate the argument stack every call - clang cares deeply.

The nasty 720-byte stack frame that clang generates turns into just a
320-byte one, and code generation in general looks a *lot* better.

Now, as mentioned, this patch is broken and incomplete. But I really
think the AMD GPU people need to do this. It makes those functions go
from practically unusable to not horribly disgusting.

So Harry/Leo/Alex/Christian and amd-gfx list - can you look into
making this ugly "make one file compile better" patch actually work
properly?

It *looks* lto me ike that code was perhaps written for a C++ compiler
and the helpers have been written as a "pass by reference", and the
arguments used to be

     const display_data_rq_misc_params_st& rq_misc_param

and then the compiler will pass the argument as a pointer. And then it
was converted to C, and the "pass by reference" in the function
declaration was turned into "pass by value", to avoid changing "." to
"->" in the use.

But a '&arg' thing in C++ really is a '*arg' pointer in C, and should
have been done as that.

Of course, it's also possible that that code was simply written by
somebody who didn't understand just *how* horrible it is to pass
structures bigger than a word or two by value.

Do we have a compiler warning for passing big structures by value?

                   Linus

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