linux-kernel - Re: [PATCH v2] lib/Kconfig.debug: Add check for non-constant .{s,u}leb128 support to DWARF5

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Date:   Sun, 16 Oct 2022 17:41:02 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, Palmer Dabbelt <palmer@...belt.com>,
        Conor Dooley <conor@...nel.org>, linux-kbuild@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        patches@...ts.linux.dev, llvm@...ts.linux.dev
Subject: Re: [PATCH v2] lib/Kconfig.debug: Add check for non-constant
 .{s,u}leb128 support to DWARF5

Hi Andrew,

On Sun, Oct 16, 2022 at 05:28:15PM -0700, Andrew Morton wrote:
> On Fri, 14 Oct 2022 13:42:11 -0700 Nathan Chancellor <nathan@...nel.org> wrote:
> 
> > When building with a RISC-V kernel with DWARF5 debug info using clang
> > and the GNU assembler, several instances of the following error appear:
> > 
> >   /tmp/vgettimeofday-48aa35.s:2963: Error: non-constant .uleb128 is not supported
> 
> hm, which kernels want this?
> 
> I could merge it for 6.1, which seems suitable.  If we want it
> backported into earlier kernels then a Fixes: would be nice, to prevent
> it from being ported back further than necessary.

Masahiro took this for 6.1 via the kbuild tree, it is now in mainline as
commit 0a6de78cff60 ("lib/Kconfig.debug: Add check for non-constant
.{s,u}leb128 support to DWARF5"). It does need to go to stable but it
needs a few prerequisite changes to cover all cases and I did not want
to try and describe those dependencies in the patch itself. I should be
able to handle the backports manually tomorrow.

Cheers,
Nathan