linux-kernel - Re: [PATCH v5 2/9] bitops: always define asm-generic non-atomic bitops

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Date:   Mon,  2 Jan 2023 17:30:59 +0100
From:   Alexander Lobakin <alexandr.lobakin@...el.com>
To:     Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Cc:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        Arnd Bergmann <arnd@...db.de>,
        Yury Norov <yury.norov@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Matt Turner <mattst88@...il.com>,
        Brian Cain <bcain@...cinc.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "David S. Miller" <davem@...emloft.net>,
        Kees Cook <keescook@...omium.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Marco Elver <elver@...gle.com>, Borislav Petkov <bp@...e.de>,
        Tony Luck <tony.luck@...el.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, kernel test robot <lkp@...el.com>,
        linux-alpha@...r.kernel.org, linux-hexagon@...r.kernel.org,
        linux-ia64@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-arch@...r.kernel.org, llvm@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/9] bitops: always define asm-generic non-atomic bitops

From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Date: Mon, 2 Jan 2023 17:14:31 +0100

> On Fri, Jun 24, 2022 at 02:13:06PM +0200, Alexander Lobakin wrote:
> > Move generic non-atomic bitops from the asm-generic header which
> > gets included only when there are no architecture-specific
> > alternatives, to a separate independent file to make them always
> > available.
> > Almost no actual code changes, only one comment added to
> > generic_test_bit() saying that it's an atomic operation itself
> > and thus `volatile` must always stay there with no cast-aways.
> > 
> > Suggested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> # comment
> > Suggested-by: Marco Elver <elver@...gle.com> # reference to kernel-doc
> > Signed-off-by: Alexander Lobakin <alexandr.lobakin@...el.com>
> > Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > Reviewed-by: Marco Elver <elver@...gle.com>
> > ---
> >  .../asm-generic/bitops/generic-non-atomic.h   | 130 ++++++++++++++++++
> >  include/asm-generic/bitops/non-atomic.h       | 110 ++-------------
> >  2 files changed, 138 insertions(+), 102 deletions(-)
> >  create mode 100644 include/asm-generic/bitops/generic-non-atomic.h
> > 
> 
> Hi,
> 
> this patch gives me a headache when trying to run sparse against a module.
> 
> Olek please help :D

It was fixed shortly after the build bots turned on on the original
series with [0]. Hovewer, no release tag's been made after the fix.
There's also a short discussion regarding packaging Sparse 0.6.4 for
Debian with that fix cherry-picked[1], not sure if it led anywhere.

> 
> $ sudo make C=2 -C . M=drivers/net/ethernet/intel/ice/
> make: Entering directory '/home/mfijalko/bpf-next'
>   CHECK   drivers/net/ethernet/intel/ice/ice_main.c
> drivers/net/ethernet/intel/ice/ice_main.c: note: in included file (through include/linux/bitops.h, include/linux/kernel.h, drivers/net/ethernet/intel/ice/ice.h):
> ./arch/x86/include/asm/bitops.h:66:1: warning: unreplaced symbol 'return'

[...]

> drivers/net/ethernet/intel/ice/ice_main.c: note: in included file (through arch/x86/include/asm/bitops.h, include/linux/bitops.h, include/linux/kernel.h, drivers/net/ethernet/intel/ice/ice.h):
> ./include/asm-generic/bitops/instrumented-non-atomic.h:142:9: warning: unreplaced symbol 'return'
> ./include/asm-generic/bitops/instrumented-non-atomic.h:139:1: warning: unreplaced symbol 'return'
> 
> that's for a single file, there's no point in including same output for
> every other file being checked.
> 
> Thanks,
> Maciej

[0] https://git.kernel.org/pub/scm/devel/sparse/sparse.git/commit/?id=0e1aae55e49cad7ea43848af5b58ff0f57e7af99
[1] https://lore.kernel.org/all/Yr7kPM1wLZnOqxOA@smile.fi.intel.com

Thanks,
Olek