linux-kernel - Re: [PATCH] x86_64: fix jiffies ODR violation

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Message-ID: <20200519031742.GB499505@tassilo.jf.intel.com>
Date:   Mon, 18 May 2020 20:17:42 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Bob Haarman <inglorion@...gle.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Fangrui Song <maskray@...gle.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        stable@...r.kernel.org,
        Nathan Chancellor <natechancellor@...il.com>,
        Alistair Delva <adelva@...gle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Kyung Min Park <kyung.min.park@...el.com>,
        afzal mohammed <afzal.mohd.ma@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Baoquan He <bhe@...hat.com>,
        Thomas Lendacky <Thomas.Lendacky@....com>,
        Ross Zwisler <zwisler@...omium.org>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH] x86_64: fix jiffies ODR violation

> Instead, we can avoid the ODR violation by matching other arch's by
> defining jiffies only by linker script.  For -fno-semantic-interposition
> + Full LTO, there is no longer a global definition of jiffies for the
> compiler to produce a local symbol which the linker script won't ensure
> aliases to jiffies_64.

I guess it was an historical accident.

Reviewed-by: Andi Kleen <ak@...ux.intel.com>