linux-kernel - Re: [PATCH] arm64: make atomic helpers __always

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Date:   Fri, 8 Jan 2021 11:26:53 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Will Deacon <will@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] arm64: make atomic helpers __always_inline

On Fri, Jan 8, 2021 at 10:33 AM Will Deacon <will@...nel.org> wrote:
> On Fri, Jan 08, 2021 at 10:19:56AM +0100, Arnd Bergmann wrote:
> > From: Arnd Bergmann <arnd@...db.de>
> >
> > With UBSAN enabled and building with clang, there are occasionally
> > warnings like
> >
> > WARNING: modpost: vmlinux.o(.text+0xc533ec): Section mismatch in reference from the function arch_atomic64_or() to the variable .init.data:numa_nodes_parsed
> > The function arch_atomic64_or() references
> > the variable __initdata numa_nodes_parsed.
> > This is often because arch_atomic64_or lacks a __initdata
> > annotation or the annotation of numa_nodes_parsed is wrong.
> >
> > for functions that end up not being inlined as intended but operating
> > on __initdata variables. Mark these as __always_inline, along with
> > the corresponding asm-generic wrappers.
>
> Hmm, I don't fully grok this. Why does it matter if a non '__init' function
> is called with a pointer to some '__initdata'? Or is the reference coming
> from somewhere else? (where?).

There are (at least) three ways for gcc to deal with a 'static inline'
function:

a) fully inline it as the __always_inline attribute does
b) not inline it at all, treating it as a regular static function
c) create a specialized version with different calling conventions

In this case, clang goes with option c when it notices that all
callers pass the same constant pointer. This means we have a
synthetic

static noinline long arch_atomic64_or(long i)
{
        return __lse_ll_sc_body(atomic64_fetch_or, i, &numa_nodes_parsed);
}

which is a few bytes shorter than option b as it saves a load in the
caller. This function definition however violates the kernel's rules
for section references, as the synthetic version is not marked __init.

      Arnd