From: Mark Rutland <mark.rutland@arm.com>
To: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
x86@kernel.org, jpoimboe@redhat.com,
linux-kernel@vger.kernel.org, elver@google.com,
jbaron@akamai.com, rostedt@goodmis.org, ardb@kernel.org
Subject: Re: [PATCH 7/7] context_tracking: Always inline empty stubs
Date: Thu, 26 May 2022 16:26:13 +0100 [thread overview]
Message-ID: <Yo+cFQkX9fVTOmrv@FVFF77S0Q05N.cambridge.arm.com> (raw)
In-Reply-To: <20220526151654.k3mxzp5so25we7y3@treble>
On Thu, May 26, 2022 at 08:16:54AM -0700, Josh Poimboeuf wrote:
> On Thu, May 26, 2022 at 04:10:52PM +0100, Mark Rutland wrote:
> > On Thu, May 26, 2022 at 08:02:06AM -0700, Josh Poimboeuf wrote:
> > > On Thu, May 26, 2022 at 12:52:59PM +0200, Peter Zijlstra wrote:
> > > > Because GCC is seriously challenged..
> > >
> > > Or are these CONFIG_DEBUG_SECTION_MISMATCH?
> >
> > Does it matter?
>
> Yes, because I believe the only thing this option is good for is
> creating a bunch of useless '__always_inline' patches:
>
> https://lore.kernel.org/all/7fad83ecde03540e65677959034315f8fbb3755e.1649434832.git.jpoimboe@redhat.com/
Sure, but as I said, there are other reasons why the compiler can generate code
in this way, even if that's unlikely. Without `__always_inline` we don't
actually have a guarantee of inlining, so those warning *is* legitimate, even
if 99.99% of the time the compiler doesn't decide to generate code in a silly
way.
Thanks,
Mark.
next prev parent reply other threads:[~2022-05-26 15:26 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-26 10:52 [PATCH 0/7] x86: Address various objtool complaints Peter Zijlstra
2022-05-26 10:52 ` [PATCH 1/7] x86/entry: Anchor annotation Peter Zijlstra
2022-05-26 15:04 ` Josh Poimboeuf
2022-05-26 10:52 ` [PATCH 2/7] objtool: Extend UNWIND_HINT based ENDBR rules Peter Zijlstra
2022-05-26 15:05 ` Josh Poimboeuf
2022-05-28 14:09 ` Peter Zijlstra
2022-05-26 10:52 ` [PATCH 3/7] objtool: Mark __ubsan_handle_builtin_unreachable() as noreturn Peter Zijlstra
2022-05-30 13:17 ` Marco Elver
2022-05-26 10:52 ` [PATCH 4/7] x86/cpu: Elide KCSAN for cpu_has() and friends Peter Zijlstra
2022-05-30 13:14 ` Marco Elver
2022-05-26 10:52 ` [PATCH 5/7] jump_label,noinstr: Avoid instrumentation for JUMP_LABEL=n builds Peter Zijlstra
2022-05-30 13:20 ` Marco Elver
2022-05-26 10:52 ` [PATCH 6/7] x86: Always inline on_thread_stack() and current_top_of_stack() Peter Zijlstra
2022-05-30 10:38 ` [tip: objtool/urgent] " tip-bot2 for Peter Zijlstra
2022-05-30 13:21 ` [PATCH 6/7] " Marco Elver
2022-05-26 10:52 ` [PATCH 7/7] context_tracking: Always inline empty stubs Peter Zijlstra
2022-05-26 15:02 ` Josh Poimboeuf
2022-05-26 15:10 ` Mark Rutland
2022-05-26 15:16 ` Josh Poimboeuf
2022-05-26 15:26 ` Mark Rutland [this message]
2022-05-30 10:38 ` [tip: objtool/urgent] " tip-bot2 for Peter Zijlstra
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