From: Peter Zijlstra <peterz@infradead.org>
To: Richard Biener <rguenther@suse.de>
Cc: "Luis R. Rodriguez" <mcgrof@kernel.org>,
Vegard Nossum <vegard.nossum@oracle.com>,
Jiri Slaby <jslaby@suse.cz>,
linux-kernel@vger.kernel.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
stable@vger.kernel.org, Ming Lei <ming.lei@canonical.com>,
Steven Rostedt <srostedt@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Cesar Eduardo Barros <cesarb@cesarb.eti.br>,
Michael Matz <matz@suse.de>, David Miller <davem@davemloft.net>,
Guenter Roeck <linux@roeck-us.net>,
Fengguang Wu <fengguang.wu@intel.com>,
Borislav Petkov <bp@alien8.de>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>,
Kees Cook <keescook@chromium.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 01/12] extarray: define helpers for arrays defined in linker scripts
Date: Wed, 19 Oct 2016 13:31:16 +0200 [thread overview]
Message-ID: <20161019113116.GL3102@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <alpine.LSU.2.11.1610191303570.2258@t29.fhfr.qr>
On Wed, Oct 19, 2016 at 01:11:31PM +0200, Richard Biener wrote:
> For C++ these kind of warnings trigger whenever abstraction penalty
> is removed. Like the typical
>
> template <int i> foo () { if (i) { <code> } }
>
> triggering for a hypothetical -Wdead-code for i == 0. The kernel
> is known for its "C" abstraction stuff and I can believe that
> such -W flag would trigger for cases where abstraction is removed.
Sure, we very much rely on dead code elimination and constant
propagation all over the place. I was mostly thinking about the specific
case where it was triggered by alias analysis. I'm not sure how often
we'd trigger that.
next prev parent reply other threads:[~2016-10-19 14:36 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-16 15:16 [PATCH 00/12] external array access helpers Vegard Nossum
2016-10-16 15:16 ` [PATCH 01/12] extarray: define helpers for arrays defined in linker scripts Vegard Nossum
2016-10-17 7:04 ` Greg Kroah-Hartman
2016-10-17 8:33 ` Peter Zijlstra
2016-10-17 9:01 ` Jiri Slaby
2016-10-17 9:09 ` Peter Zijlstra
2016-10-17 11:27 ` Vegard Nossum
2016-10-17 11:45 ` Peter Zijlstra
2016-10-18 8:08 ` Vegard Nossum
2016-10-18 21:18 ` Luis R. Rodriguez
2016-10-19 8:18 ` Richard Biener
2016-10-19 9:13 ` Peter Zijlstra
2016-10-19 9:33 ` Richard Biener
2016-10-19 10:25 ` Peter Zijlstra
2016-10-19 11:11 ` Richard Biener
2016-10-19 11:31 ` Peter Zijlstra [this message]
2016-11-02 12:11 ` Markus Trippelsdorf
2016-11-02 12:14 ` Richard Biener
2016-11-02 15:02 ` Linus Torvalds
2016-10-19 7:16 ` Jiri Slaby
2016-10-16 15:16 ` [PATCH 02/12] firmware: declare {__start,__end}_builtin_fw as external array Vegard Nossum
2016-10-16 15:16 ` [PATCH 03/12] ftrace: declare __{start,stop}_mcount_loc " Vegard Nossum
2016-10-16 15:16 ` [PATCH 04/12] tracing: declare __{start,stop}_{annotated_,}branch_profile " Vegard Nossum
2016-10-16 15:16 ` [PATCH 05/12] kprobes: declare __{start,stop}_kprobe_blacklist " Vegard Nossum
2016-10-17 5:53 ` Masami Hiramatsu
2016-10-16 15:16 ` [PATCH 06/12] tracing: declare __{start,stop}_ftrace_events " Vegard Nossum
2016-10-16 15:16 ` [PATCH 07/12] tracing: declare __{start,stop}_ftrace_enum_maps " Vegard Nossum
2016-10-16 15:16 ` [PATCH 08/12] tracing: declare __trace_bprintk_fmt/__tracepoint_str as external arrays Vegard Nossum
2016-10-16 15:16 ` [PATCH 09/12] tracing: declare __{start,stop}_syscalls_metadata as external array Vegard Nossum
2016-10-16 15:16 ` [PATCH 10/12] serial_core: declare __earlycon_table{,_end} " Vegard Nossum
2016-10-16 15:16 ` [PATCH 11/12] jump_label: declare jump table " Vegard Nossum
2016-10-16 16:25 ` Peter Zijlstra
2016-10-16 16:50 ` Vegard Nossum
2016-10-16 17:44 ` Peter Zijlstra
2016-10-17 21:33 ` Steven Rostedt
2016-10-16 15:16 ` [PATCH 12/12] dynamic debug: declare " Vegard Nossum
2016-10-16 16:14 ` [PATCH 00/12] external array access helpers Greg Kroah-Hartman
2016-10-16 17:05 ` Vegard Nossum
2016-10-17 7:02 ` Greg Kroah-Hartman
2016-10-17 6:26 ` Jiri Slaby
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