From: "H. Peter Anvin" <hpa@zytor.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: linux-arch@vger.kernel.org,
Russell King - ARM Linux <linux@arm.linux.org.uk>,
Arnd Bergmann <arnd@arndb.de>, Chen Gang <gang.chen@asianux.com>,
linux-kernel@vger.kernel.org,
Geert Uytterhoeven <geert@linux-m68k.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH, re-send] Always trap on BUG()
Date: Tue, 23 Jul 2013 02:54:06 -0700 [thread overview]
Message-ID: <51EE52BE.5080204@zytor.com> (raw)
In-Reply-To: <20130723093628.GC19786@gmail.com>
On 07/23/2013 02:36 AM, Ingo Molnar wrote:
>>
>> Well, there are three alternatives here, right:
>>
>> 1. We can use unreachable(), which means that the compiler can assume it
>> never happens.
>
> AFAICS this is dangerous as it loses warnings and moves execution into
> la-la-land without any obvious sign at the C level.
>
Extremely dangerous.
-hpa
WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>,
Andrew Morton <akpm@linux-foundation.org>,
Arnd Bergmann <arnd@arndb.de>,
linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Chen Gang <gang.chen@asianux.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Geert Uytterhoeven <geert@linux-m68k.org>
Subject: Re: [PATCH, re-send] Always trap on BUG()
Date: Tue, 23 Jul 2013 02:54:06 -0700 [thread overview]
Message-ID: <51EE52BE.5080204@zytor.com> (raw)
Message-ID: <20130723095406.j2JlnyBqb6MTDbsNaopKTOKIBwogMzVfOHTzoDbR1hY@z> (raw)
In-Reply-To: <20130723093628.GC19786@gmail.com>
On 07/23/2013 02:36 AM, Ingo Molnar wrote:
>>
>> Well, there are three alternatives here, right:
>>
>> 1. We can use unreachable(), which means that the compiler can assume it
>> never happens.
>
> AFAICS this is dangerous as it loses warnings and moves execution into
> la-la-land without any obvious sign at the C level.
>
Extremely dangerous.
-hpa
WARNING: multiple messages have this Message-ID (diff)
From: hpa@zytor.com (H. Peter Anvin)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH, re-send] Always trap on BUG()
Date: Tue, 23 Jul 2013 02:54:06 -0700 [thread overview]
Message-ID: <51EE52BE.5080204@zytor.com> (raw)
In-Reply-To: <20130723093628.GC19786@gmail.com>
On 07/23/2013 02:36 AM, Ingo Molnar wrote:
>>
>> Well, there are three alternatives here, right:
>>
>> 1. We can use unreachable(), which means that the compiler can assume it
>> never happens.
>
> AFAICS this is dangerous as it loses warnings and moves execution into
> la-la-land without any obvious sign at the C level.
>
Extremely dangerous.
-hpa
next prev parent reply other threads:[~2013-07-23 9:54 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-05 15:38 [PATCH, re-send] Always trap on BUG() Arnd Bergmann
2013-07-05 15:38 ` Arnd Bergmann
2013-07-12 10:15 ` Ingo Molnar
2013-07-12 10:15 ` Ingo Molnar
2013-07-15 22:16 ` Andrew Morton
2013-07-15 22:16 ` Andrew Morton
2013-07-15 22:27 ` Russell King - ARM Linux
2013-07-15 22:27 ` Russell King - ARM Linux
2013-07-15 22:35 ` H. Peter Anvin
2013-07-15 22:35 ` H. Peter Anvin
2013-07-15 22:35 ` H. Peter Anvin
2013-07-15 22:47 ` Russell King - ARM Linux
2013-07-15 22:47 ` Russell King - ARM Linux
2013-07-23 9:36 ` Ingo Molnar
2013-07-23 9:36 ` Ingo Molnar
2013-07-23 9:54 ` H. Peter Anvin [this message]
2013-07-23 9:54 ` H. Peter Anvin
2013-07-23 9:54 ` H. Peter Anvin
2013-07-24 0:00 ` Chen Gang
2013-07-24 0:00 ` Chen Gang
2013-07-25 22:05 ` Ingo Molnar
2013-07-25 22:05 ` Ingo Molnar
2013-07-26 1:05 ` Chen Gang
2013-07-26 1:05 ` Chen Gang
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