From: Daniel Santos <danielfsantos@att.net>
To: Josh Triplett <josh@joshtriplett.org>
Cc: Borislav Petkov <bp@alien8.de>,
LKML <linux-kernel@vger.kernel.org>,
Andi Kleen <ak@linux.intel.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Christopher Li <sparse@chrisli.org>,
David Daney <david.daney@cavium.com>,
David Howells <dhowells@redhat.com>,
David Rientjes <rientjes@google.com>,
Joe Perches <joe@perches.com>,
Konstantin Khlebnikov <khlebnikov@openvz.org>,
linux-sparse@vger.kernel.org,
Michel Lespinasse <walken@google.com>,
Paul Gortmaker <paul.gortmaker@windriver.com>,
Pavel Pisa <pisa@cmp.felk.cvut.cz>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Steven Rostedt <rostedt@goodmis.org>,
Daniel Santos <daniel.santos@pobox.com>
Subject: Re: [PATCH v2 09/10] bug.h: Add BUILD_BUG_ON_MSG & BUILD_BUG_INTERNAL{,2}
Date: Fri, 05 Oct 2012 23:41:01 -0500 [thread overview]
Message-ID: <506FB65D.70109@att.net> (raw)
In-Reply-To: <20121005210258.GB7362@jtriplet-mobl1>
On 10/05/2012 04:02 PM, Josh Triplett wrote:
> On Fri, Oct 05, 2012 at 10:58:58PM +0200, Borislav Petkov wrote:
>> On Fri, Oct 05, 2012 at 02:42:48PM -0500, danielfsantos@att.net wrote:
>>> Add BUILD_BUG_ON_MSG which behaves like BUILD_BUG_ON (with optimizations
>>> turned enabled), except that it allows you to specify the error message
>>> you want emitted as the third parameter. Under the hood, this relies on
>>> BUILD_BUG_INTERNAL{,2}, which does the actual work and is pretty-much
>>> identical to BUILD_BUG_ON.
>>>
>>> Signed-off-by: Daniel Santos <daniel.santos@pobox.com>
>>> ---
>>> include/linux/bug.h | 26 ++++++++++++++++++++++++++
>>> 1 files changed, 26 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/include/linux/bug.h b/include/linux/bug.h
>>> index 1b43ea2..91bd9d5 100644
>>> --- a/include/linux/bug.h
>>> +++ b/include/linux/bug.h
>>> @@ -16,6 +16,7 @@ struct pt_regs;
>>> #define BUILD_BUG_ON_NOT_POWER_OF_2(n)
>>> #define BUILD_BUG_ON_ZERO(e) (0)
>>> #define BUILD_BUG_ON_NULL(e) ((void*)0)
>>> +#define BUILD_BUG_ON_MSG(cond, msg) (0)
>>> #define BUILD_BUG_ON(condition) (0)
>>> #define BUILD_BUG() (0)
>>> #else /* __CHECKER__ */
>>> @@ -38,6 +39,31 @@ struct pt_regs;
>>> */
>>> #define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e))))
>>>
>>> +#define _CONCAT1(a, b) a##b
>>> +#define CONCAT(a, b) _CONCAT1(a, b)
>>
>> Let's call the indirection _CONCAT without the "1".
No problem, naming conventions are good! :)
>>
>>> +#define UNIQUIFY(prefix) CONCAT(prefix, __LINE__)
>>> +
>>> +#define BUILD_BUG_INTERNAL2(condition, msg, fn) \
>>> + do { \
>>> + extern void fn (void) __compiletime_error(msg); \
>>> + __compiletime_error_fallback(condition); \
>>> + if (condition) \
>>> + fn(); \
>>> + } while (0)
>>> +
>>> +#define BUILD_BUG_INTERNAL(condition, msg, fn) \
>>> + BUILD_BUG_INTERNAL2(condition, msg, fn)
>>
>> Ditto. BUILD_BUG_INTERNAL2 should be __BUILD_BUG_INTERNAL and the one
>> calling it _BUILD_BUG_INTERNAL (with one underscore).
>
> Also, you don't need both the BUILD_BUG_INTERNAL and CONCAT/UNIQUIFY
> macros. My original implementation just used the BUILD_BUG_INTERNAL
> family of macros; if you'd rather rename them, by all means do so, but I
> don't think you need two separate families of multiply-indirect macros.
Yeah, I was thinking in terms of reusable macros. I'm kinda thinking the
kernel needs a header just for handy little macros, like concat,
uniquify, the
IS_EMPTY and IF_EMPTY macros of mine in rbtree.h, etc. There is a
stringify.h
that just contains a __stringify macro. But here, it's just verbose, so
I'll
change it back to how you had it.
>>> +
>>> +/**
>>> + * BUILD_BUG_ON_MSG - break compile if a condition is true & emit supplied
>>> + * error message.
>>> + * @condition: the condition which the compiler should know is false.
>>> + *
>>> + * See BUILD_BUG_ON for description.
>>> + */
>>> +#define BUILD_BUG_ON_MSG(cond, msg) \
>>> + BUILD_BUG_INTERNAL(cond, msg, UNIQUIFY(__build_bug_on_failed_))
>>
>> Btw, why are we adding the line at all? It is issued by gcc anyway:
>>
>> cc -Wall macros.c -o macros
>> macros.c: In function ‘main’:
>> macros.c:22:1: error: ‘__build_bug_on_failed_22’ undeclared (first use in this function)
>
> Because without that, you end up writing multiple prototypes for the
> same function (__build_bug_on_failed) with different error attributes,
> and GCC will ignore all but the last error attribute it sees, even with
> a scoped prototype.
Yeah, this is part of the trick to get non-existent functions with different
messages on their error attributes, so that each BUILD_BUG_ON-type macro can
have more helpful text in its error message. I don't know what's in your
macros.c, but it should have given you a much more shiny error message.
Daniel
next prev parent reply other threads:[~2012-10-06 4:41 UTC|newest]
Thread overview: 187+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-28 23:20 [PATCH 0/10] Cleanup & new features for compiler*.h and bug.h Daniel Santos
2012-09-28 23:20 ` [PATCH 1/10] compiler-gcc4.h: correct verion check for __compiletime_error Daniel Santos
2012-10-03 6:25 ` David Rientjes
2012-10-11 20:54 ` Michal Marek
2012-09-28 23:20 ` [PATCH 2/10] compiler-gcc4.h: Reorder macros based upon gcc ver Daniel Santos
2012-10-03 6:28 ` David Rientjes
2012-09-28 23:20 ` [PATCH 3/10] compiler-gcc.h: Add gcc-recommended GCC_VERSION macro Daniel Santos
2012-09-30 13:20 ` Borislav Petkov
2012-09-30 23:11 ` Daniel Santos
2012-10-01 0:22 ` Josh Triplett
2012-10-03 6:32 ` David Rientjes
2012-09-28 23:20 ` [PATCH 4/10] compiler-gcc{3,4}.h: Use " Daniel Santos
2012-09-29 0:20 ` Josh Triplett
2012-09-29 0:31 ` [Bulk] " Daniel Santos
2012-09-29 0:42 ` Josh Triplett
2012-10-03 6:40 ` David Rientjes
2012-09-28 23:20 ` [PATCH 5/10] compiler{,-gcc4}.h: Remove duplicate macros Daniel Santos
2012-09-29 0:23 ` Josh Triplett
2012-09-29 0:34 ` [Bulk] " Daniel Santos
2012-09-29 0:48 ` Josh Triplett
2012-09-28 23:20 ` [PATCH 6/10] bug.h: Replace __linktime_error with __compiletime_error Daniel Santos
2012-09-29 0:23 ` Josh Triplett
2012-09-29 1:04 ` Steven Rostedt
2012-09-30 13:22 ` Borislav Petkov
2012-09-30 21:13 ` Daniel Santos
2012-10-03 6:44 ` David Rientjes
2012-10-03 11:49 ` Daniel Santos
2012-10-03 15:35 ` Josh Triplett
2012-10-03 18:26 ` David Rientjes
2012-10-04 0:26 ` Daniel Santos
2012-10-04 21:51 ` David Rientjes
2012-09-28 23:20 ` [PATCH 7/10] compiler{,-gcc4}.h: Introduce __flatten function attribute Daniel Santos
2012-09-29 0:26 ` Josh Triplett
2012-09-29 0:38 ` Daniel Santos
2012-09-29 0:50 ` Josh Triplett
2012-10-03 6:49 ` David Rientjes
2012-10-03 6:59 ` Josh Triplett
2012-10-03 7:53 ` David Rientjes
2012-10-03 11:20 ` Daniel Santos
2012-10-03 14:01 ` Steven Rostedt
2012-10-03 14:46 ` Daniel Santos
2012-10-03 15:14 ` Steven Rostedt
2012-10-03 15:23 ` Peter Zijlstra
2012-10-03 15:38 ` Joe Perches
2012-10-04 0:32 ` Steven Rostedt
2012-10-04 0:54 ` Daniel Santos
2012-10-04 2:33 ` Joe Perches
2012-10-04 0:55 ` Michel Lespinasse
2012-09-28 23:20 ` [PATCH 8/10] bug.h: Make BUILD_BUG_ON generate compile-time error Daniel Santos
2012-09-29 0:32 ` Josh Triplett
2012-09-29 0:51 ` Daniel Santos
2012-09-29 1:26 ` Daniel Santos
2012-09-29 2:55 ` Josh Triplett
2012-09-30 23:29 ` Daniel Santos
2012-10-01 0:26 ` Josh Triplett
2012-10-02 0:48 ` Michel Lespinasse
2012-10-02 14:57 ` Daniel Santos
2012-09-28 23:20 ` [PATCH 9/10] bug.h: Add BUILD_BUG_ON_NON_CONST macro Daniel Santos
2012-09-28 23:20 ` [PATCH 10/10] bug.h: Add gcc 4.2+ versions of BUILD_BUG_ON_* macros Daniel Santos
2012-10-02 0:55 ` Michel Lespinasse
2012-10-02 16:04 ` Daniel Santos
2012-10-05 19:35 ` [PATCH v2 0/10] Cleanup & new features for compiler*.h and bug.h danielfsantos
2012-10-05 19:42 ` [PATCH v2 01/10] compiler-gcc4.h: Reorder macros based upon gcc ver danielfsantos
2012-10-06 17:42 ` Borislav Petkov
2012-10-06 17:54 ` Daniel Santos
2012-10-18 2:26 ` David Rientjes
2012-10-05 19:42 ` [PATCH v2 02/10] compiler-gcc.h: Add gcc-recommended GCC_VERSION macro danielfsantos
2012-10-05 19:42 ` [PATCH v2 03/10] compiler-gcc{3,4}.h: Use " danielfsantos
2012-10-06 23:05 ` Borislav Petkov
2012-10-06 23:10 ` Borislav Petkov
2012-10-07 18:27 ` Daniel Santos
2012-10-07 19:42 ` Borislav Petkov
2012-10-07 20:21 ` Daniel Santos
2012-10-09 18:41 ` Andrew Morton
2012-10-09 19:45 ` Josh Triplett
2012-10-05 19:42 ` [PATCH v2 04/10] bug.h: directly include linux/compiler.h danielfsantos
2012-10-05 19:42 ` [PATCH v2 05/10] compiler{,-gcc4}.h, bug.h: Remove duplicate macros danielfsantos
2012-10-05 19:42 ` [PATCH v2 06/10] bug.h: Make BUILD_BUG_ON generate compile-time error danielfsantos
2012-10-05 19:42 ` [PATCH v2 07/10] compiler.h, bug.h: Prevent double error messages with BUILD_BUG{,_ON} danielfsantos
2012-10-05 20:59 ` Josh Triplett
2012-10-06 4:28 ` Daniel Santos
2012-10-05 19:42 ` [PATCH v2 08/10] bug.h: Fix BUILD_BUG_ON macro in __CHECKER__ danielfsantos
2012-10-05 19:42 ` [PATCH v2 09/10] bug.h: Add BUILD_BUG_ON_MSG & BUILD_BUG_INTERNAL{,2} danielfsantos
2012-10-05 20:58 ` Borislav Petkov
2012-10-05 21:02 ` Josh Triplett
2012-10-06 4:41 ` Daniel Santos [this message]
2012-10-05 21:04 ` Steven Rostedt
2012-10-05 19:42 ` [PATCH v2 10/10] bug.h: Convert BUILD_BUG{,_ON} to use BUILD_BUG_ON_MSG danielfsantos
2012-10-05 20:27 ` [PATCH v2 0/10] Cleanup & new features for compiler*.h and bug.h Steven Rostedt
2012-10-07 18:36 ` Daniel Santos
2012-10-24 16:28 ` [PATCH v3 " danielfsantos
2012-10-24 16:33 ` [PATCH v3 01/10] compiler-gcc4.h: Reorder macros based upon gcc ver danielfsantos
2012-10-24 16:33 ` [PATCH v3 02/10] compiler-gcc.h: Add gcc-recommended GCC_VERSION macro danielfsantos
2012-10-24 16:33 ` [PATCH v3 03/10] compiler-gcc{3,4}.h: Use " danielfsantos
2012-10-24 19:05 ` Borislav Petkov
2012-10-24 21:49 ` Josh Triplett
2012-10-24 22:34 ` Borislav Petkov
2012-10-24 16:33 ` [PATCH v3 04/10] bug.h: directly include linux/compiler.h danielfsantos
2012-10-24 19:55 ` Borislav Petkov
2012-10-28 19:23 ` Daniel Santos
2012-10-24 16:33 ` [PATCH v3 05/10] compiler{,-gcc4}.h, bug.h: Remove duplicate macros danielfsantos
2012-10-25 9:26 ` Borislav Petkov
2012-10-24 16:33 ` [PATCH v3 06/10] bug.h: Make BUILD_BUG_ON generate compile-time error danielfsantos
2012-10-25 9:33 ` Borislav Petkov
2012-10-24 16:33 ` [PATCH v3 07/10] compiler.h, bug.h: Prevent double error messages with BUILD_BUG{,_ON} danielfsantos
2012-10-24 16:33 ` [PATCH v3 08/10] bug.h: Fix BUILD_BUG_ON macro in __CHECKER__ danielfsantos
2012-10-24 16:34 ` [PATCH v3 09/10] bug.h: Add BUILD_BUG_ON_MSG & _BUILD_BUG_INTERNAL danielfsantos
2012-10-24 16:34 ` [PATCH v3 10/10] bug.h: Convert BUILD_BUG{,_ON} to use BUILD_BUG_ON_MSG danielfsantos
2012-10-28 20:53 ` [PATCH v4 0/10] Cleanup & new features for compiler*.h and bug.h danielfsantos
2012-10-28 20:57 ` [PATCH v4 1/9] compiler-gcc4.h: Reorder macros based upon gcc ver danielfsantos
2012-10-30 12:02 ` Borislav Petkov
2012-10-28 20:57 ` [PATCH v4 2/9] compiler-gcc.h: Add gcc-recommended GCC_VERSION macro danielfsantos
2012-10-28 20:57 ` [PATCH v4 3/9] compiler-gcc{3,4}.h: Use " danielfsantos
2012-10-28 20:57 ` [PATCH v4 4/9] compiler{,-gcc4}.h, bug.h: Remove duplicate macros danielfsantos
2012-10-28 20:57 ` [PATCH v4 5/9] bug.h: Make BUILD_BUG_ON generate compile-time error danielfsantos
2012-10-28 20:57 ` [PATCH v4 6/9] compiler.h, bug.h: Prevent double error messages with BUILD_BUG{,_ON} danielfsantos
2012-10-30 16:19 ` Borislav Petkov
2012-10-31 5:34 ` Daniel Santos
2012-10-31 11:06 ` Borislav Petkov
2012-10-31 16:38 ` Daniel Santos
2012-11-03 18:10 ` Daniel Santos
2012-10-28 20:57 ` [PATCH v4 7/9] bug.h: Fix BUILD_BUG_ON macro in __CHECKER__ danielfsantos
2012-10-30 16:44 ` Borislav Petkov
2012-10-28 20:57 ` [PATCH v4 8/9] bug.h: Add BUILD_BUG_ON_MSG & _BUILD_BUG_INTERNAL danielfsantos
2012-10-30 17:17 ` Borislav Petkov
2012-10-30 21:57 ` Borislav Petkov
2012-10-28 20:57 ` [PATCH v4 9/9] bug.h: Convert BUILD_BUG{,_ON} to use BUILD_BUG_ON_MSG danielfsantos
2012-10-30 19:19 ` Borislav Petkov
2012-10-31 1:02 ` Josh Triplett
2012-10-31 5:48 ` Daniel Santos
2012-11-13 22:09 ` [PATCH v5 0/9] Cleanup & new features for compiler*.h and bug.h danielfsantos
2012-11-13 22:13 ` [PATCH v5 1/9] compiler-gcc4.h: Reorder macros based upon gcc ver danielfsantos
2012-11-13 22:13 ` [PATCH v5 2/9] compiler-gcc.h: Add gcc-recommended GCC_VERSION macro danielfsantos
2012-11-13 22:13 ` [PATCH v5 3/9] compiler-gcc{3,4}.h: Use " danielfsantos
2012-11-13 22:13 ` [PATCH v5 4/9] compiler{,-gcc4}.h, bug.h: Remove duplicate macros danielfsantos
2012-11-13 22:13 ` [PATCH v5 5/9] bug.h: Fix BUILD_BUG_ON macro in __CHECKER__ danielfsantos
2012-11-15 15:07 ` Borislav Petkov
2012-11-13 22:13 ` [PATCH v5 6/9] bug.h: Prevent double evaulation of in BUILD_BUG_ON danielfsantos
2012-11-15 15:07 ` Borislav Petkov
2012-11-15 19:11 ` Daniel Santos
2012-11-17 14:38 ` Borislav Petkov
2012-11-20 19:10 ` Daniel Santos
2012-11-13 22:13 ` [PATCH v5 7/9] bug.h: Make BUILD_BUG_ON generate compile-time error danielfsantos
2012-11-13 22:24 ` Daniel Santos
2012-11-15 15:07 ` Borislav Petkov
2012-11-13 22:13 ` [PATCH v5 8/9] compiler.h, bug.h: Prevent double error messages with BUILD_BUG{,_ON} danielfsantos
2012-11-15 15:08 ` Borislav Petkov
2012-11-15 19:44 ` Daniel Santos
2012-11-17 14:39 ` Borislav Petkov
2012-11-13 22:13 ` [PATCH v5 9/9] bug.h, compiler.h: Introduce compiletime_assert & BUILD_BUG_ON_MSG danielfsantos
2012-11-15 15:08 ` Borislav Petkov
2012-11-16 23:25 ` Daniel Santos
2012-11-20 20:42 ` [PATCH v6 0/9] Cleanup & new features for compiler*.h and bug.h danielfsantos
2012-11-20 21:04 ` [PATCH v6 1/9] compiler-gcc4.h: Reorder macros based upon gcc ver danielfsantos
2012-11-20 21:05 ` [PATCH v6 2/9] compiler-gcc.h: Add gcc-recommended GCC_VERSION macro danielfsantos
2012-11-20 21:05 ` [PATCH v6 3/9] compiler-gcc{3,4}.h: Use " danielfsantos
2012-11-20 21:05 ` [PATCH v6 4/9] compiler{,-gcc4}.h, bug.h: Remove duplicate macros danielfsantos
2012-11-20 21:05 ` [PATCH v6 5/9] bug.h: Fix BUILD_BUG_ON macro in __CHECKER__ danielfsantos
2012-11-20 21:05 ` [PATCH v6 6/9] bug.h: Prevent double evaulation of in BUILD_BUG_ON danielfsantos
2012-11-22 13:42 ` Borislav Petkov
2012-11-20 21:05 ` [PATCH v6 7/9] bug.h: Make BUILD_BUG_ON generate compile-time error danielfsantos
2012-11-20 21:05 ` [PATCH v6 8/9] compiler.h, bug.h: Prevent double error messages with BUILD_BUG{,_ON} danielfsantos
2012-11-22 13:43 ` Borislav Petkov
2012-11-20 21:05 ` [PATCH v6 9/9] bug.h, compiler.h: Introduce compiletime_assert & BUILD_BUG_ON_MSG danielfsantos
2012-11-21 2:35 ` [PATCH v6 0/9] Cleanup & new features for compiler*.h and bug.h Michel Lespinasse
2012-11-22 13:44 ` Borislav Petkov
2013-01-01 21:08 ` [PATCH v7 " danielfsantos
2013-01-01 21:09 ` [PATCH v7 1/9] compiler-gcc4.h: Reorder macros based upon gcc ver danielfsantos
2013-01-01 21:09 ` [PATCH v7 2/9] compiler-gcc.h: Add gcc-recommended GCC_VERSION macro danielfsantos
2013-01-01 21:09 ` [PATCH v7 3/9] compiler-gcc{3,4}.h: Use " danielfsantos
2013-01-01 21:09 ` [PATCH v7 4/9] compiler{,-gcc4}.h, bug.h: Remove duplicate macros danielfsantos
2013-01-01 21:09 ` [PATCH v7 5/9] bug.h: Fix BUILD_BUG_ON macro in __CHECKER__ danielfsantos
2013-01-01 21:09 ` [PATCH v7 6/9] bug.h: Prevent double evaulation of in BUILD_BUG_ON danielfsantos
2013-01-01 21:09 ` [PATCH v7 7/9] bug.h: Make BUILD_BUG_ON generate compile-time error danielfsantos
2013-01-01 21:09 ` [PATCH v7 8/9] compiler.h, bug.h: Prevent double error messages with BUILD_BUG{,_ON} danielfsantos
2013-01-01 21:09 ` [PATCH v7 9/9] bug.h, compiler.h: Introduce compiletime_assert & BUILD_BUG_ON_MSG danielfsantos
2013-01-01 21:27 ` [PATCH v7 1/9] compiler-gcc4.h: Reorder macros based upon gcc ver Daniel Santos
2013-01-01 22:54 ` [PATCH v8 0/9] Cleanup & new features for compiler*.h and bug.h danielfsantos
2013-01-01 22:54 ` [PATCH v8 1/9] compiler-gcc4.h: Reorder macros based upon gcc ver danielfsantos
2013-01-01 22:54 ` [PATCH v8 2/9] compiler-gcc.h: Add gcc-recommended GCC_VERSION macro danielfsantos
2013-01-01 22:54 ` [PATCH v8 3/9] compiler-gcc{3,4}.h: Use " danielfsantos
2013-01-01 22:54 ` [PATCH v8 4/9] compiler{,-gcc4}.h, bug.h: Remove duplicate macros danielfsantos
2013-01-01 22:54 ` [PATCH v8 5/9] bug.h: Fix BUILD_BUG_ON macro in __CHECKER__ danielfsantos
2013-01-01 22:54 ` [PATCH v8 6/9] bug.h: Prevent double evaulation of in BUILD_BUG_ON danielfsantos
2013-01-01 22:54 ` [PATCH v8 7/9] bug.h: Make BUILD_BUG_ON generate compile-time error danielfsantos
2013-01-01 22:54 ` [PATCH v8 8/9] compiler.h, bug.h: Prevent double error messages with BUILD_BUG{,_ON} danielfsantos
2013-01-01 22:54 ` [PATCH v8 9/9] bug.h, compiler.h: Introduce compiletime_assert & BUILD_BUG_ON_MSG danielfsantos
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