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From: Xunlei Pang <xpang@redhat.com>
To: Stephen Rothwell <sfr@canb.auug.org.au>,
	Andrew Morton <akpm@linux-foundation.org>
Cc: Linux-Next Mailing List <linux-next@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Xunlei Pang <xlpang@redhat.com>
Subject: Re: linux-next: build warning after merge of the akpm-current tree
Date: Mon, 15 May 2017 12:02:18 +0800
Message-ID: <5919284A.4050202@redhat.com> (raw)
In-Reply-To: <20170515115602.30e05989@canb.auug.org.au>

On 05/15/2017 at 09:56 AM, Stephen Rothwell wrote:
> Hi Andrew,
>
> After merging the akpm-current tree, today's linux-next build (arm
> multi_v7_defconfig) produced this warning:
>
> In file included from include/asm-generic/bug.h:15:0,
>                  from arch/arm/include/asm/bug.h:59,
>                  from include/linux/bug.h:4,
>                  from include/linux/elfcore.h:5,
>                  from include/linux/crash_core.h:5,
>                  from kernel/crash_core.c:9:
> kernel/crash_core.c: In function 'vmcoreinfo_append_str':
> include/linux/kernel.h:757:16: warning: comparison of distinct pointer types lacks a cast
>   (void) (&min1 == &min2);   \
>                 ^
> include/linux/kernel.h:760:2: note: in expansion of macro '__min'
>   __min(typeof(x), typeof(y),   \
>   ^
> kernel/crash_core.c:360:6: note: in expansion of macro 'min'
>   r = min(r, VMCOREINFO_BYTES - vmcoreinfo_size);
>       ^
>
> Introduced by commit
>
>   fc7d2b44367f ("powerpc/fadump: use the correct VMCOREINFO_NOTE_SIZE for phdr")
>

Hi Stephen/Andrew,

Sorry for the trouble.

The following patch will fix it, do you want to me to send it out separately? or help merge it into
fc7d2b44367f ("powerpc/fadump: use the correct VMCOREINFO_NOTE_SIZE for phdr") directly?

Thanks,
Xunlei

===========================================

From: Xunlei Pang <xlpang@redhat.com>
Subject: [PATCH] crash: Fix build warning

linux-next build (arm multi_v7_defconfig) produced this warning:

In file included from include/asm-generic/bug.h:15:0,
                 from arch/arm/include/asm/bug.h:59,
                 from include/linux/bug.h:4,
                 from include/linux/elfcore.h:5,
                 from include/linux/crash_core.h:5,
                 from kernel/crash_core.c:9:
kernel/crash_core.c: In function 'vmcoreinfo_append_str':
include/linux/kernel.h:757:16: warning: comparison of distinct pointer
types lacks a cast
  (void) (&min1 == &min2);   \
                ^
include/linux/kernel.h:760:2: note: in expansion of macro '__min'
  __min(typeof(x), typeof(y),   \
  ^
kernel/crash_core.c:360:6: note: in expansion of macro 'min'
  r = min(r, VMCOREINFO_BYTES - vmcoreinfo_size);
      ^

This patch fixes it.

Signed-off-by: Xunlei Pang <xlpang@redhat.com>
---
 kernel/crash_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index 4a4a4ba..6db80fc 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -357,7 +357,7 @@ void vmcoreinfo_append_str(const char *fmt, ...)
     r = vscnprintf(buf, sizeof(buf), fmt, args);
     va_end(args);
 
-    r = min(r, VMCOREINFO_BYTES - vmcoreinfo_size);
+    r = min(r, (size_t)VMCOREINFO_BYTES - vmcoreinfo_size);
 
     memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);
 
-- 
1.8.3.1

  reply index

Thread overview: 84+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-15  1:56 Stephen Rothwell
2017-05-15  4:02 ` Xunlei Pang [this message]
2017-05-15  5:07   ` Stephen Rothwell
  -- strict thread matches above, loose matches on Subject: below --
2019-11-06  7:05 Stephen Rothwell
2019-11-06  7:52 ` Shaokun Zhang
2019-11-06  6:54 Stephen Rothwell
2019-08-07  8:00 Stephen Rothwell
2019-08-07 11:29 ` Rikard Falkeborn
2019-08-07 23:31   ` Stephen Rothwell
2019-07-31  6:16 Stephen Rothwell
2019-07-31 12:01 ` Jia-Ju Bai
2019-07-31  6:11 Stephen Rothwell
2019-07-31  6:28 ` Miles Chen
2019-08-01  5:51   ` Stephen Rothwell
2019-08-01  6:15     ` Michal Hocko
2019-08-01  6:30       ` Miles Chen
2019-08-01  6:38         ` Michal Hocko
2019-08-01  6:39         ` Stephen Rothwell
2019-08-01  6:42           ` Miles Chen
2019-07-29  3:48 Stephen Rothwell
2019-07-29  3:44 Stephen Rothwell
2019-05-30  4:55 Stephen Rothwell
2019-05-30  9:02 ` Matteo Croce
2019-03-29  2:39 Stephen Rothwell
2019-04-16  6:52 ` Stephen Rothwell
2019-04-16 22:45   ` Andrew Morton
2019-01-31  5:01 Stephen Rothwell
2018-06-08  4:45 Stephen Rothwell
2018-05-04  4:17 Stephen Rothwell
2018-05-04 15:39 ` Randy Dunlap
2018-05-07 14:10   ` Minchan Kim
2018-05-07 16:47     ` Randy Dunlap
2018-05-08 10:48       ` Minchan Kim
2018-04-06  4:53 Stephen Rothwell
2018-01-02  7:04 Stephen Rothwell
2017-12-15  2:48 Stephen Rothwell
2017-11-23  2:01 Stephen Rothwell
2017-11-13  5:54 Stephen Rothwell
2017-11-13  5:42 Stephen Rothwell
2017-11-13  8:09 ` Michal Hocko
2017-11-13  8:23   ` Michal Hocko
2017-11-13 11:43   ` Arnd Bergmann
2017-11-13 11:54     ` Michal Hocko
2017-11-13 12:24       ` Arnd Bergmann
2017-11-13 12:29       ` Michal Hocko
2017-11-16 22:44     ` Stephen Rothwell
2017-11-17  3:53       ` Stephen Rothwell
2017-11-17  9:36         ` Zhangshaokun
2017-11-17  9:56         ` Arnd Bergmann
2017-08-01  5:22 Stephen Rothwell
2017-05-26  2:43 Stephen Rothwell
2017-05-26 10:16 ` Jeff Layton
2017-05-26 11:28   ` Dave Kleikamp
2017-05-19  4:44 Stephen Rothwell
2017-02-02  6:49 Stephen Rothwell
2016-11-09  4:10 Stephen Rothwell
2016-11-09  7:18 ` Huang Shijie
2016-11-09 21:21   ` Andrew Morton
2016-11-10  2:56     ` Stephen Rothwell
2016-06-23  6:53 Stephen Rothwell
2016-06-23 14:00 ` Mel Gorman
2016-05-27  3:07 Stephen Rothwell
2016-05-27 19:53 ` Andrew Morton
2016-04-29  6:45 Stephen Rothwell
2016-04-29  6:55 ` Stephen Rothwell
2016-04-29 13:32 ` Josh Poimboeuf
2016-04-29 14:03   ` Josh Poimboeuf
2016-04-30  5:52     ` Stephen Rothwell
2015-07-16  5:26 Stephen Rothwell
2015-07-16 23:00 ` Andrew Morton
2015-06-04 12:29 Stephen Rothwell
2015-06-04 13:56 ` Andrea Arcangeli
2015-02-04  7:48 Stephen Rothwell
2015-02-04  7:53 ` Jan Kiszka
2015-01-19  7:45 Stephen Rothwell
2015-01-19 15:50 ` Chris Mason
2014-10-30  5:19 Stephen Rothwell
2014-10-30  9:00 ` Aneesh Kumar K.V
2014-09-26 10:42 Stephen Rothwell
2014-09-29 21:30 ` Andrew Morton
2014-09-08  8:57 Stephen Rothwell
2014-06-20  5:27 Stephen Rothwell
2014-06-20  5:29 ` Yinghai Lu
2014-06-16  1:57 Stephen Rothwell

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