linux-kernel - Re: [PATCH 2/2] lib: add test for bitmap

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Date:   Wed, 9 Aug 2017 13:28:50 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     kbuild test robot <lkp@...el.com>
Cc:     Yury Norov <ynorov@...iumnetworks.com>, kbuild-all@...org,
        Noam Camus <noamca@...lanox.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] lib: add test for bitmap_parselist()

On Wed, 9 Aug 2017 12:11:15 +0800 kbuild test robot <lkp@...el.com> wrote:

> [auto build test WARNING on linus/master]
> [also build test WARNING on v4.13-rc4 next-20170808]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
> 
> url:    https://github.com/0day-ci/linux/commits/Yury-Norov/lib-make-bitmap_parselist-thread-safe-and-much-faster/20170809-105307
> config: xtensa-allmodconfig (attached as .config)
> compiler: xtensa-linux-gcc (GCC) 4.9.0
> reproduce:
>         wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # save the attached .config to linux build tree
>         make.cross ARCH=xtensa 
> 
> All warnings (new ones prefixed by >>):
> 
>    lib/test_bitmap.c:180:5: warning: large integer implicitly truncated to unsigned type [-Woverflow]
>         0xfffffffe, 0x3333333311111111, 0xffffffff77777777};
>         ^
>    lib/test_bitmap.c:180:5: warning: large integer implicitly truncated to unsigned type [-Woverflow]
>    lib/test_bitmap.c:181:1: warning: large integer implicitly truncated to unsigned type [-Woverflow]
>     static const unsigned long exp2[] = {0x3333333311111111, 0xffffffff77777777};
>     ^
>    lib/test_bitmap.c:181:1: warning: large integer implicitly truncated to unsigned type [-Woverflow]
>    lib/test_bitmap.c: In function 'test_bitmap_parselist':
> >> lib/test_bitmap.c:235:4: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'cycles_t' [-Wformat=]
>        pr_err("test %d: input is '%s' OK, Time: %lu\n",
>        ^

Maybe we need a %p thingy for printing cycles_t.  But this will do:

--- a/lib/test_bitmap.c~lib-add-test-for-bitmap_parselist-fix
+++ a/lib/test_bitmap.c
@@ -232,8 +232,9 @@ static void __init test_bitmap_parselist
 		}
 
 		if (ptest.flags & PARSE_TIME)
-			pr_err("test %d: input is '%s' OK, Time: %lu\n",
-					i, ptest.in, cycles);
+			pr_err("test %d: input is '%s' OK, Time: %llu\n",
+					i, ptest.in,
+					(unsigned long long)cycles);
 	}
 }
 
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