linux-kernel - linux-next: build failure after merge of the bitmap tree

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Message-ID: <20220502181512.4b42ffc6@canb.auug.org.au>
Date:   Mon, 2 May 2022 18:15:12 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Yury Norov <yury.norov@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: linux-next: build failure after merge of the bitmap tree

Hi all,

After merging the bitmap tree, today's linux-next build (native perf)
failed like this:

../lib/bitmap.c:21:5: error: conflicting types for '__bitmap_weight_cmp'; have 'int(const long unsigned int *, unsigned int,  int)'
   21 | int __bitmap_weight_cmp(const unsigned long *bitmap, unsigned int bits, int num)
      |     ^~~~~~~~~~~~~~~~~~~
In file included from ../lib/bitmap.c:6:
tools/include/linux/bitmap.h:15:5: note: previous declaration of '__bitmap_weight_cmp' with type 'int(const long unsigned int *, unsigned int,  unsigned int)'
   15 | int __bitmap_weight_cmp(const unsigned long *bitmap, unsigned int bits,
      |     ^~~~~~~~~~~~~~~~~~~
../lib/bitmap.c: In function '__bitmap_weight_cmp':
../lib/bitmap.c:26:50: error: comparison of integer expressions of different signedness: 'unsigned int' and 'int' [-Werror=sign-compare]
   26 |                 if (w + bits - k * BITS_PER_LONG < num)
      |                                                  ^
../lib/bitmap.c:31:23: error: comparison of integer expressions of different signedness: 'unsigned int' and 'int' [-Werror=sign-compare]
   31 |                 if (w > num)
      |                       ^
cc1: all warnings being treated as errors
tools/perf/../lib/bitmap.c:21:5: error: conflicting types for '__bitmap_weight_cmp'; have 'int(const long unsigned int *, unsigned int,  int)'
   21 | int __bitmap_weight_cmp(const unsigned long *bitmap, unsigned int bits, int num)
      |     ^~~~~~~~~~~~~~~~~~~
In file included from tools/perf/../lib/bitmap.c:6:
tools/include/linux/bitmap.h:15:5: note: previous declaration of '__bitmap_weight_cmp' with type 'int(const long unsigned int *, unsigned int,  unsigned int)'
   15 | int __bitmap_weight_cmp(const unsigned long *bitmap, unsigned int bits,
      |     ^~~~~~~~~~~~~~~~~~~
tools/perf/../lib/bitmap.c: In function '__bitmap_weight_cmp':
tools/perf/../lib/bitmap.c:26:50: error: comparison of integer expressions of different signedness: 'unsigned int' and 'int' [-Werror=sign-compare]
   26 |                 if (w + bits - k * BITS_PER_LONG < num)
      |                                                  ^
tools/perf/../lib/bitmap.c:31:23: error: comparison of integer expressions of different signedness: 'unsigned int' and 'int' [-Werror=sign-compare]
   31 |                 if (w > num)
      |                       ^
cc1: all warnings being treated as errors

Probably caused by commit

  4252f3915e02 ("tools: bitmap: sync bitmap_weight")

I have used the bitmap tree from next-20220429 for today.

-- 
Cheers,
Stephen Rothwell

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