linux-kernel - linux-next: build warning after merge of the drm-misc tree

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Date:   Tue, 10 Nov 2020 13:29:40 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Daniel Vetter <daniel.vetter@...ll.ch>,
        Intel Graphics <intel-gfx@...ts.freedesktop.org>,
        DRI <dri-devel@...ts.freedesktop.org>
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: linux-next: build warning after merge of the drm-misc tree

Hi all,

After merging the drm-misc tree, today's linux-next build (arm
multi_v7_defconfig) produced this warning:

In file included from include/linux/kernel.h:14,
                 from include/asm-generic/bug.h:20,
                 from arch/arm/include/asm/bug.h:60,
                 from include/linux/bug.h:5,
                 from include/linux/io.h:11,
                 from include/linux/dma-buf-map.h:9,
                 from include/linux/dma-buf.h:16,
                 from drivers/gpu/drm/drm_fb_helper.c:33:
drivers/gpu/drm/drm_fb_helper.c: In function 'fb_read_screen_base':
include/linux/minmax.h:18:28: warning: comparison of distinct pointer types lacks a cast
   18 |  (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
      |                            ^~
include/linux/minmax.h:32:4: note: in expansion of macro '__typecheck'
   32 |   (__typecheck(x, y) && __no_side_effects(x, y))
      |    ^~~~~~~~~~~
include/linux/minmax.h:42:24: note: in expansion of macro '__safe_cmp'
   42 |  __builtin_choose_expr(__safe_cmp(x, y), \
      |                        ^~~~~~~~~~
include/linux/minmax.h:51:19: note: in expansion of macro '__careful_cmp'
   51 | #define min(x, y) __careful_cmp(x, y, <)
      |                   ^~~~~~~~~~~~~
drivers/gpu/drm/drm_fb_helper.c:2041:22: note: in expansion of macro 'min'
 2041 |  size_t alloc_size = min(count, PAGE_SIZE);
      |                      ^~~
drivers/gpu/drm/drm_fb_helper.c: In function 'fb_write_screen_base':
include/linux/minmax.h:18:28: warning: comparison of distinct pointer types lacks a cast
   18 |  (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
      |                            ^~
include/linux/minmax.h:32:4: note: in expansion of macro '__typecheck'
   32 |   (__typecheck(x, y) && __no_side_effects(x, y))
      |    ^~~~~~~~~~~
include/linux/minmax.h:42:24: note: in expansion of macro '__safe_cmp'
   42 |  __builtin_choose_expr(__safe_cmp(x, y), \
      |                        ^~~~~~~~~~
include/linux/minmax.h:51:19: note: in expansion of macro '__careful_cmp'
   51 | #define min(x, y) __careful_cmp(x, y, <)
      |                   ^~~~~~~~~~~~~
drivers/gpu/drm/drm_fb_helper.c:2115:22: note: in expansion of macro 'min'
 2115 |  size_t alloc_size = min(count, PAGE_SIZE);
      |                      ^~~

Introduced by commit

  222ec45f4c69 ("drm/fb_helper: Support framebuffers in I/O memory")

-- 
Cheers,
Stephen Rothwell

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