linux-kernel - linux-next: build warning after merge of the mm-unstable tree

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Message-ID: <20250509194336.3c1baa34@canb.auug.org.au>
Date: Fri, 9 May 2025 19:43:36 +1000
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Juan Yescas <jyescas@...gle.com>, 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 mm-unstable tree

Hi all,

After merging the mm-unstable tree, today's linux-next build (powerpc64
allnoconfig) produced this warning:

In file included from include/vdso/const.h:5,
                 from include/linux/const.h:4,
                 from include/linux/bits.h:5,
                 from include/linux/ratelimit_types.h:5,
                 from include/linux/printk.h:9,
                 from include/asm-generic/bug.h:22,
                 from arch/powerpc/include/asm/bug.h:116,
                 from include/linux/bug.h:5,
                 from include/linux/mmdebug.h:5,
                 from include/linux/mm.h:6,
                 from mm/sparse.c:5:
mm/sparse.c: In function 'usemap_size':
include/linux/mmzone.h:1815:15: warning: left shift count is negative [-Wshift-count-negative]
 1815 |         ((1UL << (PFN_SECTION_SHIFT - pageblock_order)) * NR_PAGEBLOCK_BITS)
      |               ^~
include/uapi/linux/const.h:51:40: note: in definition of macro '__KERNEL_DIV_ROUND_UP'
   51 | #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
      |                                        ^
mm/sparse.c:301:16: note: in expansion of macro 'BITS_TO_LONGS'
  301 |         return BITS_TO_LONGS(SECTION_BLOCKFLAGS_BITS) * sizeof(unsigned long);
      |                ^~~~~~~~~~~~~
mm/sparse.c:301:30: note: in expansion of macro 'SECTION_BLOCKFLAGS_BITS'
  301 |         return BITS_TO_LONGS(SECTION_BLOCKFLAGS_BITS) * sizeof(unsigned long);
      |                              ^~~~~~~~~~~~~~~~~~~~~~~

Probably introduced by commit

 ("mm: add CONFIG_PAGE_BLOCK_ORDER to select page block order")

-- 
Cheers,
Stephen Rothwell

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