linux-kernel - linux-next: build warning after merge of the akpm-current tree

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Message-ID: <20200305163743.7128c251@canb.auug.org.au>
Date:   Thu, 5 Mar 2020 16:37:43 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Walter Wu <walter-zh.wu@...iatek.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>
Subject: linux-next: build warning after merge of the akpm-current tree

Hi all,

After merging the akpm-current tree, today's linux-next build (x86_64
allmodconfig) produced this warning:

mm/kasan/common.o: warning: objtool: kasan_report()+0x17: call to report_enabled() with UACCESS enabled
In file included from include/linux/bitmap.h:9,
                 from include/linux/cpumask.h:12,
                 from arch/x86/include/asm/paravirt.h:17,
                 from arch/x86/include/asm/irqflags.h:72,
                 from include/linux/irqflags.h:16,
                 from include/linux/rcupdate.h:26,
                 from include/linux/rculist.h:11,
                 from include/linux/pid.h:5,
                 from include/linux/sched.h:14,
                 from include/linux/uaccess.h:6,
                 from arch/x86/include/asm/fpu/xstate.h:5,
                 from arch/x86/include/asm/pgtable.h:26,
                 from include/linux/kasan.h:15,
                 from lib/test_kasan.c:12:
In function 'memmove',
    inlined from 'kmalloc_memmove_invalid_size' at lib/test_kasan.c:301:2:
include/linux/string.h:441:9: warning: '__builtin_memmove' specified bound 18446744073709551614 exceeds maximum object size 9223372036854775807 [-Wstringop-overflow=]
  441 |  return __builtin_memmove(p, q, size);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Introduced by commit

  519e500fac64 ("kasan: add test for invalid size in memmove")

That's a bit annoying during a normal x86_64 allmodconfig build ...

-- 
Cheers,
Stephen Rothwell

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