Messages in this thread | | | Date | Wed, 1 Apr 2020 15:58:31 -0700 | From | Andrew Morton <> | Subject | Re: linux-next: build warning after merge of the akpm-current tree |
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On Tue, 31 Mar 2020 19:56:12 +1100 Stephen Rothwell <sfr@canb.auug.org.au> wrote:
> Hi all, > > After merging the akpm-current tree, today's linux-next build (i386 > defconfig) produced this warning: > > mm/hugetlb.c: In function 'huge_pte_offset': > cc1: warning: function may return address of local variable [-Wreturn-local-addr] > mm/hugetlb.c:5361:14: note: declared here > 5361 | pud_t *pud, pud_entry; > | ^~~~~~~~~ > cc1: warning: function may return address of local variable [-Wreturn-local-addr] > mm/hugetlb.c:5360:14: note: declared here > 5360 | p4d_t *p4d, p4d_entry; > | ^~~~~~~~~ > > Introduced by commit > > 826ddc88e2cf ("mm/hugetlb: fix a addressing exception caused by huge_pte_offset")
I can reproduce this (i386 defconfig, gcc-7.2.0).
I can see no way in which this makes any sense. Hopefully it's a gcc bug but it's hard to see how it could have messed up this fairly simple code.
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