* [ammarfaizi2-block:akpm/mm/mm-unstable 160/254] mm/rmap.c:1325 page_add_anon_rmap() error: uninitialized symbol 'first'.
@ 2022-11-21 10:47 Dan Carpenter
2022-11-21 19:44 ` Andrew Morton
0 siblings, 1 reply; 4+ messages in thread
From: Dan Carpenter @ 2022-11-21 10:47 UTC (permalink / raw)
To: oe-kbuild, Hugh Dickins
Cc: lkp, oe-kbuild-all, Ammar Faizi, GNU/Weeb Mailing List,
Andrew Morton, Linux Memory Management List
tree: https://github.com/ammarfaizi2/linux-block akpm/mm/mm-unstable
head: a8da2493d983a10242e6c9d71c6e828aafa5baf8
commit: d68dde0dc6f8b8d09357a32473db8881173b10b0 [160/254] mm,thp,rmap: subpages_mapcount of PTE-mapped subpages
config: i386-randconfig-m021
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <[email protected]>
| Reported-by: Dan Carpenter <[email protected]>
smatch warnings:
mm/rmap.c:1325 page_add_anon_rmap() error: uninitialized symbol 'first'.
vim +/first +1325 mm/rmap.c
9617d95e6e9ffd Nicholas Piggin 2006-01-06 1278 void page_add_anon_rmap(struct page *page,
14f9135d547060 David Hildenbrand 2022-05-09 1279 struct vm_area_struct *vma, unsigned long address, rmap_t flags)
9617d95e6e9ffd Nicholas Piggin 2006-01-06 1280 {
5b3276bc4a2e01 Hugh Dickins 2022-11-02 1281 struct compound_mapcounts mapcounts;
5b3276bc4a2e01 Hugh Dickins 2022-11-02 1282 int nr = 0, nr_pmdmapped = 0;
d281ee61451835 Kirill A. Shutemov 2016-01-15 1283 bool compound = flags & RMAP_COMPOUND;
53f9263baba69f Kirill A. Shutemov 2016-01-15 1284 bool first;
^^^^^^^^^^
53f9263baba69f Kirill A. Shutemov 2016-01-15 1285
be5d0a74c62d8d Johannes Weiner 2020-06-03 1286 if (unlikely(PageKsm(page)))
be5d0a74c62d8d Johannes Weiner 2020-06-03 1287 lock_page_memcg(page);
be5d0a74c62d8d Johannes Weiner 2020-06-03 1288
d68dde0dc6f8b8 Hugh Dickins 2022-11-18 1289 if (likely(!compound /* page is mapped by PTE */)) {
84e6cb5a201a85 Hugh Dickins 2022-11-09 1290 first = atomic_inc_and_test(&page->_mapcount);
84e6cb5a201a85 Hugh Dickins 2022-11-09 1291 nr = first;
d68dde0dc6f8b8 Hugh Dickins 2022-11-18 1292 if (first && PageCompound(page)) {
d68dde0dc6f8b8 Hugh Dickins 2022-11-18 1293 struct page *head = compound_head(page);
d68dde0dc6f8b8 Hugh Dickins 2022-11-18 1294
d68dde0dc6f8b8 Hugh Dickins 2022-11-18 1295 lock_compound_mapcounts(head, &mapcounts);
d68dde0dc6f8b8 Hugh Dickins 2022-11-18 1296 mapcounts.subpages_mapcount++;
d68dde0dc6f8b8 Hugh Dickins 2022-11-18 1297 nr = !mapcounts.compound_mapcount;
d68dde0dc6f8b8 Hugh Dickins 2022-11-18 1298 unlock_compound_mapcounts(head, &mapcounts);
d68dde0dc6f8b8 Hugh Dickins 2022-11-18 1299 }
d68dde0dc6f8b8 Hugh Dickins 2022-11-18 1300 } else if (PageTransHuge(page)) {
d68dde0dc6f8b8 Hugh Dickins 2022-11-18 1301 /* That test is redundant: it's for safety or to optimize out */
84e6cb5a201a85 Hugh Dickins 2022-11-09 1302
5b3276bc4a2e01 Hugh Dickins 2022-11-02 1303 lock_compound_mapcounts(page, &mapcounts);
5b3276bc4a2e01 Hugh Dickins 2022-11-02 1304 first = !mapcounts.compound_mapcount;
5b3276bc4a2e01 Hugh Dickins 2022-11-02 1305 mapcounts.compound_mapcount++;
5b3276bc4a2e01 Hugh Dickins 2022-11-02 1306 if (first) {
d68dde0dc6f8b8 Hugh Dickins 2022-11-18 1307 nr_pmdmapped = thp_nr_pages(page);
d68dde0dc6f8b8 Hugh Dickins 2022-11-18 1308 nr = nr_pmdmapped - mapcounts.subpages_mapcount;
5b3276bc4a2e01 Hugh Dickins 2022-11-02 1309 }
5b3276bc4a2e01 Hugh Dickins 2022-11-02 1310 unlock_compound_mapcounts(page, &mapcounts);
53f9263baba69f Kirill A. Shutemov 2016-01-15 1311 }
No else path.
bde3d57e6cec9c Hugh Dickins 2022-11-02 1312
6c287605fd5646 David Hildenbrand 2022-05-09 1313 VM_BUG_ON_PAGE(!first && (flags & RMAP_EXCLUSIVE), page);
^^^^^
Uninitialized.
6c287605fd5646 David Hildenbrand 2022-05-09 1314 VM_BUG_ON_PAGE(!first && PageAnonExclusive(page), page);
53f9263baba69f Kirill A. Shutemov 2016-01-15 1315
5b3276bc4a2e01 Hugh Dickins 2022-11-02 1316 if (nr_pmdmapped)
5b3276bc4a2e01 Hugh Dickins 2022-11-02 1317 __mod_lruvec_page_state(page, NR_ANON_THPS, nr_pmdmapped);
5b3276bc4a2e01 Hugh Dickins 2022-11-02 1318 if (nr)
be5d0a74c62d8d Johannes Weiner 2020-06-03 1319 __mod_lruvec_page_state(page, NR_ANON_MAPPED, nr);
5ad6468801d28c Hugh Dickins 2009-12-14 1320
cea86fe246b694 Hugh Dickins 2022-02-14 1321 if (unlikely(PageKsm(page)))
be5d0a74c62d8d Johannes Weiner 2020-06-03 1322 unlock_page_memcg(page);
53f9263baba69f Kirill A. Shutemov 2016-01-15 1323
5dbe0af47f8a8f Hugh Dickins 2011-05-28 1324 /* address might be in next vma when migration races vma_adjust */
cea86fe246b694 Hugh Dickins 2022-02-14 @1325 else if (first)
d281ee61451835 Kirill A. Shutemov 2016-01-15 1326 __page_set_anon_rmap(page, vma, address,
14f9135d547060 David Hildenbrand 2022-05-09 1327 !!(flags & RMAP_EXCLUSIVE));
69029cd550284e KAMEZAWA Hiroyuki 2008-07-25 1328 else
c97a9e10eaee32 Nicholas Piggin 2007-05-16 1329 __page_check_anon_rmap(page, vma, address);
cea86fe246b694 Hugh Dickins 2022-02-14 1330
cea86fe246b694 Hugh Dickins 2022-02-14 1331 mlock_vma_page(page, vma, compound);
^1da177e4c3f41 Linus Torvalds 2005-04-16 1332 }
--
0-DAY CI Kernel Test Service
https://01.org/lkp
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [ammarfaizi2-block:akpm/mm/mm-unstable 160/254] mm/rmap.c:1325 page_add_anon_rmap() error: uninitialized symbol 'first'.
2022-11-21 10:47 [ammarfaizi2-block:akpm/mm/mm-unstable 160/254] mm/rmap.c:1325 page_add_anon_rmap() error: uninitialized symbol 'first' Dan Carpenter
@ 2022-11-21 19:44 ` Andrew Morton
2022-11-21 20:12 ` Hugh Dickins
0 siblings, 1 reply; 4+ messages in thread
From: Andrew Morton @ 2022-11-21 19:44 UTC (permalink / raw)
To: Dan Carpenter
Cc: oe-kbuild, Hugh Dickins, lkp, oe-kbuild-all, Ammar Faizi,
GNU/Weeb Mailing List, Linux Memory Management List
On Mon, 21 Nov 2022 13:47:02 +0300 Dan Carpenter <[email protected]> wrote:
> tree: https://github.com/ammarfaizi2/linux-block akpm/mm/mm-unstable
> head: a8da2493d983a10242e6c9d71c6e828aafa5baf8
> commit: d68dde0dc6f8b8d09357a32473db8881173b10b0 [160/254] mm,thp,rmap: subpages_mapcount of PTE-mapped subpages
> config: i386-randconfig-m021
> compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
>
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <[email protected]>
> | Reported-by: Dan Carpenter <[email protected]>
>
> smatch warnings:
> mm/rmap.c:1325 page_add_anon_rmap() error: uninitialized symbol 'first'.
>
Thanks. Hugh's looking into this.
https://lkml.kernel.org/r/[email protected]
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [ammarfaizi2-block:akpm/mm/mm-unstable 160/254] mm/rmap.c:1325 page_add_anon_rmap() error: uninitialized symbol 'first'.
2022-11-21 19:44 ` Andrew Morton
@ 2022-11-21 20:12 ` Hugh Dickins
2022-11-22 7:08 ` Dan Carpenter
0 siblings, 1 reply; 4+ messages in thread
From: Hugh Dickins @ 2022-11-21 20:12 UTC (permalink / raw)
To: Andrew Morton
Cc: Dan Carpenter, oe-kbuild, Hugh Dickins, lkp, oe-kbuild-all,
Ammar Faizi, GNU/Weeb Mailing List, Linux Memory Management List
On Mon, 21 Nov 2022, Andrew Morton wrote:
> On Mon, 21 Nov 2022 13:47:02 +0300 Dan Carpenter <[email protected]> wrote:
>
> > tree: https://github.com/ammarfaizi2/linux-block akpm/mm/mm-unstable
> > head: a8da2493d983a10242e6c9d71c6e828aafa5baf8
> > commit: d68dde0dc6f8b8d09357a32473db8881173b10b0 [160/254] mm,thp,rmap: subpages_mapcount of PTE-mapped subpages
> > config: i386-randconfig-m021
> > compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
> >
> > If you fix the issue, kindly add following tag where applicable
> > | Reported-by: kernel test robot <[email protected]>
> > | Reported-by: Dan Carpenter <[email protected]>
> >
> > smatch warnings:
> > mm/rmap.c:1325 page_add_anon_rmap() error: uninitialized symbol 'first'.
> >
>
> Thanks. Hugh's looking into this.
> https://lkml.kernel.org/r/[email protected]
Yes, thanks Dan: Yu Zhao already reported, the fix I sent was
https://lore.kernel.org/linux-mm/[email protected]/
but it hasn't got into mm-unstable yet.
I've not yet digested Kirill's review comments on the series (no functional
change required, I believe): maybe they will call for a v2 rather than a
series of -fixes; but let's add the above in for now.
Thanks,
Hugh
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [ammarfaizi2-block:akpm/mm/mm-unstable 160/254] mm/rmap.c:1325 page_add_anon_rmap() error: uninitialized symbol 'first'.
2022-11-21 20:12 ` Hugh Dickins
@ 2022-11-22 7:08 ` Dan Carpenter
0 siblings, 0 replies; 4+ messages in thread
From: Dan Carpenter @ 2022-11-22 7:08 UTC (permalink / raw)
To: Hugh Dickins
Cc: Andrew Morton, oe-kbuild, lkp, oe-kbuild-all, Ammar Faizi,
GNU/Weeb Mailing List, Linux Memory Management List
On Mon, Nov 21, 2022 at 12:12:12PM -0800, Hugh Dickins wrote:
> On Mon, 21 Nov 2022, Andrew Morton wrote:
> > On Mon, 21 Nov 2022 13:47:02 +0300 Dan Carpenter <[email protected]> wrote:
> >
> > > tree: https://github.com/ammarfaizi2/linux-block akpm/mm/mm-unstable
> > > head: a8da2493d983a10242e6c9d71c6e828aafa5baf8
> > > commit: d68dde0dc6f8b8d09357a32473db8881173b10b0 [160/254] mm,thp,rmap: subpages_mapcount of PTE-mapped subpages
> > > config: i386-randconfig-m021
> > > compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
> > >
> > > If you fix the issue, kindly add following tag where applicable
> > > | Reported-by: kernel test robot <[email protected]>
> > > | Reported-by: Dan Carpenter <[email protected]>
> > >
> > > smatch warnings:
> > > mm/rmap.c:1325 page_add_anon_rmap() error: uninitialized symbol 'first'.
> > >
> >
> > Thanks. Hugh's looking into this.
> > https://lkml.kernel.org/r/[email protected]
>
> Yes, thanks Dan: Yu Zhao already reported, the fix I sent was
>
> https://lore.kernel.org/linux-mm/[email protected]/
>
> but it hasn't got into mm-unstable yet.
Ah good. I did check lore before sending the bug report but I only
looked at the subjects and senders instead of reading the emails.
regards,
dan carpenter
^ permalink raw reply [flat|nested] 4+ messages in thread
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2022-11-21 10:47 [ammarfaizi2-block:akpm/mm/mm-unstable 160/254] mm/rmap.c:1325 page_add_anon_rmap() error: uninitialized symbol 'first' Dan Carpenter
2022-11-21 19:44 ` Andrew Morton
2022-11-21 20:12 ` Hugh Dickins
2022-11-22 7:08 ` Dan Carpenter
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