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Date: Wed, 31 Jan 2018 07:49:04 +0800
From: kbuild test robot <lkp@...el.com>
To: Mike Kravetz <mike.kravetz@...cle.com>
Cc: kbuild-all@...org, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, Hugh Dickins <hughd@...gle.com>,
Andrea Arcangeli <aarcange@...hat.com>,
Michal Hocko <mhocko@...nel.org>,
Marc-André Lureau <marcandre.lureau@...il.com>,
David Herrmann <dh.herrmann@...il.com>,
Khalid Aziz <khalid.aziz@...cle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Mike Kravetz <mike.kravetz@...cle.com>
Subject: Re: [PATCH 3/3] mm: memfd: remove memfd code from shmem files and
use new memfd files
Hi Mike,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on mmotm/master]
[also build test WARNING on next-20180126]
[cannot apply to linus/master v4.15]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Mike-Kravetz/restructure-memfd-code/20180131-023405
base: git://git.cmpxchg.org/linux-mmotm.git master
reproduce:
# apt-get install sparse
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__
sparse warnings: (new ones prefixed by >>)
>> mm/memfd.c:40:9: sparse: incorrect type in assignment (different address spaces) @@ expected void @@ got void <avoid @@
mm/memfd.c:40:9: expected void
mm/memfd.c:40:9: got void
>> mm/memfd.c:40:9: sparse: incorrect type in assignment (different address spaces) @@ expected void @@ got void <avoid @@
mm/memfd.c:40:9: expected void
mm/memfd.c:40:9: got void
>> mm/memfd.c:41:46: sparse: incorrect type in argument 1 (different address spaces) @@ expected void @@ got @@
mm/memfd.c:41:46: expected void
mm/memfd.c:41:46: got void
mm/memfd.c:44:38: sparse: incorrect type in assignment (different address spaces) @@ expected void @@ got void <avoid @@
mm/memfd.c:44:38: expected void
mm/memfd.c:44:38: got void
mm/memfd.c:55:55: sparse: incorrect type in argument 1 (different address spaces) @@ expected void @@ got @@
mm/memfd.c:55:55: expected void
mm/memfd.c:55:55: got void
mm/memfd.c:55:30: sparse: incorrect type in assignment (different address spaces) @@ expected void @@ got void <avoid @@
mm/memfd.c:55:30: expected void
mm/memfd.c:55:30: got void
mm/memfd.c:40:9: sparse: incorrect type in argument 1 (different address spaces) @@ expected void @@ got @@
mm/memfd.c:40:9: expected void
mm/memfd.c:40:9: got void
>> mm/memfd.c:40:9: sparse: incorrect type in assignment (different address spaces) @@ expected void @@ got void <avoid @@
mm/memfd.c:40:9: expected void
mm/memfd.c:40:9: got void
mm/memfd.c:93:17: sparse: incorrect type in assignment (different address spaces) @@ expected void @@ got void <avoid @@
mm/memfd.c:93:17: expected void
mm/memfd.c:93:17: got void
mm/memfd.c:93:17: sparse: incorrect type in assignment (different address spaces) @@ expected void @@ got void <avoid @@
mm/memfd.c:93:17: expected void
mm/memfd.c:93:17: got void
mm/memfd.c:96:54: sparse: incorrect type in argument 1 (different address spaces) @@ expected void @@ got @@
mm/memfd.c:96:54: expected void
mm/memfd.c:96:54: got void
mm/memfd.c:99:46: sparse: incorrect type in assignment (different address spaces) @@ expected void @@ got void <avoid @@
mm/memfd.c:99:46: expected void
mm/memfd.c:99:46: got void
mm/memfd.c:125:63: sparse: incorrect type in argument 1 (different address spaces) @@ expected void @@ got @@
mm/memfd.c:125:63: expected void
mm/memfd.c:125:63: got void
mm/memfd.c:125:38: sparse: incorrect type in assignment (different address spaces) @@ expected void @@ got void <avoid @@
mm/memfd.c:125:38: expected void
mm/memfd.c:125:38: got void
mm/memfd.c:93:17: sparse: incorrect type in argument 1 (different address spaces) @@ expected void @@ got @@
mm/memfd.c:93:17: expected void
mm/memfd.c:93:17: got void
mm/memfd.c:93:17: sparse: incorrect type in assignment (different address spaces) @@ expected void @@ got void <avoid @@
mm/memfd.c:93:17: expected void
mm/memfd.c:93:17: got void
vim +40 mm/memfd.c
6df4ed2a41 Mike Kravetz 2018-01-29 28
6df4ed2a41 Mike Kravetz 2018-01-29 29 static void shmem_tag_pins(struct address_space *mapping)
6df4ed2a41 Mike Kravetz 2018-01-29 30 {
6df4ed2a41 Mike Kravetz 2018-01-29 31 struct radix_tree_iter iter;
6df4ed2a41 Mike Kravetz 2018-01-29 32 void **slot;
6df4ed2a41 Mike Kravetz 2018-01-29 33 pgoff_t start;
6df4ed2a41 Mike Kravetz 2018-01-29 34 struct page *page;
6df4ed2a41 Mike Kravetz 2018-01-29 35
6df4ed2a41 Mike Kravetz 2018-01-29 36 lru_add_drain();
6df4ed2a41 Mike Kravetz 2018-01-29 37 start = 0;
6df4ed2a41 Mike Kravetz 2018-01-29 38 rcu_read_lock();
6df4ed2a41 Mike Kravetz 2018-01-29 39
6df4ed2a41 Mike Kravetz 2018-01-29 @40 radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, start) {
6df4ed2a41 Mike Kravetz 2018-01-29 @41 page = radix_tree_deref_slot(slot);
6df4ed2a41 Mike Kravetz 2018-01-29 42 if (!page || radix_tree_exception(page)) {
6df4ed2a41 Mike Kravetz 2018-01-29 43 if (radix_tree_deref_retry(page)) {
6df4ed2a41 Mike Kravetz 2018-01-29 44 slot = radix_tree_iter_retry(&iter);
6df4ed2a41 Mike Kravetz 2018-01-29 45 continue;
6df4ed2a41 Mike Kravetz 2018-01-29 46 }
6df4ed2a41 Mike Kravetz 2018-01-29 47 } else if (page_count(page) - page_mapcount(page) > 1) {
6df4ed2a41 Mike Kravetz 2018-01-29 48 spin_lock_irq(&mapping->tree_lock);
6df4ed2a41 Mike Kravetz 2018-01-29 49 radix_tree_tag_set(&mapping->page_tree, iter.index,
6df4ed2a41 Mike Kravetz 2018-01-29 50 SHMEM_TAG_PINNED);
6df4ed2a41 Mike Kravetz 2018-01-29 51 spin_unlock_irq(&mapping->tree_lock);
6df4ed2a41 Mike Kravetz 2018-01-29 52 }
6df4ed2a41 Mike Kravetz 2018-01-29 53
6df4ed2a41 Mike Kravetz 2018-01-29 54 if (need_resched()) {
6df4ed2a41 Mike Kravetz 2018-01-29 55 slot = radix_tree_iter_resume(slot, &iter);
6df4ed2a41 Mike Kravetz 2018-01-29 56 cond_resched_rcu();
6df4ed2a41 Mike Kravetz 2018-01-29 57 }
6df4ed2a41 Mike Kravetz 2018-01-29 58 }
6df4ed2a41 Mike Kravetz 2018-01-29 59 rcu_read_unlock();
6df4ed2a41 Mike Kravetz 2018-01-29 60 }
6df4ed2a41 Mike Kravetz 2018-01-29 61
:::::: The code at line 40 was first introduced by commit
:::::: 6df4ed2a410bc04f1ec04dce16ccd236707f7f32 mm: memfd: split out memfd for use by multiple filesystems
:::::: TO: Mike Kravetz <mike.kravetz@...cle.com>
:::::: CC: 0day robot <fengguang.wu@...el.com>
---
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