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McKenney" To: linux-kernel@vger.kernel.org Cc: mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org, Lance Roy , "Kirill A. Shutemov" , Yang Shi , Matthew Wilcox , Mel Gorman , Jan Kara , Shakeel Butt , linux-mm@kvack.org, "Paul E . McKenney" Subject: [PATCH tip/core/rcu 6/7] mm: Replace spin_is_locked() with lockdep Date: Sun, 11 Nov 2018 12:04:42 -0800 X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181111200421.GA10551@linux.ibm.com> References: <20181111200421.GA10551@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18111120-2213-0000-0000-00000315A951 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010028; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000270; SDB=6.01116026; UDB=6.00578737; IPR=6.00896126; MB=3.00024114; MTD=3.00000008; XFM=3.00000015; UTC=2018-11-11 20:04:50 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18111120-2214-0000-0000-00005C38741F Message-Id: <20181111200443.10772-6-paulmck@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-11-11_13:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=3 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=579 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1811110191 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Lance Roy lockdep_assert_held() is better suited to checking locking requirements, since it only checks if the current thread holds the lock regardless of whether someone else does. This is also a step towards possibly removing spin_is_locked(). Signed-off-by: Lance Roy Cc: Andrew Morton Cc: "Kirill A. Shutemov" Cc: Yang Shi Cc: Matthew Wilcox Cc: Mel Gorman Acked-by: Vlastimil Babka Cc: Jan Kara Cc: Shakeel Butt Cc: Signed-off-by: Paul E. McKenney --- mm/khugepaged.c | 4 ++-- mm/swap.c | 3 +-- 2 files changed, 3 insertions(+), 4 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index c13625c1ad5e..7b86600a47c9 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1225,7 +1225,7 @@ static void collect_mm_slot(struct mm_slot *mm_slot) { struct mm_struct *mm = mm_slot->mm; - VM_BUG_ON(NR_CPUS != 1 && !spin_is_locked(&khugepaged_mm_lock)); + lockdep_assert_held(&khugepaged_mm_lock); if (khugepaged_test_exit(mm)) { /* free mm_slot */ @@ -1631,7 +1631,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int progress = 0; VM_BUG_ON(!pages); - VM_BUG_ON(NR_CPUS != 1 && !spin_is_locked(&khugepaged_mm_lock)); + lockdep_assert_held(&khugepaged_mm_lock); if (khugepaged_scan.mm_slot) mm_slot = khugepaged_scan.mm_slot; diff --git a/mm/swap.c b/mm/swap.c index aa483719922e..5d786019eab9 100644 --- a/mm/swap.c +++ b/mm/swap.c @@ -823,8 +823,7 @@ void lru_add_page_tail(struct page *page, struct page *page_tail, VM_BUG_ON_PAGE(!PageHead(page), page); VM_BUG_ON_PAGE(PageCompound(page_tail), page); VM_BUG_ON_PAGE(PageLRU(page_tail), page); - VM_BUG_ON(NR_CPUS != 1 && - !spin_is_locked(&lruvec_pgdat(lruvec)->lru_lock)); + lockdep_assert_held(&lruvec_pgdat(lruvec)->lru_lock); if (!list) SetPageLRU(page_tail); -- 2.17.1