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Howlett" To: maple-tree@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Andrew Morton , Song Liu , Davidlohr Bueso , "Paul E . McKenney" , Matthew Wilcox , Jerome Glisse , David Rientjes , Axel Rasmussen , Suren Baghdasaryan , Vlastimil Babka , Rik van Riel , Peter Zijlstra Subject: [PATCH v2 46/70] ipc/shm: Stop using the vma linked list Date: Tue, 12 Jan 2021 11:12:16 -0500 Message-Id: <20210112161240.2024684-47-Liam.Howlett@Oracle.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20210112161240.2024684-1-Liam.Howlett@Oracle.com> References: <20210112161240.2024684-1-Liam.Howlett@Oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9862 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 mlxlogscore=999 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101120092 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9862 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 suspectscore=0 clxscore=1015 impostorscore=0 spamscore=0 priorityscore=1501 mlxscore=0 phishscore=0 mlxlogscore=999 bulkscore=0 adultscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101120092 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: When searching for a VMA, a maple state can be used instead of the linked= list in the mm_struct Signed-off-by: Liam R. Howlett --- ipc/shm.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/ipc/shm.c b/ipc/shm.c index e25c7c6106bcf..4ad8788352099 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -1631,6 +1631,7 @@ long ksys_shmdt(char __user *shmaddr) loff_t size =3D 0; struct file *file; struct vm_area_struct *next; + MA_STATE(mas, &mm->mm_mt, addr, addr); #endif =20 if (addr & ~PAGE_MASK) @@ -1660,11 +1661,11 @@ long ksys_shmdt(char __user *shmaddr) * match the usual checks anyway. So assume all vma's are * above the starting address given. */ - vma =3D find_vma(mm, addr); =20 #ifdef CONFIG_MMU + vma =3D mas_find(&mas, ULONG_MAX); while (vma) { - next =3D vma->vm_next; + next =3D mas_find(&mas, ULONG_MAX); =20 /* * Check if the starting address would match, i.e. it's @@ -1703,21 +1704,21 @@ long ksys_shmdt(char __user *shmaddr) */ size =3D PAGE_ALIGN(size); while (vma && (loff_t)(vma->vm_end - addr) <=3D size) { - next =3D vma->vm_next; - /* finding a matching vma now does not alter retval */ if ((vma->vm_ops =3D=3D &shm_vm_ops) && ((vma->vm_start - addr)/PAGE_SIZE =3D=3D vma->vm_pgoff) && (vma->vm_file =3D=3D file)) do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start, NULL); - vma =3D next; + + vma =3D mas_find(&mas, addr + size - 1); } =20 #else /* CONFIG_MMU */ + vma =3D mas_walk(&mas); /* under NOMMU conditions, the exact address to be destroyed must be * given */ - if (vma && vma->vm_start =3D=3D addr && vma->vm_ops =3D=3D &shm_vm_ops)= { + if (vma && vma->vm_ops =3D=3D &shm_vm_ops) { do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start, NULL); retval =3D 0; } --=20 2.28.0