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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 24/70] mmap: Remove __do_munmap() in favour of do_mas_munmap() Date: Tue, 12 Jan 2021 11:11:54 -0500 Message-Id: <20210112161240.2024684-25-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 adultscore=0 suspectscore=0 spamscore=0 mlxlogscore=996 malwarescore=0 bulkscore=0 mlxscore=0 phishscore=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-2101120093 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: Export new interface and use it in place of old interface. Signed-off-by: Liam R. Howlett --- include/linux/mm.h | 4 ++-- mm/mmap.c | 16 ++++------------ mm/mremap.c | 7 ++++--- 3 files changed, 10 insertions(+), 17 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 996353a057500..680dcfe07dbb6 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2573,8 +2573,8 @@ extern unsigned long mmap_region(struct file *file,= unsigned long addr, extern unsigned long do_mmap(struct file *file, unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long pgoff, unsigned long *populate, struct list_head *uf); -extern int __do_munmap(struct mm_struct *, unsigned long, size_t, - struct list_head *uf, bool downgrade); +extern int do_mas_munmap(struct ma_state *mas, struct mm_struct *mm, + unsigned long start, size_t len, struct list_head *uf, bool downgrade)= ; extern int do_munmap(struct mm_struct *, unsigned long, size_t, struct list_head *uf); extern int do_madvise(struct mm_struct *mm, unsigned long start, size_t = len_in, int behavior); diff --git a/mm/mmap.c b/mm/mmap.c index c0a64c4726b67..9be91b47db6b4 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2555,13 +2555,6 @@ int do_mas_align_munmap(struct ma_state *mas, stru= ct vm_area_struct *vma, return downgrade ? 1 : 0; } =20 -int __do_munmap(struct mm_struct *mm, unsigned long start, size_t len, - struct list_head *uf, bool downgrade) -{ - MA_STATE(mas, &mm->mm_mt, start, start); - return do_mas_munmap(&mas, mm, start, len, uf, downgrade); -} - /* * do_mas_munmap() - munmap a given range. * @mas: The maple state @@ -2610,7 +2603,8 @@ int do_mas_munmap(struct ma_state *mas, struct mm_s= truct *mm, int do_munmap(struct mm_struct *mm, unsigned long start, size_t len, struct list_head *uf) { - return __do_munmap(mm, start, len, uf, false); + MA_STATE(mas, &mm->mm_mt, start, start); + return do_mas_munmap(&mas, mm, start, len, uf, false); } =20 unsigned long mmap_region(struct file *file, unsigned long addr, @@ -2858,11 +2852,12 @@ static int __vm_munmap(unsigned long start, size_= t len, bool downgrade) int ret; struct mm_struct *mm =3D current->mm; LIST_HEAD(uf); + MA_STATE(mas, &mm->mm_mt, start, start); =20 if (mmap_write_lock_killable(mm)) return -EINTR; =20 - ret =3D __do_munmap(mm, start, len, &uf, downgrade); + ret =3D do_mas_munmap(&mas, mm, start, len, &uf, downgrade); /* * Returning 1 indicates mmap_lock is downgraded. * But 1 is not legal return value of vm_munmap() and munmap(), reset @@ -3014,9 +3009,6 @@ static int do_brk_munmap(struct ma_state *mas, stru= ct vm_area_struct *vma, arch_unmap(mm, newbrk, oldbrk); =20 if (likely(vma->vm_start >=3D newbrk)) { // remove entire mapping(s) - mas_set(mas, newbrk); - if (vma->vm_start !=3D newbrk) - mas_reset(mas); // cause a re-walk for the first overlap. ret =3D do_mas_munmap(mas, mm, newbrk, oldbrk-newbrk, uf, true); goto munmap_full_vma; } diff --git a/mm/mremap.c b/mm/mremap.c index 138abbae4f758..a7526a8c1fe5a 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -723,14 +723,15 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsign= ed long, old_len, /* * Always allow a shrinking remap: that just unmaps * the unnecessary pages.. - * __do_munmap does all the needed commit accounting, and + * do_mas_munmap does all the needed commit accounting, and * downgrades mmap_lock to read if so directed. */ if (old_len >=3D new_len) { int retval; + MA_STATE(mas, &mm->mm_mt, addr + new_len, addr + new_len); =20 - retval =3D __do_munmap(mm, addr+new_len, old_len - new_len, - &uf_unmap, true); + retval =3D do_mas_munmap(&mas, mm, addr + new_len, + old_len - new_len, &uf_unmap, true); if (retval < 0 && old_len !=3D new_len) { ret =3D retval; goto out; --=20 2.28.0