From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>
To: maple-tree@lists.infradead.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@google.com>, Song Liu <songliubraving@fb.com>,
Davidlohr Bueso <dave@stgolabs.net>,
"Paul E . McKenney" <paulmck@kernel.org>,
Matthew Wilcox <willy@infradead.org>,
Jerome Glisse <jglisse@redhat.com>,
David Rientjes <rientjes@google.com>,
Axel Rasmussen <axelrasmussen@google.com>,
Suren Baghdasaryan <surenb@google.com>,
Vlastimil Babka <vbabka@suse.cz>
Subject: [PATCH 25/28] mmap: Remove __do_munmap() in favour of do_mas_munmap()
Date: Thu, 10 Dec 2020 12:03:59 -0500 [thread overview]
Message-ID: <20201210170402.3468568-26-Liam.Howlett@Oracle.com> (raw)
In-Reply-To: <20201210170402.3468568-1-Liam.Howlett@Oracle.com>
Export new interface and use it in place of old interface.
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---
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 93166e22c988f..9f88e2b269406 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 48ab40a90428b..36a6b03193eb3 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2543,13 +2543,6 @@ int do_mas_align_munmap(struct ma_state *mas, struct vm_area_struct *vma,
return downgrade ? 1 : 0;
}
-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
@@ -2598,7 +2591,8 @@ int do_mas_munmap(struct ma_state *mas, struct mm_struct *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);
}
unsigned long mmap_region(struct file *file, unsigned long addr,
@@ -2846,11 +2840,12 @@ static int __vm_munmap(unsigned long start, size_t len, bool downgrade)
int ret;
struct mm_struct *mm = current->mm;
LIST_HEAD(uf);
+ MA_STATE(mas, &mm->mm_mt, start, start);
if (mmap_write_lock_killable(mm))
return -EINTR;
- ret = __do_munmap(mm, start, len, &uf, downgrade);
+ ret = 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
@@ -3002,9 +2997,6 @@ static int do_brk_munmap(struct ma_state *mas, struct vm_area_struct *vma,
arch_unmap(mm, newbrk, oldbrk);
if (likely(vma->vm_start >= newbrk)) { // remove entire mapping(s)
- mas_set(mas, newbrk);
- if (vma->vm_start != newbrk)
- mas_reset(mas); // cause a re-walk for the first overlap.
ret = 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, unsigned 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 >= new_len) {
int retval;
+ MA_STATE(mas, &mm->mm_mt, addr + new_len, addr + new_len);
- retval = __do_munmap(mm, addr+new_len, old_len - new_len,
- &uf_unmap, true);
+ retval = do_mas_munmap(&mas, mm, addr + new_len,
+ old_len - new_len, &uf_unmap, true);
if (retval < 0 && old_len != new_len) {
ret = retval;
goto out;
--
2.28.0
next prev parent reply other threads:[~2020-12-10 18:20 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-10 17:03 [PATCH 00/28] RFC mm: Introducing the Maple Tree Liam R. Howlett
2020-12-10 17:03 ` [PATCH 01/28] radix tree test suite: Enhancements for " Liam R. Howlett
2020-12-10 17:03 ` [PATCH 02/28] radix tree test suite: Add support for fallthrough attribute Liam R. Howlett
2020-12-10 17:03 ` [PATCH 03/28] radix tree test suite: Add support for kmem_cache_free_bulk Liam R. Howlett
2020-12-10 17:03 ` [PATCH 04/28] radix tree test suite: Add keme_cache_alloc_bulk() support Liam R. Howlett
2020-12-10 17:03 ` [PATCH 05/28] Maple Tree: Add new data structure Liam R. Howlett
2020-12-10 17:03 ` [PATCH 06/28] mm: Start tracking VMAs with maple tree Liam R. Howlett
2020-12-11 19:30 ` kernel test robot
2020-12-10 17:03 ` [PATCH 07/28] mm/mmap: Introduce unlock_range() for code cleanup Liam R. Howlett
2020-12-10 17:03 ` [PATCH 08/28] mm/mmap: Change find_vma() to use the maple tree Liam R. Howlett
2020-12-10 17:03 ` [PATCH 09/28] mm/mmap: Change find_vma_prev() to use " Liam R. Howlett
2020-12-10 17:03 ` [PATCH 10/28] mm/mmap: Change unmapped_area and unmapped_area_topdown " Liam R. Howlett
2020-12-10 17:03 ` [PATCH 11/28] kernel/fork: Convert dup_mmap " Liam R. Howlett
2020-12-10 17:03 ` [PATCH 12/28] mm: Remove rb tree Liam R. Howlett
2020-12-10 17:03 ` [PATCH 13/28] mm/gup: Expose mm_populate_vma() for use when the vma is known Liam R. Howlett
2020-12-10 21:03 ` kernel test robot
2020-12-10 17:03 ` [PATCH 14/28] mm/mmap: Change do_brk_flags() to expand existing VMA and add do_brk_munmap() Liam R. Howlett
2020-12-10 17:03 ` [PATCH 15/28] mm/mmap: Change vm_brk_flags() to use mm_populate_vma() Liam R. Howlett
2020-12-10 17:03 ` [PATCH 16/28] mm: Move find_vma_intersection to mmap.c and change implementation to maple tree Liam R. Howlett
2020-12-10 17:03 ` [PATCH 17/28] mm/mmap: Change mmap_region to use maple tree state Liam R. Howlett
2020-12-10 17:03 ` [PATCH 18/28] mm/mmap: Drop munmap_vma_range() Liam R. Howlett
2020-12-10 17:03 ` [PATCH 19/28] mm: Remove vmacache Liam R. Howlett
2020-12-10 17:03 ` [PATCH 20/28] mm/mmap: Change __do_munmap() to avoid unnecessary lookups Liam R. Howlett
2020-12-10 17:03 ` [PATCH 21/28] mm/mmap: Change __do_munmap() to use a ma_state Liam R. Howlett
2020-12-10 17:03 ` [PATCH 22/28] mm/mmap: Move mmap_region() below do_munmap() Liam R. Howlett
2020-12-10 17:03 ` [PATCH 23/28] mm/mmap: Add do_mas_munmap() and wraper for __do_munmap() Liam R. Howlett
2020-12-10 17:03 ` [PATCH 24/28] mmap: Use find_vma_intersection in do_mmap() for overlap Liam R. Howlett
2020-12-10 17:03 ` Liam R. Howlett [this message]
2020-12-10 17:04 ` [PATCH 26/28] mm/mmap: Change do_brk_munmap() to use do_mas_align_munmap() Liam R. Howlett
2020-12-10 17:04 ` [PATCH 27/28] mmap: Update count_vma_pages_range() to only use one ma_state Liam R. Howlett
2020-12-10 17:04 ` [PATCH 28/28] mmap: make remove_vma_list() inline Liam R. Howlett
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