From: Nadav Amit <nadav.amit@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Peter Xu <peterx@redhat.com>, Nadav Amit <namit@vmware.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Minchan Kim <minchan@kernel.org>, Colin Cross <ccross@google.com>,
Suren Baghdasarya <surenb@google.com>,
Mike Rapoport <rppt@linux.vnet.ibm.com>
Subject: [RFC PATCH 3/8] mm/madvise: remove unnecessary checks on madvise_free_single_vma()
Date: Sun, 26 Sep 2021 09:12:54 -0700 [thread overview]
Message-ID: <20210926161259.238054-4-namit@vmware.com> (raw)
In-Reply-To: <20210926161259.238054-1-namit@vmware.com>
From: Nadav Amit <namit@vmware.com>
madvise_free_single_vma() currently rechecks that the range fits within
the VMA, adapts it accordingly, and returns -EINVAL if the range is
entirely outside of the VMA.
The error-code of -EINVAL is incorrect according to the man pages (as it
should have been -ENOMEM), but anyhow the range that is provided to
madvise_free_single_vma() should always be valid. It is set correctly in
do_madvise() and then rechecked in madvise_dontneed_free() is the
mmap-lock is dropped.
Remove this check.
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Colin Cross <ccross@google.com>
Cc: Suren Baghdasarya <surenb@google.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Nadav Amit <namit@vmware.com>
---
mm/madvise.c | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)
diff --git a/mm/madvise.c b/mm/madvise.c
index fe843513a4e8..17e39c70704b 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -716,14 +716,8 @@ static int madvise_free_single_vma(struct vm_area_struct *vma,
if (!vma_is_anonymous(vma))
return -EINVAL;
- range.start = max(vma->vm_start, start_addr);
- if (range.start >= vma->vm_end)
- return -EINVAL;
- range.end = min(vma->vm_end, end_addr);
- if (range.end <= vma->vm_start)
- return -EINVAL;
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm,
- range.start, range.end);
+ start_addr, end_addr);
lru_add_drain();
tlb_gather_mmu(&tlb, mm);
--
2.25.1
next prev parent reply other threads:[~2021-09-26 23:44 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-26 16:12 [RFC PATCH 0/8] mm/madvise: support process_madvise(MADV_DONTNEED) Nadav Amit
2021-09-26 16:12 ` [RFC PATCH 1/8] mm/madvise: propagate vma->vm_end changes Nadav Amit
2021-09-27 9:08 ` Kirill A. Shutemov
2021-09-27 10:11 ` Nadav Amit
2021-09-27 11:55 ` Kirill A. Shutemov
2021-09-27 12:33 ` Nadav Amit
2021-09-27 12:45 ` Kirill A. Shutemov
2021-09-27 12:59 ` Nadav Amit
2021-09-26 16:12 ` [RFC PATCH 2/8] mm/madvise: remove unnecessary check on madvise_dontneed_free() Nadav Amit
2021-09-27 9:11 ` Kirill A. Shutemov
2021-09-27 11:05 ` Nadav Amit
2021-09-27 12:19 ` Kirill A. Shutemov
2021-09-27 12:52 ` Nadav Amit
2021-09-26 16:12 ` Nadav Amit [this message]
2021-09-27 9:17 ` [RFC PATCH 3/8] mm/madvise: remove unnecessary checks on madvise_free_single_vma() Kirill A. Shutemov
2021-09-27 9:24 ` Kirill A. Shutemov
2021-09-26 16:12 ` [RFC PATCH 4/8] mm/madvise: define madvise behavior in a struct Nadav Amit
2021-09-27 9:31 ` Kirill A. Shutemov
2021-09-27 10:31 ` Nadav Amit
2021-09-27 12:14 ` Kirill A. Shutemov
2021-09-27 20:36 ` Nadav Amit
2021-09-26 16:12 ` [RFC PATCH 5/8] mm/madvise: perform certain operations once on process_madvise() Nadav Amit
2021-09-26 16:12 ` [RFC PATCH 6/8] mm/madvise: more aggressive TLB batching Nadav Amit
2021-09-26 16:12 ` [RFC PATCH 7/8] mm/madvise: deduplicate code in madvise_dontneed_free() Nadav Amit
2021-09-26 16:12 ` [RFC PATCH 8/8] mm/madvise: process_madvise(MADV_DONTNEED) Nadav Amit
2021-09-27 9:24 ` [RFC PATCH 0/8] mm/madvise: support process_madvise(MADV_DONTNEED) David Hildenbrand
2021-09-27 10:41 ` Nadav Amit
2021-09-27 10:58 ` David Hildenbrand
2021-09-27 12:00 ` Nadav Amit
2021-09-27 12:16 ` Michal Hocko
2021-09-27 19:12 ` Nadav Amit
2021-09-29 7:52 ` Michal Hocko
2021-09-29 18:31 ` Nadav Amit
2021-10-12 23:14 ` Peter Xu
2021-10-13 15:47 ` Nadav Amit
2021-10-13 23:09 ` Peter Xu
2021-09-27 17:05 ` David Hildenbrand
2021-09-27 19:59 ` Nadav Amit
2021-09-28 8:53 ` David Hildenbrand
2021-09-28 22:56 ` Nadav Amit
2021-10-04 17:58 ` David Hildenbrand
2021-10-07 16:19 ` Nadav Amit
2021-10-07 16:46 ` David Hildenbrand
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