From: Jason Gunthorpe <jgg@ziepe.ca>
To: Jerome Glisse <jglisse@redhat.com>,
Ralph Campbell <rcampbell@nvidia.com>,
Felix.Kuehling@amd.com
Cc: Philip Yang <Philip.Yang@amd.com>,
John Hubbard <jhubbard@nvidia.com>,
amd-gfx@lists.freedesktop.org,
Steven Price <steven.price@arm.com>,
linux-mm@kvack.org, Jason Gunthorpe <jgg@mellanox.com>,
dri-devel@lists.freedesktop.org, Christoph Hellwig <hch@lst.de>
Subject: [PATCH hmm 3/8] mm/hmm: do not call hmm_vma_walk_hole() while holding a spinlock
Date: Wed, 11 Mar 2020 15:35:01 -0300 [thread overview]
Message-ID: <20200311183506.3997-4-jgg@ziepe.ca> (raw)
In-Reply-To: <20200311183506.3997-1-jgg@ziepe.ca>
From: Jason Gunthorpe <jgg@mellanox.com>
This eventually calls into handle_mm_fault() which is a sleeping function.
Release the lock first.
hmm_vma_walk_hole() does not touch the contents of the PUD, so it does not
need the lock.
Fixes: 3afc423632a1 ("mm: pagewalk: add p4d_entry() and pgd_entry()")
Cc: Steven Price <steven.price@arm.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
---
mm/hmm.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/mm/hmm.c b/mm/hmm.c
index 9e8f68eb83287a..32dcbfd3908315 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -473,8 +473,8 @@ static int hmm_vma_walk_pud(pud_t *pudp, unsigned long start, unsigned long end,
pud = READ_ONCE(*pudp);
if (pud_none(pud)) {
- ret = hmm_vma_walk_hole(start, end, -1, walk);
- goto out_unlock;
+ spin_unlock(ptl);
+ return hmm_vma_walk_hole(start, end, -1, walk);
}
if (pud_huge(pud) && pud_devmap(pud)) {
@@ -483,8 +483,8 @@ static int hmm_vma_walk_pud(pud_t *pudp, unsigned long start, unsigned long end,
bool fault, write_fault;
if (!pud_present(pud)) {
- ret = hmm_vma_walk_hole(start, end, -1, walk);
- goto out_unlock;
+ spin_unlock(ptl);
+ return hmm_vma_walk_hole(start, end, -1, walk);
}
i = (addr - range->start) >> PAGE_SHIFT;
@@ -495,9 +495,9 @@ static int hmm_vma_walk_pud(pud_t *pudp, unsigned long start, unsigned long end,
hmm_range_need_fault(hmm_vma_walk, pfns, npages,
cpu_flags, &fault, &write_fault);
if (fault || write_fault) {
- ret = hmm_vma_walk_hole_(addr, end, fault,
- write_fault, walk);
- goto out_unlock;
+ spin_unlock(ptl);
+ return hmm_vma_walk_hole_(addr, end, fault, write_fault,
+ walk);
}
pfn = pud_pfn(pud) + ((addr & ~PUD_MASK) >> PAGE_SHIFT);
--
2.25.1
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next prev parent reply other threads:[~2020-03-12 8:09 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-11 18:34 [PATCH hmm 0/8] Various error case bug fixes for hmm_range_fault() Jason Gunthorpe
2020-03-11 18:34 ` [PATCH hmm 1/8] mm/hmm: add missing unmaps of the ptep during hmm_vma_handle_pte() Jason Gunthorpe
2020-03-12 1:28 ` Ralph Campbell
2020-03-12 14:24 ` Jason Gunthorpe
2020-03-11 18:35 ` [PATCH hmm 2/8] mm/hmm: don't free the cached pgmap while scanning Jason Gunthorpe
2020-03-12 1:29 ` Ralph Campbell
[not found] ` <20200316090250.GB12439@lst.de>
2020-03-16 18:07 ` Jason Gunthorpe
[not found] ` <20200316181324.GA24533@lst.de>
2020-03-16 19:23 ` Jason Gunthorpe
2020-03-11 18:35 ` Jason Gunthorpe [this message]
2020-03-12 1:31 ` [PATCH hmm 3/8] mm/hmm: do not call hmm_vma_walk_hole() while holding a spinlock Ralph Campbell
2020-03-12 8:54 ` Steven Price
2020-03-12 10:28 ` [PATCH] mm/hmm: Simplify hmm_vma_walk_pud slightly Steven Price
2020-03-12 14:27 ` Jason Gunthorpe
2020-03-12 14:40 ` Steven Price
2020-03-12 15:11 ` Jason Gunthorpe
2020-03-12 16:16 ` Steven Price
2020-03-12 16:37 ` Jason Gunthorpe
2020-03-12 17:02 ` Steven Price
2020-03-12 17:17 ` Jason Gunthorpe
2020-03-13 19:55 ` Jason Gunthorpe
2020-03-13 21:04 ` Matthew Wilcox
2020-03-13 22:51 ` Jason Gunthorpe
[not found] ` <20200316090503.GC12439@lst.de>
2020-03-16 12:56 ` [PATCH hmm 3/8] mm/hmm: do not call hmm_vma_walk_hole() while holding a spinlock Jason Gunthorpe
2020-03-11 18:35 ` [PATCH hmm 4/8] mm/hmm: add missing pfns set to hmm_vma_walk_pmd() Jason Gunthorpe
2020-03-12 1:33 ` Ralph Campbell
2020-03-11 18:35 ` [PATCH hmm 5/8] mm/hmm: add missing call to hmm_range_need_fault() before returning EFAULT Jason Gunthorpe
2020-03-12 1:34 ` Ralph Campbell
2020-03-11 18:35 ` [PATCH hmm 6/8] mm/hmm: reorganize how !pte_present is handled in hmm_vma_handle_pte() Jason Gunthorpe
2020-03-12 1:36 ` Ralph Campbell
2020-03-11 18:35 ` [PATCH hmm 7/8] mm/hmm: return -EFAULT when setting HMM_PFN_ERROR on requested valid pages Jason Gunthorpe
2020-03-12 1:36 ` Ralph Campbell
2020-03-12 14:35 ` Jason Gunthorpe
2020-03-11 18:35 ` [PATCH hmm 8/8] mm/hmm: add missing call to hmm_pte_need_fault in HMM_PFN_SPECIAL handling Jason Gunthorpe
2020-03-12 1:38 ` Ralph Campbell
[not found] ` <20200316091347.GH12439@lst.de>
2020-03-16 12:10 ` Jason Gunthorpe
[not found] ` <20200316124953.GC17386@lst.de>
2020-03-16 13:04 ` Jason Gunthorpe
[not found] ` <20200316131201.GA17955@lst.de>
[not found] ` <20200317123210.GA12058@lst.de>
2020-03-17 12:53 ` Jason Gunthorpe
[not found] ` <20200317130608.GA13030@lst.de>
2020-03-17 13:25 ` Jason Gunthorpe
2020-03-12 19:33 ` [PATCH hmm 9/8] mm/hmm: do not check pmd_protnone twice in hmm_vma_handle_pmd() Jason Gunthorpe
2020-03-12 23:50 ` Ralph Campbell
2020-03-16 18:25 ` [PATCH hmm 0/8] Various error case bug fixes for hmm_range_fault() Jason Gunthorpe
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