From: Andrew Morton <akpm@linux-foundation.org>
To: Dmitry Osipenko <digetx@gmail.com>
Cc: Wei Yang <richardw.yang@linux.intel.com>,
dan.j.williams@intel.com, aneesh.kumar@linux.ibm.com,
kirill@shutemov.name, yang.shi@linux.alibaba.com,
thellstrom@vmware.com, Thierry Reding <thierry.reding@gmail.com>,
Jon Hunter <jonathanh@nvidia.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Russell King - ARM Linux <linux@armlinux.org.uk>
Subject: Re: [PATCH 3/5] mm/mremap: use pmd_addr_end to calculate next in move_page_tables()
Date: Sun, 26 Jan 2020 18:59:51 -0800 [thread overview]
Message-ID: <20200126185951.c9246349befcccce210a4ab8@linux-foundation.org> (raw)
In-Reply-To: <7147774a-14e9-4ff3-1548-4565f0d214d5@gmail.com>
On Sun, 26 Jan 2020 17:47:57 +0300 Dmitry Osipenko <digetx@gmail.com> wrote:
> 18.01.2020 02:22, Wei Yang пишет:
> > Use the general helper instead of do it by hand.
> >
> > Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
> > ---
> > mm/mremap.c | 7 ++-----
> > 1 file changed, 2 insertions(+), 5 deletions(-)
> >
> > diff --git a/mm/mremap.c b/mm/mremap.c
> > index c2af8ba4ba43..a258914f3ee1 100644
> > --- a/mm/mremap.c
> > +++ b/mm/mremap.c
> > @@ -253,11 +253,8 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
> >
> > for (; old_addr < old_end; old_addr += extent, new_addr += extent) {
> > cond_resched();
> > - next = (old_addr + PMD_SIZE) & PMD_MASK;
> > - /* even if next overflowed, extent below will be ok */
> > + next = pmd_addr_end(old_addr, old_end);
> > extent = next - old_addr;
> > - if (extent > old_end - old_addr)
> > - extent = old_end - old_addr;
> > old_pmd = get_old_pmd(vma->vm_mm, old_addr);
> > if (!old_pmd)
> > continue;
> > @@ -301,7 +298,7 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
> >
> > if (pte_alloc(new_vma->vm_mm, new_pmd))
> > break;
> > - next = (new_addr + PMD_SIZE) & PMD_MASK;
> > + next = pmd_addr_end(new_addr, new_addr + len);
> > if (extent > next - new_addr)
> > extent = next - new_addr;
> > move_ptes(vma, old_pmd, old_addr, old_addr + extent, new_vma,
> >
>
> Hello Wei,
>
> Starting with next-20200122, I'm seeing the following in KMSG on NVIDIA
> Tegra (ARM32):
>
> BUG: Bad rss-counter state mm:(ptrval) type:MM_ANONPAGES val:190
>
> and eventually kernel hangs.
>
> Git's bisection points to this patch and reverting it helps. Please fix,
> thanks in advance.
Thanks. I had these tagged for 5.7-rc1 anyway, so I'll drop all five
patches.
next prev parent reply other threads:[~2020-01-27 2:59 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-17 23:22 [PATCH 0/5] mm/mremap.c: cleanup move_page_tables() a little Wei Yang
2020-01-17 23:22 ` [PATCH 1/5] mm/mremap: format the check in move_normal_pmd() same as move_huge_pmd() Wei Yang
2020-01-17 23:22 ` [PATCH 2/5] mm/mremap: it is sure to have enough space when extent meets requirement Wei Yang
2020-01-17 23:22 ` [PATCH 3/5] mm/mremap: use pmd_addr_end to calculate next in move_page_tables() Wei Yang
2020-01-26 14:47 ` Dmitry Osipenko
2020-01-27 2:59 ` Andrew Morton [this message]
2020-01-29 17:18 ` Dmitry Osipenko
2020-01-29 23:59 ` Andrew Morton
2020-01-30 0:28 ` Stephen Rothwell
2020-01-28 0:43 ` Wei Yang
2020-01-28 15:59 ` Dmitry Osipenko
2020-01-28 23:29 ` Wei Yang
2020-01-28 23:35 ` Dmitry Osipenko
2020-01-29 0:28 ` Wei Yang
2020-01-29 18:56 ` Dmitry Osipenko
2020-01-29 9:47 ` Russell King - ARM Linux admin
2020-01-29 14:21 ` Dmitry Osipenko
2020-01-29 21:57 ` Wei Yang
2020-01-29 23:24 ` Russell King - ARM Linux admin
2020-01-30 1:30 ` Wei Yang
2020-01-30 14:15 ` Russell King - ARM Linux admin
2020-01-30 21:57 ` Wei Yang
2020-01-17 23:22 ` [PATCH 4/5] mm/mremap: calculate extent in one place Wei Yang
2020-01-17 23:22 ` [PATCH 5/5] mm/mremap: start addresses are properly aligned Wei Yang
2020-01-19 0:07 ` [PATCH 0/5] mm/mremap.c: cleanup move_page_tables() a little Andrew Morton
2020-01-19 2:11 ` Wei Yang
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