From: David Hildenbrand <david@redhat.com>
To: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Janosch Frank <frankja@linux.ibm.com>,
Claudio Imbrenda <imbrenda@linux.ibm.com>,
Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Peter Xu <peterx@redhat.com>, Sven Schnelle <svens@linux.ibm.com>,
Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
Andrea Arcangeli <aarcange@redhat.com>,
kvm@vger.kernel.org, linux-s390@vger.kernel.org
Subject: Re: [PATCH v2 1/2] mm/userfaultfd: don't place zeropages when zeropages are disallowed
Date: Thu, 11 Apr 2024 14:55:12 +0200 [thread overview]
Message-ID: <15bb1139-97aa-484c-9087-dccf6612ed39@redhat.com> (raw)
In-Reply-To: <b9d9af94-5935-4034-bf3f-9ba283df3ede@redhat.com>
On 11.04.24 14:30, David Hildenbrand wrote:
> On 11.04.24 14:26, Alexander Gordeev wrote:
>> On Wed, Mar 27, 2024 at 06:17:36PM +0100, David Hildenbrand wrote:
>>
>> Hi David,
>> ...
>>> static int mfill_atomic_pte_zeropage(pmd_t *dst_pmd,
>>> struct vm_area_struct *dst_vma,
>>> unsigned long dst_addr)
>>> @@ -324,6 +355,9 @@ static int mfill_atomic_pte_zeropage(pmd_t *dst_pmd,
>>> spinlock_t *ptl;
>>> int ret;
>>>
>>> + if (mm_forbids_zeropage(dst_vma->mm))
>>
>> I assume, you were going to pass dst_vma->vm_mm here?
>> This patch does not compile otherwise.
>
> Ah, I compiled it only on x86, where the parameter is ignored ... and
> for testing the code path I forced mm_forbids_zeropage to be 1 on x86.
Now I get it, I compiled it all on s390x, but not the individual
patches, so patch #2 hid the issue in patch #1. Sneaky. :)
--
Cheers,
David / dhildenb
next prev parent reply other threads:[~2024-04-11 12:55 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-27 17:17 [PATCH v2 0/2] s390/mm: shared zeropage + KVM fixes David Hildenbrand
2024-03-27 17:17 ` [PATCH v2 1/2] mm/userfaultfd: don't place zeropages when zeropages are disallowed David Hildenbrand
2024-04-11 12:26 ` Alexander Gordeev
2024-04-11 12:30 ` David Hildenbrand
2024-04-11 12:55 ` David Hildenbrand [this message]
2024-03-27 17:17 ` [PATCH v2 2/2] s390/mm: re-enable the shared zeropage for !PV and !skeys KVM guests David Hildenbrand
2024-04-11 12:33 ` Alexander Gordeev
2024-04-11 12:48 ` David Hildenbrand
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