From: Andrew Morton <akpm@linux-foundation.org>
To: Wei Yang <richardw.yang@linux.intel.com>
Cc: aarcange@redhat.com, hughd@google.com, mike.kravetz@oracle.com,
linux-mm@kvack.org
Subject: Re: [PATCH v2 1/3] userfaultfd: use vma_pagesize for all huge page size calculation
Date: Fri, 27 Sep 2019 15:10:33 -0700 [thread overview]
Message-ID: <20190927151033.aad57472652a0b3a6948df6e@linux-foundation.org> (raw)
In-Reply-To: <20190927070032.2129-1-richardw.yang@linux.intel.com>
On Fri, 27 Sep 2019 15:00:30 +0800 Wei Yang <richardw.yang@linux.intel.com> wrote:
> In function __mcopy_atomic_hugetlb, we use two variables to deal with
> huge page size: vma_hpagesize and huge_page_size.
>
> Since they are the same, it is not necessary to use two different
> mechanism. This patch makes it consistent by all using vma_hpagesize.
>
> --- a/mm/userfaultfd.c
> +++ b/mm/userfaultfd.c
> @@ -262,7 +262,7 @@ static __always_inline ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
> pte_t dst_pteval;
>
> BUG_ON(dst_addr >= dst_start + len);
> - VM_BUG_ON(dst_addr & ~huge_page_mask(h));
> + VM_BUG_ON(dst_addr & (vma_hpagesize - 1));
>
> /*
> * Serialize via hugetlb_fault_mutex
> @@ -273,7 +273,7 @@ static __always_inline ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
> mutex_lock(&hugetlb_fault_mutex_table[hash]);
>
> err = -ENOMEM;
> - dst_pte = huge_pte_alloc(dst_mm, dst_addr, huge_page_size(h));
> + dst_pte = huge_pte_alloc(dst_mm, dst_addr, vma_hpagesize);
> if (!dst_pte) {
> mutex_unlock(&hugetlb_fault_mutex_table[hash]);
> goto out_unlock;
> @@ -300,7 +300,8 @@ static __always_inline ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
>
> err = copy_huge_page_from_user(page,
> (const void __user *)src_addr,
> - pages_per_huge_page(h), true);
> + vma_hpagesize / PAGE_SIZE,
> + true);
> if (unlikely(err)) {
> err = -EFAULT;
> goto out;
Looks right.
We could go ahead and remove local variable `h', given that
hugetlb_fault_mutex_hash() doesn't actually use its first arg..
next prev parent reply other threads:[~2019-09-27 22:10 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-27 7:00 [PATCH v2 1/3] userfaultfd: use vma_pagesize for all huge page size calculation Wei Yang
2019-09-27 7:00 ` [PATCH v2 2/3] userfaultfd: remove unnecessary warn_on in __mcopy_atomic_hugetlb Wei Yang
2019-09-27 7:00 ` [PATCH v2 3/3] userfaultfd: wrap the common dst_vma check into an inlined function Wei Yang
2019-09-27 22:10 ` Andrew Morton [this message]
2019-09-27 22:21 ` [PATCH v2 1/3] userfaultfd: use vma_pagesize for all huge page size calculation Mike Kravetz
2019-10-05 0:34 ` Wei Yang
2019-09-29 0:45 ` Wei Yang
2019-10-07 22:55 ` Mike Kravetz
2019-10-08 0:57 ` Wei Yang
2019-10-05 0:33 ` [PATCH] hugetlb: remove unused hstate in hugetlb_fault_mutex_hash() Wei Yang
2019-10-05 5:42 ` kbuild test robot
2019-10-05 5:43 ` kbuild test robot
2019-10-06 2:25 ` kbuild test robot
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190927151033.aad57472652a0b3a6948df6e@linux-foundation.org \
--to=akpm@linux-foundation.org \
--cc=aarcange@redhat.com \
--cc=hughd@google.com \
--cc=linux-mm@kvack.org \
--cc=mike.kravetz@oracle.com \
--cc=richardw.yang@linux.intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).