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xen/privcmd: Convert get_user_pages*() to pin_user_pages*() 

In 2019, we introduced pin_user_pages*() and now we are converting
get_user_pages*() to the new API as appropriate. [1] & [2] could
be referred for more information. This is case 5 as per document [1].

[1] Documentation/core-api/pin_user_pages.rst

[2] "Explicit pinning of user-space pages":
        https://lwn.net/Articles/807108/

Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Paul Durrant <xadimgnik@gmail.com>
Link: https://lore.kernel.org/r/1594525195-28345-4-git-send-email-jrdr.linux@gmail.com
Signed-off-by: Juergen Gross <jgross@suse.com>
zero-sugar-mainline-defconfig
Souptick Joarder 2020-07-12 09:09:55 +05:30 committed by Juergen Gross
parent a0c34d2251
commit ff669aa812
1 changed files with 2 additions and 8 deletions
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10
drivers/xen/privcmd.c
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@ -594,7 +594,7 @@ static int lock_pages(
if (requested > nr_pages)
return -ENOSPC;
page_count = get_user_pages_fast(
page_count = pin_user_pages_fast(
(unsigned long) kbufs[i].uptr,
requested, FOLL_WRITE, pages);
if (page_count < 0)
@ -610,13 +610,7 @@ static int lock_pages(
static void unlock_pages(struct page *pages[], unsigned int nr_pages)
{
unsigned int i;
for (i = 0; i < nr_pages; i++) {
if (!PageDirty(pages[i]))
set_page_dirty_lock(pages[i]);
put_page(pages[i]);
}
unpin_user_pages_dirty_lock(pages, nr_pages, true);
}
static long privcmd_ioctl_dm_op(struct file *file, void __user *udata)