The patch titled
Subject: mm/gup: introduce pin_user_pages_fast_only()
has been removed from the -mm tree. Its filename was
mm-gup-introduce-pin_user_pages_fast_only.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: John Hubbard <jhubbard@xxxxxxxxxx>
Subject: mm/gup: introduce pin_user_pages_fast_only()
This is the FOLL_PIN equivalent of __get_user_pages_fast(), except with a
more descriptive name, and gup_flags instead of a boolean "write" in the
argument list.
Link: http://lkml.kernel.org/r/20200519002124.2025955-4-jhubbard@xxxxxxxxxx
Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: "Joonas Lahtinen" <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Matthew Auld <matthew.auld@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Cc: Souptick Joarder <jrdr.linux@xxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 2 ++
mm/gup.c | 36 ++++++++++++++++++++++++++++++++++++
2 files changed, 38 insertions(+)
--- a/include/linux/mm.h~mm-gup-introduce-pin_user_pages_fast_only
+++ a/include/linux/mm.h
@@ -1827,6 +1827,8 @@ extern int mprotect_fixup(struct vm_area
*/
int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
struct page **pages);
+int pin_user_pages_fast_only(unsigned long start, int nr_pages,
+ unsigned int gup_flags, struct page **pages);
/*
* per-process(per-mm_struct) statistics.
*/
--- a/mm/gup.c~mm-gup-introduce-pin_user_pages_fast_only
+++ a/mm/gup.c
@@ -2913,6 +2913,42 @@ int pin_user_pages_fast(unsigned long st
}
EXPORT_SYMBOL_GPL(pin_user_pages_fast);
+/*
+ * This is the FOLL_PIN equivalent of __get_user_pages_fast(). Behavior is the
+ * same, except that this one sets FOLL_PIN instead of FOLL_GET.
+ *
+ * The API rules are the same, too: no negative values may be returned.
+ */
+int pin_user_pages_fast_only(unsigned long start, int nr_pages,
+ unsigned int gup_flags, struct page **pages)
+{
+ int nr_pinned;
+
+ /*
+ * FOLL_GET and FOLL_PIN are mutually exclusive. Note that the API
+ * rules require returning 0, rather than -errno:
+ */
+ if (WARN_ON_ONCE(gup_flags & FOLL_GET))
+ return 0;
+ /*
+ * FOLL_FAST_ONLY is required in order to match the API description of
+ * this routine: no fall back to regular ("slow") GUP.
+ */
+ gup_flags |= (FOLL_PIN | FOLL_FAST_ONLY);
+ nr_pinned = internal_get_user_pages_fast(start, nr_pages, gup_flags,
+ pages);
+ /*
+ * This routine is not allowed to return negative values. However,
+ * internal_get_user_pages_fast() *can* return -errno. Therefore,
+ * correct for that here:
+ */
+ if (nr_pinned < 0)
+ nr_pinned = 0;
+
+ return nr_pinned;
+}
+EXPORT_SYMBOL_GPL(pin_user_pages_fast_only);
+
/**
* pin_user_pages_remote() - pin pages of a remote process (task != current)
*
_
Patches currently in -mm which might be from jhubbard@xxxxxxxxxx are
rapidio-convert-get_user_pages-pin_user_pages.patch
mm-gup-update-pin_user_pagesrst-for-case-3-mmu-notifiers.patch
mm-gup-introduce-pin_user_pages_locked.patch
mm-gup-introduce-pin_user_pages_locked-v2.patch
mm-gup-frame_vector-convert-get_user_pages-pin_user_pages.patch
mm-gup-documentation-fix-for-pin_user_pages-apis.patch
docs-mm-gup-pin_user_pagesrst-add-a-case-5.patch
vhost-convert-get_user_pages-pin_user_pages.patch
