+ mm-gup-dont-call-__gup_longterm_locked-if-foll_longterm-cannot-be-set.patch added to mm-unstable branch

+ mm-gup-dont-call-__gup_longterm_locked-if-foll_longterm-cannot-be-set.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/gup: don't call __gup_longterm_locked() if FOLL_LONGTERM cannot be set
has been added to the -mm mm-unstable branch.  Its filename is
     mm-gup-dont-call-__gup_longterm_locked-if-foll_longterm-cannot-be-set.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-gup-dont-call-__gup_longterm_locked-if-foll_longterm-cannot-be-set.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Jason Gunthorpe <jgg@nvidia.com>
Subject: mm/gup: don't call __gup_longterm_locked() if FOLL_LONGTERM cannot be set
Date: Tue, 24 Jan 2023 16:34:24 -0400

get_user_pages_remote(), get_user_pages_unlocked() and get_user_pages()
are never called with FOLL_LONGTERM, so directly call
__get_user_pages_locked()

The next patch will add an assertion for this.

Link: https://lkml.kernel.org/r/3-v2-987e91b59705+36b-gup_tidy_jgg@nvidia.com
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Suggested-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


--- a/mm/gup.c~mm-gup-dont-call-__gup_longterm_locked-if-foll_longterm-cannot-be-set
+++ a/mm/gup.c
@@ -2200,8 +2200,8 @@ long get_user_pages_remote(struct mm_str
 	if (!is_valid_gup_flags(gup_flags))
 		return -EINVAL;
 
-	return __gup_longterm_locked(mm, start, nr_pages, pages, vmas, locked,
-				     gup_flags | FOLL_TOUCH | FOLL_REMOTE);
+	return __get_user_pages_locked(mm, start, nr_pages, pages, vmas, locked,
+				       gup_flags | FOLL_TOUCH | FOLL_REMOTE);
 }
 EXPORT_SYMBOL(get_user_pages_remote);
 
@@ -2238,8 +2238,8 @@ long get_user_pages(unsigned long start,
 	if (!is_valid_gup_flags(gup_flags))
 		return -EINVAL;
 
-	return __gup_longterm_locked(current->mm, start, nr_pages,
-				     pages, vmas, NULL, gup_flags | FOLL_TOUCH);
+	return __get_user_pages_locked(current->mm, start, nr_pages, pages,
+				       vmas, NULL, gup_flags | FOLL_TOUCH);
 }
 EXPORT_SYMBOL(get_user_pages);
 
@@ -2263,8 +2263,8 @@ long get_user_pages_unlocked(unsigned lo
 {
 	int locked = 0;
 
-	return __gup_longterm_locked(current->mm, start, nr_pages, pages, NULL,
-				     &locked, gup_flags | FOLL_TOUCH);
+	return __get_user_pages_locked(current->mm, start, nr_pages, pages,
+				       NULL, &locked, gup_flags | FOLL_TOUCH);
 }
 EXPORT_SYMBOL(get_user_pages_unlocked);
 
_

Patches currently in -mm which might be from jgg@nvidia.com are

mm-gup-have-internal-functions-get-the-mmap_read_lock.patch
mm-gup-remove-obsolete-foll_longterm-comment.patch
mm-gup-dont-call-__gup_longterm_locked-if-foll_longterm-cannot-be-set.patch
mm-gup-move-try_grab_page-to-mm-internalh.patch
mm-gup-simplify-the-external-interface-functions-and-consolidate-invariants.patch
mm-gup-add-an-assertion-that-the-mmap-lock-is-locked.patch
mm-gup-remove-locked-being-null-from-faultin_vma_page_range.patch
mm-gup-add-foll_unlockable.patch
mm-gup-make-locked-never-null-in-the-internal-gup-functions.patch
mm-gup-remove-pin_user_pages_fast_only.patch
mm-gup-make-get_user_pages_fast_only-return-the-common-return-value.patch
mm-gup-move-gup_must_unshare-to-mm-internalh.patch
mm-gup-move-private-gup-foll_-flags-to-internalh.patch