+ mm-gup-dont-permit-users-to-call-get_user_pages-with-foll_longterm-fix.patch added to -mm tree

+ mm-gup-dont-permit-users-to-call-get_user_pages-with-foll_longterm-fix.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm-gup-dont-permit-users-to-call-get_user_pages-with-foll_longterm-fix
has been added to the -mm tree.  Its filename is
     mm-gup-dont-permit-users-to-call-get_user_pages-with-foll_longterm-fix.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-gup-dont-permit-users-to-call-get_user_pages-with-foll_longterm-fix.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-gup-dont-permit-users-to-call-get_user_pages-with-foll_longterm-fix.patch

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------------------------------------------------------
From: Andrew Morton <akpm@linux-foundation.org>
Subject: mm-gup-dont-permit-users-to-call-get_user_pages-with-foll_longterm-fix

fix CONFIG_MMU=n build

Link: https://lkml.kernel.org/r/CA+G9fYuNS3k0DVT62twfV746pfNhCSrk5sVMcOcQ1PGGnEseyw@mail.gmail.com
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Cc: Barry Song <song.bao.hua@hisilicon.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/gup.c |   38 +++++++++++++++++++-------------------
 1 file changed, 19 insertions(+), 19 deletions(-)

--- a/mm/gup.c~mm-gup-dont-permit-users-to-call-get_user_pages-with-foll_longterm-fix
+++ a/mm/gup.c
@@ -1759,6 +1759,25 @@ static __always_inline long __gup_longte
 }
 #endif /* CONFIG_FS_DAX || CONFIG_CMA */
 
+static bool is_valid_gup_flags(unsigned int gup_flags)
+{
+	/*
+	 * FOLL_PIN must only be set internally by the pin_user_pages*() APIs,
+	 * never directly by the caller, so enforce that with an assertion:
+	 */
+	if (WARN_ON_ONCE(gup_flags & FOLL_PIN))
+		return false;
+	/*
+	 * FOLL_PIN is a prerequisite to FOLL_LONGTERM. Another way of saying
+	 * that is, FOLL_LONGTERM is a specific case, more restrictive case of
+	 * FOLL_PIN.
+	 */
+	if (WARN_ON_ONCE(gup_flags & FOLL_LONGTERM))
+		return false;
+
+	return true;
+}
+
 #ifdef CONFIG_MMU
 static long __get_user_pages_remote(struct mm_struct *mm,
 				    unsigned long start, unsigned long nr_pages,
@@ -1789,25 +1808,6 @@ static long __get_user_pages_remote(stru
 				       gup_flags | FOLL_TOUCH | FOLL_REMOTE);
 }
 
-static bool is_valid_gup_flags(unsigned int gup_flags)
-{
-	/*
-	 * FOLL_PIN must only be set internally by the pin_user_pages*() APIs,
-	 * never directly by the caller, so enforce that with an assertion:
-	 */
-	if (WARN_ON_ONCE(gup_flags & FOLL_PIN))
-		return false;
-	/*
-	 * FOLL_PIN is a prerequisite to FOLL_LONGTERM. Another way of saying
-	 * that is, FOLL_LONGTERM is a specific case, more restrictive case of
-	 * FOLL_PIN.
-	 */
-	if (WARN_ON_ONCE(gup_flags & FOLL_LONGTERM))
-		return false;
-
-	return true;
-}
-
 /**
  * get_user_pages_remote() - pin user pages in memory
  * @mm:		mm_struct of target mm
_

Patches currently in -mm which might be from akpm@linux-foundation.org are

mm-slub-re-initialize-randomized-freelist-sequence-in-calculate_sizes-fix.patch
mm.patch
mm-gup-dont-permit-users-to-call-get_user_pages-with-foll_longterm-fix.patch
memblock-make-memblock_debug-and-related-functionality-private-fix.patch
mm-vmstat-fix-proc-sys-vm-stat_refresh-generating-false-warnings-fix-2.patch
kernel-forkc-export-kernel_thread-to-modules.patch