diff --git a/debian/changelog b/debian/changelog
index 9c511e5fd..e575026aa 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+linux (4.9.2-2) UNRELEASED; urgency=medium
+
+  * [sparc64] Export memcpy and memset to modules again (fixes FTBFS)
+
+ -- Ben Hutchings <ben@decadent.org.uk>  Thu, 12 Jan 2017 00:14:36 +0000
+
 linux (4.9.2-1) unstable; urgency=medium
 
   * New upstream stable update:
diff --git a/debian/patches/bugfix/sparc/revert-sparc-move-exports-to-definitions.patch b/debian/patches/bugfix/sparc/revert-sparc-move-exports-to-definitions.patch
index 355582c77..59f634c8d 100644
--- a/debian/patches/bugfix/sparc/revert-sparc-move-exports-to-definitions.patch
+++ b/debian/patches/bugfix/sparc/revert-sparc-move-exports-to-definitions.patch
@@ -1,5 +1,5 @@
 From: Ben Hutchings <ben@decadent.org.uk>
-Date: Thu, 1 Dec 2016 23:10:49 +0000
+Date: Thu, 12 Jan 2017 00:08:36 +0000
 Subject: Revert "sparc: move exports to definitions"
 Forwarded: not-needed
 
@@ -8,8 +8,11 @@ symbols exported from assembly don't automatically get modversions (ABI
 hashes).
 
 Commit 70a6fcf3283a "[sparc] unify 32bit and 64bit string.h" removed
-the exports of __memmove, memcpy, memset, and memscan; don't try to
-export them again.
+the export of __memmove; don't try to export it again.  It also
+completely disabled declaration of prototypes of memscan, memcpy and
+memset, which are defined as macros.  gcc will still generate implicit
+calls to memcpy and memset, so restore both exports and prototypes for
+them.  Don't restore the export of memscan.
 
 Commit aa95ce361ed9 "sparc64: Delete __ret_efault." did what it says;
 don't try to export that symbol.
@@ -793,7 +796,7 @@ don't try to export that symbol.
 -EXPORT_SYMBOL(ip_fast_csum)
 --- /dev/null
 +++ b/arch/sparc/lib/ksyms.c
-@@ -0,0 +1,167 @@
+@@ -0,0 +1,173 @@
 +/*
 + * Export of symbols defined in assembler
 + */
@@ -813,11 +816,17 @@ don't try to export that symbol.
 +/* mem* functions */
 +extern void *__memscan_zero(void *, size_t);
 +extern void *__memscan_generic(void *, int, size_t);
++#undef memcpy
++extern void *memcpy(void *, const void *, size_t);
++#undef memset
++extern void *memset(void *, int, size_t);
 +extern void *__bzero(void *, size_t);
 +
 +EXPORT_SYMBOL(__memscan_zero);
 +EXPORT_SYMBOL(__memscan_generic);
 +EXPORT_SYMBOL(memcmp);
++EXPORT_SYMBOL(memcpy);
++EXPORT_SYMBOL(memset);
 +EXPORT_SYMBOL(memmove);
 +EXPORT_SYMBOL(__bzero);
 +