Revert "objtool: Fix CONFIG_STACK_VALIDATION=y warning for out-of-tree modules"

This removes the bogus check for libelf-dev.

debian/changelog

@@ -53,6 +53,8 @@ linux (4.14.13-1) UNRELEASED; urgency=medium
   * abiupdate.py: Add support for security mirrors
   * Fix dependencies related to objtool (Closes: #886474):
     - linux-headers: Add versioned dependency on linux-kbuild
+    - Revert "objtool: Fix CONFIG_STACK_VALIDATION=y warning for out-of-tree
+      modules"
 
  -- Salvatore Bonaccorso <carnil@debian.org>  Wed, 10 Jan 2018 09:58:46 +0100
 

debian/patches/debian/revert-objtool-fix-config_stack_validation-y-warning.patch

@@ -0,0 +1,60 @@
+From: Ben Hutchings <ben@decadent.org.uk>
+Date: Sun, 14 Jan 2018 19:27:18 +0000
+Subject: Revert "objtool: Fix CONFIG_STACK_VALIDATION=y warning for
+ out-of-tree modules"
+
+This reverts commit 9f0c18aec620bc9d82268b3cb937568dd07b43ff.  This
+check doesn't make sense for OOT modules as they should always use
+a pre-built objtool.
+---
+ Makefile | 33 ++++++++++++++++-----------------
+ 1 file changed, 16 insertions(+), 17 deletions(-)
+
+--- a/Makefile
++++ b/Makefile
+@@ -937,22 +937,6 @@ mod_sign_cmd = true
+ endif
+ export mod_sign_cmd
+ 
+-ifdef CONFIG_STACK_VALIDATION
+-  has_libelf := $(call try-run,\
+-		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
+-  ifeq ($(has_libelf),1)
+-    objtool_target := tools/objtool FORCE
+-  else
+-    ifdef CONFIG_UNWINDER_ORC
+-      $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
+-    else
+-      $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
+-    endif
+-    SKIP_STACK_VALIDATION := 1
+-    export SKIP_STACK_VALIDATION
+-  endif
+-endif
+-
+ 
+ ifeq ($(KBUILD_EXTMOD),)
+ core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
+@@ -1080,6 +1064,22 @@ prepare0: archprepare gcc-plugins
+ # All the preparing..
+ prepare: prepare0 prepare-objtool
+ 
++ifdef CONFIG_STACK_VALIDATION
++  has_libelf := $(call try-run,\
++		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
++  ifeq ($(has_libelf),1)
++    objtool_target := tools/objtool FORCE
++  else
++    ifdef CONFIG_UNWINDER_ORC
++      $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
++    else
++      $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
++    endif
++    SKIP_STACK_VALIDATION := 1
++    export SKIP_STACK_VALIDATION
++  endif
++endif
++
+ PHONY += prepare-objtool
+ prepare-objtool: $(objtool_target)
+ 

debian/patches/series

@@ -84,6 +84,7 @@ bugfix/all/xen-time-do-not-decrease-steal-time-after-live-migra.patch
 bugfix/all/e1000e-fix-e1000_check_for_copper_link_ich8lan-return-value.patch
 bugfix/all/libsas-Disable-asynchronous-aborts-for-SATA-devices.patch
 bugfix/all/drm-nouveau-disp-gf119-add-missing-drive-vfunc-ptr.patch
+debian/revert-objtool-fix-config_stack_validation-y-warning.patch
 
 # Miscellaneous features