[4.2.y-ckt stable] Patch "kbuild: Demote 'sign-compare' warning to W=2" has been added to the 4.2.y-ckt tree

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    kbuild: Demote 'sign-compare' warning to W=2

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt3.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

>From f55875787d6ce4ff9a5e7a9283b81f393860a73e Mon Sep 17 00:00:00 2001
From: Lee Jones <lee.jones at linaro.org>
Date: Tue, 12 Jan 2016 14:24:18 +0000
Subject: kbuild: Demote 'sign-compare' warning to W=2

commit 7599ea8b4e25fd8dea26cb64f100cf265d1e6bf3 upstream.

Ideally, a kernel compile with W=1 enabled should complete cleanly;
however, when we run one currently we are presented with ~25k warnings.
'sign-compare' accounts for ~22k of those ~25k.

In this patch we're demoting 'sign-compare' warnings to W=2, with a view
to fixing the remaining 3k W=1 warnings required for a clean build.

Arnd adds:
  "As per our discussion, I'd add that this was inadvertedly introduced
   by Behan when he moved the clang specific warnings into an ifdef block
   and did not notice that -Wsign-compare was interpreted by both gcc
   and clang.

   Earlier, it was introduced in just the same way by Jan-Simon as part
   of 3d3d6b847420 ("kbuild: LLVMLinux: Adapt warnings for compilation
   with clang")."

Acked-by: Arnd Bergmann <arnd at arndb.de>
Fixes: 26ea6bb1fef0 ("kbuild, LLVMLinux: Supress warnings unless W=1-3")
Signed-off-by: Lee Jones <lee.jones at linaro.org>
Signed-off-by: Michal Marek <mmarek at suse.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 scripts/Makefile.extrawarn | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
index f734033..0f8ba77 100644
--- a/scripts/Makefile.extrawarn
+++ b/scripts/Makefile.extrawarn
@@ -25,6 +25,7 @@ warning-1 += -Wold-style-definition
 warning-1 += $(call cc-option, -Wmissing-include-dirs)
 warning-1 += $(call cc-option, -Wunused-but-set-variable)
 warning-1 += $(call cc-disable-warning, missing-field-initializers)
+warning-1 += $(call cc-disable-warning, sign-compare)

 warning-2 := -Waggregate-return
 warning-2 += -Wcast-align
@@ -33,6 +34,7 @@ warning-2 += -Wnested-externs
 warning-2 += -Wshadow
 warning-2 += $(call cc-option, -Wlogical-op)
 warning-2 += $(call cc-option, -Wmissing-field-initializers)
+warning-2 += $(call cc-option, -Wsign-compare)

 warning-3 := -Wbad-function-cast
 warning-3 += -Wcast-qual
--
1.9.1