Patch "arm64: define BUG() instruction without CONFIG_BUG" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    arm64: define BUG() instruction without CONFIG_BUG

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm64-define-bug-instruction-without-config_bug.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From f13d52cb3fad03c237572be2ee691e1fe2d1d7bb Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 14 Mar 2017 22:39:21 +0100
Subject: arm64: define BUG() instruction without CONFIG_BUG

From: Arnd Bergmann <arnd@arndb.de>

commit f13d52cb3fad03c237572be2ee691e1fe2d1d7bb upstream.

This mirrors commit e9c38ceba8d9 ("ARM: 8455/1: define __BUG as
asm(BUG_INSTR) without CONFIG_BUG") to make the behavior of
arm64 consistent with arm and x86, and avoids lots of warnings in
randconfig builds, such as:

kernel/seccomp.c: In function '__seccomp_filter':
kernel/seccomp.c:666:1: error: no return statement in function returning non-void [-Werror=return-type]

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm64/include/asm/bug.h |   35 ++++++++++++++++++++---------------
 1 file changed, 20 insertions(+), 15 deletions(-)

--- a/arch/arm64/include/asm/bug.h
+++ b/arch/arm64/include/asm/bug.h
@@ -20,9 +20,6 @@
 
 #include <asm/brk-imm.h>
 
-#ifdef CONFIG_GENERIC_BUG
-#define HAVE_ARCH_BUG
-
 #ifdef CONFIG_DEBUG_BUGVERBOSE
 #define _BUGVERBOSE_LOCATION(file, line) __BUGVERBOSE_LOCATION(file, line)
 #define __BUGVERBOSE_LOCATION(file, line)				\
@@ -36,28 +33,36 @@
 #define _BUGVERBOSE_LOCATION(file, line)
 #endif
 
-#define _BUG_FLAGS(flags) __BUG_FLAGS(flags)
+#ifdef CONFIG_GENERIC_BUG
 
-#define __BUG_FLAGS(flags) asm volatile (		\
+#define __BUG_ENTRY(flags) 				\
 		".pushsection __bug_table,\"a\"\n\t"	\
 		".align 2\n\t"				\
 	"0:	.long 1f - 0b\n\t"			\
 _BUGVERBOSE_LOCATION(__FILE__, __LINE__)		\
 		".short " #flags "\n\t"			\
 		".popsection\n"				\
-							\
-	"1:	brk %[imm]"				\
-		:: [imm] "i" (BUG_BRK_IMM)		\
-)
-
-#define BUG() do {				\
-	_BUG_FLAGS(0);				\
-	unreachable();				\
+	"1:	"
+#else
+#define __BUG_ENTRY(flags) ""
+#endif
+
+#define __BUG_FLAGS(flags)				\
+	asm volatile (					\
+		__BUG_ENTRY(flags)			\
+		"brk %[imm]" :: [imm] "i" (BUG_BRK_IMM)	\
+	);
+
+
+#define BUG() do {					\
+	__BUG_FLAGS(0);					\
+	unreachable();					\
 } while (0)
 
-#define __WARN_TAINT(taint) _BUG_FLAGS(BUGFLAG_TAINT(taint))
+#define __WARN_TAINT(taint) 				\
+	__BUG_FLAGS(BUGFLAG_TAINT(taint))
 
-#endif /* ! CONFIG_GENERIC_BUG */
+#define HAVE_ARCH_BUG
 
 #include <asm-generic/bug.h>
 


Patches currently in stable-queue which might be from arnd@arndb.de are

queue-4.9/kasan-rework-kconfig-settings.patch
queue-4.9/tw5864-use-dev_warn-instead-of-warn-to-shut-up-warning.patch
queue-4.9/perf-x86-shut-up-false-positive-wmaybe-uninitialized-warning.patch
queue-4.9/go7007-add-media_camera_support-dependency.patch
queue-4.9/scsi-advansys-fix-build-warning-for-pci-n.patch
queue-4.9/video-fbdev-via-remove-possibly-unused-variables.patch
queue-4.9/drm-exynos-mark-pm-functions-as-__maybe_unused.patch
queue-4.9/binfmt_elf-compat-avoid-unused-function-warning.patch
queue-4.9/idle-i7300-add-pci-dependency.patch
queue-4.9/cw1200-fix-bogus-maybe-uninitialized-warning.patch
queue-4.9/x86-build-silence-the-build-with-make-s.patch
queue-4.9/gpio-xgene-mark-pm-functions-as-__maybe_unused.patch
queue-4.9/kvm-add-x86_local_apic-dependency.patch
queue-4.9/reiserfs-avoid-a-wmaybe-uninitialized-warning.patch
queue-4.9/scsi-advansys-fix-uninitialized-data-access.patch
queue-4.9/drm-i915-fix-intel_backlight_device_register-declaration.patch
queue-4.9/spi-bcm-qspi-shut-up-warning-about-cfi-header-inclusion.patch
queue-4.9/asoc-ux500-add-module_license-tag.patch
queue-4.9/x86-microcode-amd-change-load_microcode_amd-s-param-to-bool-to-fix-preemptibility-bug.patch
queue-4.9/video-fbdev-mmp-add-module_license.patch
queue-4.9/usb-phy-msm-add-regulator-dependency.patch
queue-4.9/arm64-dts-add-cooling-cells-to-cpu-nodes.patch
queue-4.9/vmxnet3-prevent-building-with-64k-pages.patch
queue-4.9/x86-platform-add-pci-dependency-for-punit_atom_debug.patch
queue-4.9/alsa-hda-ca0132-fix-possible-null-pointer-use.patch
queue-4.9/thermal-fix-intel_soc_dts_iosf_core-dependencies.patch
queue-4.9/arm64-define-bug-instruction-without-config_bug.patch
queue-4.9/arm64-sunxi-always-enable-reset-controller.patch
queue-4.9/tc358743-fix-register-i2c_rd-wr-functions.patch
queue-4.9/security-keys-big_key-requires-config_crypto.patch
queue-4.9/drm-i915-hide-unused-intel_panel_set_backlight-function.patch
queue-4.9/x86-fpu-math-emu-fix-possible-uninitialized-variable-use.patch
queue-4.9/arm-8743-1-bl_switcher-add-module_license-tag.patch
queue-4.9/em28xx-only-use-mt9v011-if-camera-support-is-enabled.patch
queue-4.9/arm64-fix-warning-about-swapper_pg_dir-overflow.patch
queue-4.9/shmem-avoid-maybe-uninitialized-warning.patch
queue-4.9/input-tca8418_keypad-hide-gcc-4.9-wmaybe-uninitialized-warning.patch
queue-4.9/drm-nouveau-hide-gcc-4.9-wmaybe-uninitialized.patch
queue-4.9/x86-add-multiuser-dependency-for-kvm.patch
queue-4.9/isdn-eicon-reduce-stack-size-of-sig_ind-function.patch