[RFC - PATCH 0/7] consolidation of BUG support code.

[RFC - PATCH 0/7] consolidation of BUG support code.

[Paul Gortmaker]

The changes shown here are to unify linux's BUG support under
the one <linux/bug.h> file.  Due to historical reasons, we have
some BUG code in bug.h and some in kernel.h -- i.e. the support for
BUILD_BUG in linux/kernel.h predates the addition of linux/bug.h,
but old code in kernel.h wasn't moved to bug.h at that time.  As
a band-aid, kernel.h was including <asm/bug.h> to pseudo link them.

This has caused confusion[1] and general yuck/WTF[2] reactions.
Here is an example that violates the principle of least surprise:

      CC      lib/string.o
      lib/string.c: In function 'strlcat':
      lib/string.c:225:2: error: implicit declaration of function 'BUILD_BUG_ON'
      make[2]: *** [lib/string.o] Error 1
      $
      $ grep linux/bug.h lib/string.c
      #include <linux/bug.h>
      $

We've included <linux/bug.h> for the BUG infrastructure and yet we
still get a compile fail!  [We've not kernel.h for BUILD_BUG_ON.]
Ugh - very confusing for someone who is new to kernel development.

With the above in mind, the goals of this changeset are:

1) find and fix any include/*.h files that were relying on the
   implicit presence of BUG code.
2) find and fix any C files that were consuming kernel.h and
   hence relying on implicitly getting some/all BUG code.
3) Move the BUG related code living in kernel.h to <linux/bug.h>
4) remove the asm/bug.h from kernel.h to finally break the chain.

During development, the order was more like 3-4, build-test, 1-2.
But to ensure that git history for bisect doesn't get needless
build failures introduced, the commits have been reorderd to fix
the problem areas in advance.

With respect to #1 -- I was wanting to avoid putting bug.h into
high usage header files.  So you will see processor.h and the
spinlock.h getting special treatment.  Others who might(?) be
considered high usage and hence maybe needing special treatment
are called out via a cmdline filter in the commit message.

Unlike the module.h cleanup[3], I've made no attempt to separate
the changes along maintainer/arch lines -- I'm assuming that if
this seems OK to folks, then it will be pulled all at once.  The
separation I did for module.h was costly and not really required.

Testing so far has been on i386, x86-64, mips, arm, powerpc,
alpha, sparc, ...    If nobody has any fundamental problems
with the underlying concept here, I'd like to put it into the
linux-next pool for 3.4 sometime soon.

Thanks,
Paul

[1] https://lkml.org/lkml/2012/1/3/90
[2] https://lkml.org/lkml/2012/1/17/414
[3] http://lwn.net/Articles/453517/

---

Paul Gortmaker (7):
  x86: relocate get/set debugreg fcns to include/asm/debugreg.
  spinlock: macroize assert_spin_locked to avoid bug.h dependency
  lib: fix implicit users of kernel.h for TAINT_WARN
  bug.h: add include of it to various implicit C users
  BUG: headers with BUG/BUG_ON etc. need linux/bug.h
  bug: consolidate BUILD_BUG_ON with other bug code
  kernel.h: doesn't explicitly use bug.h, so don't include it.

 arch/arm/mach-ux500/board-mop500-pins.c         |    1 +
 arch/mips/fw/arc/cmdline.c                      |    1 +
 arch/mips/fw/arc/identify.c                     |    1 +
 arch/powerpc/kernel/pmc.c                       |    1 +
 arch/powerpc/xmon/ppc-opc.c                     |    1 +
 arch/powerpc/xmon/spu-opc.c                     |    1 +
 arch/x86/include/asm/debugreg.h                 |   67 +++++++++++++++++++++++
 arch/x86/include/asm/paravirt.h                 |    1 +
 arch/x86/include/asm/processor.h                |   63 ---------------------
 arch/x86/kernel/cpu/common.c                    |    1 +
 arch/x86/kernel/paravirt.c                      |    1 +
 arch/x86/mm/kmemcheck/selftest.c                |    1 +
 drivers/gpu/drm/radeon/cayman_blit_shaders.c    |    1 +
 drivers/gpu/drm/radeon/evergreen_blit_shaders.c |    1 +
 drivers/gpu/drm/radeon/r600_blit_shaders.c      |    1 +
 include/asm-generic/dma-mapping-common.h        |    1 +
 include/asm-generic/pgtable.h                   |    1 +
 include/asm-generic/tlbflush.h                  |    2 +
 include/drm/ttm/ttm_memory.h                    |    1 +
 include/linux/atmdev.h                          |    1 +
 include/linux/bio.h                             |    1 +
 include/linux/bit_spinlock.h                    |    1 +
 include/linux/bug.h                             |   61 +++++++++++++++++++++
 include/linux/ceph/decode.h                     |    3 +-
 include/linux/ceph/libceph.h                    |    1 +
 include/linux/ceph/mdsmap.h                     |    1 +
 include/linux/cpumask.h                         |    1 +
 include/linux/crypto.h                          |    1 +
 include/linux/debug_locks.h                     |    1 +
 include/linux/dmaengine.h                       |    1 +
 include/linux/elfcore.h                         |    1 +
 include/linux/ext3_fs.h                         |    1 +
 include/linux/fs.h                              |    1 +
 include/linux/fsnotify.h                        |    1 +
 include/linux/gpio.h                            |    1 +
 include/linux/highmem.h                         |    1 +
 include/linux/i2o.h                             |    1 +
 include/linux/if_vlan.h                         |    1 +
 include/linux/io-mapping.h                      |    1 +
 include/linux/kernel.h                          |   62 ---------------------
 include/linux/kprobes.h                         |    1 +
 include/linux/kvm_host.h                        |    1 +
 include/linux/memory_hotplug.h                  |    1 +
 include/linux/mm.h                              |    1 +
 include/linux/mtd/cfi.h                         |    1 +
 include/linux/netdevice.h                       |    1 +
 include/linux/nilfs2_fs.h                       |    1 +
 include/linux/page-flags.h                      |    1 +
 include/linux/pid_namespace.h                   |    1 +
 include/linux/posix_acl.h                       |    1 +
 include/linux/ptrace.h                          |    1 +
 include/linux/radix-tree.h                      |    1 +
 include/linux/rcupdate.h                        |    1 +
 include/linux/regset.h                          |    1 +
 include/linux/reiserfs_fs.h                     |    1 +
 include/linux/relay.h                           |    1 +
 include/linux/scatterlist.h                     |    6 ++-
 include/linux/seq_file.h                        |    1 +
 include/linux/skbuff.h                          |    1 +
 include/linux/slub_def.h                        |    1 +
 include/linux/spinlock.h                        |    5 +--
 include/linux/ssb/ssb_driver_gige.h             |    1 +
 include/linux/swapops.h                         |    1 +
 include/linux/syscalls.h                        |    1 +
 include/linux/transport_class.h                 |    1 +
 include/linux/virtio_config.h                   |    1 +
 include/net/cfg80211.h                          |    1 +
 include/net/dst.h                               |    1 +
 include/net/ip_vs.h                             |    1 +
 include/net/mac80211.h                          |    1 +
 include/net/netns/generic.h                     |    1 +
 include/net/red.h                               |    1 +
 include/net/tcp.h                               |    1 +
 include/net/timewait_sock.h                     |    1 +
 include/net/udp.h                               |    1 +
 include/net/wpan-phy.h                          |    1 +
 include/scsi/osd_ore.h                          |    1 +
 include/scsi/scsi_transport.h                   |    1 +
 lib/average.c                                   |    1 +
 lib/bitmap.c                                    |    1 +
 lib/iommu-helper.c                              |    1 +
 lib/list_debug.c                                |    2 +
 lib/plist.c                                     |    1 +
 lib/string.c                                    |    1 +
 lib/timerqueue.c                                |    1 +
 85 files changed, 215 insertions(+), 132 deletions(-)

-- 
1.7.7.2

[PATCH 1/7] x86: relocate get/set debugreg fcns to include/asm/debugreg.

[Paul Gortmaker]

Since we already have a debugreg.h header file, move the
assoc. get/set functions to it.  In addition to it being the
logical home for them, it has a secondary advantage.  The
functions that are moved use BUG().  So we really need to
have linux/bug.h in scope.  But asm/processor.h is used about
600 times, vs. only about 15 for debugreg.h -- so adding bug.h
to the latter reduces the amount of time we'll be processing
it during a compile.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Ingo Molnar <mingo@redhat.com>
CC: "H. Peter Anvin" <hpa@zytor.com>
---
 arch/x86/include/asm/debugreg.h  |   67 ++++++++++++++++++++++++++++++++++++++
 arch/x86/include/asm/processor.h |   63 -----------------------------------
 arch/x86/kernel/cpu/common.c     |    1 +
 3 files changed, 68 insertions(+), 63 deletions(-)

diff --git a/arch/x86/include/asm/debugreg.h b/arch/x86/include/asm/debugreg.h
index b903d5e..2d91580 100644
--- a/arch/x86/include/asm/debugreg.h
+++ b/arch/x86/include/asm/debugreg.h
@@ -78,8 +78,75 @@
  */
 #ifdef __KERNEL__
 
+#include <linux/bug.h>
+
 DECLARE_PER_CPU(unsigned long, cpu_dr7);
 
+#ifndef CONFIG_PARAVIRT
+/*
+ * These special macros can be used to get or set a debugging register
+ */
+#define get_debugreg(var, register)				\
+	(var) = native_get_debugreg(register)
+#define set_debugreg(value, register)				\
+	native_set_debugreg(register, value)
+#endif
+
+static inline unsigned long native_get_debugreg(int regno)
+{
+	unsigned long val = 0;	/* Damn you, gcc! */
+
+	switch (regno) {
+	case 0:
+		asm("mov %%db0, %0" :"=r" (val));
+		break;
+	case 1:
+		asm("mov %%db1, %0" :"=r" (val));
+		break;
+	case 2:
+		asm("mov %%db2, %0" :"=r" (val));
+		break;
+	case 3:
+		asm("mov %%db3, %0" :"=r" (val));
+		break;
+	case 6:
+		asm("mov %%db6, %0" :"=r" (val));
+		break;
+	case 7:
+		asm("mov %%db7, %0" :"=r" (val));
+		break;
+	default:
+		BUG();
+	}
+	return val;
+}
+
+static inline void native_set_debugreg(int regno, unsigned long value)
+{
+	switch (regno) {
+	case 0:
+		asm("mov %0, %%db0"	::"r" (value));
+		break;
+	case 1:
+		asm("mov %0, %%db1"	::"r" (value));
+		break;
+	case 2:
+		asm("mov %0, %%db2"	::"r" (value));
+		break;
+	case 3:
+		asm("mov %0, %%db3"	::"r" (value));
+		break;
+	case 6:
+		asm("mov %0, %%db6"	::"r" (value));
+		break;
+	case 7:
+		asm("mov %0, %%db7"	::"r" (value));
+		break;
+	default:
+		BUG();
+	}
+}
+
 static inline void hw_breakpoint_disable(void)
 {
 	/* Zero the control register for HW Breakpoint */
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index aa9088c..b6f7d5a 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -472,61 +472,6 @@ struct thread_struct {
 	unsigned		io_bitmap_max;
 };
 
-static inline unsigned long native_get_debugreg(int regno)
-{
-	unsigned long val = 0;	/* Damn you, gcc! */
-
-	switch (regno) {
-	case 0:
-		asm("mov %%db0, %0" :"=r" (val));
-		break;
-	case 1:
-		asm("mov %%db1, %0" :"=r" (val));
-		break;
-	case 2:
-		asm("mov %%db2, %0" :"=r" (val));
-		break;
-	case 3:
-		asm("mov %%db3, %0" :"=r" (val));
-		break;
-	case 6:
-		asm("mov %%db6, %0" :"=r" (val));
-		break;
-	case 7:
-		asm("mov %%db7, %0" :"=r" (val));
-		break;
-	default:
-		BUG();
-	}
-	return val;
-}
-
-static inline void native_set_debugreg(int regno, unsigned long value)
-{
-	switch (regno) {
-	case 0:
-		asm("mov %0, %%db0"	::"r" (value));
-		break;
-	case 1:
-		asm("mov %0, %%db1"	::"r" (value));
-		break;
-	case 2:
-		asm("mov %0, %%db2"	::"r" (value));
-		break;
-	case 3:
-		asm("mov %0, %%db3"	::"r" (value));
-		break;
-	case 6:
-		asm("mov %0, %%db6"	::"r" (value));
-		break;
-	case 7:
-		asm("mov %0, %%db7"	::"r" (value));
-		break;
-	default:
-		BUG();
-	}
-}
-
 /*
  * Set IOPL bits in EFLAGS from given mask
  */
@@ -572,14 +517,6 @@ static inline void native_swapgs(void)
 #define __cpuid			native_cpuid
 #define paravirt_enabled()	0
 
-/*
- * These special macros can be used to get or set a debugging register
- */
-#define get_debugreg(var, register)				\
-	(var) = native_get_debugreg(register)
-#define set_debugreg(value, register)				\
-	native_set_debugreg(register, value)
-
 static inline void load_sp0(struct tss_struct *tss,
 			    struct thread_struct *thread)
 {
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index d43cad7..1925d2b 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -18,6 +18,7 @@
 #include <asm/archrandom.h>
 #include <asm/hypervisor.h>
 #include <asm/processor.h>
+#include <asm/debugreg.h>
 #include <asm/sections.h>
 #include <linux/topology.h>
 #include <linux/cpumask.h>
-- 
1.7.7.2

[PATCH 2/7] spinlock: macroize assert_spin_locked to avoid bug.h dependency

[Paul Gortmaker]

In spinlock_api_smp.h we find a define for assert_raw_spin_locked
[which uses BUG_ON].   Then assert_spin_locked (as an inline) uses
it, meaning we need bug.h  But rather than put linux/bug.h in such
a highly used file like spinlock.h, we can just make the un-raw
version also a macro.  Then the required bug.h presence is limited
just to those few files who are actually doing the assert testing.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
CC: Thomas Gleixner <tglx@linutronix.de>
---
 include/linux/spinlock.h |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)

diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index 7df6c17..3632390 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -375,10 +375,7 @@ static inline int spin_can_lock(spinlock_t *lock)
 	return raw_spin_can_lock(&lock->rlock);
 }
 
-static inline void assert_spin_locked(spinlock_t *lock)
-{
-	assert_raw_spin_locked(&lock->rlock);
-}
+#define assert_spin_locked(lock)	assert_raw_spin_locked(&(lock)->rlock)
 
 /*
  * Pull the atomic_t declaration:
-- 
1.7.7.2

[PATCH 3/7] lib: fix implicit users of kernel.h for TAINT_WARN

[Paul Gortmaker]

A pending header cleanup will cause this to show up as:

lib/average.c:38: error: 'TAINT_WARN' undeclared (first use in this function)
lib/list_debug.c:24: error: 'TAINT_WARN' undeclared (first use in this function)

and TAINT_WARN comes from include/linux/kernel.h file.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
 lib/average.c    |    1 +
 lib/list_debug.c |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/lib/average.c b/lib/average.c
index 5576c28..57c38c6 100644
--- a/lib/average.c
+++ b/lib/average.c
@@ -7,6 +7,7 @@
 
 #include <linux/module.h>
 #include <linux/average.h>
+#include <linux/kernel.h>
 #include <linux/bug.h>
 #include <linux/log2.h>
 
diff --git a/lib/list_debug.c b/lib/list_debug.c
index b8029a5..7204e61 100644
--- a/lib/list_debug.c
+++ b/lib/list_debug.c
@@ -8,6 +8,7 @@
 
 #include <linux/module.h>
 #include <linux/list.h>
+#include <linux/kernel.h>
 
 /*
  * Insert a new entry between two known consecutive entries.
-- 
1.7.7.2

[PATCH 4/7] bug.h: add include of it to various implicit C users

[Paul Gortmaker]

With bug.h currently living right in linux/kernel.h there
are files that use BUG_ON and friends but are not including
the header explicitly.  Fix them up so we can remove the
presence in kernel.h file.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
 arch/arm/mach-ux500/board-mop500-pins.c         |    1 +
 arch/mips/fw/arc/cmdline.c                      |    1 +
 arch/mips/fw/arc/identify.c                     |    1 +
 arch/powerpc/kernel/pmc.c                       |    1 +
 arch/powerpc/xmon/ppc-opc.c                     |    1 +
 arch/powerpc/xmon/spu-opc.c                     |    1 +
 arch/x86/kernel/paravirt.c                      |    1 +
 arch/x86/mm/kmemcheck/selftest.c                |    1 +
 drivers/gpu/drm/radeon/cayman_blit_shaders.c    |    1 +
 drivers/gpu/drm/radeon/evergreen_blit_shaders.c |    1 +
 drivers/gpu/drm/radeon/r600_blit_shaders.c      |    1 +
 lib/bitmap.c                                    |    1 +
 lib/iommu-helper.c                              |    1 +
 lib/list_debug.c                                |    1 +
 lib/plist.c                                     |    1 +
 lib/string.c                                    |    1 +
 lib/timerqueue.c                                |    1 +
 17 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-ux500/board-mop500-pins.c b/arch/arm/mach-ux500/board-mop500-pins.c
index 74bfcff..f5413dc 100644
--- a/arch/arm/mach-ux500/board-mop500-pins.c
+++ b/arch/arm/mach-ux500/board-mop500-pins.c
@@ -6,6 +6,7 @@
 
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/bug.h>
 
 #include <asm/mach-types.h>
 #include <plat/pincfg.h>
diff --git a/arch/mips/fw/arc/cmdline.c b/arch/mips/fw/arc/cmdline.c
index 9fdf07e..c0122a1 100644
--- a/arch/mips/fw/arc/cmdline.c
+++ b/arch/mips/fw/arc/cmdline.c
@@ -7,6 +7,7 @@
  *
  * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
  */
+#include <linux/bug.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
diff --git a/arch/mips/fw/arc/identify.c b/arch/mips/fw/arc/identify.c
index 788060a..54a33c7 100644
--- a/arch/mips/fw/arc/identify.c
+++ b/arch/mips/fw/arc/identify.c
@@ -11,6 +11,7 @@
  *
  * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
  */
+#include <linux/bug.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
diff --git a/arch/powerpc/kernel/pmc.c b/arch/powerpc/kernel/pmc.c
index a841a9d..58eaa3d 100644
--- a/arch/powerpc/kernel/pmc.c
+++ b/arch/powerpc/kernel/pmc.c
@@ -13,6 +13,7 @@
  */
 
 #include <linux/errno.h>
+#include <linux/bug.h>
 #include <linux/spinlock.h>
 #include <linux/export.h>
 
diff --git a/arch/powerpc/xmon/ppc-opc.c b/arch/powerpc/xmon/ppc-opc.c
index af3780e..6845e91 100644
--- a/arch/powerpc/xmon/ppc-opc.c
+++ b/arch/powerpc/xmon/ppc-opc.c
@@ -22,6 +22,7 @@
 
 #include <linux/stddef.h>
 #include <linux/kernel.h>
+#include <linux/bug.h>
 #include "nonstdio.h"
 #include "ppc.h"
 
diff --git a/arch/powerpc/xmon/spu-opc.c b/arch/powerpc/xmon/spu-opc.c
index 530df3d..7d37597 100644
--- a/arch/powerpc/xmon/spu-opc.c
+++ b/arch/powerpc/xmon/spu-opc.c
@@ -19,6 +19,7 @@
    51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
 
 #include <linux/kernel.h>
+#include <linux/bug.h>
 #include "spu.h"
 
 /* This file holds the Spu opcode table */
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index d90272e..83e7b81 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -26,6 +26,7 @@
 
 #include <asm/bug.h>
 #include <asm/paravirt.h>
+#include <asm/debugreg.h>
 #include <asm/desc.h>
 #include <asm/setup.h>
 #include <asm/pgtable.h>
diff --git a/arch/x86/mm/kmemcheck/selftest.c b/arch/x86/mm/kmemcheck/selftest.c
index 036efbe..aef7140 100644
--- a/arch/x86/mm/kmemcheck/selftest.c
+++ b/arch/x86/mm/kmemcheck/selftest.c
@@ -1,3 +1,4 @@
+#include <linux/bug.h>
 #include <linux/kernel.h>
 
 #include "opcode.h"
diff --git a/drivers/gpu/drm/radeon/cayman_blit_shaders.c b/drivers/gpu/drm/radeon/cayman_blit_shaders.c
index 7b4eeb7..19a0114 100644
--- a/drivers/gpu/drm/radeon/cayman_blit_shaders.c
+++ b/drivers/gpu/drm/radeon/cayman_blit_shaders.c
@@ -24,6 +24,7 @@
  *     Alex Deucher <alexander.deucher@amd.com>
  */
 
+#include <linux/bug.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
 
diff --git a/drivers/gpu/drm/radeon/evergreen_blit_shaders.c b/drivers/gpu/drm/radeon/evergreen_blit_shaders.c
index 3a10399..f85c0af 100644
--- a/drivers/gpu/drm/radeon/evergreen_blit_shaders.c
+++ b/drivers/gpu/drm/radeon/evergreen_blit_shaders.c
@@ -24,6 +24,7 @@
  *     Alex Deucher <alexander.deucher@amd.com>
  */
 
+#include <linux/bug.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
 
diff --git a/drivers/gpu/drm/radeon/r600_blit_shaders.c b/drivers/gpu/drm/radeon/r600_blit_shaders.c
index 2d1f6c5..3af3c64 100644
--- a/drivers/gpu/drm/radeon/r600_blit_shaders.c
+++ b/drivers/gpu/drm/radeon/r600_blit_shaders.c
@@ -24,6 +24,7 @@
  *     Alex Deucher <alexander.deucher@amd.com>
  */
 
+#include <linux/bug.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
 
diff --git a/lib/bitmap.c b/lib/bitmap.c
index 0d4a127..90a683b 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -10,6 +10,7 @@
 #include <linux/errno.h>
 #include <linux/bitmap.h>
 #include <linux/bitops.h>
+#include <linux/bug.h>
 #include <asm/uaccess.h>
 
 /*
diff --git a/lib/iommu-helper.c b/lib/iommu-helper.c
index da05331..8b1ab62 100644
--- a/lib/iommu-helper.c
+++ b/lib/iommu-helper.c
@@ -4,6 +4,7 @@
 
 #include <linux/module.h>
 #include <linux/bitmap.h>
+#include <linux/bug.h>
 
 int iommu_is_span_boundary(unsigned int index, unsigned int nr,
 			   unsigned long shift,
diff --git a/lib/list_debug.c b/lib/list_debug.c
index 7204e61..1bf2fe3 100644
--- a/lib/list_debug.c
+++ b/lib/list_debug.c
@@ -8,6 +8,7 @@
 
 #include <linux/module.h>
 #include <linux/list.h>
+#include <linux/bug.h>
 #include <linux/kernel.h>
 
 /*
diff --git a/lib/plist.c b/lib/plist.c
index a0a4da4..6ab0e52 100644
--- a/lib/plist.c
+++ b/lib/plist.c
@@ -23,6 +23,7 @@
  * information.
  */
 
+#include <linux/bug.h>
 #include <linux/plist.h>
 #include <linux/spinlock.h>
 
diff --git a/lib/string.c b/lib/string.c
index dc4a863..0573a20 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -22,6 +22,7 @@
 #include <linux/types.h>
 #include <linux/string.h>
 #include <linux/ctype.h>
+#include <linux/bug.h>
 #include <linux/module.h>
 
 #ifndef __HAVE_ARCH_STRNICMP
diff --git a/lib/timerqueue.c b/lib/timerqueue.c
index 191176a..9230231 100644
--- a/lib/timerqueue.c
+++ b/lib/timerqueue.c
@@ -25,6 +25,7 @@
 #include <linux/timerqueue.h>
 #include <linux/rbtree.h>
 #include <linux/module.h>
+#include <linux/bug.h>
 
 /**
  * timerqueue_add - Adds timer to timerqueue.
-- 
1.7.7.2

[PATCH 5/7] BUG: headers with BUG/BUG_ON etc. need linux/bug.h

[Paul Gortmaker]

If a header file is making use of BUG, BUG_ON, BUILD_BUG_ON, or any
other BUG variant in a static inline (i.e. not in a #define) then
that header really should be including <linux/bug.h> and not just
expecting it to be implicitly present.

We can make this change risk-free, since if the files using these
headers didn't have exposure to linux/bug.h already, they would have
been causing compile failures/warnings.

We might want to revisit some of these "high use" files and see
if we can avoid the bug.h include in a "clean" way, via a simple
define instead of an inline if possible.

Top ten "high use" candidates at the moment are as follows:

$ for i in `git diff --name-only ^HEAD~ HEAD|sed 's,include/,,'`; do echo $i ; C=`git grep -l $i include|wc -l` ; echo $C $i ; done |sort -n -k1 -r|head
72 linux/skbuff.h
59 linux/fs.h
50 linux/netdevice.h
40 linux/rcupdate.h
33 linux/mm.h
24 linux/scatterlist.h
20 linux/cpumask.h
15 linux/seq_file.h
14 linux/crypto.h
12 linux/dmaengine.h
$

Note that the above stats can be misleading, in that it doesn't
factor in whether one of the "includers" itself is high use.
For example, if foo.h is only used once, but the user is kernel.h,
then foo.h will be largely everywhere.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
 arch/x86/include/asm/paravirt.h          |    1 +
 include/asm-generic/dma-mapping-common.h |    1 +
 include/asm-generic/pgtable.h            |    1 +
 include/asm-generic/tlbflush.h           |    2 ++
 include/drm/ttm/ttm_memory.h             |    1 +
 include/linux/atmdev.h                   |    1 +
 include/linux/bio.h                      |    1 +
 include/linux/bit_spinlock.h             |    1 +
 include/linux/ceph/decode.h              |    3 ++-
 include/linux/ceph/libceph.h             |    1 +
 include/linux/ceph/mdsmap.h              |    1 +
 include/linux/cpumask.h                  |    1 +
 include/linux/crypto.h                   |    1 +
 include/linux/debug_locks.h              |    1 +
 include/linux/dmaengine.h                |    1 +
 include/linux/elfcore.h                  |    1 +
 include/linux/ext3_fs.h                  |    1 +
 include/linux/fs.h                       |    1 +
 include/linux/fsnotify.h                 |    1 +
 include/linux/gpio.h                     |    1 +
 include/linux/highmem.h                  |    1 +
 include/linux/i2o.h                      |    1 +
 include/linux/if_vlan.h                  |    1 +
 include/linux/io-mapping.h               |    1 +
 include/linux/kprobes.h                  |    1 +
 include/linux/kvm_host.h                 |    1 +
 include/linux/memory_hotplug.h           |    1 +
 include/linux/mm.h                       |    1 +
 include/linux/mtd/cfi.h                  |    1 +
 include/linux/netdevice.h                |    1 +
 include/linux/nilfs2_fs.h                |    1 +
 include/linux/page-flags.h               |    1 +
 include/linux/pid_namespace.h            |    1 +
 include/linux/posix_acl.h                |    1 +
 include/linux/ptrace.h                   |    1 +
 include/linux/radix-tree.h               |    1 +
 include/linux/rcupdate.h                 |    1 +
 include/linux/regset.h                   |    1 +
 include/linux/reiserfs_fs.h              |    1 +
 include/linux/relay.h                    |    1 +
 include/linux/scatterlist.h              |    6 ++++--
 include/linux/seq_file.h                 |    1 +
 include/linux/skbuff.h                   |    1 +
 include/linux/slub_def.h                 |    1 +
 include/linux/ssb/ssb_driver_gige.h      |    1 +
 include/linux/swapops.h                  |    1 +
 include/linux/syscalls.h                 |    1 +
 include/linux/transport_class.h          |    1 +
 include/linux/virtio_config.h            |    1 +
 include/net/cfg80211.h                   |    1 +
 include/net/dst.h                        |    1 +
 include/net/ip_vs.h                      |    1 +
 include/net/mac80211.h                   |    1 +
 include/net/netns/generic.h              |    1 +
 include/net/red.h                        |    1 +
 include/net/tcp.h                        |    1 +
 include/net/timewait_sock.h              |    1 +
 include/net/udp.h                        |    1 +
 include/net/wpan-phy.h                   |    1 +
 include/scsi/osd_ore.h                   |    1 +
 include/scsi/scsi_transport.h            |    1 +
 61 files changed, 66 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index a7d2db9..923b070 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -10,6 +10,7 @@
 #include <asm/paravirt_types.h>
 
 #ifndef __ASSEMBLY__
+#include <linux/bug.h>
 #include <linux/types.h>
 #include <linux/cpumask.h>
 
diff --git a/include/asm-generic/dma-mapping-common.h b/include/asm-generic/dma-mapping-common.h
index 9fa3f96..2e248d8 100644
--- a/include/asm-generic/dma-mapping-common.h
+++ b/include/asm-generic/dma-mapping-common.h
@@ -2,6 +2,7 @@
 #define _ASM_GENERIC_DMA_MAPPING_H
 
 #include <linux/kmemcheck.h>
+#include <linux/bug.h>
 #include <linux/scatterlist.h>
 #include <linux/dma-debug.h>
 #include <linux/dma-attrs.h>
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 76bff2b..236b105 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -5,6 +5,7 @@
 #ifdef CONFIG_MMU
 
 #include <linux/mm_types.h>
+#include <linux/bug.h>
 
 #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 extern int ptep_set_access_flags(struct vm_area_struct *vma,
diff --git a/include/asm-generic/tlbflush.h b/include/asm-generic/tlbflush.h
index c7af037..d6d0a88 100644
--- a/include/asm-generic/tlbflush.h
+++ b/include/asm-generic/tlbflush.h
@@ -9,6 +9,8 @@
 #error need to implement an architecture specific asm/tlbflush.h
 #endif
 
+#include <linux/bug.h>
+
 static inline void flush_tlb_mm(struct mm_struct *mm)
 {
 	BUG();
diff --git a/include/drm/ttm/ttm_memory.h b/include/drm/ttm/ttm_memory.h
index 26c1f78..d6d1da4 100644
--- a/include/drm/ttm/ttm_memory.h
+++ b/include/drm/ttm/ttm_memory.h
@@ -30,6 +30,7 @@
 
 #include <linux/workqueue.h>
 #include <linux/spinlock.h>
+#include <linux/bug.h>
 #include <linux/wait.h>
 #include <linux/errno.h>
 #include <linux/kobject.h>
diff --git a/include/linux/atmdev.h b/include/linux/atmdev.h
index f4ff882..42c471a 100644
--- a/include/linux/atmdev.h
+++ b/include/linux/atmdev.h
@@ -217,6 +217,7 @@ struct atm_cirange {
 #include <linux/wait.h> /* wait_queue_head_t */
 #include <linux/time.h> /* struct timeval */
 #include <linux/net.h>
+#include <linux/bug.h>
 #include <linux/skbuff.h> /* struct sk_buff */
 #include <linux/uio.h>
 #include <net/sock.h>
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 129a9c0..f54db08 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -23,6 +23,7 @@
 #include <linux/highmem.h>
 #include <linux/mempool.h>
 #include <linux/ioprio.h>
+#include <linux/bug.h>
 
 #ifdef CONFIG_BLOCK
 
diff --git a/include/linux/bit_spinlock.h b/include/linux/bit_spinlock.h
index ac4d9f8..3b5bafc 100644
--- a/include/linux/bit_spinlock.h
+++ b/include/linux/bit_spinlock.h
@@ -4,6 +4,7 @@
 #include <linux/kernel.h>
 #include <linux/preempt.h>
 #include <linux/atomic.h>
+#include <linux/bug.h>
 
 /*
  *  bit-based spin_lock()
diff --git a/include/linux/ceph/decode.h b/include/linux/ceph/decode.h
index c5b6939..220ae21 100644
--- a/include/linux/ceph/decode.h
+++ b/include/linux/ceph/decode.h
@@ -1,8 +1,9 @@
 #ifndef __CEPH_DECODE_H
 #define __CEPH_DECODE_H
 
-#include <asm/unaligned.h>
+#include <linux/bug.h>
 #include <linux/time.h>
+#include <asm/unaligned.h>
 
 #include "types.h"
 
diff --git a/include/linux/ceph/libceph.h b/include/linux/ceph/libceph.h
index 95bd850..e8cf0cc 100644
--- a/include/linux/ceph/libceph.h
+++ b/include/linux/ceph/libceph.h
@@ -7,6 +7,7 @@
 #include <linux/backing-dev.h>
 #include <linux/completion.h>
 #include <linux/exportfs.h>
+#include <linux/bug.h>
 #include <linux/fs.h>
 #include <linux/mempool.h>
 #include <linux/pagemap.h>
diff --git a/include/linux/ceph/mdsmap.h b/include/linux/ceph/mdsmap.h
index 4c5cb08..9935fac 100644
--- a/include/linux/ceph/mdsmap.h
+++ b/include/linux/ceph/mdsmap.h
@@ -1,6 +1,7 @@
 #ifndef _FS_CEPH_MDSMAP_H
 #define _FS_CEPH_MDSMAP_H
 
+#include <linux/bug.h>
 #include "types.h"
 
 /*
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 4f7a632..7b9b75a 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -9,6 +9,7 @@
 #include <linux/kernel.h>
 #include <linux/threads.h>
 #include <linux/bitmap.h>
+#include <linux/bug.h>
 
 typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
 
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 8a94217..d870bae 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -20,6 +20,7 @@
 #include <linux/atomic.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
+#include <linux/bug.h>
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/uaccess.h>
diff --git a/include/linux/debug_locks.h b/include/linux/debug_locks.h
index 5033fb8..94f20c1 100644
--- a/include/linux/debug_locks.h
+++ b/include/linux/debug_locks.h
@@ -3,6 +3,7 @@
 
 #include <linux/kernel.h>
 #include <linux/atomic.h>
+#include <linux/bug.h>
 #include <asm/system.h>
 
 struct task_struct;
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 679b349..a5966f6 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -23,6 +23,7 @@
 
 #include <linux/device.h>
 #include <linux/uio.h>
+#include <linux/bug.h>
 #include <linux/scatterlist.h>
 #include <linux/bitmap.h>
 #include <asm/page.h>
diff --git a/include/linux/elfcore.h b/include/linux/elfcore.h
index 394a3e0..0698c79 100644
--- a/include/linux/elfcore.h
+++ b/include/linux/elfcore.h
@@ -6,6 +6,7 @@
 #include <linux/time.h>
 #ifdef __KERNEL__
 #include <linux/user.h>
+#include <linux/bug.h>
 #endif
 #include <linux/ptrace.h>
 #include <linux/elf.h>
diff --git a/include/linux/ext3_fs.h b/include/linux/ext3_fs.h
index f957085..f5a84eef 100644
--- a/include/linux/ext3_fs.h
+++ b/include/linux/ext3_fs.h
@@ -18,6 +18,7 @@
 
 #include <linux/types.h>
 #include <linux/magic.h>
+#include <linux/bug.h>
 
 /*
  * The second extended filesystem constants/structures
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 0244082..3b94bc6 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -389,6 +389,7 @@ struct inodes_stat_t {
 #include <linux/prio_tree.h>
 #include <linux/init.h>
 #include <linux/pid.h>
+#include <linux/bug.h>
 #include <linux/mutex.h>
 #include <linux/capability.h>
 #include <linux/semaphore.h>
diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index 2a53f10..a6dfe69 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -14,6 +14,7 @@
 #include <linux/fsnotify_backend.h>
 #include <linux/audit.h>
 #include <linux/slab.h>
+#include <linux/bug.h>
 
 /*
  * fsnotify_d_instantiate - instantiate a dentry for inode
diff --git a/include/linux/gpio.h b/include/linux/gpio.h
index 38ac48b..ed5a467 100644
--- a/include/linux/gpio.h
+++ b/include/linux/gpio.h
@@ -34,6 +34,7 @@ struct gpio {
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/errno.h>
+#include <linux/bug.h>
 
 struct device;
 struct gpio_chip;
diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index 3a93f73..6ede661 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -3,6 +3,7 @@
 
 #include <linux/fs.h>
 #include <linux/kernel.h>
+#include <linux/bug.h>
 #include <linux/mm.h>
 #include <linux/uaccess.h>
 #include <linux/hardirq.h>
diff --git a/include/linux/i2o.h b/include/linux/i2o.h
index a6deef4..d23c3c2 100644
--- a/include/linux/i2o.h
+++ b/include/linux/i2o.h
@@ -24,6 +24,7 @@
 #define I2O_MAX_DRIVERS		8
 
 #include <linux/pci.h>
+#include <linux/bug.h>
 #include <linux/dma-mapping.h>
 #include <linux/string.h>
 #include <linux/slab.h>
diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 13aff1e..82097f3 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -17,6 +17,7 @@
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/rtnetlink.h>
+#include <linux/bug.h>
 
 #define VLAN_HLEN	4		/* The additional bytes (on top of the Ethernet header)
 					 * that VLAN requires.
diff --git a/include/linux/io-mapping.h b/include/linux/io-mapping.h
index e44e84f..657fab4 100644
--- a/include/linux/io-mapping.h
+++ b/include/linux/io-mapping.h
@@ -20,6 +20,7 @@
 
 #include <linux/types.h>
 #include <linux/slab.h>
+#include <linux/bug.h>
 #include <asm/io.h>
 #include <asm/page.h>
 
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index dce6e4d..b6e1f8c 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -33,6 +33,7 @@
 #include <linux/list.h>
 #include <linux/notifier.h>
 #include <linux/smp.h>
+#include <linux/bug.h>
 #include <linux/percpu.h>
 #include <linux/spinlock.h>
 #include <linux/rcupdate.h>
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 900c763..ca1b153 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -13,6 +13,7 @@
 #include <linux/spinlock.h>
 #include <linux/signal.h>
 #include <linux/sched.h>
+#include <linux/bug.h>
 #include <linux/mm.h>
 #include <linux/mmu_notifier.h>
 #include <linux/preempt.h>
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 0b8e2a7..910550f 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -4,6 +4,7 @@
 #include <linux/mmzone.h>
 #include <linux/spinlock.h>
 #include <linux/notifier.h>
+#include <linux/bug.h>
 
 struct page;
 struct zone;
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 17b27cd..b7fac5b 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -6,6 +6,7 @@
 #ifdef __KERNEL__
 
 #include <linux/gfp.h>
+#include <linux/bug.h>
 #include <linux/list.h>
 #include <linux/mmzone.h>
 #include <linux/rbtree.h>
diff --git a/include/linux/mtd/cfi.h b/include/linux/mtd/cfi.h
index d5d2ec6..37ef6b1 100644
--- a/include/linux/mtd/cfi.h
+++ b/include/linux/mtd/cfi.h
@@ -22,6 +22,7 @@
 
 #include <linux/delay.h>
 #include <linux/types.h>
+#include <linux/bug.h>
 #include <linux/interrupt.h>
 #include <linux/mtd/flashchip.h>
 #include <linux/mtd/map.h>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 0eac07c..5820638 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -33,6 +33,7 @@
 #ifdef __KERNEL__
 #include <linux/pm_qos.h>
 #include <linux/timer.h>
+#include <linux/bug.h>
 #include <linux/delay.h>
 #include <linux/atomic.h>
 #include <asm/cache.h>
diff --git a/include/linux/nilfs2_fs.h b/include/linux/nilfs2_fs.h
index 7454ad7..89bd4a4 100644
--- a/include/linux/nilfs2_fs.h
+++ b/include/linux/nilfs2_fs.h
@@ -41,6 +41,7 @@
 #include <linux/types.h>
 #include <linux/ioctl.h>
 #include <linux/magic.h>
+#include <linux/bug.h>
 
 
 #define NILFS_INODE_BMAP_SIZE	7
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index e90a673..3cfa3ad 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -6,6 +6,7 @@
 #define PAGE_FLAGS_H
 
 #include <linux/types.h>
+#include <linux/bug.h>
 #ifndef __GENERATING_BOUNDS_H
 #include <linux/mm_types.h>
 #include <generated/bounds.h>
diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index e7cf666..f5bd679 100644
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h
@@ -2,6 +2,7 @@
 #define _LINUX_PID_NS_H
 
 #include <linux/sched.h>
+#include <linux/bug.h>
 #include <linux/mm.h>
 #include <linux/threads.h>
 #include <linux/nsproxy.h>
diff --git a/include/linux/posix_acl.h b/include/linux/posix_acl.h
index b768110..11bad91 100644
--- a/include/linux/posix_acl.h
+++ b/include/linux/posix_acl.h
@@ -8,6 +8,7 @@
 #ifndef __LINUX_POSIX_ACL_H
 #define __LINUX_POSIX_ACL_H
 
+#include <linux/bug.h>
 #include <linux/slab.h>
 #include <linux/rcupdate.h>
 
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index c2f1f6a..753ee8b 100644
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -113,6 +113,7 @@
 #include <linux/compiler.h>		/* For unlikely.  */
 #include <linux/sched.h>		/* For struct task_struct.  */
 #include <linux/err.h>			/* for IS_ERR_VALUE */
+#include <linux/bug.h>			/* For BUG_ON.  */
 
 
 extern long arch_ptrace(struct task_struct *child, long request,
diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index 07e360b..e9a4823 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -22,6 +22,7 @@
 
 #include <linux/preempt.h>
 #include <linux/types.h>
+#include <linux/bug.h>
 #include <linux/kernel.h>
 #include <linux/rcupdate.h>
 
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 81c04f4..3b657f2 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -42,6 +42,7 @@
 #include <linux/lockdep.h>
 #include <linux/completion.h>
 #include <linux/debugobjects.h>
+#include <linux/bug.h>
 #include <linux/compiler.h>
 
 #ifdef CONFIG_RCU_TORTURE_TEST
diff --git a/include/linux/regset.h b/include/linux/regset.h
index 8abee65..6325e09 100644
--- a/include/linux/regset.h
+++ b/include/linux/regset.h
@@ -15,6 +15,7 @@
 
 #include <linux/compiler.h>
 #include <linux/types.h>
+#include <linux/bug.h>
 #include <linux/uaccess.h>
 struct task_struct;
 struct user_regset;
diff --git a/include/linux/reiserfs_fs.h b/include/linux/reiserfs_fs.h
index 2213ddc..6643fb0 100644
--- a/include/linux/reiserfs_fs.h
+++ b/include/linux/reiserfs_fs.h
@@ -18,6 +18,7 @@
 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/sched.h>
+#include <linux/bug.h>
 #include <linux/workqueue.h>
 #include <asm/unaligned.h>
 #include <linux/bitops.h>
diff --git a/include/linux/relay.h b/include/linux/relay.h
index a822fd7..91cacc3 100644
--- a/include/linux/relay.h
+++ b/include/linux/relay.h
@@ -15,6 +15,7 @@
 #include <linux/timer.h>
 #include <linux/wait.h>
 #include <linux/list.h>
+#include <linux/bug.h>
 #include <linux/fs.h>
 #include <linux/poll.h>
 #include <linux/kref.h>
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index 9aaf5bf..ac9586d 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -1,10 +1,12 @@
 #ifndef _LINUX_SCATTERLIST_H
 #define _LINUX_SCATTERLIST_H
 
+#include <linux/string.h>
+#include <linux/bug.h>
+#include <linux/mm.h>
+
 #include <asm/types.h>
 #include <asm/scatterlist.h>
-#include <linux/mm.h>
-#include <linux/string.h>
 #include <asm/io.h>
 
 struct sg_table {
diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h
index 44f1514..5ff2df6 100644
--- a/include/linux/seq_file.h
+++ b/include/linux/seq_file.h
@@ -3,6 +3,7 @@
 
 #include <linux/types.h>
 #include <linux/string.h>
+#include <linux/bug.h>
 #include <linux/mutex.h>
 #include <linux/cpumask.h>
 #include <linux/nodemask.h>
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 50db9b0..773ae98 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -18,6 +18,7 @@
 #include <linux/kmemcheck.h>
 #include <linux/compiler.h>
 #include <linux/time.h>
+#include <linux/bug.h>
 #include <linux/cache.h>
 
 #include <linux/atomic.h>
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index a32bcfd..ca122b3 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -8,6 +8,7 @@
  */
 #include <linux/types.h>
 #include <linux/gfp.h>
+#include <linux/bug.h>
 #include <linux/workqueue.h>
 #include <linux/kobject.h>
 
diff --git a/include/linux/ssb/ssb_driver_gige.h b/include/linux/ssb/ssb_driver_gige.h
index eba52a1..6b05dcd 100644
--- a/include/linux/ssb/ssb_driver_gige.h
+++ b/include/linux/ssb/ssb_driver_gige.h
@@ -2,6 +2,7 @@
 #define LINUX_SSB_DRIVER_GIGE_H_
 
 #include <linux/ssb/ssb.h>
+#include <linux/bug.h>
 #include <linux/pci.h>
 #include <linux/spinlock.h>
 
diff --git a/include/linux/swapops.h b/include/linux/swapops.h
index 2189d3f..792d16d 100644
--- a/include/linux/swapops.h
+++ b/include/linux/swapops.h
@@ -2,6 +2,7 @@
 #define _LINUX_SWAPOPS_H
 
 #include <linux/radix-tree.h>
+#include <linux/bug.h>
 
 /*
  * swapcache pages are stored in the swapper_space radix tree.  We want to
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 515669f..61b3e08 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -68,6 +68,7 @@ struct file_handle;
 #include <linux/aio_abi.h>
 #include <linux/capability.h>
 #include <linux/list.h>
+#include <linux/bug.h>
 #include <linux/sem.h>
 #include <asm/siginfo.h>
 #include <asm/signal.h>
diff --git a/include/linux/transport_class.h b/include/linux/transport_class.h
index 9ae8da3..11087cd 100644
--- a/include/linux/transport_class.h
+++ b/include/linux/transport_class.h
@@ -10,6 +10,7 @@
 #define _TRANSPORT_CLASS_H_
 
 #include <linux/device.h>
+#include <linux/bug.h>
 #include <linux/attribute_container.h>
 
 struct transport_container;
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 5206d65..7323a33 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -53,6 +53,7 @@
 
 #ifdef __KERNEL__
 #include <linux/err.h>
+#include <linux/bug.h>
 #include <linux/virtio.h>
 
 /**
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 15f4be7..57fc879 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -13,6 +13,7 @@
 #include <linux/netdevice.h>
 #include <linux/debugfs.h>
 #include <linux/list.h>
+#include <linux/bug.h>
 #include <linux/netlink.h>
 #include <linux/skbuff.h>
 #include <linux/nl80211.h>
diff --git a/include/net/dst.h b/include/net/dst.h
index 344c8dd..59c5d18 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -12,6 +12,7 @@
 #include <linux/netdevice.h>
 #include <linux/rtnetlink.h>
 #include <linux/rcupdate.h>
+#include <linux/bug.h>
 #include <linux/jiffies.h>
 #include <net/neighbour.h>
 #include <asm/processor.h>
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index ebe517f..2bdee51 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -16,6 +16,7 @@
 #include <linux/atomic.h>                 /* for struct atomic_t */
 #include <linux/compiler.h>
 #include <linux/timer.h>
+#include <linux/bug.h>
 
 #include <net/checksum.h>
 #include <linux/netfilter.h>		/* for union nf_inet_addr */
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index d49928b..09b5ce6 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -17,6 +17,7 @@
 #include <linux/if_ether.h>
 #include <linux/skbuff.h>
 #include <linux/device.h>
+#include <linux/bug.h>
 #include <linux/ieee80211.h>
 #include <net/cfg80211.h>
 #include <asm/unaligned.h>
diff --git a/include/net/netns/generic.h b/include/net/netns/generic.h
index 3419bf5..f92bb69 100644
--- a/include/net/netns/generic.h
+++ b/include/net/netns/generic.h
@@ -5,6 +5,7 @@
 #ifndef __NET_GENERIC_H__
 #define __NET_GENERIC_H__
 
+#include <linux/bug.h>
 #include <linux/rcupdate.h>
 
 /*
diff --git a/include/net/red.h b/include/net/red.h
index 28068ec..77d4c37 100644
--- a/include/net/red.h
+++ b/include/net/red.h
@@ -2,6 +2,7 @@
 #define __NET_SCHED_RED_H
 
 #include <linux/types.h>
+#include <linux/bug.h>
 #include <net/pkt_sched.h>
 #include <net/inet_ecn.h>
 #include <net/dsfield.h>
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 0118ea9..251eb81 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -22,6 +22,7 @@
 
 #include <linux/list.h>
 #include <linux/tcp.h>
+#include <linux/bug.h>
 #include <linux/slab.h>
 #include <linux/cache.h>
 #include <linux/percpu.h>
diff --git a/include/net/timewait_sock.h b/include/net/timewait_sock.h
index 053b3cf..8d6689c 100644
--- a/include/net/timewait_sock.h
+++ b/include/net/timewait_sock.h
@@ -12,6 +12,7 @@
 #define _TIMEWAIT_SOCK_H
 
 #include <linux/slab.h>
+#include <linux/bug.h>
 #include <net/sock.h>
 
 struct timewait_sock_ops {
diff --git a/include/net/udp.h b/include/net/udp.h
index e39592f..5d606d9 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -23,6 +23,7 @@
 #define _UDP_H
 
 #include <linux/list.h>
+#include <linux/bug.h>
 #include <net/inet_sock.h>
 #include <net/sock.h>
 #include <net/snmp.h>
diff --git a/include/net/wpan-phy.h b/include/net/wpan-phy.h
index d86fffd..ff27f1b 100644
--- a/include/net/wpan-phy.h
+++ b/include/net/wpan-phy.h
@@ -23,6 +23,7 @@
 
 #include <linux/netdevice.h>
 #include <linux/mutex.h>
+#include <linux/bug.h>
 
 struct wpan_phy {
 	struct mutex pib_lock;
diff --git a/include/scsi/osd_ore.h b/include/scsi/osd_ore.h
index f05fa82..a5f9b96 100644
--- a/include/scsi/osd_ore.h
+++ b/include/scsi/osd_ore.h
@@ -26,6 +26,7 @@
 #include <scsi/osd_attributes.h>
 #include <scsi/osd_sec.h>
 #include <linux/pnfs_osd_xdr.h>
+#include <linux/bug.h>
 
 struct ore_comp {
 	struct osd_obj_id	obj;
diff --git a/include/scsi/scsi_transport.h b/include/scsi/scsi_transport.h
index 0de32cd..af244f4 100644
--- a/include/scsi/scsi_transport.h
+++ b/include/scsi/scsi_transport.h
@@ -22,6 +22,7 @@
 
 #include <linux/transport_class.h>
 #include <linux/blkdev.h>
+#include <linux/bug.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_device.h>
 
-- 
1.7.7.2

[PATCH 6/7] bug: consolidate BUILD_BUG_ON with other bug code

[Paul Gortmaker]

The support for BUILD_BUG in linux/kernel.h predates the
addition of linux/bug.h -- with this chunk off separate,
you can run into situations where a person gets a compile
fail even when they've included linux/bug.h, like this:

    CC      lib/string.o
  lib/string.c: In function 'strlcat':
  lib/string.c:225:2: error: implicit declaration of function 'BUILD_BUG_ON'
  make[2]: *** [lib/string.o] Error 1
  $
  $ grep linux/bug.h lib/string.c
  #include <linux/bug.h>
  $

Since the above violates the principle of least surprise, move
the BUG chunks from kernel.h to bug.h so it is all together.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
 include/linux/bug.h    |   61 ++++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/kernel.h |   61 ------------------------------------------------
 2 files changed, 61 insertions(+), 61 deletions(-)

diff --git a/include/linux/bug.h b/include/linux/bug.h
index d276b55..72961c3 100644
--- a/include/linux/bug.h
+++ b/include/linux/bug.h
@@ -11,6 +11,67 @@ enum bug_trap_type {
 
 struct pt_regs;
 
+#ifdef __CHECKER__
+#define BUILD_BUG_ON_NOT_POWER_OF_2(n)
+#define BUILD_BUG_ON_ZERO(e) (0)
+#define BUILD_BUG_ON_NULL(e) ((void*)0)
+#define BUILD_BUG_ON(condition)
+#define BUILD_BUG() (0)
+#else /* __CHECKER__ */
+
+/* Force a compilation error if a constant expression is not a power of 2 */
+#define BUILD_BUG_ON_NOT_POWER_OF_2(n)			\
+	BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
+
+/* Force a compilation error if condition is true, but also produce a
+   result (of value 0 and type size_t), so the expression can be used
+   e.g. in a structure initializer (or where-ever else comma expressions
+   aren't permitted). */
+#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
+#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
+
+/**
+ * BUILD_BUG_ON - break compile if a condition is true.
+ * @condition: the condition which the compiler should know is false.
+ *
+ * If you have some code which relies on certain constants being equal, or
+ * other compile-time-evaluated condition, you should use BUILD_BUG_ON to
+ * detect if someone changes it.
+ *
+ * The implementation uses gcc's reluctance to create a negative array, but
+ * gcc (as of 4.4) only emits that error for obvious cases (eg. not arguments
+ * to inline functions).  So as a fallback we use the optimizer; if it can't
+ * prove the condition is false, it will cause a link error on the undefined
+ * "__build_bug_on_failed".  This error message can be harder to track down
+ * though, hence the two different methods.
+ */
+#ifndef __OPTIMIZE__
+#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
+#else
+extern int __build_bug_on_failed;
+#define BUILD_BUG_ON(condition)					\
+	do {							\
+		((void)sizeof(char[1 - 2*!!(condition)]));	\
+		if (condition) __build_bug_on_failed = 1;	\
+	} while(0)
+#endif
+
+/**
+ * BUILD_BUG - break compile if used.
+ *
+ * If you have some code that you expect the compiler to eliminate at
+ * build time, you should use BUILD_BUG to detect if it is
+ * unexpectedly used.
+ */
+#define BUILD_BUG()						\
+	do {							\
+		extern void __build_bug_failed(void)		\
+			__linktime_error("BUILD_BUG failed");	\
+		__build_bug_failed();				\
+	} while (0)
+
+#endif	/* __CHECKER__ */
+
 #ifdef CONFIG_GENERIC_BUG
 #include <asm-generic/bug.h>
 
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index e834342..5dba983 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -662,67 +662,6 @@ static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
 	const typeof( ((type *)0)->member ) *__mptr = (ptr);	\
 	(type *)( (char *)__mptr - offsetof(type,member) );})
 
-#ifdef __CHECKER__
-#define BUILD_BUG_ON_NOT_POWER_OF_2(n)
-#define BUILD_BUG_ON_ZERO(e) (0)
-#define BUILD_BUG_ON_NULL(e) ((void*)0)
-#define BUILD_BUG_ON(condition)
-#define BUILD_BUG() (0)
-#else /* __CHECKER__ */
-
-/* Force a compilation error if a constant expression is not a power of 2 */
-#define BUILD_BUG_ON_NOT_POWER_OF_2(n)			\
-	BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
-
-/* Force a compilation error if condition is true, but also produce a
-   result (of value 0 and type size_t), so the expression can be used
-   e.g. in a structure initializer (or where-ever else comma expressions
-   aren't permitted). */
-#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
-#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
-
-/**
- * BUILD_BUG_ON - break compile if a condition is true.
- * @condition: the condition which the compiler should know is false.
- *
- * If you have some code which relies on certain constants being equal, or
- * other compile-time-evaluated condition, you should use BUILD_BUG_ON to
- * detect if someone changes it.
- *
- * The implementation uses gcc's reluctance to create a negative array, but
- * gcc (as of 4.4) only emits that error for obvious cases (eg. not arguments
- * to inline functions).  So as a fallback we use the optimizer; if it can't
- * prove the condition is false, it will cause a link error on the undefined
- * "__build_bug_on_failed".  This error message can be harder to track down
- * though, hence the two different methods.
- */
-#ifndef __OPTIMIZE__
-#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
-#else
-extern int __build_bug_on_failed;
-#define BUILD_BUG_ON(condition)					\
-	do {							\
-		((void)sizeof(char[1 - 2*!!(condition)]));	\
-		if (condition) __build_bug_on_failed = 1;	\
-	} while(0)
-#endif
-
-/**
- * BUILD_BUG - break compile if used.
- *
- * If you have some code that you expect the compiler to eliminate at
- * build time, you should use BUILD_BUG to detect if it is
- * unexpectedly used.
- */
-#define BUILD_BUG()						\
-	do {							\
-		extern void __build_bug_failed(void)		\
-			__linktime_error("BUILD_BUG failed");	\
-		__build_bug_failed();				\
-	} while (0)
-
-#endif	/* __CHECKER__ */
-
 /* Trap pasters of __FUNCTION__ at compile-time */
 #define __FUNCTION__ (__func__)
 
-- 
1.7.7.2

[PATCH 7/7] kernel.h: doesn't explicitly use bug.h, so don't include it.

[Paul Gortmaker]

This header isn't using bug.h infrastructure, but due to historical
reasons, it was including it.  Removing it revealed several implicit
dependencies (since kernel.h is everywhere) so we've fixed those 1st
before deploying this change.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
 include/linux/kernel.h |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 5dba983..bef5480 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -20,7 +20,6 @@
 #include <linux/printk.h>
 #include <linux/dynamic_debug.h>
 #include <asm/byteorder.h>
-#include <asm/bug.h>
 
 #define USHRT_MAX	((u16)(~0U))
 #define SHRT_MAX	((s16)(USHRT_MAX>>1))
-- 
1.7.7.2

Re: [RFC - PATCH 0/7] consolidation of BUG support code.

[Stephen Rothwell]

[-- Attachment #1: Type: text/plain, Size: 2248 bytes --]

Hi Paul,

On Thu, 26 Jan 2012 21:44:25 -0500 Paul Gortmaker <paul.gortmaker@windriver.com> wrote:
>
> The changes shown here are to unify linux's BUG support under
> the one <linux/bug.h> file.  Due to historical reasons, we have
> some BUG code in bug.h and some in kernel.h -- i.e. the support for
> BUILD_BUG in linux/kernel.h predates the addition of linux/bug.h,
> but old code in kernel.h wasn't moved to bug.h at that time.  As
> a band-aid, kernel.h was including <asm/bug.h> to pseudo link them.
> With the above in mind, the goals of this changeset are:
> 
> 1) find and fix any include/*.h files that were relying on the
>    implicit presence of BUG code.
> 2) find and fix any C files that were consuming kernel.h and
>    hence relying on implicitly getting some/all BUG code.
> 3) Move the BUG related code living in kernel.h to <linux/bug.h>
> 4) remove the asm/bug.h from kernel.h to finally break the chain.
> 
> During development, the order was more like 3-4, build-test, 1-2.
> But to ensure that git history for bisect doesn't get needless
> build failures introduced, the commits have been reorderd to fix
> the problem areas in advance.

I have expressed reservations with these tree wide include file cleanups
in the past (there was going pain for me and others during the module.h
split up for example).  So, have you considered the following alternate
method of achieving most (if not all) of the gains:

First a patch that moves the BUG related stuff from kernel.h to
linux/bug.h and replacing the include of asm/bug.h with linux/bug.h in
kernel.h.  This should essentially be a noop (bar some strange
interesting bugs).

The trick is to convince Linus that this patch is OK for the current RC series ...

Then you can (at your leisure) fix all the files that need linux/bug.h
included - farming them out as required.  And we could add a check in
checkpatch.pl.

Then (either after 3.4-rc1 or in the 3.5 merge window) we can remove the
include of linux/bug.h from linux/kernel.h and fix any left over build
problems.

I have not thought about this too hard, so there may be large holes in
this plan.

-- 
Cheers,
Stephen Rothwell                    sfr@canb.auug.org.au

[-- Attachment #2: Type: application/pgp-signature, Size: 836 bytes --]

Re: [PATCH 1/7] x86: relocate get/set debugreg fcns to include/asm/debugreg.

[Ingo Molnar]

* Paul Gortmaker <paul.gortmaker@windriver.com> wrote:

> Since we already have a debugreg.h header file, move the
> assoc. get/set functions to it.  In addition to it being the
> logical home for them, it has a secondary advantage.  The
> functions that are moved use BUG().  So we really need to
> have linux/bug.h in scope.  But asm/processor.h is used about
> 600 times, vs. only about 15 for debugreg.h -- so adding bug.h
> to the latter reduces the amount of time we'll be processing
> it during a compile.
> 
> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
> CC: Thomas Gleixner <tglx@linutronix.de>
> CC: Ingo Molnar <mingo@redhat.com>
> CC: "H. Peter Anvin" <hpa@zytor.com>
> ---
>  arch/x86/include/asm/debugreg.h  |   67 ++++++++++++++++++++++++++++++++++++++
>  arch/x86/include/asm/processor.h |   63 -----------------------------------
>  arch/x86/kernel/cpu/common.c     |    1 +
>  3 files changed, 68 insertions(+), 63 deletions(-)

Acked-by: Ingo Molnar <mingo@elte.hu>

I suspect you'd like to carry this in your tree, so that all 
these patches are together?

Thanks,

	Ingo

Re: [RFC - PATCH 0/7] consolidation of BUG support code.

[Paul Gortmaker]

[Re: [RFC - PATCH 0/7] consolidation of BUG support code.] On 27/01/2012 (Fri 16:52) Stephen Rothwell wrote:

> Hi Paul,
> 
> On Thu, 26 Jan 2012 21:44:25 -0500 Paul Gortmaker <paul.gortmaker@windriver.com> wrote:
> >
> > The changes shown here are to unify linux's BUG support under
> > the one <linux/bug.h> file.  Due to historical reasons, we have
> > some BUG code in bug.h and some in kernel.h -- i.e. the support for
> > BUILD_BUG in linux/kernel.h predates the addition of linux/bug.h,
> > but old code in kernel.h wasn't moved to bug.h at that time.  As
> > a band-aid, kernel.h was including <asm/bug.h> to pseudo link them.
> > With the above in mind, the goals of this changeset are:
> > 
> > 1) find and fix any include/*.h files that were relying on the
> >    implicit presence of BUG code.
> > 2) find and fix any C files that were consuming kernel.h and
> >    hence relying on implicitly getting some/all BUG code.
> > 3) Move the BUG related code living in kernel.h to <linux/bug.h>
> > 4) remove the asm/bug.h from kernel.h to finally break the chain.
> > 
> > During development, the order was more like 3-4, build-test, 1-2.
> > But to ensure that git history for bisect doesn't get needless
> > build failures introduced, the commits have been reorderd to fix
> > the problem areas in advance.
> 
> I have expressed reservations with these tree wide include file cleanups
> in the past (there was going pain for me and others during the module.h

Well, I thought module.h went reasonably OK for something that touched
close to 2500 files.  I don't recall getting a lot of scorn and flame.
In any case, this is nowhere near that size or scope of the module.h
work, so I'll go out on a limb and say it should be nearly "pain free".

> split up for example).  So, have you considered the following alternate

> method of achieving most (if not all) of the gains:
> 
> First a patch that moves the BUG related stuff from kernel.h to
> linux/bug.h and replacing the include of asm/bug.h with linux/bug.h in
> kernel.h.  This should essentially be a noop (bar some strange
> interesting bugs).

You don't even really need the above as a prerequisite in order to start
adding bug.h to all the places that are using it.  As I noted in one of
the commit logs, things are compiling today, so files using BUG are
already getting it one way or another -- just implicitly.

> 
> The trick is to convince Linus that this patch is OK for the current RC series ...
> 
> Then you can (at your leisure) fix all the files that need linux/bug.h
> included - farming them out as required.  And we could add a check in
> checkpatch.pl.

I originally had the module.h stuff broken across maintainer lines, as
I was assuming they would need to be farmed out as chunks, when Ingo
suggested to just lump it all into one pull request and have it go at
once (and I was fine with that).  So this time I didn't bother making
things like the one include/* commit into 60-odd separate commits.

I'm not really inclined to greatly favour one way over the other.
Tracking all the one line commits to make sure they make it through
the various sub-maintainers will take a bit more effort, but if that
is what folks *really* want me to do, I'm OK with that.  It is just
that your feedback here is the 1st I've heard favouring that method
so far.

Thanks,
Paul.

> 
> Then (either after 3.4-rc1 or in the 3.5 merge window) we can remove the
> include of linux/bug.h from linux/kernel.h and fix any left over build
> problems.
> 
> I have not thought about this too hard, so there may be large holes in
> this plan.
> 
> -- 
> Cheers,
> Stephen Rothwell                    sfr@canb.auug.org.au

Re: [PATCH 1/7] x86: relocate get/set debugreg fcns to include/asm/debugreg.

[Paul Gortmaker]

[Re: [PATCH 1/7] x86: relocate get/set debugreg fcns to include/asm/debugreg.] On 27/01/2012 (Fri 12:51) Ingo Molnar wrote:

> 
> * Paul Gortmaker <paul.gortmaker@windriver.com> wrote:
> 
> > Since we already have a debugreg.h header file, move the
> > assoc. get/set functions to it.  In addition to it being the
> > logical home for them, it has a secondary advantage.  The
> > functions that are moved use BUG().  So we really need to
> > have linux/bug.h in scope.  But asm/processor.h is used about
> > 600 times, vs. only about 15 for debugreg.h -- so adding bug.h
> > to the latter reduces the amount of time we'll be processing
> > it during a compile.
> > 
> > Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
> > CC: Thomas Gleixner <tglx@linutronix.de>
> > CC: Ingo Molnar <mingo@redhat.com>
> > CC: "H. Peter Anvin" <hpa@zytor.com>
> > ---
> >  arch/x86/include/asm/debugreg.h  |   67 ++++++++++++++++++++++++++++++++++++++
> >  arch/x86/include/asm/processor.h |   63 -----------------------------------
> >  arch/x86/kernel/cpu/common.c     |    1 +
> >  3 files changed, 68 insertions(+), 63 deletions(-)
> 
> Acked-by: Ingo Molnar <mingo@elte.hu>
> 
> I suspect you'd like to carry this in your tree, so that all 
> these patches are together?

Yes, that was my original intent, unless there is a consensus
from people indicating that they'd really rather not see such
standalone cleanup trees exist at all.

Thanks,
Paul.

> 
> Thanks,
> 
> 	Ingo