[PATCH 0/2] Removing dead code

[PATCH 0/2] Removing dead code

[Christoph Egger]

Hi all!

        As part of the VAMOS[0] research project at the University of
Erlangen we are looking at multiple integrity errors in linux'
configuration system.

	I've been running a check on the arch/ia64 sourcetree for
config Items not defined in Kconfig and found 2 such cases. Sourcecode
blocks depending on these Items are not reachable from a vanilla
kernel -- dead code. I've seen such dead blocks made on purpose
e.g. while integrating new features into the kernel but generally
they're just useless.

	Each of the patches in this patchset removes on such dead
config Item, I'd be glad if you consider applying them. I've been
doing deeper analysis of such issues before and can do so again but
I'm not so sure they were fastly usefull.

        Please keep me informed of this patch getting confirmed /
merged so we can keep track of it.

Regards

        Christoph Egger

[0] http://vamos1.informatik.uni-erlangen.de/

Christoph Egger (2):
  Removing dead CONFIG_PARAVIRT_GUEST_ASM_CLOBBER_CHECK
  Removing dead CONFIG_IOMMU_DEBUG

 arch/ia64/include/asm/native/inst.h |   96 ++++++++--------------------------
 arch/ia64/kernel/pci-dma.c          |    4 --
 2 files changed, 23 insertions(+), 77 deletions(-)

[PATCH 0/2] Removing dead code

[Christoph Egger]

Hi all!

        As part of the VAMOS[0] research project at the University of
Erlangen we are looking at multiple integrity errors in linux'
configuration system.

	I've been running a check on the arch/ia64 sourcetree for
config Items not defined in Kconfig and found 2 such cases. Sourcecode
blocks depending on these Items are not reachable from a vanilla
kernel -- dead code. I've seen such dead blocks made on purpose
e.g. while integrating new features into the kernel but generally
they're just useless.

	Each of the patches in this patchset removes on such dead
config Item, I'd be glad if you consider applying them. I've been
doing deeper analysis of such issues before and can do so again but
I'm not so sure they were fastly usefull.

        Please keep me informed of this patch getting confirmed /
merged so we can keep track of it.

Regards

        Christoph Egger

[0] http://vamos1.informatik.uni-erlangen.de/

Christoph Egger (2):
  Removing dead CONFIG_PARAVIRT_GUEST_ASM_CLOBBER_CHECK
  Removing dead CONFIG_IOMMU_DEBUG

 arch/ia64/include/asm/native/inst.h |   96 ++++++++--------------------------
 arch/ia64/kernel/pci-dma.c          |    4 --
 2 files changed, 23 insertions(+), 77 deletions(-)

[PATCH 1/2] Removing dead CONFIG_PARAVIRT_GUEST_ASM_CLOBBER_CHECK

[Christoph Egger]

CONFIG_PARAVIRT_GUEST_ASM_CLOBBER_CHECK doesn't exist in Kconfig,
therefore removing all references for it from the source code.

Signed-off-by: Christoph Egger <siccegge@cs.fau.de>
---
 arch/ia64/include/asm/native/inst.h |   96 ++++++++--------------------------
 1 files changed, 23 insertions(+), 73 deletions(-)

diff --git a/arch/ia64/include/asm/native/inst.h b/arch/ia64/include/asm/native/inst.h
index d2d46ef..4800a1e 100644
--- a/arch/ia64/include/asm/native/inst.h
+++ b/arch/ia64/include/asm/native/inst.h
@@ -33,21 +33,6 @@
 #define paravirt_fsyscall_table			ia64_native_fsyscall_table
 #define paravirt_fsys_bubble_down		ia64_native_fsys_bubble_down
 
-#ifdef CONFIG_PARAVIRT_GUEST_ASM_CLOBBER_CHECK
-# define PARAVIRT_POISON	0xdeadbeefbaadf00d
-# define CLOBBER(clob)				\
-	;;					\
-	movl clob = PARAVIRT_POISON;		\
-	;;
-# define CLOBBER_PRED(pred_clob)		\
-	;;					\
-	cmp.eq pred_clob, p0 = r0, r0		\
-	;;
-#else
-# define CLOBBER(clob)			/* nothing */
-# define CLOBBER_PRED(pred_clob)	/* nothing */
-#endif
-
 #define MOV_FROM_IFA(reg)	\
 	mov reg = cr.ifa
 
@@ -70,106 +55,76 @@
 	mov reg = cr.iip
 
 #define MOV_FROM_IVR(reg, clob)	\
-	mov reg = cr.ivr	\
-	CLOBBER(clob)
+	mov reg = cr.ivr
 
 #define MOV_FROM_PSR(pred, reg, clob)	\
-(pred)	mov reg = psr			\
-	CLOBBER(clob)
+(pred)	mov reg = psr
 
 #define MOV_FROM_ITC(pred, pred_clob, reg, clob)	\
-(pred)	mov reg = ar.itc				\
-	CLOBBER(clob)					\
-	CLOBBER_PRED(pred_clob)
+(pred)	mov reg = ar.itc
 
 #define MOV_TO_IFA(reg, clob)	\
-	mov cr.ifa = reg	\
-	CLOBBER(clob)
+	mov cr.ifa = reg
 
 #define MOV_TO_ITIR(pred, reg, clob)	\
-(pred)	mov cr.itir = reg		\
-	CLOBBER(clob)
+(pred)	mov cr.itir = reg
 
 #define MOV_TO_IHA(pred, reg, clob)	\
-(pred)	mov cr.iha = reg		\
-	CLOBBER(clob)
+(pred)	mov cr.iha = reg
 
 #define MOV_TO_IPSR(pred, reg, clob)		\
-(pred)	mov cr.ipsr = reg			\
-	CLOBBER(clob)
+(pred)	mov cr.ipsr = reg
 
 #define MOV_TO_IFS(pred, reg, clob)	\
-(pred)	mov cr.ifs = reg		\
-	CLOBBER(clob)
+(pred)	mov cr.ifs = reg
 
 #define MOV_TO_IIP(reg, clob)	\
-	mov cr.iip = reg	\
-	CLOBBER(clob)
+	mov cr.iip = reg
 
 #define MOV_TO_KR(kr, reg, clob0, clob1)	\
-	mov IA64_KR(kr) = reg			\
-	CLOBBER(clob0)				\
-	CLOBBER(clob1)
+	mov IA64_KR(kr) = reg
 
 #define ITC_I(pred, reg, clob)	\
-(pred)	itc.i reg		\
-	CLOBBER(clob)
+(pred)	itc.i reg
 
 #define ITC_D(pred, reg, clob)	\
-(pred)	itc.d reg		\
-	CLOBBER(clob)
+(pred)	itc.d reg
 
 #define ITC_I_AND_D(pred_i, pred_d, reg, clob)	\
 (pred_i) itc.i reg;				\
-(pred_d) itc.d reg				\
-	CLOBBER(clob)
+(pred_d) itc.d reg
 
 #define THASH(pred, reg0, reg1, clob)		\
-(pred)	thash reg0 = reg1			\
-	CLOBBER(clob)
+(pred)	thash reg0 = reg1
 
 #define SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(clob0, clob1)		\
-	ssm psr.ic | PSR_DEFAULT_BITS					\
-	CLOBBER(clob0)							\
-	CLOBBER(clob1)							\
+	ssm psr.ic | PSR_DEFAULT_BITS \
 	;;								\
 	srlz.i /* guarantee that interruption collectin is on */	\
 	;;
 
 #define SSM_PSR_IC_AND_SRLZ_D(clob0, clob1)	\
-	ssm psr.ic				\
-	CLOBBER(clob0)				\
-	CLOBBER(clob1)				\
+	ssm psr.ic \
 	;;					\
 	srlz.d
 
 #define RSM_PSR_IC(clob)	\
-	rsm psr.ic		\
-	CLOBBER(clob)
+	rsm psr.ic
 
 #define SSM_PSR_I(pred, pred_clob, clob)	\
-(pred)	ssm psr.i				\
-	CLOBBER(clob)				\
-	CLOBBER_PRED(pred_clob)
+(pred)	ssm psr.i
 
 #define RSM_PSR_I(pred, clob0, clob1)	\
-(pred)	rsm psr.i			\
-	CLOBBER(clob0)			\
-	CLOBBER(clob1)
+(pred)	rsm psr.i
 
 #define RSM_PSR_I_IC(clob0, clob1, clob2)	\
-	rsm psr.i | psr.ic			\
-	CLOBBER(clob0)				\
-	CLOBBER(clob1)				\
-	CLOBBER(clob2)
+	rsm psr.i | psr.ic
 
 #define RSM_PSR_DT		\
 	rsm psr.dt
 
 #define RSM_PSR_BE_I(clob0, clob1)	\
-	rsm psr.be | psr.i		\
-	CLOBBER(clob0)			\
-	CLOBBER(clob1)
+	rsm psr.be | psr.i
 
 #define SSM_PSR_DT_AND_SRLZ_I	\
 	ssm psr.dt		\
@@ -177,15 +132,10 @@
 	srlz.i
 
 #define BSW_0(clob0, clob1, clob2)	\
-	bsw.0				\
-	CLOBBER(clob0)			\
-	CLOBBER(clob1)			\
-	CLOBBER(clob2)
+	bsw.0
 
 #define BSW_1(clob0, clob1)	\
-	bsw.1			\
-	CLOBBER(clob0)		\
-	CLOBBER(clob1)
+	bsw.1
 
 #define COVER	\
 	cover
-- 
1.7.0.4

[PATCH 1/2] Removing dead CONFIG_PARAVIRT_GUEST_ASM_CLOBBER_CHECK

[Christoph Egger]

CONFIG_PARAVIRT_GUEST_ASM_CLOBBER_CHECK doesn't exist in Kconfig,
therefore removing all references for it from the source code.

Signed-off-by: Christoph Egger <siccegge@cs.fau.de>
---
 arch/ia64/include/asm/native/inst.h |   96 ++++++++--------------------------
 1 files changed, 23 insertions(+), 73 deletions(-)

diff --git a/arch/ia64/include/asm/native/inst.h b/arch/ia64/include/asm/native/inst.h
index d2d46ef..4800a1e 100644
--- a/arch/ia64/include/asm/native/inst.h
+++ b/arch/ia64/include/asm/native/inst.h
@@ -33,21 +33,6 @@
 #define paravirt_fsyscall_table			ia64_native_fsyscall_table
 #define paravirt_fsys_bubble_down		ia64_native_fsys_bubble_down
 
-#ifdef CONFIG_PARAVIRT_GUEST_ASM_CLOBBER_CHECK
-# define PARAVIRT_POISON	0xdeadbeefbaadf00d
-# define CLOBBER(clob)				\
-	;;					\
-	movl clob = PARAVIRT_POISON;		\
-	;;
-# define CLOBBER_PRED(pred_clob)		\
-	;;					\
-	cmp.eq pred_clob, p0 = r0, r0		\
-	;;
-#else
-# define CLOBBER(clob)			/* nothing */
-# define CLOBBER_PRED(pred_clob)	/* nothing */
-#endif
-
 #define MOV_FROM_IFA(reg)	\
 	mov reg = cr.ifa
 
@@ -70,106 +55,76 @@
 	mov reg = cr.iip
 
 #define MOV_FROM_IVR(reg, clob)	\
-	mov reg = cr.ivr	\
-	CLOBBER(clob)
+	mov reg = cr.ivr
 
 #define MOV_FROM_PSR(pred, reg, clob)	\
-(pred)	mov reg = psr			\
-	CLOBBER(clob)
+(pred)	mov reg = psr
 
 #define MOV_FROM_ITC(pred, pred_clob, reg, clob)	\
-(pred)	mov reg = ar.itc				\
-	CLOBBER(clob)					\
-	CLOBBER_PRED(pred_clob)
+(pred)	mov reg = ar.itc
 
 #define MOV_TO_IFA(reg, clob)	\
-	mov cr.ifa = reg	\
-	CLOBBER(clob)
+	mov cr.ifa = reg
 
 #define MOV_TO_ITIR(pred, reg, clob)	\
-(pred)	mov cr.itir = reg		\
-	CLOBBER(clob)
+(pred)	mov cr.itir = reg
 
 #define MOV_TO_IHA(pred, reg, clob)	\
-(pred)	mov cr.iha = reg		\
-	CLOBBER(clob)
+(pred)	mov cr.iha = reg
 
 #define MOV_TO_IPSR(pred, reg, clob)		\
-(pred)	mov cr.ipsr = reg			\
-	CLOBBER(clob)
+(pred)	mov cr.ipsr = reg
 
 #define MOV_TO_IFS(pred, reg, clob)	\
-(pred)	mov cr.ifs = reg		\
-	CLOBBER(clob)
+(pred)	mov cr.ifs = reg
 
 #define MOV_TO_IIP(reg, clob)	\
-	mov cr.iip = reg	\
-	CLOBBER(clob)
+	mov cr.iip = reg
 
 #define MOV_TO_KR(kr, reg, clob0, clob1)	\
-	mov IA64_KR(kr) = reg			\
-	CLOBBER(clob0)				\
-	CLOBBER(clob1)
+	mov IA64_KR(kr) = reg
 
 #define ITC_I(pred, reg, clob)	\
-(pred)	itc.i reg		\
-	CLOBBER(clob)
+(pred)	itc.i reg
 
 #define ITC_D(pred, reg, clob)	\
-(pred)	itc.d reg		\
-	CLOBBER(clob)
+(pred)	itc.d reg
 
 #define ITC_I_AND_D(pred_i, pred_d, reg, clob)	\
 (pred_i) itc.i reg;				\
-(pred_d) itc.d reg				\
-	CLOBBER(clob)
+(pred_d) itc.d reg
 
 #define THASH(pred, reg0, reg1, clob)		\
-(pred)	thash reg0 = reg1			\
-	CLOBBER(clob)
+(pred)	thash reg0 = reg1
 
 #define SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(clob0, clob1)		\
-	ssm psr.ic | PSR_DEFAULT_BITS					\
-	CLOBBER(clob0)							\
-	CLOBBER(clob1)							\
+	ssm psr.ic | PSR_DEFAULT_BITS \
 	;;								\
 	srlz.i /* guarantee that interruption collectin is on */	\
 	;;
 
 #define SSM_PSR_IC_AND_SRLZ_D(clob0, clob1)	\
-	ssm psr.ic				\
-	CLOBBER(clob0)				\
-	CLOBBER(clob1)				\
+	ssm psr.ic \
 	;;					\
 	srlz.d
 
 #define RSM_PSR_IC(clob)	\
-	rsm psr.ic		\
-	CLOBBER(clob)
+	rsm psr.ic
 
 #define SSM_PSR_I(pred, pred_clob, clob)	\
-(pred)	ssm psr.i				\
-	CLOBBER(clob)				\
-	CLOBBER_PRED(pred_clob)
+(pred)	ssm psr.i
 
 #define RSM_PSR_I(pred, clob0, clob1)	\
-(pred)	rsm psr.i			\
-	CLOBBER(clob0)			\
-	CLOBBER(clob1)
+(pred)	rsm psr.i
 
 #define RSM_PSR_I_IC(clob0, clob1, clob2)	\
-	rsm psr.i | psr.ic			\
-	CLOBBER(clob0)				\
-	CLOBBER(clob1)				\
-	CLOBBER(clob2)
+	rsm psr.i | psr.ic
 
 #define RSM_PSR_DT		\
 	rsm psr.dt
 
 #define RSM_PSR_BE_I(clob0, clob1)	\
-	rsm psr.be | psr.i		\
-	CLOBBER(clob0)			\
-	CLOBBER(clob1)
+	rsm psr.be | psr.i
 
 #define SSM_PSR_DT_AND_SRLZ_I	\
 	ssm psr.dt		\
@@ -177,15 +132,10 @@
 	srlz.i
 
 #define BSW_0(clob0, clob1, clob2)	\
-	bsw.0				\
-	CLOBBER(clob0)			\
-	CLOBBER(clob1)			\
-	CLOBBER(clob2)
+	bsw.0
 
 #define BSW_1(clob0, clob1)	\
-	bsw.1			\
-	CLOBBER(clob0)		\
-	CLOBBER(clob1)
+	bsw.1
 
 #define COVER	\
 	cover
-- 
1.7.0.4

[PATCH 2/2] Removing dead CONFIG_IOMMU_DEBUG

[Christoph Egger]

CONFIG_IOMMU_DEBUG doesn't exist in Kconfig, therefore removing all
references for it from the source code.

Signed-off-by: Christoph Egger <siccegge@cs.fau.de>
---
 arch/ia64/kernel/pci-dma.c |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)

diff --git a/arch/ia64/kernel/pci-dma.c b/arch/ia64/kernel/pci-dma.c
index f6b1ff0..b70d53a 100644
--- a/arch/ia64/kernel/pci-dma.c
+++ b/arch/ia64/kernel/pci-dma.c
@@ -26,11 +26,7 @@ EXPORT_SYMBOL(bad_dma_address);
 static int iommu_sac_force __read_mostly;
 
 int no_iommu __read_mostly;
-#ifdef CONFIG_IOMMU_DEBUG
-int force_iommu __read_mostly = 1;
-#else
 int force_iommu __read_mostly;
-#endif
 
 int iommu_pass_through;
 
-- 
1.7.0.4

[PATCH 2/2] Removing dead CONFIG_IOMMU_DEBUG

[Christoph Egger]

CONFIG_IOMMU_DEBUG doesn't exist in Kconfig, therefore removing all
references for it from the source code.

Signed-off-by: Christoph Egger <siccegge@cs.fau.de>
---
 arch/ia64/kernel/pci-dma.c |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)

diff --git a/arch/ia64/kernel/pci-dma.c b/arch/ia64/kernel/pci-dma.c
index f6b1ff0..b70d53a 100644
--- a/arch/ia64/kernel/pci-dma.c
+++ b/arch/ia64/kernel/pci-dma.c
@@ -26,11 +26,7 @@ EXPORT_SYMBOL(bad_dma_address);
 static int iommu_sac_force __read_mostly;
 
 int no_iommu __read_mostly;
-#ifdef CONFIG_IOMMU_DEBUG
-int force_iommu __read_mostly = 1;
-#else
 int force_iommu __read_mostly;
-#endif
 
 int iommu_pass_through;
 
-- 
1.7.0.4

[PATCH 0/2] Removing dead code

[Christian Dietrich]

Hi all!
       
        As part of the VAMOS[0] research project at the University of
Erlangen we are looking at multiple integrity errors in linux'
configuration system.

        I've been running a check on the drivers/video sourcetree for
config Items not defined in Kconfig and found 2 such cases. Sourcecode
blocks depending on these Items are not reachable from a vanilla
kernel -- dead code. I've seen such dead blocks made on purpose
e.g. while integrating new features into the kernel but generally
they're just useless.

        Each of the patches in this patchset removes on such dead
config Item, I'd be glad if you consider applying them. I've been
doing deeper analysis of such issues before and can do so again but
I'm not so sure they were fastly usefull.

        I build the patches against a vanilla kernel in order to
try if the kernel compiles with this patches

        Please keep me informed of this patch getting confirmed /
merged so we can keep track of it.

Regards

        Christian Dietrich

[0] http://vamos1.informatik.uni-erlangen.de/

Christian Dietrich (2):
  drivers/video: Removing dead FB_VIA_CAMERA config option
  drivers/video: Removing dead FB_68328_INVERT config option

 drivers/video/68328fb.c   |    4 ----
 drivers/video/via/accel.c |   16 ----------------
 include/linux/via-core.h  |    5 +----
 3 files changed, 1 insertions(+), 24 deletions(-)

[PATCH 0/2] Removing dead code

[Christian Dietrich]

Hi all!
       
        As part of the VAMOS[0] research project at the University of
Erlangen we are looking at multiple integrity errors in linux'
configuration system.

        I've been running a check on the drivers/video sourcetree for
config Items not defined in Kconfig and found 2 such cases. Sourcecode
blocks depending on these Items are not reachable from a vanilla
kernel -- dead code. I've seen such dead blocks made on purpose
e.g. while integrating new features into the kernel but generally
they're just useless.

        Each of the patches in this patchset removes on such dead
config Item, I'd be glad if you consider applying them. I've been
doing deeper analysis of such issues before and can do so again but
I'm not so sure they were fastly usefull.

        I build the patches against a vanilla kernel in order to
try if the kernel compiles with this patches

        Please keep me informed of this patch getting confirmed /
merged so we can keep track of it.

Regards

        Christian Dietrich

[0] http://vamos1.informatik.uni-erlangen.de/

Christian Dietrich (2):
  drivers/video: Removing dead FB_VIA_CAMERA config option
  drivers/video: Removing dead FB_68328_INVERT config option

 drivers/video/68328fb.c   |    4 ----
 drivers/video/via/accel.c |   16 ----------------
 include/linux/via-core.h  |    5 +----
 3 files changed, 1 insertions(+), 24 deletions(-)

[PATCH 0/2] Removing dead code

[Christian Dietrich]

Hi all!

I merged the two patches from Christoph Egger[1] to remove the
REDWOOD_[456] config depends. And wrote a second patch, which removes
the redwood/mtd mapping module. I hope this is now acceptable to bring
it into the kernel, if this options are really dead.       

Regards

        Christian Dietrich

[0] http://vamos1.informatik.uni-erlangen.de/
[1] Message-Id: <adba61f63f4439ac17f2e428429f01ae5e65ab15.1279110895.git.siccegge@cs.fau.de>

Christian Dietrich (2):
  Remove REDWOOD_[456] config options and conditional code
  Removed redwood/mtd mapping

 arch/powerpc/platforms/40x/Kconfig |   16 ----
 drivers/mtd/maps/Kconfig           |    8 --
 drivers/mtd/maps/Makefile          |    1 -
 drivers/mtd/maps/redwood.c         |  174 ------------------------------------
 drivers/net/Kconfig                |    2 +-
 drivers/net/smc91x.h               |   37 --------
 6 files changed, 1 insertions(+), 237 deletions(-)
 delete mode 100644 drivers/mtd/maps/redwood.c

[PATCH 0/2] Removing dead code

[Christian Dietrich]

Hi all!

I merged the two patches from Christoph Egger[1] to remove the
REDWOOD_[456] config depends. And wrote a second patch, which removes
the redwood/mtd mapping module. I hope this is now acceptable to bring
it into the kernel, if this options are really dead.       

Regards

        Christian Dietrich

[0] http://vamos1.informatik.uni-erlangen.de/
[1] Message-Id: <adba61f63f4439ac17f2e428429f01ae5e65ab15.1279110895.git.siccegge@cs.fau.de>

Christian Dietrich (2):
  Remove REDWOOD_[456] config options and conditional code
  Removed redwood/mtd mapping

 arch/powerpc/platforms/40x/Kconfig |   16 ----
 drivers/mtd/maps/Kconfig           |    8 --
 drivers/mtd/maps/Makefile          |    1 -
 drivers/mtd/maps/redwood.c         |  174 ------------------------------------
 drivers/net/Kconfig                |    2 +-
 drivers/net/smc91x.h               |   37 --------
 6 files changed, 1 insertions(+), 237 deletions(-)
 delete mode 100644 drivers/mtd/maps/redwood.c