[patch 00/10] s390 bux fixes for 2.6.25-rc4.

[patch 00/10] s390 bux fixes for 2.6.25-rc4.

[Martin Schwidefsky]

Assorted bug fixes for s390. The shortlog:

Christian Borntraeger (1):
      [S390] sclp_vt220: speed up console output for interactive work

Heiko Carstens (3):
      [S390] idle: Fix machine check handling in idle loop.
      [S390] Get rid of memcpy gcc warning workaround.
      [S390] Fix IPL from NSS.

Hongjie Yang (1):
      [S390] incorrect reipl nss name.

Martin Schwidefsky (1):
      [S390] Update default configuration.

Michael Holzheu (1):
      [S390] Load disabled wait psw if reipl fails.

Ralph Wuerthner (1):
      [S390] zcrypt: fix ap_device_list handling

Stefan Weinhuber (2):
      [S390] dasd: let dasd erp matching recognize alias recovery
      [S390] dasd: fix reference counting in display method for proc/dasd/devices

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

[patch 01/10] Update default configuration.

[Martin Schwidefsky]

[-- Attachment #1: 001-defconfig.diff --]
[-- Type: text/plain, Size: 2485 bytes --]

From: Martin Schwidefsky <schwidefsky@de.ibm.com>

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

 arch/s390/defconfig |   18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

Index: quilt-2.6/arch/s390/defconfig
===================================================================
--- quilt-2.6.orig/arch/s390/defconfig
+++ quilt-2.6/arch/s390/defconfig
@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
-# Linux kernel version: 2.6.24
-# Sat Feb  9 12:13:01 2008
+# Linux kernel version: 2.6.25-rc4
+# Wed Mar  5 11:22:59 2008
 #
 CONFIG_MMU=y
 CONFIG_ZONE_DMA=y
@@ -43,12 +43,15 @@ CONFIG_CGROUPS=y
 # CONFIG_CGROUP_DEBUG is not set
 CONFIG_CGROUP_NS=y
 # CONFIG_CPUSETS is not set
+CONFIG_GROUP_SCHED=y
 CONFIG_FAIR_GROUP_SCHED=y
-CONFIG_FAIR_USER_SCHED=y
-# CONFIG_FAIR_CGROUP_SCHED is not set
+# CONFIG_RT_GROUP_SCHED is not set
+CONFIG_USER_SCHED=y
+# CONFIG_CGROUP_SCHED is not set
 # CONFIG_CGROUP_CPUACCT is not set
 # CONFIG_RESOURCE_COUNTERS is not set
 CONFIG_SYSFS_DEPRECATED=y
+CONFIG_SYSFS_DEPRECATED_V2=y
 # CONFIG_RELAY is not set
 CONFIG_NAMESPACES=y
 CONFIG_UTS_NS=y
@@ -85,7 +88,9 @@ CONFIG_SLAB=y
 # CONFIG_MARKERS is not set
 CONFIG_HAVE_OPROFILE=y
 CONFIG_KPROBES=y
+CONFIG_KRETPROBES=y
 CONFIG_HAVE_KPROBES=y
+CONFIG_HAVE_KRETPROBES=y
 CONFIG_PROC_PAGE_MONITOR=y
 CONFIG_SLABINFO=y
 CONFIG_RT_MUTEXES=y
@@ -185,6 +190,7 @@ CONFIG_IPL=y
 CONFIG_IPL_VM=y
 CONFIG_BINFMT_ELF=y
 CONFIG_BINFMT_MISC=m
+CONFIG_FORCE_MAX_ZONEORDER=9
 # CONFIG_PROCESS_DEBUG is not set
 CONFIG_PFAULT=y
 # CONFIG_SHARED_KERNEL is not set
@@ -435,6 +441,7 @@ CONFIG_DASD_EER=y
 CONFIG_MISC_DEVICES=y
 # CONFIG_EEPROM_93CX6 is not set
 # CONFIG_ENCLOSURE_SERVICES is not set
+# CONFIG_HAVE_IDE is not set
 
 #
 # SCSI device support
@@ -593,6 +600,7 @@ CONFIG_S390_VMUR=m
 #
 # Sonics Silicon Backplane
 #
+# CONFIG_MEMSTICK is not set
 
 #
 # File systems
@@ -750,7 +758,6 @@ CONFIG_DEBUG_BUGVERBOSE=y
 # CONFIG_DEBUG_LIST is not set
 # CONFIG_DEBUG_SG is not set
 # CONFIG_FRAME_POINTER is not set
-CONFIG_FORCED_INLINING=y
 # CONFIG_RCU_TORTURE_TEST is not set
 # CONFIG_KPROBES_SANITY_TEST is not set
 # CONFIG_BACKTRACE_SELF_TEST is not set
@@ -759,6 +766,7 @@ CONFIG_FORCED_INLINING=y
 # CONFIG_LATENCYTOP is not set
 CONFIG_SAMPLES=y
 # CONFIG_SAMPLE_KOBJECT is not set
+# CONFIG_SAMPLE_KPROBES is not set
 # CONFIG_DEBUG_PAGEALLOC is not set
 
 #

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

[patch 02/10] idle: Fix machine check handling in idle loop.

[Martin Schwidefsky]

[-- Attachment #1: 002-idle-mcck.diff --]
[-- Type: text/plain, Size: 1640 bytes --]

From: Heiko Carstens <heiko.carstens@de.ibm.com>

If a machine check handling is pending when the idle loop is entered
default_idle will be left with timer ticks and virtual timer disabled.
Fix this by "calling" the idle_chain. Also a BUG_ON(!in_interrupt) in
start_hz_timer must be removed since the function now gets called from
non interrupt context as well.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

 arch/s390/kernel/process.c |    4 ++++
 arch/s390/kernel/time.c    |    2 --
 2 files changed, 4 insertions(+), 2 deletions(-)

Index: quilt-2.6/arch/s390/kernel/process.c
===================================================================
--- quilt-2.6.orig/arch/s390/kernel/process.c
+++ quilt-2.6/arch/s390/kernel/process.c
@@ -152,6 +152,10 @@ static void default_idle(void)
 	local_mcck_disable();
 	if (test_thread_flag(TIF_MCCK_PENDING)) {
 		local_mcck_enable();
+		/* disable monitor call class 0 */
+		__ctl_clear_bit(8, 15);
+		atomic_notifier_call_chain(&idle_chain, S390_CPU_NOT_IDLE,
+					   hcpu);
 		local_irq_enable();
 		s390_handle_mcck();
 		return;
Index: quilt-2.6/arch/s390/kernel/time.c
===================================================================
--- quilt-2.6.orig/arch/s390/kernel/time.c
+++ quilt-2.6/arch/s390/kernel/time.c
@@ -209,8 +209,6 @@ static void stop_hz_timer(void)
  */
 static void start_hz_timer(void)
 {
-	BUG_ON(!in_interrupt());
-
 	if (!cpu_isset(smp_processor_id(), nohz_cpu_mask))
 		return;
 	account_ticks(get_clock());

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

[patch 03/10] Get rid of memcpy gcc warning workaround.

[Martin Schwidefsky]

[-- Attachment #1: 003-memcpy-warning.diff --]
[-- Type: text/plain, Size: 2064 bytes --]

From: Heiko Carstens <heiko.carstens@de.ibm.com>

Compile smp.o with -Wno-nonnull so gcc stops warning about memcpy
being used with a null parameter. Also remove the workaround code
and use a char * cast instead of a void * cast to do computations.

Cc: Bastian Blank <bastian@waldi.eu.org>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

 arch/s390/kernel/Makefile |    5 +++++
 arch/s390/kernel/smp.c    |   10 ++--------
 2 files changed, 7 insertions(+), 8 deletions(-)

Index: quilt-2.6/arch/s390/kernel/Makefile
===================================================================
--- quilt-2.6.orig/arch/s390/kernel/Makefile
+++ quilt-2.6/arch/s390/kernel/Makefile
@@ -4,6 +4,11 @@
 
 EXTRA_AFLAGS	:= -traditional
 
+#
+# Passing null pointers is ok for smp code, since we access the lowcore here.
+#
+CFLAGS_smp.o	:= -Wno-nonnull
+
 obj-y	:=  bitmap.o traps.o time.o process.o base.o early.o \
             setup.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o \
 	    semaphore.o s390_ext.o debug.o irq.o ipl.o dis.o diag.o
Index: quilt-2.6/arch/s390/kernel/smp.c
===================================================================
--- quilt-2.6.orig/arch/s390/kernel/smp.c
+++ quilt-2.6/arch/s390/kernel/smp.c
@@ -629,14 +629,8 @@ static int __cpuinit smp_alloc_lowcore(i
 	panic_stack = __get_free_page(GFP_KERNEL);
 	if (!panic_stack || !async_stack)
 		goto out;
-	/*
-	 * Only need to copy the first 512 bytes from address 0. But since
-	 * the compiler emits a warning if src == NULL for memcpy use copy_page
-	 * instead. Copies more than needed but this code is not performance
-	 * critical.
-	 */
-	copy_page(lowcore, &S390_lowcore);
-	memset((void *)lowcore + 512, 0, sizeof(*lowcore) - 512);
+	memcpy(lowcore, &S390_lowcore, 512);
+	memset((char *)lowcore + 512, 0, sizeof(*lowcore) - 512);
 	lowcore->async_stack = async_stack + ASYNC_SIZE;
 	lowcore->panic_stack = panic_stack + PAGE_SIZE;
 

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

[patch 04/10] dasd: let dasd erp matching recognize alias recovery

[Martin Schwidefsky]

[-- Attachment #1: 004-dasd-erp.diff --]
[-- Type: text/plain, Size: 1341 bytes --]

From: Stefan Weinhuber <wein@de.ibm.com>

When a request fails that was started on an alias device then the
first recovery step is to retry it on the base device. If the
recovery request fails again with the same symptoms, the next step
should not be a simple retry, but should be a proper recovery based
on sense data, etc. To do so, the dasd recovery functions need to
recognize the alias recovery step in the erp chain by comparing
the start devices.

Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

 drivers/s390/block/dasd_3990_erp.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

Index: quilt-2.6/drivers/s390/block/dasd_3990_erp.c
===================================================================
--- quilt-2.6.orig/drivers/s390/block/dasd_3990_erp.c
+++ quilt-2.6/drivers/s390/block/dasd_3990_erp.c
@@ -2310,10 +2310,8 @@ static int
 dasd_3990_erp_error_match(struct dasd_ccw_req *cqr1, struct dasd_ccw_req *cqr2)
 {
 
-	/* check failed CCW */
-	if (cqr1->irb.scsw.cpa != cqr2->irb.scsw.cpa) {
-		//	return 0;	/* CCW doesn't match */
-	}
+	if (cqr1->startdev != cqr2->startdev)
+		return 0;
 
 	if (cqr1->irb.esw.esw0.erw.cons != cqr2->irb.esw.esw0.erw.cons)
 		return 0;

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

[patch 05/10] dasd: fix reference counting in display method for proc/dasd/devices

[Martin Schwidefsky]

[-- Attachment #1: 005-dasd-refcount.diff --]
[-- Type: text/plain, Size: 1136 bytes --]

From: Stefan Weinhuber <wein@de.ibm.com>

Using the /proc/dasd/devices interface leaves the reference counter
of alias devices in an inconsistent state. A process that tries to set
such a device offline afterwards will hang.
The dasd_devices_show function returns immediately for alias devices
and this code path was missing a dasd_put_device call.

Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

 drivers/s390/block/dasd_proc.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: quilt-2.6/drivers/s390/block/dasd_proc.c
===================================================================
--- quilt-2.6.orig/drivers/s390/block/dasd_proc.c
+++ quilt-2.6/drivers/s390/block/dasd_proc.c
@@ -62,8 +62,10 @@ dasd_devices_show(struct seq_file *m, vo
 		return 0;
 	if (device->block)
 		block = device->block;
-	else
+	else {
+		dasd_put_device(device);
 		return 0;
+	}
 	/* Print device number. */
 	seq_printf(m, "%s", device->cdev->dev.bus_id);
 	/* Print discipline string. */

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

[patch 06/10] sclp_vt220: speed up console output for interactive work

[Martin Schwidefsky]

[-- Attachment #1: 006-vt220-speedup.diff --]
[-- Type: text/plain, Size: 1001 bytes --]

From: Christian Borntraeger <borntraeger@de.ibm.com>

Currently an output buffer can wait up to HZ/2 until the buffer is
flushed. The wait time is noticeable in interactive tools like mc.

Change the value to HZ/20, which seems enough for interactive work.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

 drivers/s390/char/sclp_vt220.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: quilt-2.6/drivers/s390/char/sclp_vt220.c
===================================================================
--- quilt-2.6.orig/drivers/s390/char/sclp_vt220.c
+++ quilt-2.6/drivers/s390/char/sclp_vt220.c
@@ -367,7 +367,7 @@ sclp_vt220_timeout(unsigned long data)
 	sclp_vt220_emit_current();
 }
 
-#define BUFFER_MAX_DELAY	HZ/2
+#define BUFFER_MAX_DELAY	HZ/20
 
 /* 
  * Internal implementation of the write function. Write COUNT bytes of data

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

[patch 07/10] zcrypt: fix ap_device_list handling

[Martin Schwidefsky]

[-- Attachment #1: 007-crypto-probe.diff --]
[-- Type: text/plain, Size: 1622 bytes --]

From: Ralph Wuerthner <rwuerthn@de.ibm.com>

In ap_device_probe() we can add the new ap device to the internal 
device list only if the device probe function successfully returns. 
Otherwise we might end up with an invalid device in the internal ap 
device list.

Signed-off-by: Ralph Wuerthner <rwuerthn@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

 drivers/s390/crypto/ap_bus.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

Index: quilt-2.6/drivers/s390/crypto/ap_bus.c
===================================================================
--- quilt-2.6.orig/drivers/s390/crypto/ap_bus.c
+++ quilt-2.6/drivers/s390/crypto/ap_bus.c
@@ -490,10 +490,12 @@ static int ap_device_probe(struct device
 	int rc;
 
 	ap_dev->drv = ap_drv;
-	spin_lock_bh(&ap_device_lock);
-	list_add(&ap_dev->list, &ap_device_list);
-	spin_unlock_bh(&ap_device_lock);
 	rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV;
+	if (!rc) {
+		spin_lock_bh(&ap_device_lock);
+		list_add(&ap_dev->list, &ap_device_list);
+		spin_unlock_bh(&ap_device_lock);
+	}
 	return rc;
 }
 
@@ -532,11 +534,11 @@ static int ap_device_remove(struct devic
 
 	ap_flush_queue(ap_dev);
 	del_timer_sync(&ap_dev->timeout);
-	if (ap_drv->remove)
-		ap_drv->remove(ap_dev);
 	spin_lock_bh(&ap_device_lock);
 	list_del_init(&ap_dev->list);
 	spin_unlock_bh(&ap_device_lock);
+	if (ap_drv->remove)
+		ap_drv->remove(ap_dev);
 	spin_lock_bh(&ap_dev->lock);
 	atomic_sub(ap_dev->queue_count, &ap_poll_requests);
 	spin_unlock_bh(&ap_dev->lock);

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

[patch 08/10] Fix IPL from NSS.

[Martin Schwidefsky]

[-- Attachment #1: 008-maxorder.diff --]
[-- Type: text/plain, Size: 1091 bytes --]

From: Heiko Carstens <heiko.carstens@de.ibm.com>

IPL from NSS didn't work because the memory detection routine omits any
memory sections with a size lower than what MAX_ORDER defines.
This causes the detection routine to skip the first memory segment which
has a size of 1MB. Which later on will let the kernel think that there
is no memory available at all.
Since in addition the z/VM memory increment size is 1MB force MAX_ORDER
to be 9, so we can support 1MB segments.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

 arch/s390/Kconfig |    4 ++++
 1 file changed, 4 insertions(+)

Index: quilt-2.6/arch/s390/Kconfig
===================================================================
--- quilt-2.6.orig/arch/s390/Kconfig
+++ quilt-2.6/arch/s390/Kconfig
@@ -351,6 +351,10 @@ endchoice
 
 source "fs/Kconfig.binfmt"
 
+config FORCE_MAX_ZONEORDER
+	int
+	default "9"
+
 config PROCESS_DEBUG
 	bool "Show crashed user process info"
 	help

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

[patch 09/10] Load disabled wait psw if reipl fails.

[Martin Schwidefsky]

[-- Attachment #1: 009-reipl-fail.diff --]
[-- Type: text/plain, Size: 750 bytes --]

From: Michael Holzheu <holzheu@de.ibm.com>

Normally this should not happen, but it's cleaner to do it that way.

Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

 arch/s390/kernel/ipl.c |    1 +
 1 file changed, 1 insertion(+)

Index: quilt-2.6/arch/s390/kernel/ipl.c
===================================================================
--- quilt-2.6.orig/arch/s390/kernel/ipl.c
+++ quilt-2.6/arch/s390/kernel/ipl.c
@@ -704,6 +704,7 @@ void reipl_run(struct shutdown_trigger *
 	default:
 		break;
 	}
+	disabled_wait((unsigned long) __builtin_return_address(0));
 }
 
 static void __init reipl_probe(void)

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

[patch 10/10] incorrect reipl nss name.

[Martin Schwidefsky]

[-- Attachment #1: 010-nssname.diff --]
[-- Type: text/plain, Size: 1148 bytes --]

From: Hongjie Yang <hongjie@us.ibm.com>

/sys/firmware/reipl/nss/name contains the nss name when defsys or
savesys command has been executed. If the defsys or savesys command
fails the kernel_nss_name has to be cleared since a reipl on that
nss name won't be possible.

Signed-off-by: Hongjie Yang <hongjie@us.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

 arch/s390/kernel/early.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

Index: quilt-2.6/arch/s390/kernel/early.c
===================================================================
--- quilt-2.6.orig/arch/s390/kernel/early.c
+++ quilt-2.6/arch/s390/kernel/early.c
@@ -88,13 +88,17 @@ static noinline __init void create_kerne
 
 	__cpcmd(defsys_cmd, NULL, 0, &response);
 
-	if (response != 0)
+	if (response != 0) {
+		kernel_nss_name[0] = '\0';
 		return;
+	}
 
 	__cpcmd(savesys_cmd, NULL, 0, &response);
 
-	if (response != strlen(savesys_cmd))
+	if (response != strlen(savesys_cmd)) {
+		kernel_nss_name[0] = '\0';
 		return;
+	}
 
 	ipl_flags = IPL_NSS_VALID;
 }

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.