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Subject[patch 2/6] s390: core changes.
[patch 2/6] s390: core changes.

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

s390 core changes:
- Load pid to cr4 on context switch.
- Correct and check buffer length of cpcmd. Fix cpcmd inline assembly.
- Add missing cc clobber to do_softirq insline assembly.
- Regenerate default configuration.

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

diffstat:
arch/s390/defconfig | 13 +++++++++++--
arch/s390/kernel/asm-offsets.c | 2 ++
arch/s390/kernel/cpcmd.c | 23 ++++++++++++-----------
arch/s390/kernel/entry.S | 1 +
arch/s390/kernel/entry64.S | 1 +
arch/s390/kernel/irq.c | 2 +-
6 files changed, 28 insertions(+), 14 deletions(-)

diff -urN linux-2.6/arch/s390/defconfig linux-2.6-patched/arch/s390/defconfig
--- linux-2.6/arch/s390/defconfig 2004-10-22 13:51:34.000000000 +0200
+++ linux-2.6-patched/arch/s390/defconfig 2004-10-22 13:51:43.000000000 +0200
@@ -1,7 +1,7 @@
#
# Automatically generated make config: don't edit
-# Linux kernel version: 2.6.9-rc3
-# Fri Oct 8 19:17:35 2004
+# Linux kernel version: 2.6.9
+# Fri Oct 22 13:50:22 2004
#
CONFIG_MMU=y
CONFIG_RWSEM_XCHGADD_ALGORITHM=y
@@ -26,6 +26,7 @@
# CONFIG_AUDIT is not set
CONFIG_LOG_BUF_SHIFT=17
CONFIG_HOTPLUG=y
+CONFIG_KOBJECT_UEVENT=y
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
# CONFIG_EMBEDDED is not set
@@ -49,6 +50,7 @@
# CONFIG_MODULE_UNLOAD is not set
CONFIG_OBSOLETE_MODPARM=y
# CONFIG_MODVERSIONS is not set
+# CONFIG_MODULE_SRCVERSION_ALL is not set
CONFIG_KMOD=y

#
@@ -144,6 +146,7 @@
# SCSI low-level drivers
#
# CONFIG_SCSI_SATA is not set
+# CONFIG_SCSI_QLOGIC_1280_1040 is not set
# CONFIG_SCSI_DEBUG is not set
CONFIG_ZFCP=y
CONFIG_CCW=y
@@ -157,7 +160,9 @@
CONFIG_BLK_DEV_RAM=y
CONFIG_BLK_DEV_RAM_SIZE=4096
CONFIG_BLK_DEV_INITRD=y
+CONFIG_INITRAMFS_SOURCE=""
# CONFIG_LBD is not set
+# CONFIG_CDROM_PKTCDVD is not set

#
# S/390 block device drivers
@@ -224,6 +229,7 @@
CONFIG_S390_TAPE_34XX=m
# CONFIG_VMLOGRDR is not set
# CONFIG_MONREADER is not set
+# CONFIG_DCSS_SHM is not set

#
# Cryptographic devices
@@ -427,6 +433,7 @@
# CONFIG_DEVFS_FS is not set
# CONFIG_DEVPTS_FS_XATTR is not set
CONFIG_TMPFS=y
+# CONFIG_TMPFS_XATTR is not set
# CONFIG_HUGETLB_PAGE is not set
CONFIG_RAMFS=y

@@ -506,6 +513,7 @@
#
CONFIG_DEBUG_KERNEL=y
CONFIG_MAGIC_SYSRQ=y
+# CONFIG_SCHEDSTATS is not set
# CONFIG_DEBUG_SLAB is not set
# CONFIG_DEBUG_SPINLOCK_SLEEP is not set
# CONFIG_DEBUG_INFO is not set
@@ -513,6 +521,7 @@
#
# Security options
#
+# CONFIG_KEYS is not set
# CONFIG_SECURITY is not set

#
diff -urN linux-2.6/arch/s390/kernel/asm-offsets.c linux-2.6-patched/arch/s390/kernel/asm-offsets.c
--- linux-2.6/arch/s390/kernel/asm-offsets.c 2004-10-18 23:53:44.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/asm-offsets.c 2004-10-22 13:51:43.000000000 +0200
@@ -22,6 +22,8 @@
DEFINE(__THREAD_mm_segment,
offsetof(struct task_struct, thread.mm_segment),);
BLANK();
+ DEFINE(__TASK_pid, offsetof(struct task_struct, pid),);
+ BLANK();
DEFINE(__PER_atmid, offsetof(per_struct, lowcore.words.perc_atmid),);
DEFINE(__PER_address, offsetof(per_struct, lowcore.words.address),);
DEFINE(__PER_access_id, offsetof(per_struct, lowcore.words.access_id),);
diff -urN linux-2.6/arch/s390/kernel/cpcmd.c linux-2.6-patched/arch/s390/kernel/cpcmd.c
--- linux-2.6/arch/s390/kernel/cpcmd.c 2004-10-18 23:54:07.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/cpcmd.c 2004-10-22 13:51:43.000000000 +0200
@@ -15,7 +15,7 @@
#include <asm/system.h>

static spinlock_t cpcmd_lock = SPIN_LOCK_UNLOCKED;
-static char cpcmd_buf[128];
+static char cpcmd_buf[240];

void cpcmd(char *cmd, char *response, int rlen)
{
@@ -24,22 +24,23 @@
int cmdlen;

spin_lock_irqsave(&cpcmd_lock, flags);
- cmdlen = strlen(cmd);
- strcpy(cpcmd_buf, cmd);
- ASCEBC(cpcmd_buf, cmdlen);
+ cmdlen = strlen(cmd);
+ BUG_ON(cmdlen>240);
+ strcpy(cpcmd_buf, cmd);
+ ASCEBC(cpcmd_buf, cmdlen);

- if (response != NULL && rlen > 0) {
+ if (response != NULL && rlen > 0) {
#ifndef CONFIG_ARCH_S390X
asm volatile ("LRA 2,0(%0)\n\t"
"LR 4,%1\n\t"
"O 4,%4\n\t"
"LRA 3,0(%2)\n\t"
"LR 5,%3\n\t"
- ".long 0x83240008 # Diagnose 83\n\t"
+ ".long 0x83240008 # Diagnose X'08'\n\t"
: /* no output */
: "a" (cpcmd_buf), "d" (cmdlen),
"a" (response), "d" (rlen), "m" (mask)
- : "2", "3", "4", "5" );
+ : "cc", "2", "3", "4", "5" );
#else /* CONFIG_ARCH_S390X */
asm volatile (" lrag 2,0(%0)\n"
" lgr 4,%1\n"
@@ -47,19 +48,19 @@
" lrag 3,0(%2)\n"
" lgr 5,%3\n"
" sam31\n"
- " .long 0x83240008 # Diagnose 83\n"
+ " .long 0x83240008 # Diagnose X'08'\n"
" sam64"
: /* no output */
: "a" (cpcmd_buf), "d" (cmdlen),
"a" (response), "d" (rlen), "m" (mask)
- : "2", "3", "4", "5" );
+ : "cc", "2", "3", "4", "5" );
#endif /* CONFIG_ARCH_S390X */
EBCASC(response, rlen);
} else {
#ifndef CONFIG_ARCH_S390X
asm volatile ("LRA 2,0(%0)\n\t"
"LR 3,%1\n\t"
- ".long 0x83230008 # Diagnose 83\n\t"
+ ".long 0x83230008 # Diagnose X'08'\n\t"
: /* no output */
: "a" (cpcmd_buf), "d" (cmdlen)
: "2", "3" );
@@ -67,7 +68,7 @@
asm volatile (" lrag 2,0(%0)\n"
" lgr 3,%1\n"
" sam31\n"
- " .long 0x83230008 # Diagnose 83\n"
+ " .long 0x83230008 # Diagnose X'08'\n"
" sam64"
: /* no output */
: "a" (cpcmd_buf), "d" (cmdlen)
diff -urN linux-2.6/arch/s390/kernel/entry64.S linux-2.6-patched/arch/s390/kernel/entry64.S
--- linux-2.6/arch/s390/kernel/entry64.S 2004-10-18 23:53:37.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/entry64.S 2004-10-22 13:51:43.000000000 +0200
@@ -141,6 +141,7 @@
lg %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp
lmg %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task
stg %r3,__LC_CURRENT # __LC_CURRENT = current task struct
+ lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
lg %r3,__THREAD_info(%r3) # load thread_info from task struct
stg %r3,__LC_THREAD_INFO
aghi %r3,STACK_SIZE
diff -urN linux-2.6/arch/s390/kernel/entry.S linux-2.6-patched/arch/s390/kernel/entry.S
--- linux-2.6/arch/s390/kernel/entry.S 2004-10-18 23:53:37.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/entry.S 2004-10-22 13:51:43.000000000 +0200
@@ -144,6 +144,7 @@
l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp
lm %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task
st %r3,__LC_CURRENT # __LC_CURRENT = current task struct
+ lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
l %r3,__THREAD_info(%r3) # load thread_info from task struct
st %r3,__LC_THREAD_INFO
ahi %r3,STACK_SIZE
diff -urN linux-2.6/arch/s390/kernel/irq.c linux-2.6-patched/arch/s390/kernel/irq.c
--- linux-2.6/arch/s390/kernel/irq.c 2004-10-18 23:54:32.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/irq.c 2004-10-22 13:51:43.000000000 +0200
@@ -86,7 +86,7 @@
" la 15,0(%1)\n"
: : "a" (new), "a" (old),
"a" (__do_softirq)
- : "0", "1", "2", "3", "4", "5",
+ : "0", "1", "2", "3", "4", "5", "14",
"cc", "memory" );
} else
/* We are already on the async stack. */
-
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