summaryrefslogtreecommitdiffstats
path: root/arch/s390/kernel
diff options
context:
space:
mode:
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r--arch/s390/kernel/compat_ioctl.c7
-rw-r--r--arch/s390/kernel/ptrace.c5
-rw-r--r--arch/s390/kernel/s390_ksyms.c1
-rw-r--r--arch/s390/kernel/setup.c401
-rw-r--r--arch/s390/kernel/time.c12
-rw-r--r--arch/s390/kernel/vtime.c25
6 files changed, 259 insertions, 192 deletions
diff --git a/arch/s390/kernel/compat_ioctl.c b/arch/s390/kernel/compat_ioctl.c
index 96571ff7115..03d03c6d3cb 100644
--- a/arch/s390/kernel/compat_ioctl.c
+++ b/arch/s390/kernel/compat_ioctl.c
@@ -16,6 +16,7 @@
#define CODE
#include "../../../fs/compat_ioctl.c"
#include <asm/dasd.h>
+#include <asm/cmb.h>
#include <asm/tape390.h>
static int do_ioctl32_pointer(unsigned int fd, unsigned int cmd,
@@ -58,7 +59,11 @@ COMPATIBLE_IOCTL(BIODASDPRRD)
COMPATIBLE_IOCTL(BIODASDPSRD)
COMPATIBLE_IOCTL(BIODASDGATTR)
COMPATIBLE_IOCTL(BIODASDSATTR)
-
+#if defined(CONFIG_DASD_CMB) || defined(CONFIG_DASD_CMB_MODULE)
+COMPATIBLE_IOCTL(BIODASDCMFENABLE)
+COMPATIBLE_IOCTL(BIODASDCMFDISABLE)
+COMPATIBLE_IOCTL(BIODASDREADALLCMB)
+#endif
#endif
#if defined(CONFIG_S390_TAPE) || defined(CONFIG_S390_TAPE_MODULE)
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index 2d546c67f7c..26889366929 100644
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -32,6 +32,7 @@
#include <linux/user.h>
#include <linux/security.h>
#include <linux/audit.h>
+#include <linux/signal.h>
#include <asm/segment.h>
#include <asm/page.h>
@@ -609,7 +610,7 @@ do_ptrace(struct task_struct *child, long request, long addr, long data)
/* continue and stop at next (return from) syscall */
case PTRACE_CONT:
/* restart after signal. */
- if ((unsigned long) data >= _NSIG)
+ if (!valid_signal(data))
return -EIO;
if (request == PTRACE_SYSCALL)
set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
@@ -637,7 +638,7 @@ do_ptrace(struct task_struct *child, long request, long addr, long data)
case PTRACE_SINGLESTEP:
/* set the trap flag. */
- if ((unsigned long) data >= _NSIG)
+ if (!valid_signal(data))
return -EIO;
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
child->exit_code = data;
diff --git a/arch/s390/kernel/s390_ksyms.c b/arch/s390/kernel/s390_ksyms.c
index 11fd6d556d8..bee654abb6d 100644
--- a/arch/s390/kernel/s390_ksyms.c
+++ b/arch/s390/kernel/s390_ksyms.c
@@ -34,7 +34,6 @@ EXPORT_SYMBOL(__clear_user_asm);
EXPORT_SYMBOL(__strncpy_from_user_asm);
EXPORT_SYMBOL(__strnlen_user_asm);
EXPORT_SYMBOL(diag10);
-EXPORT_SYMBOL(default_storage_key);
/*
* semaphore ops
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index c879c40aa7a..df83215beac 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -44,6 +44,8 @@
#include <asm/cpcmd.h>
#include <asm/lowcore.h>
#include <asm/irq.h>
+#include <asm/page.h>
+#include <asm/ptrace.h>
/*
* Machine setup..
@@ -53,13 +55,14 @@ unsigned int console_devno = -1;
unsigned int console_irq = -1;
unsigned long memory_size = 0;
unsigned long machine_flags = 0;
-unsigned int default_storage_key = 0;
struct {
unsigned long addr, size, type;
} memory_chunk[MEMORY_CHUNKS] = { { 0 } };
#define CHUNK_READ_WRITE 0
#define CHUNK_READ_ONLY 1
volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
+unsigned long __initdata zholes_size[MAX_NR_ZONES];
+static unsigned long __initdata memory_end;
/*
* Setup options
@@ -78,11 +81,15 @@ static char command_line[COMMAND_LINE_SIZE] = { 0, };
static struct resource code_resource = {
.name = "Kernel code",
+ .start = (unsigned long) &_text,
+ .end = (unsigned long) &_etext - 1,
.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
};
static struct resource data_resource = {
.name = "Kernel data",
+ .start = (unsigned long) &_etext,
+ .end = (unsigned long) &_edata - 1,
.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
};
@@ -310,90 +317,50 @@ void machine_power_off(void)
EXPORT_SYMBOL(machine_power_off);
-/*
- * Setup function called from init/main.c just after the banner
- * was printed.
- */
-extern char _pstart, _pend, _stext;
+static void __init
+add_memory_hole(unsigned long start, unsigned long end)
+{
+ unsigned long dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
+
+ if (end <= dma_pfn)
+ zholes_size[ZONE_DMA] += end - start + 1;
+ else if (start > dma_pfn)
+ zholes_size[ZONE_NORMAL] += end - start + 1;
+ else {
+ zholes_size[ZONE_DMA] += dma_pfn - start + 1;
+ zholes_size[ZONE_NORMAL] += end - dma_pfn;
+ }
+}
-void __init setup_arch(char **cmdline_p)
+static void __init
+parse_cmdline_early(char **cmdline_p)
{
- unsigned long bootmap_size;
- unsigned long memory_start, memory_end;
- char c = ' ', cn, *to = command_line, *from = COMMAND_LINE;
- unsigned long start_pfn, end_pfn;
- static unsigned int smptrap=0;
- unsigned long delay = 0;
- struct _lowcore *lc;
- int i;
+ char c = ' ', cn, *to = command_line, *from = COMMAND_LINE;
+ unsigned long delay = 0;
- if (smptrap)
- return;
- smptrap=1;
+ /* Save unparsed command line copy for /proc/cmdline */
+ memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
+ saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
- /*
- * print what head.S has found out about the machine
- */
-#ifndef CONFIG_ARCH_S390X
- printk((MACHINE_IS_VM) ?
- "We are running under VM (31 bit mode)\n" :
- "We are running native (31 bit mode)\n");
- printk((MACHINE_HAS_IEEE) ?
- "This machine has an IEEE fpu\n" :
- "This machine has no IEEE fpu\n");
-#else /* CONFIG_ARCH_S390X */
- printk((MACHINE_IS_VM) ?
- "We are running under VM (64 bit mode)\n" :
- "We are running native (64 bit mode)\n");
-#endif /* CONFIG_ARCH_S390X */
-
- ROOT_DEV = Root_RAM0;
- memory_start = (unsigned long) &_end; /* fixit if use $CODELO etc*/
-#ifndef CONFIG_ARCH_S390X
- memory_end = memory_size & ~0x400000UL; /* align memory end to 4MB */
- /*
- * We need some free virtual space to be able to do vmalloc.
- * On a machine with 2GB memory we make sure that we have at
- * least 128 MB free space for vmalloc.
- */
- if (memory_end > 1920*1024*1024)
- memory_end = 1920*1024*1024;
-#else /* CONFIG_ARCH_S390X */
- memory_end = memory_size & ~0x200000UL; /* detected in head.s */
-#endif /* CONFIG_ARCH_S390X */
- init_mm.start_code = PAGE_OFFSET;
- init_mm.end_code = (unsigned long) &_etext;
- init_mm.end_data = (unsigned long) &_edata;
- init_mm.brk = (unsigned long) &_end;
-
- code_resource.start = (unsigned long) &_text;
- code_resource.end = (unsigned long) &_etext - 1;
- data_resource.start = (unsigned long) &_etext;
- data_resource.end = (unsigned long) &_edata - 1;
-
- /* Save unparsed command line copy for /proc/cmdline */
- memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
- saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
-
- for (;;) {
- /*
- * "mem=XXX[kKmM]" sets memsize
- */
- if (c == ' ' && strncmp(from, "mem=", 4) == 0) {
- memory_end = simple_strtoul(from+4, &from, 0);
- if ( *from == 'K' || *from == 'k' ) {
- memory_end = memory_end << 10;
- from++;
- } else if ( *from == 'M' || *from == 'm' ) {
- memory_end = memory_end << 20;
- from++;
- }
- }
- /*
- * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
- */
- if (c == ' ' && strncmp(from, "ipldelay=", 9) == 0) {
- delay = simple_strtoul(from+9, &from, 0);
+ for (;;) {
+ /*
+ * "mem=XXX[kKmM]" sets memsize
+ */
+ if (c == ' ' && strncmp(from, "mem=", 4) == 0) {
+ memory_end = simple_strtoul(from+4, &from, 0);
+ if ( *from == 'K' || *from == 'k' ) {
+ memory_end = memory_end << 10;
+ from++;
+ } else if ( *from == 'M' || *from == 'm' ) {
+ memory_end = memory_end << 20;
+ from++;
+ }
+ }
+ /*
+ * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
+ */
+ if (c == ' ' && strncmp(from, "ipldelay=", 9) == 0) {
+ delay = simple_strtoul(from+9, &from, 0);
if (*from == 's' || *from == 'S') {
delay = delay*1000000;
from++;
@@ -403,24 +370,110 @@ void __init setup_arch(char **cmdline_p)
}
/* now wait for the requested amount of time */
udelay(delay);
- }
- cn = *(from++);
- if (!cn)
- break;
- if (cn == '\n')
- cn = ' '; /* replace newlines with space */
+ }
+ cn = *(from++);
+ if (!cn)
+ break;
+ if (cn == '\n')
+ cn = ' '; /* replace newlines with space */
if (cn == 0x0d)
cn = ' '; /* replace 0x0d with space */
- if (cn == ' ' && c == ' ')
- continue; /* remove additional spaces */
- c = cn;
- if (to - command_line >= COMMAND_LINE_SIZE)
- break;
- *(to++) = c;
- }
- if (c == ' ' && to > command_line) to--;
- *to = '\0';
- *cmdline_p = command_line;
+ if (cn == ' ' && c == ' ')
+ continue; /* remove additional spaces */
+ c = cn;
+ if (to - command_line >= COMMAND_LINE_SIZE)
+ break;
+ *(to++) = c;
+ }
+ if (c == ' ' && to > command_line) to--;
+ *to = '\0';
+ *cmdline_p = command_line;
+}
+
+static void __init
+setup_lowcore(void)
+{
+ struct _lowcore *lc;
+ int lc_pages;
+
+ /*
+ * Setup lowcore for boot cpu
+ */
+ lc_pages = sizeof(void *) == 8 ? 2 : 1;
+ lc = (struct _lowcore *)
+ __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
+ memset(lc, 0, lc_pages * PAGE_SIZE);
+ lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
+ lc->restart_psw.addr =
+ PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
+ lc->external_new_psw.mask = PSW_KERNEL_BITS;
+ lc->external_new_psw.addr =
+ PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
+ lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
+ lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
+ lc->program_new_psw.mask = PSW_KERNEL_BITS;
+ lc->program_new_psw.addr =
+ PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
+ lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
+ lc->mcck_new_psw.addr =
+ PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
+ lc->io_new_psw.mask = PSW_KERNEL_BITS;
+ lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
+ lc->ipl_device = S390_lowcore.ipl_device;
+ lc->jiffy_timer = -1LL;
+ lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
+ lc->async_stack = (unsigned long)
+ __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
+#ifdef CONFIG_CHECK_STACK
+ lc->panic_stack = (unsigned long)
+ __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
+#endif
+ lc->current_task = (unsigned long) init_thread_union.thread_info.task;
+ lc->thread_info = (unsigned long) &init_thread_union;
+#ifdef CONFIG_ARCH_S390X
+ if (MACHINE_HAS_DIAG44)
+ lc->diag44_opcode = 0x83000044;
+ else
+ lc->diag44_opcode = 0x07000700;
+#endif /* CONFIG_ARCH_S390X */
+ set_prefix((u32)(unsigned long) lc);
+}
+
+static void __init
+setup_resources(void)
+{
+ struct resource *res;
+ int i;
+
+ for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
+ res = alloc_bootmem_low(sizeof(struct resource));
+ res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
+ switch (memory_chunk[i].type) {
+ case CHUNK_READ_WRITE:
+ res->name = "System RAM";
+ break;
+ case CHUNK_READ_ONLY:
+ res->name = "System ROM";
+ res->flags |= IORESOURCE_READONLY;
+ break;
+ default:
+ res->name = "reserved";
+ }
+ res->start = memory_chunk[i].addr;
+ res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
+ request_resource(&iomem_resource, res);
+ request_resource(res, &code_resource);
+ request_resource(res, &data_resource);
+ }
+}
+
+static void __init
+setup_memory(void)
+{
+ unsigned long bootmap_size;
+ unsigned long start_pfn, end_pfn, init_pfn;
+ unsigned long last_rw_end;
+ int i;
/*
* partially used pages are not usable - thus
@@ -429,6 +482,10 @@ void __init setup_arch(char **cmdline_p)
start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT;
end_pfn = max_pfn = memory_end >> PAGE_SHIFT;
+ /* Initialize storage key for kernel pages */
+ for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
+ page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
+
/*
* Initialize the boot-time allocator (with low memory only):
*/
@@ -437,7 +494,9 @@ void __init setup_arch(char **cmdline_p)
/*
* Register RAM areas with the bootmem allocator.
*/
- for (i = 0; i < 16 && memory_chunk[i].size > 0; i++) {
+ last_rw_end = start_pfn;
+
+ for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
unsigned long start_chunk, end_chunk;
if (memory_chunk[i].type != CHUNK_READ_WRITE)
@@ -450,102 +509,98 @@ void __init setup_arch(char **cmdline_p)
start_chunk = start_pfn;
if (end_chunk > end_pfn)
end_chunk = end_pfn;
- if (start_chunk < end_chunk)
+ if (start_chunk < end_chunk) {
+ /* Initialize storage key for RAM pages */
+ for (init_pfn = start_chunk ; init_pfn < end_chunk;
+ init_pfn++)
+ page_set_storage_key(init_pfn << PAGE_SHIFT,
+ PAGE_DEFAULT_KEY);
free_bootmem(start_chunk << PAGE_SHIFT,
(end_chunk - start_chunk) << PAGE_SHIFT);
+ if (last_rw_end < start_chunk)
+ add_memory_hole(last_rw_end, start_chunk - 1);
+ last_rw_end = end_chunk;
+ }
}
- /*
- * Reserve the bootmem bitmap itself as well. We do this in two
- * steps (first step was init_bootmem()) because this catches
- * the (very unlikely) case of us accidentally initializing the
- * bootmem allocator with an invalid RAM area.
- */
- reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
+ psw_set_key(PAGE_DEFAULT_KEY);
+
+ if (last_rw_end < end_pfn - 1)
+ add_memory_hole(last_rw_end, end_pfn - 1);
+
+ /*
+ * Reserve the bootmem bitmap itself as well. We do this in two
+ * steps (first step was init_bootmem()) because this catches
+ * the (very unlikely) case of us accidentally initializing the
+ * bootmem allocator with an invalid RAM area.
+ */
+ reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
#ifdef CONFIG_BLK_DEV_INITRD
- if (INITRD_START) {
+ if (INITRD_START) {
if (INITRD_START + INITRD_SIZE <= memory_end) {
reserve_bootmem(INITRD_START, INITRD_SIZE);
initrd_start = INITRD_START;
initrd_end = initrd_start + INITRD_SIZE;
} else {
- printk("initrd extends beyond end of memory "
- "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
- initrd_start + INITRD_SIZE, memory_end);
- initrd_start = initrd_end = 0;
+ printk("initrd extends beyond end of memory "
+ "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
+ initrd_start + INITRD_SIZE, memory_end);
+ initrd_start = initrd_end = 0;
}
- }
+ }
#endif
+}
- for (i = 0; i < 16 && memory_chunk[i].size > 0; i++) {
- struct resource *res;
-
- res = alloc_bootmem_low(sizeof(struct resource));
- res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
-
- switch (memory_chunk[i].type) {
- case CHUNK_READ_WRITE:
- res->name = "System RAM";
- break;
- case CHUNK_READ_ONLY:
- res->name = "System ROM";
- res->flags |= IORESOURCE_READONLY;
- break;
- default:
- res->name = "reserved";
- }
- res->start = memory_chunk[i].addr;
- res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
- request_resource(&iomem_resource, res);
- request_resource(res, &code_resource);
- request_resource(res, &data_resource);
- }
+/*
+ * Setup function called from init/main.c just after the banner
+ * was printed.
+ */
+void __init
+setup_arch(char **cmdline_p)
+{
/*
- * Setup lowcore for boot cpu
+ * print what head.S has found out about the machine
*/
#ifndef CONFIG_ARCH_S390X
- lc = (struct _lowcore *) __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
- memset(lc, 0, PAGE_SIZE);
+ printk((MACHINE_IS_VM) ?
+ "We are running under VM (31 bit mode)\n" :
+ "We are running native (31 bit mode)\n");
+ printk((MACHINE_HAS_IEEE) ?
+ "This machine has an IEEE fpu\n" :
+ "This machine has no IEEE fpu\n");
#else /* CONFIG_ARCH_S390X */
- lc = (struct _lowcore *) __alloc_bootmem(2*PAGE_SIZE, 2*PAGE_SIZE, 0);
- memset(lc, 0, 2*PAGE_SIZE);
+ printk((MACHINE_IS_VM) ?
+ "We are running under VM (64 bit mode)\n" :
+ "We are running native (64 bit mode)\n");
#endif /* CONFIG_ARCH_S390X */
- lc->restart_psw.mask = PSW_BASE_BITS;
- lc->restart_psw.addr =
- PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
- lc->external_new_psw.mask = PSW_KERNEL_BITS;
- lc->external_new_psw.addr =
- PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
- lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
- lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
- lc->program_new_psw.mask = PSW_KERNEL_BITS;
- lc->program_new_psw.addr =
- PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
- lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
- lc->mcck_new_psw.addr =
- PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
- lc->io_new_psw.mask = PSW_KERNEL_BITS;
- lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
- lc->ipl_device = S390_lowcore.ipl_device;
- lc->jiffy_timer = -1LL;
- lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
- lc->async_stack = (unsigned long)
- __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
-#ifdef CONFIG_CHECK_STACK
- lc->panic_stack = (unsigned long)
- __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
-#endif
- lc->current_task = (unsigned long) init_thread_union.thread_info.task;
- lc->thread_info = (unsigned long) &init_thread_union;
-#ifdef CONFIG_ARCH_S390X
- if (MACHINE_HAS_DIAG44)
- lc->diag44_opcode = 0x83000044;
- else
- lc->diag44_opcode = 0x07000700;
+
+ ROOT_DEV = Root_RAM0;
+#ifndef CONFIG_ARCH_S390X
+ memory_end = memory_size & ~0x400000UL; /* align memory end to 4MB */
+ /*
+ * We need some free virtual space to be able to do vmalloc.
+ * On a machine with 2GB memory we make sure that we have at
+ * least 128 MB free space for vmalloc.
+ */
+ if (memory_end > 1920*1024*1024)
+ memory_end = 1920*1024*1024;
+#else /* CONFIG_ARCH_S390X */
+ memory_end = memory_size & ~0x200000UL; /* detected in head.s */
#endif /* CONFIG_ARCH_S390X */
- set_prefix((u32)(unsigned long) lc);
+
+ init_mm.start_code = PAGE_OFFSET;
+ init_mm.end_code = (unsigned long) &_etext;
+ init_mm.end_data = (unsigned long) &_edata;
+ init_mm.brk = (unsigned long) &_end;
+
+ parse_cmdline_early(cmdline_p);
+
+ setup_memory();
+ setup_resources();
+ setup_lowcore();
+
cpu_init();
__cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index 061e81138dc..8ca48567678 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -244,7 +244,7 @@ int sysctl_hz_timer = 1;
*/
static inline void stop_hz_timer(void)
{
- __u64 timer;
+ __u64 timer, todval;
if (sysctl_hz_timer != 0)
return;
@@ -265,8 +265,14 @@ static inline void stop_hz_timer(void)
* for the next event.
*/
timer = (__u64) (next_timer_interrupt() - jiffies) + jiffies_64;
- timer = jiffies_timer_cc + timer * CLK_TICKS_PER_JIFFY;
- asm volatile ("SCKC %0" : : "m" (timer));
+ todval = -1ULL;
+ /* Be careful about overflows. */
+ if (timer < (-1ULL / CLK_TICKS_PER_JIFFY)) {
+ timer = jiffies_timer_cc + timer * CLK_TICKS_PER_JIFFY;
+ if (timer >= jiffies_timer_cc)
+ todval = timer;
+ }
+ asm volatile ("SCKC %0" : : "m" (todval));
}
/*
diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
index bb6cf02418a..fa0726507b3 100644
--- a/arch/s390/kernel/vtime.c
+++ b/arch/s390/kernel/vtime.c
@@ -122,12 +122,17 @@ static void start_cpu_timer(void)
struct vtimer_queue *vt_list;
vt_list = &per_cpu(virt_cpu_timer, smp_processor_id());
- set_vtimer(vt_list->idle);
+
+ /* CPU timer interrupt is pending, don't reprogramm it */
+ if (vt_list->idle & 1LL<<63)
+ return;
+
+ if (!list_empty(&vt_list->list))
+ set_vtimer(vt_list->idle);
}
static void stop_cpu_timer(void)
{
- __u64 done;
struct vtimer_queue *vt_list;
vt_list = &per_cpu(virt_cpu_timer, smp_processor_id());
@@ -138,21 +143,17 @@ static void stop_cpu_timer(void)
goto fire;
}
- /* store progress */
- asm volatile ("STPT %0" : "=m" (done));
+ /* store the actual expire value */
+ asm volatile ("STPT %0" : "=m" (vt_list->idle));
/*
- * If done is negative we do not stop the CPU timer
- * because we will get instantly an interrupt that
- * will start the CPU timer again.
+ * If the CPU timer is negative we don't reprogramm
+ * it because we will get instantly an interrupt.
*/
- if (done & 1LL<<63)
+ if (vt_list->idle & 1LL<<63)
return;
- else
- vt_list->offset += vt_list->to_expire - done;
- /* save the actual expire value */
- vt_list->idle = done;
+ vt_list->offset += vt_list->to_expire - vt_list->idle;
/*
* We cannot halt the CPU timer, we just write a value that
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-16 23:46:53 +0000