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Subject[PATCH] make jiffies wrap 5 min after boot
> | There is a better solution to ensure correct jiffy wrap handling in
> | *ALL* kernel code: make jiffy wrap in first five minutes of uptime.
> | Tim has a patch for such config option. This is almost right.
> | This MUST NOT be a config option, it MUST be mandatory in every
> | kernel. Driver writers would be bitten by their own bugs and will
> | fix it themself. Tim, what do you think?
>
> I like it too. We should take advantage of easy-to-force/find/fix
> problems like this.


Ok, I've forward-ported the patch to 2.5. Since 2.5 isn't supposed to be
stable anyways, I made it unconditional.
Note that it is completely transparent to the user.

Tim


--- linux-2.5.61/include/linux/time.h Sat Feb 15 11:53:48 2003
+++ linux-2.5.61-jdbg/include/linux/time.h Sun Feb 16 01:42:26 2003
@@ -28,6 +28,12 @@
#include <linux/seqlock.h>

/*
+ * Have the 32 bit jiffies value wrap 5 minutes after boot
+ * so jiffies wrap bugs show up earlier.
+ */
+#define INITIAL_JIFFIES (0xffffffffUL & (unsigned long)(-300*HZ))
+
+/*
* Change timeval to jiffies, trying to avoid the
* most obvious overflows..
*
--- linux-2.5.61/kernel/timer.c Sat Feb 15 11:53:49 2003
+++ linux-2.5.61-jdbg/kernel/timer.c Sun Feb 16 02:05:38 2003
@@ -755,7 +755,7 @@
}

/* jiffies at the most recent update of wall time */
-unsigned long wall_jiffies;
+unsigned long wall_jiffies = INITIAL_JIFFIES;

/*
* This read-write spinlock protects us from races in SMP while
@@ -1098,7 +1098,7 @@
do {
seq = read_seqbegin(&xtime_lock);

- uptime = jiffies_64;
+ uptime = jiffies_64 - INITIAL_JIFFIES;
do_div(uptime, HZ);
val.uptime = (unsigned long) uptime;

@@ -1174,6 +1174,13 @@
}
for (j = 0; j < TVR_SIZE; j++)
INIT_LIST_HEAD(base->tv1.vec + j);
+
+ base->timer_jiffies = INITIAL_JIFFIES;
+ base->tv1.index = INITIAL_JIFFIES & TVR_MASK;
+ base->tv2.index = (INITIAL_JIFFIES >> TVR_BITS) & TVN_MASK;
+ base->tv3.index = (INITIAL_JIFFIES >> (TVR_BITS+TVN_BITS)) & TVN_MASK;
+ base->tv4.index = (INITIAL_JIFFIES >> (TVR_BITS+2*TVN_BITS)) & TVN_MASK;
+ base->tv5.index = (INITIAL_JIFFIES >> (TVR_BITS+3*TVN_BITS)) & TVN_MASK;
}

static int __devinit timer_cpu_notify(struct notifier_block *self,
--- linux-2.5.61/fs/proc/array.c Sat Feb 15 11:54:54 2003
+++ linux-2.5.61-jdbg/fs/proc/array.c Sun Feb 16 01:58:26 2003
@@ -327,7 +327,8 @@
nice,
0UL /* removed */,
jiffies_to_clock_t(task->it_real_value),
- (unsigned long long) jiffies_64_to_clock_t(task->start_time),
+ (unsigned long long)
+ jiffies_64_to_clock_t(task->start_time - INITIAL_JIFFIES),
vsize,
mm ? mm->rss : 0, /* you might want to shift this left 3 */
task->rlim[RLIMIT_RSS].rlim_cur,
--- linux-2.5.61/fs/proc/proc_misc.c Sat Feb 15 11:53:47 2003
+++ linux-2.5.61-jdbg/fs/proc/proc_misc.c Sun Feb 16 02:01:17 2003
@@ -104,7 +104,7 @@
unsigned long uptime_remainder;
int len;

- uptime = get_jiffies_64();
+ uptime = get_jiffies_64() - INITIAL_JIFFIES;
uptime_remainder = (unsigned long) do_div(uptime, HZ);

#if HZ!=100
@@ -320,7 +320,7 @@
{
int i, len;
extern unsigned long total_forks;
- u64 jif = get_jiffies_64();
+ u64 jif = get_jiffies_64() - INITIAL_JIFFIES;
unsigned int sum = 0, user = 0, nice = 0, system = 0, idle = 0, iowait = 0;

for (i = 0 ; i < NR_CPUS; i++) {
--- linux-2.5.61/arch/alpha/kernel/time.c Sat Feb 15 11:53:34 2003
+++ linux-2.5.61-jdbg/arch/alpha/kernel/time.c Sun Feb 16 01:42:26 2003
@@ -50,7 +50,7 @@
#include "proto.h"
#include "irq_impl.h"

-u64 jiffies_64;
+u64 jiffies_64 = INITIAL_JIFFIES;

extern unsigned long wall_jiffies; /* kernel/timer.c */

--- linux-2.5.61/arch/arm/kernel/time.c Sat Feb 15 11:53:34 2003
+++ linux-2.5.61-jdbg/arch/arm/kernel/time.c Sun Feb 16 01:42:26 2003
@@ -32,7 +32,7 @@
#include <asm/irq.h>
#include <asm/leds.h>

-u64 jiffies_64;
+u64 jiffies_64 = INITIAL_JIFFIES;

extern unsigned long wall_jiffies;

--- linux-2.5.61/arch/cris/kernel/time.c Fri Jan 17 03:22:16 2003
+++ linux-2.5.61-jdbg/arch/cris/kernel/time.c Sun Feb 16 01:42:26 2003
@@ -45,7 +45,7 @@

#include <asm/svinto.h>

-u64 jiffies_64;
+u64 jiffies_64 = INITIAL_JIFFIES;

static int have_rtc; /* used to remember if we have an RTC or not */

--- linux-2.5.61/arch/i386/kernel/time.c Sat Feb 15 11:53:34 2003
+++ linux-2.5.61-jdbg/arch/i386/kernel/time.c Sun Feb 16 01:42:26 2003
@@ -66,7 +66,7 @@

#include "do_timer.h"

-u64 jiffies_64;
+u64 jiffies_64 = INITIAL_JIFFIES;

unsigned long cpu_khz; /* Detected as we calibrate the TSC */

--- linux-2.5.61/arch/ia64/kernel/time.c Sat Feb 15 11:53:35 2003
+++ linux-2.5.61-jdbg/arch/ia64/kernel/time.c Sun Feb 16 01:42:26 2003
@@ -27,7 +27,7 @@
extern unsigned long wall_jiffies;
extern unsigned long last_time_offset;

-u64 jiffies_64;
+u64 jiffies_64 = INITIAL_JIFFIES;

#ifdef CONFIG_IA64_DEBUG_IRQ

--- linux-2.5.61/arch/m68k/kernel/time.c Sat Feb 15 11:53:35 2003
+++ linux-2.5.61-jdbg/arch/m68k/kernel/time.c Sun Feb 16 01:42:26 2003
@@ -26,7 +26,7 @@
#include <linux/timex.h>
#include <linux/profile.h>

-u64 jiffies_64;
+u64 jiffies_64 = INITIAL_JIFFIES;

static inline int set_rtc_mmss(unsigned long nowtime)
{
--- linux-2.5.61/arch/m68knommu/kernel/time.c Sat Feb 15 11:53:35 2003
+++ linux-2.5.61-jdbg/arch/m68knommu/kernel/time.c Sun Feb 16 01:42:26 2003
@@ -26,7 +26,7 @@

#define TICK_SIZE (tick_nsec / 1000)

-u64 jiffies_64;
+u64 jiffies_64 = INITIAL_JIFFIES;

static inline int set_rtc_mmss(unsigned long nowtime)
{
--- linux-2.5.61/arch/mips/kernel/time.c Sat Feb 15 11:53:35 2003
+++ linux-2.5.61-jdbg/arch/mips/kernel/time.c Sun Feb 16 01:42:26 2003
@@ -32,7 +32,7 @@
#define USECS_PER_JIFFY (1000000/HZ)
#define USECS_PER_JIFFY_FRAC ((1000000ULL << 32) / HZ & 0xffffffff)

-u64 jiffies_64;
+u64 jiffies_64 = INITIAL_JIFFIES;

/*
* forward reference
--- linux-2.5.61/arch/parisc/kernel/time.c Sat Feb 15 11:53:35 2003
+++ linux-2.5.61-jdbg/arch/parisc/kernel/time.c Sun Feb 16 01:42:26 2003
@@ -32,7 +32,7 @@

#include <linux/timex.h>

-u64 jiffies_64;
+u64 jiffies_64 = INITIAL_JIFFIES;

/* xtime and wall_jiffies keep wall-clock time */
extern unsigned long wall_jiffies;
--- linux-2.5.61/arch/ppc/kernel/time.c Sat Feb 15 11:53:35 2003
+++ linux-2.5.61-jdbg/arch/ppc/kernel/time.c Sun Feb 16 01:42:26 2003
@@ -68,7 +68,7 @@
#include <asm/time.h>

/* XXX false sharing with below? */
-u64 jiffies_64;
+u64 jiffies_64 = INITIAL_JIFFIES;

unsigned long disarm_decr[NR_CPUS];

--- linux-2.5.61/arch/ppc64/kernel/time.c Sat Feb 15 11:53:36 2003
+++ linux-2.5.61-jdbg/arch/ppc64/kernel/time.c Sun Feb 16 01:42:26 2003
@@ -65,7 +65,7 @@

void smp_local_timer_interrupt(struct pt_regs *);

-u64 jiffies_64;
+u64 jiffies_64 = INITIAL_JIFFIES;

/* keep track of when we need to update the rtc */
time_t last_rtc_update;
--- linux-2.5.61/arch/s390/kernel/time.c Sat Feb 15 11:53:36 2003
+++ linux-2.5.61-jdbg/arch/s390/kernel/time.c Sun Feb 16 01:42:26 2003
@@ -46,7 +46,7 @@

#define TICK_SIZE tick

-u64 jiffies_64;
+u64 jiffies_64 = INITIAL_JIFFIES;

static ext_int_info_t ext_int_info_timer;
static uint64_t xtime_cc;
--- linux-2.5.61/arch/s390x/kernel/time.c Sat Feb 15 11:53:36 2003
+++ linux-2.5.61-jdbg/arch/s390x/kernel/time.c Sun Feb 16 01:42:26 2003
@@ -45,7 +45,7 @@

#define TICK_SIZE tick

-u64 jiffies_64;
+u64 jiffies_64 = INITIAL_JIFFIES;

static ext_int_info_t ext_int_info_timer;
static uint64_t xtime_cc;
--- linux-2.5.61/arch/sh/kernel/time.c Sat Feb 15 11:53:36 2003
+++ linux-2.5.61-jdbg/arch/sh/kernel/time.c Sun Feb 16 01:42:26 2003
@@ -70,7 +70,7 @@
#endif /* CONFIG_CPU_SUBTYPE_ST40STB1 */
#endif /* __sh3__ or __SH4__ */

-u64 jiffies_64;
+u64 jiffies_64 = INITIAL_JIFFIES;

extern unsigned long wall_jiffies;
#define TICK_SIZE tick
--- linux-2.5.61/arch/sparc/kernel/time.c Sat Feb 15 11:53:36 2003
+++ linux-2.5.61-jdbg/arch/sparc/kernel/time.c Sun Feb 16 01:42:26 2003
@@ -45,7 +45,7 @@

extern unsigned long wall_jiffies;

-u64 jiffies_64;
+u64 jiffies_64 = INITIAL_JIFFIES;

enum sparc_clock_type sp_clock_typ;
spinlock_t mostek_lock = SPIN_LOCK_UNLOCKED;
--- linux-2.5.61/arch/sparc64/kernel/time.c Sat Feb 15 11:53:36 2003
+++ linux-2.5.61-jdbg/arch/sparc64/kernel/time.c Sun Feb 16 01:42:26 2003
@@ -47,7 +47,7 @@

extern unsigned long wall_jiffies;

-u64 jiffies_64;
+u64 jiffies_64 = INITIAL_JIFFIES;

static unsigned long mstk48t08_regs = 0UL;
static unsigned long mstk48t59_regs = 0UL;
--- linux-2.5.61/arch/v850/kernel/time.c Sat Feb 15 11:53:37 2003
+++ linux-2.5.61-jdbg/arch/v850/kernel/time.c Sun Feb 16 01:42:26 2003
@@ -25,7 +25,7 @@

#include "mach.h"

-u64 jiffies_64;
+u64 jiffies_64 = INITIAL_JIFFIES;

#define TICK_SIZE (tick_nsec / 1000)

--- linux-2.5.61/arch/x86_64/kernel/time.c Sat Feb 15 11:54:51 2003
+++ linux-2.5.61-jdbg/arch/x86_64/kernel/time.c Sun Feb 16 01:42:26 2003
@@ -30,7 +30,7 @@
#include <asm/apic.h>
#endif

-u64 jiffies_64;
+u64 jiffies_64 = INITIAL_JIFFIES;

extern int using_apic_timer;


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