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Subject[PATCH] New, shiny per-cpu macros...
Date
This should keep everyone happy.  David, I touched ia64 the most, can
you check it still compiles?

Jamie, you found the last bug, so I'd appreciate your eyes as well.

Name: get_cpu_var patch
Author: Rusty Russell
Status: Cleanup

D: This makes introduces get_cpu_var() which gets a per-cpu variable
D: and disables preemption, and renames the (unsafe under preemption)
D: "this_cpu()" macro to __get_cpu_var(). It also deletes the
D: redundant definitions in linux/smp.h.

diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.25/include/linux/percpu.h working-2.5.25-getcpu/include/linux/percpu.h
--- linux-2.5.25/include/linux/percpu.h Mon Jun 24 00:53:24 2002
+++ working-2.5.25-getcpu/include/linux/percpu.h Thu Jul 11 13:32:30 2002
@@ -8,7 +8,9 @@
#else
#define __per_cpu_data
#define per_cpu(var, cpu) var
-#define this_cpu(var) var
+#define __get_cpu_var(var) var
#endif

+#define get_cpu_var(var) ({ preempt_disable(); __get_cpu_var(var); })
+#define put_cpu_var(var) preempt_enable()
#endif /* __LINUX_PERCPU_H */
diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.25/include/linux/smp.h working-2.5.25-getcpu/include/linux/smp.h
--- linux-2.5.25/include/linux/smp.h Fri Jun 21 09:41:55 2002
+++ working-2.5.25-getcpu/include/linux/smp.h Thu Jul 11 13:32:07 2002
@@ -89,10 +89,6 @@
#define cpu_online_map 1
#define cpu_online(cpu) 1
#define num_online_cpus() 1
-#define __per_cpu_data
-#define per_cpu(var, cpu) var
-#define this_cpu(var) var
-
#endif /* !SMP */

#define get_cpu() ({ preempt_disable(); smp_processor_id(); })
diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.25/include/asm-ia64/percpu.h working-2.5.25-getcpu/include/asm-ia64/percpu.h
--- linux-2.5.25/include/asm-ia64/percpu.h Tue Apr 23 11:39:38 2002
+++ working-2.5.25-getcpu/include/asm-ia64/percpu.h Thu Jul 11 13:34:05 2002
@@ -17,7 +17,7 @@
extern unsigned long __per_cpu_offset[NR_CPUS];

#define per_cpu(var, cpu) (*(__typeof__(&(var))) ((void *) &(var) + __per_cpu_offset[cpu]))
-#define this_cpu(var) (var)
+#define __get_cpu_var(var) (var)

#endif /* !__ASSEMBLY__ */

diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.25/include/asm-ia64/processor.h working-2.5.25-getcpu/include/asm-ia64/processor.h
--- linux-2.5.25/include/asm-ia64/processor.h Fri Jun 21 09:41:55 2002
+++ working-2.5.25-getcpu/include/asm-ia64/processor.h Thu Jul 11 13:33:26 2002
@@ -181,7 +181,7 @@
* The "local" data pointer. It points to the per-CPU data of the currently executing
* CPU, much like "current" points to the per-task data of the currently executing task.
*/
-#define local_cpu_data (&this_cpu(cpu_info))
+#define local_cpu_data (&__get_cpu_var(cpu_info))
#define cpu_data(cpu) (&per_cpu(cpu_info, cpu))

extern void identify_cpu (struct cpuinfo_ia64 *);
diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.25/include/asm-x86_64/percpu.h working-2.5.25-getcpu/include/asm-x86_64/percpu.h
--- linux-2.5.25/include/asm-x86_64/percpu.h Mon Jun 17 23:19:25 2002
+++ working-2.5.25-getcpu/include/asm-x86_64/percpu.h Thu Jul 11 13:34:17 2002
@@ -4,7 +4,7 @@
#include <asm/pda.h>

/* var is in discarded region: offset to particular copy we want */
-#define this_cpu(var) (*RELOC_HIDE(&var, read_pda(cpudata_offset)))
+#define __get_cpu_var(var) (*RELOC_HIDE(&var, read_pda(cpudata_offset)))
#define per_cpu(var, cpu) (*RELOC_HIDE(&var, per_cpu_pda[cpu]))

void setup_per_cpu_areas(void);
diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.25/arch/ia64/kernel/perfmon.c working-2.5.25-getcpu/arch/ia64/kernel/perfmon.c
--- linux-2.5.25/arch/ia64/kernel/perfmon.c Thu Jun 20 01:28:47 2002
+++ working-2.5.25-getcpu/arch/ia64/kernel/perfmon.c Thu Jul 11 13:35:08 2002
@@ -1762,7 +1762,7 @@
ia64_srlz_i();

#ifdef CONFIG_SMP
- this_cpu(pfm_dcr_pp) = 0;
+ __get_cpu_var(pfm_dcr_pp) = 0;
#else
pfm_tasklist_toggle_pp(0);
#endif
@@ -2163,7 +2163,7 @@
if (ctx->ctx_fl_system) {

#ifdef CONFIG_SMP
- this_cpu(pfm_dcr_pp) = 1;
+ __get_cpu_var(pfm_dcr_pp) = 1;
#else
pfm_tasklist_toggle_pp(1);
#endif
@@ -2218,8 +2218,8 @@
ia64_srlz_i();

#ifdef CONFIG_SMP
- this_cpu(pfm_syst_wide) = 1;
- this_cpu(pfm_dcr_pp) = 0;
+ __get_cpu_var(pfm_syst_wide) = 1;
+ __get_cpu_var(pfm_dcr_pp) = 0;
#endif
} else {
/*
@@ -2973,9 +2973,9 @@
p += sprintf(p, "CPU%d syst_wide : %d\n"
"CPU%d dcr_pp : %d\n",
smp_processor_id(),
- this_cpu(pfm_syst_wide),
+ __get_cpu_var(pfm_syst_wide),
smp_processor_id(),
- this_cpu(pfm_dcr_pp));
+ __get_cpu_var(pfm_dcr_pp));
#endif

LOCK_PFS();
@@ -3045,7 +3045,7 @@
/*
* propagate the value of the dcr_pp bit to the psr
*/
- ia64_psr(regs)->pp = mode ? this_cpu(pfm_dcr_pp) : 0;
+ ia64_psr(regs)->pp = mode ? __get_cpu_var(pfm_dcr_pp) : 0;
}
#endif

@@ -3539,8 +3539,8 @@
ia64_srlz_i();

#ifdef CONFIG_SMP
- this_cpu(pfm_syst_wide) = 0;
- this_cpu(pfm_dcr_pp) = 0;
+ __get_cpu_var(pfm_syst_wide) = 0;
+ __get_cpu_var(pfm_dcr_pp) = 0;
#else
pfm_tasklist_toggle_pp(0);
#endif
diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.25/arch/ia64/kernel/process.c working-2.5.25-getcpu/arch/ia64/kernel/process.c
--- linux-2.5.25/arch/ia64/kernel/process.c Thu May 30 10:00:47 2002
+++ working-2.5.25-getcpu/arch/ia64/kernel/process.c Thu Jul 11 13:35:21 2002
@@ -194,7 +194,7 @@
pfm_save_regs(task);

# ifdef CONFIG_SMP
- if (this_cpu(pfm_syst_wide))
+ if (__get_cpu_var(pfm_syst_wide))
pfm_syst_wide_update_task(task, 0);
# endif
#endif
@@ -216,7 +216,7 @@
pfm_load_regs(task);

# ifdef CONFIG_SMP
- if (this_cpu(pfm_syst_wide)) pfm_syst_wide_update_task(task, 1);
+ if (__get_cpu_var(pfm_syst_wide)) pfm_syst_wide_update_task(task, 1);
# endif
#endif

diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.25/arch/ia64/kernel/smp.c working-2.5.25-getcpu/arch/ia64/kernel/smp.c
--- linux-2.5.25/arch/ia64/kernel/smp.c Thu Jun 20 01:28:47 2002
+++ working-2.5.25-getcpu/arch/ia64/kernel/smp.c Thu Jul 11 13:35:39 2002
@@ -99,7 +99,7 @@
handle_IPI (int irq, void *dev_id, struct pt_regs *regs)
{
int this_cpu = smp_processor_id();
- unsigned long *pending_ipis = &this_cpu(ipi_operation);
+ unsigned long *pending_ipis = &__get_cpu_var(ipi_operation);
unsigned long ops;

/* Count this now; we may make a call that never returns. */
diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.25/include/asm-generic/percpu.h working-2.5.25-getcpu/include/asm-generic/percpu.h
--- linux-2.5.25/include/asm-generic/percpu.h Mon Apr 15 11:47:44 2002
+++ working-2.5.25-getcpu/include/asm-generic/percpu.h Thu Jul 11 13:32:42 2002
@@ -8,6 +8,6 @@

/* var is in discarded region: offset to particular copy we want */
#define per_cpu(var, cpu) (*RELOC_HIDE(&var, __per_cpu_offset[cpu]))
-#define this_cpu(var) per_cpu(var, smp_processor_id())
+#define __get_cpu_var(var) per_cpu(var, smp_processor_id())

#endif /* _ASM_GENERIC_PERCPU_H_ */
diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.25/kernel/softirq.c working-2.5.25-getcpu/kernel/softirq.c
--- linux-2.5.25/kernel/softirq.c Sun Jul 7 02:12:24 2002
+++ working-2.5.25-getcpu/kernel/softirq.c Thu Jul 11 13:31:26 2002
@@ -162,8 +162,8 @@
unsigned long flags;

local_irq_save(flags);
- t->next = this_cpu(tasklet_vec).list;
- this_cpu(tasklet_vec).list = t;
+ t->next = __get_cpu_var(tasklet_vec).list;
+ __get_cpu_var(tasklet_vec).list = t;
cpu_raise_softirq(smp_processor_id(), TASKLET_SOFTIRQ);
local_irq_restore(flags);
}
@@ -173,8 +173,8 @@
unsigned long flags;

local_irq_save(flags);
- t->next = this_cpu(tasklet_hi_vec).list;
- this_cpu(tasklet_hi_vec).list = t;
+ t->next = __get_cpu_var(tasklet_hi_vec).list;
+ __get_cpu_var(tasklet_hi_vec).list = t;
cpu_raise_softirq(smp_processor_id(), HI_SOFTIRQ);
local_irq_restore(flags);
}
@@ -184,8 +184,8 @@
struct tasklet_struct *list;

local_irq_disable();
- list = this_cpu(tasklet_vec).list;
- this_cpu(tasklet_vec).list = NULL;
+ list = __get_cpu_var(tasklet_vec).list;
+ __get_cpu_var(tasklet_vec).list = NULL;
local_irq_enable();

while (list) {
@@ -205,8 +205,8 @@
}

local_irq_disable();
- t->next = this_cpu(tasklet_vec).list;
- this_cpu(tasklet_vec).list = t;
+ t->next = __get_cpu_var(tasklet_vec).list;
+ __get_cpu_var(tasklet_vec).list = t;
__cpu_raise_softirq(smp_processor_id(), TASKLET_SOFTIRQ);
local_irq_enable();
}
@@ -217,8 +217,8 @@
struct tasklet_struct *list;

local_irq_disable();
- list = this_cpu(tasklet_hi_vec).list;
- this_cpu(tasklet_hi_vec).list = NULL;
+ list = __get_cpu_var(tasklet_hi_vec).list;
+ __get_cpu_var(tasklet_hi_vec).list = NULL;
local_irq_enable();

while (list) {
@@ -238,8 +238,8 @@
}

local_irq_disable();
- t->next = this_cpu(tasklet_hi_vec).list;
- this_cpu(tasklet_hi_vec).list = t;
+ t->next = __get_cpu_var(tasklet_hi_vec).list;
+ __get_cpu_var(tasklet_hi_vec).list = t;
__cpu_raise_softirq(smp_processor_id(), HI_SOFTIRQ);
local_irq_enable();
}
Name: Export __per_cpu_offset so modules can use per-cpu data.
Author: Rusty Russell
Status: Trivial

D: As per Andrew Morton's request.

diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.25/kernel/ksyms.c working-2.5.25-percpu/kernel/ksyms.c
--- linux-2.5.25/kernel/ksyms.c Sun Jul 7 02:12:24 2002
+++ working-2.5.25-percpu/kernel/ksyms.c Fri Jul 12 16:03:47 2002
@@ -50,6 +50,7 @@
#include <linux/namei.h>
#include <linux/buffer_head.h>
#include <linux/root_dev.h>
+#include <linux/percpu.h>
#include <asm/checksum.h>

#if defined(CONFIG_PROC_FS)
@@ -597,3 +598,6 @@

EXPORT_SYMBOL(tasklist_lock);
EXPORT_SYMBOL(pidhash);
+#if defined(CONFIG_SMP) && defined(__GENERIC_PER_CPU)
+EXPORT_SYMBOL(__per_cpu_offset);
+#endif
Name: DECLARE_PER_CPU/DEFINE_PER_CPU patch
Author: Rusty Russell
Status: Cleanup
Depends: Misc/get-percpu.patch.gz Misc/percpu-export.patch.gz

D: This old __per_cpu_data define wasn't enough if an arch wants to
D: use the gcc __thread prefix (thread local storage), which needs to
D: go *before* the type in the definition. So we have to go for a
D: DECLARE macro, and while we're there, separate DECLARE and DEFINE,
D: as definitions of per-cpu data cannot live in modules. This also
D: means that accidental direct references to per-cpu variables will
D: be caught at compile time.

diff -urpN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.28.23931/arch/ia64/kernel/perfmon.c linux-2.5.28.23931.updated/arch/ia64/kernel/perfmon.c
--- linux-2.5.28.23931/arch/ia64/kernel/perfmon.c Thu Jul 25 11:49:11 2002
+++ linux-2.5.28.23931.updated/arch/ia64/kernel/perfmon.c Thu Jul 25 12:07:54 2002
@@ -369,8 +369,8 @@ static pmu_config_t pmu_conf; /* PMU co
static pfm_session_t pfm_sessions; /* global sessions information */
static struct proc_dir_entry *perfmon_dir; /* for debug only */
static pfm_stats_t pfm_stats;
-int __per_cpu_data pfm_syst_wide;
-static int __per_cpu_data pfm_dcr_pp;
+DEFINE_PER_CPU(int, pfm_syst_wide);
+static DEFINE_PER_CPU(int, pfm_dcr_pp);

/* sysctl() controls */
static pfm_sysctl_t pfm_sysctl;
diff -urpN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.28.23931/arch/ia64/kernel/setup.c linux-2.5.28.23931.updated/arch/ia64/kernel/setup.c
--- linux-2.5.28.23931/arch/ia64/kernel/setup.c Thu May 30 10:00:47 2002
+++ linux-2.5.28.23931.updated/arch/ia64/kernel/setup.c Thu Jul 25 12:08:02 2002
@@ -58,7 +58,7 @@ extern char _end;
unsigned long __per_cpu_offset[NR_CPUS];
#endif

-struct cpuinfo_ia64 cpu_info __per_cpu_data;
+DECLARE_PER_CPU(struct cpuinfo_ia64, cpu_info);

unsigned long ia64_phys_stacked_size_p8;
unsigned long ia64_cycles_per_usec;
diff -urpN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.28.23931/arch/ia64/kernel/smp.c linux-2.5.28.23931.updated/arch/ia64/kernel/smp.c
--- linux-2.5.28.23931/arch/ia64/kernel/smp.c Thu Jul 25 11:49:11 2002
+++ linux-2.5.28.23931.updated/arch/ia64/kernel/smp.c Thu Jul 25 12:08:08 2002
@@ -80,7 +80,7 @@ static volatile struct call_data_struct
#define IPI_CPU_STOP 1

/* This needs to be cacheline aligned because it is written to by *other* CPUs. */
-static __u64 ipi_operation __per_cpu_data ____cacheline_aligned;
+static DECLARE_PER_CPU(__u64, ipi_operation) ____cacheline_aligned;

static void
stop_this_cpu (void)
diff -urpN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.28.23931/include/asm-generic/percpu.h linux-2.5.28.23931.updated/include/asm-generic/percpu.h
--- linux-2.5.28.23931/include/asm-generic/percpu.h Thu Jul 25 11:49:11 2002
+++ linux-2.5.28.23931.updated/include/asm-generic/percpu.h Thu Jul 25 12:01:29 2002
@@ -1,13 +1,34 @@
#ifndef _ASM_GENERIC_PERCPU_H_
#define _ASM_GENERIC_PERCPU_H_
+#include <linux/compiler.h>

#define __GENERIC_PER_CPU
-#include <linux/compiler.h>
+#ifdef CONFIG_SMP

extern unsigned long __per_cpu_offset[NR_CPUS];

+/* Separate out the type, so (int[3], foo) works. */
+#ifndef MODULE
+#define DEFINE_PER_CPU(type, name) \
+ __attribute__((__section__(".percpu"))) __typeof__(type) name##__per_cpu
+#endif
+
/* var is in discarded region: offset to particular copy we want */
-#define per_cpu(var, cpu) (*RELOC_HIDE(&var, __per_cpu_offset[cpu]))
+#define per_cpu(var, cpu) (*RELOC_HIDE(&var##__per_cpu, __per_cpu_offset[cpu]))
#define __get_cpu_var(var) per_cpu(var, smp_processor_id())
+
+#else /* ! SMP */
+
+/* Can't define per-cpu variables in modules. Sorry --RR */
+#ifndef MODULE
+#define DEFINE_PER_CPU(type, name) \
+ __typeof__(type) name##__per_cpu
+#endif
+
+#define per_cpu(var, cpu) var##__per_cpu
+#define __get_cpu_var(var) var##__per_cpu
+#endif
+
+#define DECLARE_PER_CPU(type, name) extern __typeof__(type) name##__per_cpu

#endif /* _ASM_GENERIC_PERCPU_H_ */
diff -urpN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.28.23931/include/asm-ia64/percpu.h linux-2.5.28.23931.updated/include/asm-ia64/percpu.h
--- linux-2.5.28.23931/include/asm-ia64/percpu.h Thu Jul 25 11:49:10 2002
+++ linux-2.5.28.23931.updated/include/asm-ia64/percpu.h Thu Jul 25 12:04:06 2002
@@ -8,7 +8,7 @@

#ifdef __ASSEMBLY__

-#define THIS_CPU(var) (var) /* use this to mark accesses to per-CPU variables... */
+#define THIS_CPU(var) (var##__per_cpu) /* use this to mark accesses to per-CPU variables... */

#else /* !__ASSEMBLY__ */

@@ -16,8 +16,14 @@

extern unsigned long __per_cpu_offset[NR_CPUS];

-#define per_cpu(var, cpu) (*(__typeof__(&(var))) ((void *) &(var) + __per_cpu_offset[cpu]))
-#define __get_cpu_var(var) (var)
+#ifndef MODULE
+#define DEFINE_PER_CPU(type, name) \
+ __attribute__((__section__(".data.percpu"))) __typeof__(type) name##__per_cpu
+#endif
+#define DECLARE_PER_CPU(type, name) extern __typeof__(type) name##__per_cpu
+
+#define per_cpu(var, cpu) (*RELOC_HIDE(&var##__per_cpu, __per_cpu_offset[cpu]))
+#define __get_cpu_var(var) (var##__per_cpu)

#endif /* !__ASSEMBLY__ */

diff -urpN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.28.23931/include/asm-ia64/processor.h linux-2.5.28.23931.updated/include/asm-ia64/processor.h
--- linux-2.5.28.23931/include/asm-ia64/processor.h Thu Jul 25 11:49:10 2002
+++ linux-2.5.28.23931.updated/include/asm-ia64/processor.h Thu Jul 25 12:06:55 2002
@@ -134,7 +134,7 @@ struct ia64_psr {
* CPU type, hardware bug flags, and per-CPU state. Frequently used
* state comes earlier:
*/
-extern struct cpuinfo_ia64 {
+struct cpuinfo_ia64 {
/* irq_stat must be 64-bit aligned */
union {
struct {
@@ -175,7 +175,9 @@ extern struct cpuinfo_ia64 {
__u64 prof_counter;
__u64 prof_multiplier;
#endif
-} cpu_info __per_cpu_data;
+};
+
+DECLARE_PER_CPU(struct cpuinfo_ia64, cpu_info);

/*
* The "local" data pointer. It points to the per-CPU data of the currently executing
diff -urpN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.28.23931/include/linux/percpu.h linux-2.5.28.23931.updated/include/linux/percpu.h
--- linux-2.5.28.23931/include/linux/percpu.h Thu Jul 25 11:49:10 2002
+++ linux-2.5.28.23931.updated/include/linux/percpu.h Thu Jul 25 11:49:28 2002
@@ -1,16 +1,9 @@
#ifndef __LINUX_PERCPU_H
#define __LINUX_PERCPU_H
-#include <linux/config.h>
-
-#ifdef CONFIG_SMP
-#define __per_cpu_data __attribute__((section(".data.percpu")))
+#include <linux/spinlock.h> /* For preempt_disable() */
#include <asm/percpu.h>
-#else
-#define __per_cpu_data
-#define per_cpu(var, cpu) var
-#define __get_cpu_var(var) var
-#endif

#define get_cpu_var(var) ({ preempt_disable(); __get_cpu_var(var); })
#define put_cpu_var(var) preempt_enable()
+
#endif /* __LINUX_PERCPU_H */
diff -urpN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.28.23931/kernel/softirq.c linux-2.5.28.23931.updated/kernel/softirq.c
--- linux-2.5.28.23931/kernel/softirq.c Thu Jul 25 11:49:11 2002
+++ linux-2.5.28.23931.updated/kernel/softirq.c Thu Jul 25 12:05:55 2002
@@ -150,8 +150,8 @@ struct tasklet_head

/* Some compilers disobey section attribute on statics when not
initialized -- RR */
-static struct tasklet_head tasklet_vec __per_cpu_data = { NULL };
-static struct tasklet_head tasklet_hi_vec __per_cpu_data = { NULL };
+static DEFINE_PER_CPU(struct tasklet_head, tasklet_vec) = { NULL };
+static DEFINE_PER_CPU(struct tasklet_head, tasklet_hi_vec) = { NULL };

void __tasklet_schedule(struct tasklet_struct *t)
{
--
Anyone who quotes me in their sig is an idiot. -- Rusty Russell.
-
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