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Message-Id: <1203108958-1818-8-git-send-email-jason.wessel@windriver.com>
Date: Fri, 15 Feb 2008 14:55:58 -0600
From: Jason Wessel <jason.wessel@...driver.com>
To: mingo@...e.hu
Cc: linux-kernel@...r.kernel.org, Jan Kiszka <jan.kiszka@...mens.com>,
Jason Wessel <jason.wessel@...driver.com>
Subject: [PATCH 7/7] kgdb-light-v10: build core and arch pieces as a kernel module
From: Jan Kiszka <jan.kiszka@...mens.com>
The patch nicely demonstrates what deeper dependencies on kernel
services currently exist in kgdb-light. The following symbols were
unresolvable:
o send_IPI_allbutself(APIC_DM_NMI)
This required a new exported function so as not to
export really low level APIC functions and variables
The new one is: smp_debugger_sync
o machine_emergency_restart - for implementing "R0" gdb packet
o idle_task - kgdb tells the per-cpu idle tasks apart
o clocksource_touch_watchdog - obvious as to what it does
For simplicity reasons I just gpl-exported all of them. The result is
a fully modular kgdb that may help to reduce concerns regarding its
intrusiveness.
Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
Signed-off-by: Jason Wessel <jason.wessel@...driver.com>
---
arch/x86/kernel/kgdb-x86.c | 11 ++---------
arch/x86/kernel/reboot.c | 1 +
arch/x86/kernel/smp_32.c | 6 ++++++
arch/x86/kernel/smp_64.c | 5 +++++
include/asm-x86/smp_32.h | 5 +++++
include/asm-x86/smp_64.h | 4 ++++
kernel/sched.c | 1 +
kernel/time/clocksource.c | 1 +
lib/Kconfig.kgdb | 2 +-
lib/kgdb.c | 8 ++++++--
10 files changed, 32 insertions(+), 12 deletions(-)
diff --git a/arch/x86/kernel/kgdb-x86.c b/arch/x86/kernel/kgdb-x86.c
index 88bfa45..c36740c 100644
--- a/arch/x86/kernel/kgdb-x86.c
+++ b/arch/x86/kernel/kgdb-x86.c
@@ -46,12 +46,6 @@
#include <asm/apicdef.h>
#include <asm/system.h>
-#ifdef CONFIG_X86_32
-# include <mach_ipi.h>
-#else
-# include <asm/mach_apic.h>
-#endif
-
/*
* Put the error code here just in case the user cares:
*/
@@ -315,7 +309,6 @@ void kgdb_post_primary_code(struct pt_regs *regs, int e_vector, int err_code)
gdb_x86errcode = err_code;
}
-#ifdef CONFIG_SMP
/**
* kgdb_roundup_cpus - Get other CPUs into a holding pattern
* @flags: Current IRQ state
@@ -334,9 +327,8 @@ void kgdb_post_primary_code(struct pt_regs *regs, int e_vector, int err_code)
*/
void kgdb_roundup_cpus(unsigned long flags)
{
- send_IPI_allbutself(APIC_DM_NMI);
+ smp_debugger_sync();
}
-#endif
/**
* kgdb_arch_handle_exception - Handle architecture specific GDB packets.
@@ -565,3 +557,4 @@ struct kgdb_arch arch_kgdb_ops = {
.remove_all_hw_break = kgdb_remove_all_hw_break,
.correct_hw_break = kgdb_correct_hw_break,
};
+
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 5818dc2..66d7c27 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -375,6 +375,7 @@ void machine_emergency_restart(void)
}
}
}
+EXPORT_SYMBOL_GPL(machine_emergency_restart);
void machine_shutdown(void)
{
diff --git a/arch/x86/kernel/smp_32.c b/arch/x86/kernel/smp_32.c
index dc0cde9..2f35238 100644
--- a/arch/x86/kernel/smp_32.c
+++ b/arch/x86/kernel/smp_32.c
@@ -710,3 +710,9 @@ struct smp_ops smp_ops = {
.smp_call_function_mask = native_smp_call_function_mask,
};
EXPORT_SYMBOL_GPL(smp_ops);
+
+void smp_debugger_sync(void)
+{
+ send_IPI_allbutself(APIC_DM_NMI);
+}
+EXPORT_SYMBOL_GPL(smp_debugger_sync);
diff --git a/arch/x86/kernel/smp_64.c b/arch/x86/kernel/smp_64.c
index 2fd74b0..f5f419f 100644
--- a/arch/x86/kernel/smp_64.c
+++ b/arch/x86/kernel/smp_64.c
@@ -528,3 +528,8 @@ asmlinkage void smp_call_function_interrupt(void)
}
}
+void smp_debugger_sync(void)
+{
+ send_IPI_allbutself(APIC_DM_NMI);
+}
+EXPORT_SYMBOL_GPL(smp_debugger_sync);
diff --git a/include/asm-x86/smp_32.h b/include/asm-x86/smp_32.h
index 56152e3..19a1aa7 100644
--- a/include/asm-x86/smp_32.h
+++ b/include/asm-x86/smp_32.h
@@ -127,11 +127,16 @@ static inline int num_booting_cpus(void)
return cpus_weight(cpu_callout_map);
}
+extern void smp_debugger_sync(void);
+
#else /* CONFIG_SMP */
#define safe_smp_processor_id() 0
#define cpu_physical_id(cpu) boot_cpu_physical_apicid
+static inline void smp_debugger_sync(void)
+{}
+
#endif /* !CONFIG_SMP */
#ifdef CONFIG_X86_LOCAL_APIC
diff --git a/include/asm-x86/smp_64.h b/include/asm-x86/smp_64.h
index e0a7551..c52f46a 100644
--- a/include/asm-x86/smp_64.h
+++ b/include/asm-x86/smp_64.h
@@ -74,6 +74,7 @@ static inline int num_booting_cpus(void)
}
extern void smp_send_reschedule(int cpu);
+extern void smp_debugger_sync(void);
#else /* CONFIG_SMP */
@@ -81,6 +82,9 @@ extern unsigned int boot_cpu_id;
#define cpu_physical_id(cpu) boot_cpu_id
#define stack_smp_processor_id() 0
+static inline void smp_debugger_sync(void)
+{}
+
#endif /* !CONFIG_SMP */
#define safe_smp_processor_id() smp_processor_id()
diff --git a/kernel/sched.c b/kernel/sched.c
index 3eedd52..e2ffff4 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4463,6 +4463,7 @@ struct task_struct *idle_task(int cpu)
{
return cpu_rq(cpu)->idle;
}
+EXPORT_SYMBOL_GPL(idle_task);
/**
* find_process_by_pid - find a process with a matching PID value.
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index ace23d3..e83dc5d 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -238,6 +238,7 @@ void clocksource_touch_watchdog(void)
{
clocksource_resume_watchdog();
}
+EXPORT_SYMBOL_GPL(clocksource_touch_watchdog);
/**
* clocksource_get_next - Returns the selected clocksource
diff --git a/lib/Kconfig.kgdb b/lib/Kconfig.kgdb
index 9631ba3..413e3b8 100644
--- a/lib/Kconfig.kgdb
+++ b/lib/Kconfig.kgdb
@@ -1,6 +1,6 @@
menuconfig KGDB
- bool "KGDB: kernel debugging with remote gdb"
+ tristate "KGDB: kernel debugging with remote gdb"
select FRAME_POINTER
depends on HAVE_ARCH_KGDB
depends on DEBUG_KERNEL && EXPERIMENTAL
diff --git a/lib/kgdb.c b/lib/kgdb.c
index a453764..7a39853 100644
--- a/lib/kgdb.c
+++ b/lib/kgdb.c
@@ -91,13 +91,14 @@ static int kgdb_con_registered;
/* determine if kgdb console output should be used */
static int kgdb_use_con;
+#ifdef CONFIG_KGDB
static int __init opt_kgdb_con(char *str)
{
kgdb_use_con = 1;
return 0;
}
-
early_param("kgdbcon", opt_kgdb_con);
+#endif
module_param(kgdb_use_con, int, 0644);
@@ -1667,6 +1668,7 @@ void kgdb_breakpoint(void)
}
EXPORT_SYMBOL_GPL(kgdb_breakpoint);
+#ifdef CONFIG_KGDB
static int __init opt_kgdb_wait(char *str)
{
kgdb_break_asap = 1;
@@ -1676,5 +1678,7 @@ static int __init opt_kgdb_wait(char *str)
return 0;
}
-
early_param("kgdbwait", opt_kgdb_wait);
+#endif
+
+MODULE_LICENSE("GPL");
--
1.5.4
--
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