[PATCH] profiler fix for non-SMP linuk-2.4.6-rc4-mm1

[Santiago Gala]

I need the patches shown here, from J.A. MagallÃn, to have 2.6.9-rc4-mm1
running on my TiBook (but they are slightly wrong).
http://lkml.org/lkml/2004/10/11/111

Without this patches, I'm having one error like:

Oct 11 21:35:12 marlow Oops: kernel access of bad area, sig: 11 [#148]
Oct 11 21:35:12 marlow NIP: C001AA98 LR: C0016CBC SP: D7E97F10 REGS:
d7e97e60 TRAP: 0300    Not tainted
Oct 11 21:35:12 marlow MSR: 00001032 EE: 0 PR: 0 FP: 0 ME: 1 IR/DR: 11
Oct 11 21:35:12 marlow DAR: 00015380, DSISR: 40000000
Oct 11 21:35:12 marlow TASK = dfece610[8077] 'apache2' THREAD:
d7e96000Last syscall: 156
Oct 11 21:35:12 marlow GPR00: 00015380 D7E97F10 DFECE610 00000002
000054E0 00000004 D7E97F18 0F8E0F7C
Oct 11 21:35:12 marlow GPR08: 00000000 00015380 000054E0 C0310000
82004422 1006B304 0FA29334 101A27A0
Oct 11 21:35:12 marlow GPR16: 0FA293B8 3003DDA0 101A2700 0FA293BC
FFFFF000 1016E178 0FA29328 0FA2B8BC
Oct 11 21:35:12 marlow GPR24: 101A2DC0 C00054E0 00000000 DFECE610
FFFFFFEA 101A2DC0 C03205B8 D7E97F10
Oct 11 21:35:12 marlow NIP [c001aa98] profile_hit+0x40/0x54
Oct 11 21:35:12 marlow LR [c0016cbc] setscheduler+0xf4/0x2b0
Oct 11 21:35:12 marlow Call trace:
Oct 11 21:35:12 marlow [c00054e0] ret_from_syscall+0x0/0x44

three times per second or so, though the kernel works enough to have me
shutting it down orderly. When I logged into gnome, the Oops was not
always in apache, but sometimes in nautilus or other apps.

The patch he sent does not work for non SMP configs (cut&paste error?)
The one I attach works for my laptop, while not changing the SMP part,
AFAIK.

This mm kernel is looking very stable, and I'll give it a try not
rebooting it till tomorrow or till I see some problems with my firewire
device (still giving problems for time to time here).

The patch is against rc4-mm1.

Regards
-- 
Santiago Gala <sgala@xxxxxxxxxxxx>
High Sierra Technology, SLU
--- linux-2.6.9-rc4-mm1/include/linux/profile.h	2004-10-11 19:52:04.000000000 +0200
+++ linux-2.6.9-rc4-mm1-mine/include/linux/profile.h	2004-10-11 23:17:01.000000000 +0200
@@ -8,6 +8,7 @@
 #include <linux/init.h>
 #include <linux/cpumask.h>
 #include <asm/errno.h>
+#include <asm/atomic.h>
 
 #define CPU_PROFILING	1
 #define SCHED_PROFILING	2
@@ -17,8 +18,8 @@
 
 /* init basic kernel profiler */
 void __init profile_init(void);
-void profile_tick(int, struct pt_regs *);
-void profile_hit(int, void *);
+void FASTCALL(__profile_hit(void *));
+
 #ifdef CONFIG_PROC_FS
 void create_prof_cpu_mask(struct proc_dir_entry *);
 #else
@@ -101,6 +102,26 @@
 
 #endif /* CONFIG_PROFILING */
 
+static inline void profile_hit(int type, void *pc)
+{
+	extern int prof_on;
+	extern atomic_t *prof_buffer;
+
+	if (prof_on == type && prof_buffer)
+		__profile_hit(pc);
+}
+
+static inline void profile_tick(int type, struct pt_regs *regs)
+{
+	extern cpumask_t prof_cpu_mask;
+
+	if (type != CPU_PROFILING)
+		return;
+	profile_hook(regs);
+	if (!user_mode(regs) && cpu_isset(smp_processor_id(), prof_cpu_mask))
+		profile_hit(type, (void *)profile_pc(regs));
+}
+
 #endif /* __KERNEL__ */
 
 #endif /* _LINUX_PROFILE_H */
--- linux-2.6.9-rc4-mm1/kernel/profile.c	2004-10-11 19:54:35.000000000 +0200
+++ linux-2.6.9-rc4-mm1-mine/kernel/profile.c	2004-10-11 23:34:19.000000000 +0200
@@ -34,10 +34,10 @@
 #define NR_PROFILE_HIT		(PAGE_SIZE/sizeof(struct profile_hit))
 #define NR_PROFILE_GRP		(NR_PROFILE_HIT/PROFILE_GRPSZ)
 
-static atomic_t *prof_buffer;
+atomic_t *prof_buffer;
 static unsigned long prof_len, prof_shift;
-static int prof_on;
-static cpumask_t prof_cpu_mask = CPU_MASK_ALL;
+int prof_on;
+cpumask_t prof_cpu_mask = CPU_MASK_ALL;
 #ifdef CONFIG_SMP
 static DEFINE_PER_CPU(struct profile_hit *[2], cpu_profile_hits);
 static DEFINE_PER_CPU(int, cpu_profile_flip);
@@ -284,14 +284,12 @@
 	up(&profile_flip_mutex);
 }
 
-void profile_hit(int type, void *__pc)
+void fastcall __profile_hit(void *__pc)
 {
 	unsigned long primary, secondary, flags, pc = (unsigned long)__pc;
 	int i, j, cpu;
 	struct profile_hit *hits;
 
-	if (prof_on != type || !prof_buffer)
-		return;
 	pc = min((pc - (unsigned long)_stext) >> prof_shift, prof_len - 1);
 	i = primary = (pc & (NR_PROFILE_GRP - 1)) << PROFILE_GRPSHIFT;
 	secondary = (~(pc << 1) & (NR_PROFILE_GRP - 1)) << PROFILE_GRPSHIFT;
@@ -380,26 +378,15 @@
 #else /* !CONFIG_SMP */
 #define profile_flip_buffers()		do { } while (0)
 #define profile_discard_flip_buffers()	do { } while (0)
-
-inline void profile_hit(int type, void *__pc)
-{
-	unsigned long pc;
-
+void __profile_hit(void *__pc)
+ {
+  	unsigned long pc;
+	 
 	pc = ((unsigned long)__pc - (unsigned long)_stext) >> prof_shift;
 	atomic_inc(&prof_buffer[min(pc, prof_len - 1)]);
-}
+ }
 #endif /* !CONFIG_SMP */
 
-void profile_tick(int type, struct pt_regs *regs)
-{
-	if (type == CPU_PROFILING)
-		profile_hook(regs);
-	if (prof_on != type || !prof_buffer)
-		return;
-	if (!user_mode(regs) && cpu_isset(smp_processor_id(), prof_cpu_mask))
-		profile_hit(type, (void *)profile_pc(regs));
-}
-
 #ifdef CONFIG_PROC_FS
 #include <linux/proc_fs.h>
 #include <asm/uaccess.h>

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