linux-kernel - Re: [PATCH] connector: Some fixes for ia64 unaligned access errors

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Date:	Wed, 13 Dec 2006 00:08:29 -0600
From:	Erik Jacobson <erikj@....com>
To:	Andrew Morton <akpm@...l.org>
Cc:	Erik Jacobson <erikj@....com>, linux-kernel@...r.kernel.org,
	guillaume.thouvenin@...l.net, matthltc@...ibm.com
Subject: Re: [PATCH] connector: Some fixes for ia64 unaligned access errors

Hi.  I didn't want to leave this hanging and it stayed in my head so I
thought I'd better just finish it and test it.

I tried out this patch and it got rid of all three unaligned acces errors
I was seeing with process connectors and the patch is indeed much smaller.

I ran our container daemon program in debug mode to be sure the forks
and exits still worked right when the patch was applied and all seemed
well.

I applied this patch to x86_64 as well as a sanity check and it seems
working fine.

Things look good to me.  I'm ok if you prefer this patch, or the one
already in -mm.

Signed-off-by: Erik Jacobson <erikj@....com>
---

 cn_proc.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)
--- linux.orig/drivers/connector/cn_proc.c	2006-12-12 23:03:31.000000000 -0600
+++ linux/drivers/connector/cn_proc.c	2006-12-12 23:06:34.243535000 -0600
@@ -28,6 +28,7 @@
 #include <linux/init.h>
 #include <linux/connector.h>
 #include <asm/atomic.h>
+#include <asm/unaligned.h>
 
 #include <linux/cn_proc.h>
 
@@ -60,7 +61,7 @@
 	ev = (struct proc_event*)msg->data;
 	get_seq(&msg->seq, &ev->cpu);
 	ktime_get_ts(&ts); /* get high res monotonic timestamp */
-	ev->timestamp_ns = timespec_to_ns(&ts);
+	put_unaligned(timespec_to_ns(&ts), (__u64 *) &ev->timestamp_ns);
 	ev->what = PROC_EVENT_FORK;
 	ev->event_data.fork.parent_pid = task->real_parent->pid;
 	ev->event_data.fork.parent_tgid = task->real_parent->tgid;
@@ -88,7 +89,7 @@
 	ev = (struct proc_event*)msg->data;
 	get_seq(&msg->seq, &ev->cpu);
 	ktime_get_ts(&ts); /* get high res monotonic timestamp */
-	ev->timestamp_ns = timespec_to_ns(&ts);
+	put_unaligned(timespec_to_ns(&ts), (__u64 *) &ev->timestamp_ns);
 	ev->what = PROC_EVENT_EXEC;
 	ev->event_data.exec.process_pid = task->pid;
 	ev->event_data.exec.process_tgid = task->tgid;
@@ -124,7 +125,7 @@
 	     	return;
 	get_seq(&msg->seq, &ev->cpu);
 	ktime_get_ts(&ts); /* get high res monotonic timestamp */
-	ev->timestamp_ns = timespec_to_ns(&ts);
+	put_unaligned(timespec_to_ns(&ts), (__u64 *) &ev->timestamp_ns);
 
 	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
 	msg->ack = 0; /* not used */
@@ -146,7 +147,7 @@
 	ev = (struct proc_event*)msg->data;
 	get_seq(&msg->seq, &ev->cpu);
 	ktime_get_ts(&ts); /* get high res monotonic timestamp */
-	ev->timestamp_ns = timespec_to_ns(&ts);
+	put_unaligned(timespec_to_ns(&ts), (__u64 *) &ev->timestamp_ns);
 	ev->what = PROC_EVENT_EXIT;
 	ev->event_data.exit.process_pid = task->pid;
 	ev->event_data.exit.process_tgid = task->tgid;
@@ -181,7 +182,7 @@
 	ev = (struct proc_event*)msg->data;
 	msg->seq = rcvd_seq;
 	ktime_get_ts(&ts); /* get high res monotonic timestamp */
-	ev->timestamp_ns = timespec_to_ns(&ts);
+	put_unaligned(timespec_to_ns(&ts), (__u64 *) &ev->timestamp_ns);
 	ev->cpu = -1;
 	ev->what = PROC_EVENT_NONE;
 	ev->event_data.ack.err = err;
-
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