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 <[email protected]>
---
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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