Reviewed-by: Wen Xiong<wenxiong@xxxxxxxxxxxxxxxxxx>
Thanks,
Wendy
Quoting Brian King <brking@xxxxxxxxxxxxxxxxxx>:
A kexec boot for some ipr SAS adapters was seen to take ~20 seconds
just doing ipr adapter initialization. This is due to the fact that
a kexec invokes the driver's shutdown handler which places the adapter
into a state that requires a hard reset and resulting firmware initialization
to be usable again, which takes significant time. By exporting
kexec_in_progress,
this process can be optimized significantly in the driver by essentially
placing the adapter into a state where this hardware reset and
re-initialization
can be bypassed, eliminating this delay in kexec boot.
Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx>
Cc: kexec <kexec@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Brian King <brking@xxxxxxxxxxxxxxxxxx>
---
kernel/kexec.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN kernel/kexec.c~kexec_export_in_prog kernel/kexec.c
--- scsi-queue/kernel/kexec.c~kexec_export_in_prog 2014-12-02
12:13:22.820325731 -0600
+++ scsi-queue-bjking1/kernel/kexec.c 2014-12-02 12:13:22.825325687 -0600
@@ -2768,3 +2768,5 @@ int kernel_kexec(void)
mutex_unlock(&kexec_mutex);
return error;
}
+
+EXPORT_SYMBOL_GPL(kexec_in_progress);
_
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