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| author | Dexuan Cui <decui@microsoft.com> | 2018-09-17 06:14:54 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-30 17:49:55 +0200 |
| commit | 41e270f6898e7502be9fd6920ee0a108ca259d36 (patch) | |
| tree | f74679a9255c3b509d8c6cf1e400f772e4ff5a48 /kernel/kexec_file.c | |
| parent | Linux 4.19-rc6 (diff) | |
| download | linux-41e270f6898e7502be9fd6920ee0a108ca259d36.tar.xz linux-41e270f6898e7502be9fd6920ee0a108ca259d36.zip | |
Drivers: hv: vmbus: Use get/put_cpu() in vmbus_connect()
With CONFIG_DEBUG_PREEMPT=y, I always see this warning:
BUG: using smp_processor_id() in preemptible [00000000]
Fix the false warning by using get/put_cpu().
Here vmbus_connect() sends a message to the host and waits for the
host's response. The host will deliver the response message and an
interrupt on CPU msg->target_vcpu, and later the interrupt handler
will wake up vmbus_connect(). vmbus_connect() doesn't really have
to run on the same cpu as CPU msg->target_vcpu, so it's safe to
call put_cpu() just here.
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Cc: stable@vger.kernel.org
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/kexec_file.c')
0 files changed, 0 insertions, 0 deletions