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Re: [libvirt] [PATCH 3/3] qemu: avoid dead store in doPeer2PeerMigrate3



On 08/05/2011 11:15 PM, Eric Blake wrote:
On 08/05/2011 02:12 AM, Alex Jia wrote:
On 08/04/2011 10:27 PM, Eric Blake wrote:
On 08/03/2011 11:30 PM, Alex Jia wrote:
Value stored to 'ret' is never read. If Confirm3 returns -1, there's
nothing
more we can do, here should remove this dead assignment.

* src/qemu/qemu_migration.c: kill dead assignment.

Signed-off-by: Alex Jia<ajia redhat com>
---
src/qemu/qemu_migration.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)

I'm thinking NACK as written. We should probably emit a log message if
confirm failed, at which point, ret would be used in the conditional
deciding whether to do a log message. Furthermore, libvirt.c
virDomainMigrateVersion3 has the same bug with a dead assignment to
ret; we should solve it in the same way for both implementations.

Eric, I haven't figured out a apposite error number in virterror.h,
whether we need to define a new error number like this:

VIR_ERR_MIGRATE_CONFIRM_FAILED = 75, /* a migration finished, but
confirmation failed, there is a domain probably left in 'paused' state
on source.*/

That's if we want to report the error back to the caller and fail the API. But the migration happened - it is running on the destination, so I think we have to make the API return success. Which means that we don't need a new VIR_ERR_* value, rather, we just need a new VIR_WARN() call to guarantee a log entry but nothing further.

Yeah, only need to record warning information into log.

Thanks,
Alex


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