powerpc/pseries: Don't attempt to acquire drc during memory hot add for assigned lmbs

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Check if an LMB is assigned before attempting to call dlpar_acquire_drc
in order to avoid any unnecessary rtas calls. This substantially
reduces the running time of memory hot add on lpars with large amounts
of memory.

[mpe: We need to explicitly set rc to 0 in the success case, otherwise
 the compiler might think we use rc without initialising it.]

Fixes: c21f515c74 ("powerpc/pseries: Make the acquire/release of the drc for memory a seperate step")
Cc: stable@vger.kernel.org # v4.11+
Signed-off-by: John Allen <jallen@linux.vnet.ibm.com>
Reviewed-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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John Allen 2017-08-23 12:18:43 -05:00 • committed by Michael Ellerman

parent 7def9a2418

commit afb5519fdb

1 changed files with 4 additions and 0 deletions

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arch/powerpc/platforms/pseries/hotplug-memory.c

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