svcrdma: Remove DMA map accounting
authorChuck Lever <chuck.lever@oracle.com>
Tue, 29 Nov 2016 16:04:58 +0000 (11:04 -0500)
committerJ. Bruce Fields <bfields@redhat.com>
Wed, 30 Nov 2016 22:31:13 +0000 (17:31 -0500)
commitdd6fd213b05e7a1f590b470500343dd97c3a32c1
treed622a047d2990e6ef4da4b9665fb01805edb17cd
parente4eb42cecc6dc546aac888ee4913d59121e886ee
svcrdma: Remove DMA map accounting

Clean up: sc_dma_used is not required for correct operation. It is
simply a debugging tool to report when svcrdma has leaked DMA maps.

However, manipulating an atomic has a measurable CPU cost, and DMA
map accounting specific to svcrdma will be meaningless once svcrdma
is converted to use the new generic r/w API.

A similar kind of debug accounting can be done simply by enabling
the IOMMU or by using CONFIG_DMA_API_DEBUG, CONFIG_IOMMU_DEBUG, and
CONFIG_IOMMU_LEAK.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
include/linux/sunrpc/svc_rdma.h
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
net/sunrpc/xprtrdma/svc_rdma_transport.c