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Date: Tue, 18 Aug 2020 11:15:56 +0800 From: Zhen Lei <thunder.leizhen@...wei.com> To: Oliver O'Halloran <oohall@...il.com>, Dan Williams <dan.j.williams@...el.com>, Vishal Verma <vishal.l.verma@...el.com>, "Dave Jiang" <dave.jiang@...el.com>, Ira Weiny <ira.weiny@...el.com>, linux-nvdimm <linux-nvdimm@...ts.01.org>, linux-kernel <linux-kernel@...r.kernel.org> CC: Zhen Lei <thunder.leizhen@...wei.com> Subject: [PATCH 3/3] libnvdimm/bus: simplify walk_to_nvdimm_bus() I first want to move dev_WARN_ONCE() after "if (dev)" branch, but further I find the "if (dev)" can only be true when is_nvdimm_bus(dev) successed. No functional change. In fact, the compiler can optimize it correctly. I run "size drivers/nvdimm/bus.o" and find nothing has changed. So it's just source code level optimization, make us can read it faster. Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com> --- drivers/nvdimm/bus.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c index 955265656b96c73..1d89114cb6ab93e 100644 --- a/drivers/nvdimm/bus.c +++ b/drivers/nvdimm/bus.c @@ -316,10 +316,9 @@ struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev) for (dev = nd_dev; dev; dev = dev->parent) if (is_nvdimm_bus(dev)) - break; - dev_WARN_ONCE(nd_dev, !dev, "invalid dev, not on nd bus\n"); - if (dev) - return to_nvdimm_bus(dev); + return to_nvdimm_bus(dev); + + dev_WARN_ONCE(nd_dev, 1, "invalid dev, not on nd bus\n"); return NULL; } -- 1.8.3
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