On Wed, Mar 16, 2016 at 08:54:34AM +0000, Ian Campbell wrote:

Where it appears that multiple instance of __dtbs_install_prep have
been running in parallel at least the apm and arm subdirectories of
arch/arm64/boot/dts, with both of them then racing in the 
    $(Q)if [ -d $(INSTALL_DTBS_PATH) ]; then mv $(INSTALL_DTBS_PATH) $(INSTALL_DTBS_PATH).old; fi
rule since apparently $(INSTALL_DTBS_PATH) existed during the "-d"
check but had gone by the time of the move.

I've already sent a patch several times to remove this line, I believe
it's finally queued for this merge window.

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