Linux 3.4 compat: d_make_root() replaces d_alloc_root() #776
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torvalds/linux@adc0e91 introduced
introduced d_make_root() as a replacement for d_alloc_root(). Further
commits appear to have removed d_alloc_root() from the Linux source
tree. This causes the following failure:
error: implicit declaration of function 'd_alloc_root'
[-Werror=implicit-function-declaration]
To correct this, we introduce an autotools check for d_alloc_root() and
use it whenever it is available.
Signed-off-by: Richard Yao ryao@gentoo.org