kstrdup_quotable_cmdline and gfp flags

[Rasmus Villemoes]

kstrdup_quotable_cmdline takes gfp flags and passes those on to
kstrdup_quotable, but before that it has done a kmalloc(PAGE_SIZE) with
a hard-coded GFP_KERNEL. There is one caller of kstrdup_quotable_cmdline
which passes GFP_ATOMIC, and the commit introducing that (65a3c2748e)
conveniently has this piece of history:

    v2: Use GFP_ATOMIC while holding the rcu lock per Chris Wilson

So, should the GFP_KERNEL in kstrdup_quotable_cmdline simply be changed
to use the passed-in gfp, or is there some deeper reason for the
GFP_KERNEL (in which case it doesn't really make sense to take gfp at
all...)? It came from a tree-wide GFP_TEMPORARY -> GFP_KERNEL conversion.

Rasmus