tree e83cb2206c82deeb3152fdf77b9395ed452f0a95
parent 48fe9e9488743eec9b7c1addd3c93f12f2123d54
author Oliver O'Halloran <oohall@gmail.com> 1491189912 +1000
committer Michael Ellerman <mpe@ellerman.id.au> 1491392421 +1000

powerpc/64: Fix flush_(d|i)cache_range() called from modules

When the kernel is compiled to use 64bit ABIv2 the _GLOBAL() macro does
not include a global entry point. A function's global entry point is
used when the function is called from a different TOC context and in the
kernel this typically means a call from a module into the vmlinux (or
vice-versa).

There are a few exported asm functions declared with _GLOBAL() and
calling them from a module will likely crash the kernel since any TOC
relative load will yield garbage.

flush_icache_range() and flush_dcache_range() are both exported to
modules, and use the TOC, so must use _GLOBAL_TOC().

Fixes: 721aeaa9fdf3 ("powerpc: Build little endian ppc64 kernel with ABIv2")
Cc: stable@vger.kernel.org # v3.16+
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>