Commit 8f5f525d authored by Oliver O'Halloran's avatar Oliver O'Halloran Committed by Michael Ellerman

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: 721aeaa9 ("powerpc: Build little endian ppc64 kernel with ABIv2")
Cc: stable@vger.kernel.org # v3.16+
Signed-off-by: default avatarOliver O'Halloran <oohall@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 48fe9e94
......@@ -67,7 +67,7 @@ PPC64_CACHES:
* flush all bytes from start through stop-1 inclusive
*/
_GLOBAL(flush_icache_range)
_GLOBAL_TOC(flush_icache_range)
BEGIN_FTR_SECTION
PURGE_PREFETCHED_INS
blr
......@@ -120,7 +120,7 @@ EXPORT_SYMBOL(flush_icache_range)
*
* flush all bytes from start to stop-1 inclusive
*/
_GLOBAL(flush_dcache_range)
_GLOBAL_TOC(flush_dcache_range)
/*
* Flush the data cache to memory
......
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