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Subject[PATCH 4.4 079/266] powerpc/fsl: Enable runtime patching if nospectre_v2 boot arg is used
Date
From: Diana Craciun <diana.craciun@nxp.com>

commit 3bc8ea8603ae4c1e09aca8de229ad38b8091fcb3 upstream.

If the user choses not to use the mitigations, replace
the code sequence with nops.

Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/powerpc/kernel/setup_32.c | 1 +
arch/powerpc/kernel/setup_64.c | 1 +
2 files changed, 2 insertions(+)

--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -323,6 +323,7 @@ void __init setup_arch(char **cmdline_p)
if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);

setup_barrier_nospec();
+ setup_spectre_v2();

paging_init();

--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -737,6 +737,7 @@ void __init setup_arch(char **cmdline_p)
ppc_md.setup_arch();

setup_barrier_nospec();
+ setup_spectre_v2();

paging_init();


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