[PATCH stable v4.4 1/8] powerpc/fsl: Enable runtime patching if nospectre_v2 boot arg is used

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 --- arch/powerpc/kernel/setup_32.c | 1 + arch/powerpc/kernel/setup_64.c | 1 + 2 files changed, 2 insertions(+)

diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c index 5a9f035bcd6b..cb37f27bb928 100644 --- 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();

diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index 6bb731ababc6..11590f6cb2f9 100644 --- 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();