powerpc/bpf/jit: Disable classic BPF JIT on ppc64le

commit 844e3be47693f92a108cb1fb3b0606bf25e9c7a6 upstream.

Classic BPF JIT was never ported completely to work on little endian
powerpc. However, it can be enabled and will crash the system when used.
As such, disable use of BPF JIT on ppc64le.

Fixes: 7c105b63bd98 ("powerpc: Add CONFIG_CPU_LITTLE_ENDIAN kernel config option.")
Reported-by: Thadeu Lima de Souza Cascardo <cascardo@redhat.com>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Thadeu Lima de Souza Cascardo <cascardo@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
[bwh: Backported to 3.16: config symbol is BPF_JIT and also depends on PPC64]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 80b94b0add1f494e600db71170a966c2271c5e58..5ff5ab0411b37267d06d052818c52f61037261c1 100644 (file)
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -124,7 +124,7 @@ config PPC
        select IRQ_FORCED_THREADING
        select HAVE_RCU_TABLE_FREE if SMP
        select HAVE_SYSCALL_TRACEPOINTS
-       select HAVE_BPF_JIT if PPC64
+       select HAVE_BPF_JIT if PPC64 && CPU_BIG_ENDIAN
        select HAVE_ARCH_JUMP_LABEL
        select ARCH_HAVE_NMI_SAFE_CMPXCHG
        select GENERIC_SMP_IDLE_THREAD