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powerpc64/bpf: Do not save/restore LR on each call to bpf_stf_barrier()

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Instead of saving and restoring LR before each invocation to
bpf_stf_barrier(), set SEEN_FUNC flag so that we save/restore LR in
prologue/epilogue.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/4446f25478d82a2a4ac9dab2ebdfd88ddf923eb7.1644834730.git.naveen.n.rao@linux.vnet.ibm.com
This commit is contained in:
Naveen N. Rao 2022-02-14 16:11:38 +05:30 committed by Michael Ellerman
parent 0ffdbce6f4
commit c2067f7f88
1 changed files with 1 additions and 2 deletions
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3
arch/powerpc/net/bpf_jit_comp64.c
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@ -690,11 +690,10 @@ emit_clear:
EMIT(PPC_RAW_ORI(_R31, _R31, 0));
break;
case STF_BARRIER_FALLBACK:
EMIT(PPC_RAW_MFLR(b2p[TMP_REG_1]));
ctx->seen |= SEEN_FUNC;
PPC_LI64(12, dereference_kernel_function_descriptor(bpf_stf_barrier));
EMIT(PPC_RAW_MTCTR(12));
EMIT(PPC_RAW_BCTRL());
EMIT(PPC_RAW_MTLR(b2p[TMP_REG_1]));
break;
case STF_BARRIER_NONE:
break;