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Date: Sun, 14 Dec 2014 12:21:15 -0800 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Denis Kirjanov <kda@...ux-powerpc.org>, Markos Chandras <markos.chandras@...tec.com>, "David S. Miller" <davem@...emloft.net> Subject: [PATCH 3.18 04/19] mips: bpf: Fix broken BPF_MOD 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Denis Kirjanov <kda@...ux-powerpc.org> [ Upstream commit 2e46477a12f6fd273e31a220b155d66e8352198c ] Remove optimize_div() from BPF_MOD | BPF_K case since we don't know the dividend and fix the emit_mod() by reading the mod operation result from HI register Signed-off-by: Denis Kirjanov <kda@...ux-powerpc.org> Reviewed-by: Markos Chandras <markos.chandras@...tec.com> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- arch/mips/net/bpf_jit.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/arch/mips/net/bpf_jit.c +++ b/arch/mips/net/bpf_jit.c @@ -426,7 +426,7 @@ static inline void emit_mod(unsigned int u32 *p = &ctx->target[ctx->idx]; uasm_i_divu(&p, dst, src); p = &ctx->target[ctx->idx + 1]; - uasm_i_mflo(&p, dst); + uasm_i_mfhi(&p, dst); } ctx->idx += 2; /* 2 insts */ } @@ -971,7 +971,7 @@ load_ind: break; case BPF_ALU | BPF_MOD | BPF_K: /* A %= k */ - if (k == 1 || optimize_div(&k)) { + if (k == 1) { ctx->flags |= SEEN_A; emit_jit_reg_move(r_A, r_zero, ctx); } else { -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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