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Message-Id: <20180514002612.12083-5-daniel@iogearbox.net> Date: Mon, 14 May 2018 02:26:10 +0200 From: Daniel Borkmann <daniel@...earbox.net> To: alexei.starovoitov@...il.com Cc: netdev@...r.kernel.org, Daniel Borkmann <daniel@...earbox.net> Subject: [PATCH bpf-next 4/6] bpf, arm32: save 4 bytes of unneeded stack space The extra skb_copy_bits() buffer is not used anymore, therefore remove the extra 4 byte stack space requirement. Signed-off-by: Daniel Borkmann <daniel@...earbox.net> --- arch/arm/net/bpf_jit_32.c | 13 +++---------- 1 file changed, 3 insertions(+), 10 deletions(-) diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c index 82689b9..d3ea645 100644 --- a/arch/arm/net/bpf_jit_32.c +++ b/arch/arm/net/bpf_jit_32.c @@ -234,18 +234,11 @@ static void jit_fill_hole(void *area, unsigned int size) #define SCRATCH_SIZE 80 /* total stack size used in JITed code */ -#define _STACK_SIZE \ - (ctx->prog->aux->stack_depth + \ - + SCRATCH_SIZE + \ - + 4 /* extra for skb_copy_bits buffer */) - -#define STACK_SIZE ALIGN(_STACK_SIZE, STACK_ALIGNMENT) +#define _STACK_SIZE (ctx->prog->aux->stack_depth + SCRATCH_SIZE) +#define STACK_SIZE ALIGN(_STACK_SIZE, STACK_ALIGNMENT) /* Get the offset of eBPF REGISTERs stored on scratch space. */ -#define STACK_VAR(off) (STACK_SIZE-off-4) - -/* Offset of skb_copy_bits buffer */ -#define SKB_BUFFER STACK_VAR(SCRATCH_SIZE) +#define STACK_VAR(off) (STACK_SIZE - off) #if __LINUX_ARM_ARCH__ < 7 -- 2.9.5
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