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bpf, arm32: save 4 bytes of unneeded stack space

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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@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel Borkmann 2018-05-14 23:22:30 +02:00 committed by Alexei Starovoitov
parent 36256009b2
commit 38ca930601
1 changed files with 3 additions and 10 deletions
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13
arch/arm/net/bpf_jit_32.c
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@ -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