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Commit 38ca9306 authored by Daniel Borkmann's avatar Daniel Borkmann Committed by Alexei Starovoitov
Browse files

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: default avatarDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 36256009

arch/arm/net/bpf_jit_32.c

+3 −10
Original line number Diff line number Diff line
@@ -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	(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