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authorDaniel Borkmann <daniel@iogearbox.net>2018-05-14 23:22:30 +0200
committerAlexei Starovoitov <ast@kernel.org>2018-05-14 19:11:45 -0700
commit38ca930601631585fbd7826f8f6908055a8dbc9e (patch)
tree82c96dc2a059162da559774905f576550c594b55
parent36256009b2d532621a5ee4b304da0e4b54e48acb (diff)
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@iogearbox.net> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
-rw-r--r--arch/arm/net/bpf_jit_32.c13
1 files changed, 3 insertions, 10 deletions
diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c
index 82689b999257..d3ea6454e775 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