diff options
| author | Daniel Borkmann <daniel@iogearbox.net> | 2018-05-14 23:22:31 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2018-05-14 19:11:45 -0700 |
| commit | 09ece3d0f2ee524b8d1d3c775d9eeb50c40558d8 (patch) | |
| tree | 8328afe355615ebeb98b5a92c3ebc34c76324c9f /arch/arm64 | |
| parent | 38ca930601631585fbd7826f8f6908055a8dbc9e (diff) | |
| download | linux-09ece3d0f2ee524b8d1d3c775d9eeb50c40558d8.tar.bz2 | |
bpf, arm64: save 4 bytes of unneeded stack space
Follow-up to 816d9ef32a8b ("bpf, arm64: remove ld_abs/ld_ind") in
that the extra 4 byte JIT scratchpad is not needed anymore since it
was in ld_abs/ld_ind as stack buffer for bpf_load_pointer().
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/net/bpf_jit_comp.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c index 0b40c8fb0706..85113cab2046 100644 --- a/arch/arm64/net/bpf_jit_comp.c +++ b/arch/arm64/net/bpf_jit_comp.c @@ -21,7 +21,6 @@ #include <linux/bpf.h> #include <linux/filter.h> #include <linux/printk.h> -#include <linux/skbuff.h> #include <linux/slab.h> #include <asm/byteorder.h> @@ -188,7 +187,7 @@ static int build_prologue(struct jit_ctx *ctx) * | ... | BPF prog stack * | | * +-----+ <= (BPF_FP - prog->aux->stack_depth) - * |RSVD | JIT scratchpad + * |RSVD | padding * current A64_SP => +-----+ <= (BPF_FP - ctx->stack_size) * | | * | ... | Function call stack @@ -220,9 +219,7 @@ static int build_prologue(struct jit_ctx *ctx) return -1; } - /* 4 byte extra for skb_copy_bits buffer */ - ctx->stack_size = prog->aux->stack_depth + 4; - ctx->stack_size = STACK_ALIGN(ctx->stack_size); + ctx->stack_size = STACK_ALIGN(prog->aux->stack_depth); /* Set up function call stack */ emit(A64_SUB_I(1, A64_SP, A64_SP, ctx->stack_size), ctx); |