Commit 09ece3d0 authored by Daniel Borkmann's avatar Daniel Borkmann Committed by Alexei Starovoitov

bpf, arm64: save 4 bytes of unneeded stack space

Follow-up to 816d9ef3 ("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: default avatarDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 38ca9306
......@@ -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);
......
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