diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0096-x86-bpf_jit-small-optimization-in-emit_bpf_tail_call.patch')
-rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0096-x86-bpf_jit-small-optimization-in-emit_bpf_tail_call.patch | 71 |
1 files changed, 0 insertions, 71 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0096-x86-bpf_jit-small-optimization-in-emit_bpf_tail_call.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0096-x86-bpf_jit-small-optimization-in-emit_bpf_tail_call.patch deleted file mode 100644 index 28963f0c..00000000 --- a/common/recipes-kernel/linux/linux-yocto-4.9.21/0096-x86-bpf_jit-small-optimization-in-emit_bpf_tail_call.patch +++ /dev/null @@ -1,71 +0,0 @@ -From 7beac55cc4c612a3e74debd1d82a01f375b5a187 Mon Sep 17 00:00:00 2001 -From: Eric Dumazet <edumazet@google.com> -Date: Mon, 29 Jan 2018 02:48:54 +0100 -Subject: [PATCH 096/103] x86: bpf_jit: small optimization in - emit_bpf_tail_call() - -[ upstream commit 84ccac6e7854ebbfb56d2fc6d5bef9be49bb304c ] - -Saves 4 bytes replacing following instructions : - -lea rax, [rsi + rdx * 8 + offsetof(...)] -mov rax, qword ptr [rax] -cmp rax, 0 - -by : - -mov rax, [rsi + rdx * 8 + offsetof(...)] -test rax, rax - -Signed-off-by: Eric Dumazet <edumazet@google.com> -Cc: Alexei Starovoitov <ast@kernel.org> -Cc: Daniel Borkmann <daniel@iogearbox.net> -Acked-by: Daniel Borkmann <daniel@iogearbox.net> -Acked-by: Alexei Starovoitov <ast@kernel.org> -Signed-off-by: David S. Miller <davem@davemloft.net> -Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> ---- - arch/x86/net/bpf_jit_comp.c | 9 ++++----- - 1 file changed, 4 insertions(+), 5 deletions(-) - -diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c -index 15f7436..ece29e2 100644 ---- a/arch/x86/net/bpf_jit_comp.c -+++ b/arch/x86/net/bpf_jit_comp.c -@@ -281,7 +281,7 @@ static void emit_bpf_tail_call(u8 **pprog) - EMIT4(0x48, 0x8B, 0x46, /* mov rax, qword ptr [rsi + 16] */ - offsetof(struct bpf_array, map.max_entries)); - EMIT3(0x48, 0x39, 0xD0); /* cmp rax, rdx */ --#define OFFSET1 47 /* number of bytes to jump */ -+#define OFFSET1 43 /* number of bytes to jump */ - EMIT2(X86_JBE, OFFSET1); /* jbe out */ - label1 = cnt; - -@@ -290,21 +290,20 @@ static void emit_bpf_tail_call(u8 **pprog) - */ - EMIT2_off32(0x8B, 0x85, -STACKSIZE + 36); /* mov eax, dword ptr [rbp - 516] */ - EMIT3(0x83, 0xF8, MAX_TAIL_CALL_CNT); /* cmp eax, MAX_TAIL_CALL_CNT */ --#define OFFSET2 36 -+#define OFFSET2 32 - EMIT2(X86_JA, OFFSET2); /* ja out */ - label2 = cnt; - EMIT3(0x83, 0xC0, 0x01); /* add eax, 1 */ - EMIT2_off32(0x89, 0x85, -STACKSIZE + 36); /* mov dword ptr [rbp - 516], eax */ - - /* prog = array->ptrs[index]; */ -- EMIT4_off32(0x48, 0x8D, 0x84, 0xD6, /* lea rax, [rsi + rdx * 8 + offsetof(...)] */ -+ EMIT4_off32(0x48, 0x8B, 0x84, 0xD6, /* mov rax, [rsi + rdx * 8 + offsetof(...)] */ - offsetof(struct bpf_array, ptrs)); -- EMIT3(0x48, 0x8B, 0x00); /* mov rax, qword ptr [rax] */ - - /* if (prog == NULL) - * goto out; - */ -- EMIT4(0x48, 0x83, 0xF8, 0x00); /* cmp rax, 0 */ -+ EMIT3(0x48, 0x85, 0xC0); /* test rax,rax */ - #define OFFSET3 10 - EMIT2(X86_JE, OFFSET3); /* je out */ - label3 = cnt; --- -2.7.4 - |