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authorDaniel Borkmann <daniel@iogearbox.net>2018-02-26 22:13:52 +0100
committerAlexei Starovoitov <ast@kernel.org>2018-02-27 09:18:58 -0800
commit71d22d58b6e507147a9008ce2fd690cf311c97f9 (patch)
tree674639a0147c7234c88e3e23d06dc6ff26a6d7b2 /arch
parent6f1b5a2b58d8470e5a8b25ab29f5fdb4616ffff8 (diff)
downloadlinux-stericsson-71d22d58b6e507147a9008ce2fd690cf311c97f9.tar.gz
bpf, x64: remove bpf_flush_icache
Unlike other archs flush_icache_range() is a noop on x64, therefore remove the JIT's bpf_flush_icache() altogether since not needed. Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Cc: Eric Dumazet <edumazet@google.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/net/bpf_jit_comp.c15
1 files changed, 2 insertions, 13 deletions
diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index cbf94d44f3d5..eb661fff94d7 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -11,10 +11,10 @@
#include <linux/netdevice.h>
#include <linux/filter.h>
#include <linux/if_vlan.h>
-#include <asm/cacheflush.h>
+#include <linux/bpf.h>
+
#include <asm/set_memory.h>
#include <asm/nospec-branch.h>
-#include <linux/bpf.h>
/*
* assembly code in arch/x86/net/bpf_jit.S
@@ -103,16 +103,6 @@ static int bpf_size_to_x86_bytes(int bpf_size)
#define X86_JLE 0x7E
#define X86_JG 0x7F
-static void bpf_flush_icache(void *start, void *end)
-{
- mm_segment_t old_fs = get_fs();
-
- set_fs(KERNEL_DS);
- smp_wmb();
- flush_icache_range((unsigned long)start, (unsigned long)end);
- set_fs(old_fs);
-}
-
#define CHOOSE_LOAD_FUNC(K, func) \
((int)K < 0 ? ((int)K >= SKF_LL_OFF ? func##_negative_offset : func) : func##_positive_offset)
@@ -1266,7 +1256,6 @@ skip_init_addrs:
bpf_jit_dump(prog->len, proglen, pass + 1, image);
if (image) {
- bpf_flush_icache(header, image + proglen);
if (!prog->is_func || extra_pass) {
bpf_jit_binary_lock_ro(header);
} else {