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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>
This commit is contained in:
Daniel Borkmann 2018-02-26 22:13:52 +01:00 committed by Alexei Starovoitov
parent 6f1b5a2b58
commit 71d22d58b6
1 changed files with 2 additions and 13 deletions
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15
arch/x86/net/bpf_jit_comp.c
View File

@ -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 {