summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorDaniel Borkmann <dborkman@redhat.com>2014-09-10 15:01:02 +0200
committerDavid S. Miller <davem@davemloft.net>2014-09-10 14:05:07 -0700
commitb954d83421d51d822c42e5ab7b65069b25ad3005 (patch)
tree0a419ab76ac8abbc459472b7c5b79800bc3cdc45
parent17fa1f983649580772e95ee95e2c096baa650219 (diff)
net: bpf: only build bpf_jit_binary_{alloc, free}() when jit selected
Since BPF JIT depends on the availability of module_alloc() and module_free() helpers (HAVE_BPF_JIT and MODULES), we better build that code only in case we have BPF_JIT in our config enabled, just like with other JIT code. Fixes builds for arm/marzen_defconfig and sh/rsk7269_defconfig. ==================== kernel/built-in.o: In function `bpf_jit_binary_alloc': /home/cwang/linux/kernel/bpf/core.c:144: undefined reference to `module_alloc' kernel/built-in.o: In function `bpf_jit_binary_free': /home/cwang/linux/kernel/bpf/core.c:164: undefined reference to `module_free' make: *** [vmlinux] Error 1 ==================== Reported-by: Fengguang Wu <fengguang.wu@intel.com> Fixes: 738cbe72adc5 ("net: bpf: consolidate JIT binary allocator") Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/linux/filter.h78
-rw-r--r--kernel/bpf/core.c2
2 files changed, 41 insertions, 39 deletions
diff --git a/include/linux/filter.h b/include/linux/filter.h
index 4b59edead908..1a0bc6d134d7 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -4,12 +4,18 @@
#ifndef __LINUX_FILTER_H__
#define __LINUX_FILTER_H__
+#include <stdarg.h>
+
#include <linux/atomic.h>
#include <linux/compat.h>
#include <linux/skbuff.h>
+#include <linux/linkage.h>
+#include <linux/printk.h>
#include <linux/workqueue.h>
-#include <uapi/linux/filter.h>
+
#include <asm/cacheflush.h>
+
+#include <uapi/linux/filter.h>
#include <uapi/linux/bpf.h>
struct sk_buff;
@@ -363,14 +369,6 @@ struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
gfp_t gfp_extra_flags);
void __bpf_prog_free(struct bpf_prog *fp);
-typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size);
-
-struct bpf_binary_header *
-bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
- unsigned int alignment,
- bpf_jit_fill_hole_t bpf_fill_ill_insns);
-void bpf_jit_binary_free(struct bpf_binary_header *hdr);
-
static inline void bpf_prog_unlock_free(struct bpf_prog *fp)
{
bpf_prog_unlock_ro(fp);
@@ -393,6 +391,38 @@ void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp);
u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
void bpf_int_jit_compile(struct bpf_prog *fp);
+#ifdef CONFIG_BPF_JIT
+typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size);
+
+struct bpf_binary_header *
+bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
+ unsigned int alignment,
+ bpf_jit_fill_hole_t bpf_fill_ill_insns);
+void bpf_jit_binary_free(struct bpf_binary_header *hdr);
+
+void bpf_jit_compile(struct bpf_prog *fp);
+void bpf_jit_free(struct bpf_prog *fp);
+
+static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
+ u32 pass, void *image)
+{
+ pr_err("flen=%u proglen=%u pass=%u image=%pK\n",
+ flen, proglen, pass, image);
+ if (image)
+ print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET,
+ 16, 1, image, proglen, false);
+}
+#else
+static inline void bpf_jit_compile(struct bpf_prog *fp)
+{
+}
+
+static inline void bpf_jit_free(struct bpf_prog *fp)
+{
+ bpf_prog_unlock_free(fp);
+}
+#endif /* CONFIG_BPF_JIT */
+
#define BPF_ANC BIT(15)
static inline u16 bpf_anc_helper(const struct sock_filter *ftest)
@@ -440,36 +470,6 @@ static inline void *bpf_load_pointer(const struct sk_buff *skb, int k,
return bpf_internal_load_pointer_neg_helper(skb, k, size);
}
-#ifdef CONFIG_BPF_JIT
-#include <stdarg.h>
-#include <linux/linkage.h>
-#include <linux/printk.h>
-
-void bpf_jit_compile(struct bpf_prog *fp);
-void bpf_jit_free(struct bpf_prog *fp);
-
-static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
- u32 pass, void *image)
-{
- pr_err("flen=%u proglen=%u pass=%u image=%pK\n",
- flen, proglen, pass, image);
- if (image)
- print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET,
- 16, 1, image, proglen, false);
-}
-#else
-#include <linux/slab.h>
-
-static inline void bpf_jit_compile(struct bpf_prog *fp)
-{
-}
-
-static inline void bpf_jit_free(struct bpf_prog *fp)
-{
- bpf_prog_unlock_free(fp);
-}
-#endif /* CONFIG_BPF_JIT */
-
static inline int bpf_tell_extensions(void)
{
return SKF_AD_MAX;
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 8ee520f0ec70..8b7002488251 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -128,6 +128,7 @@ void __bpf_prog_free(struct bpf_prog *fp)
}
EXPORT_SYMBOL_GPL(__bpf_prog_free);
+#ifdef CONFIG_BPF_JIT
struct bpf_binary_header *
bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
unsigned int alignment,
@@ -163,6 +164,7 @@ void bpf_jit_binary_free(struct bpf_binary_header *hdr)
{
module_free(NULL, hdr);
}
+#endif /* CONFIG_BPF_JIT */
/* Base function for offset calculation. Needs to go into .text section,
* therefore keeping it non-static as well; will also be used by JITs