linux-kernel - [bpf-next 1/3] bpf: Move bpf_prog_clone

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Date:   Wed, 7 Jul 2021 04:38:09 +0000
From:   He Fengqing <hefengqing@...wei.com>
To:     <ast@...nel.org>, <daniel@...earbox.net>, <andrii@...nel.org>,
        <kafai@...com>, <songliubraving@...com>, <yhs@...com>,
        <john.fastabend@...il.com>, <kpsingh@...nel.org>
CC:     <davem@...emloft.net>, <kuba@...nel.org>, <netdev@...r.kernel.org>,
        <bpf@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [bpf-next 1/3] bpf: Move bpf_prog_clone_free into filter.h file

Move bpf_prog_clone_free function into filter.h, so we can use
it in other file.

Signed-off-by: He Fengqing <hefengqing@...wei.com>
---
 include/linux/filter.h | 15 +++++++++++++++
 kernel/bpf/core.c      | 20 +-------------------
 2 files changed, 16 insertions(+), 19 deletions(-)

diff --git a/include/linux/filter.h b/include/linux/filter.h
index 472f97074da0..f39e008a377d 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -884,6 +884,21 @@ 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);
 
+static inline void bpf_prog_clone_free(struct bpf_prog *fp)
+{
+	/* aux was stolen by the other clone, so we cannot free
+	 * it from this path! It will be freed eventually by the
+	 * other program on release.
+	 *
+	 * At this point, we don't need a deferred release since
+	 * clone is guaranteed to not be locked.
+	 */
+	fp->aux = NULL;
+	fp->stats = NULL;
+	fp->active = NULL;
+	__bpf_prog_free(fp);
+}
+
 static inline void bpf_prog_unlock_free(struct bpf_prog *fp)
 {
 	__bpf_prog_free(fp);
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 034ad93a1ad7..49b0311f48c1 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -238,10 +238,7 @@ struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
 		/* We keep fp->aux from fp_old around in the new
 		 * reallocated structure.
 		 */
-		fp_old->aux = NULL;
-		fp_old->stats = NULL;
-		fp_old->active = NULL;
-		__bpf_prog_free(fp_old);
+		bpf_prog_clone_free(fp_old);
 	}
 
 	return fp;
@@ -1102,21 +1099,6 @@ static struct bpf_prog *bpf_prog_clone_create(struct bpf_prog *fp_other,
 	return fp;
 }
 
-static void bpf_prog_clone_free(struct bpf_prog *fp)
-{
-	/* aux was stolen by the other clone, so we cannot free
-	 * it from this path! It will be freed eventually by the
-	 * other program on release.
-	 *
-	 * At this point, we don't need a deferred release since
-	 * clone is guaranteed to not be locked.
-	 */
-	fp->aux = NULL;
-	fp->stats = NULL;
-	fp->active = NULL;
-	__bpf_prog_free(fp);
-}
-
 void bpf_jit_prog_release_other(struct bpf_prog *fp, struct bpf_prog *fp_other)
 {
 	/* We have to repoint aux->prog to self, as we don't
-- 
2.25.1