linux-kernel - [PATCH v2 3/3] btf: Switch module BTF attribute to sysfs_bin_attr_simple

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Message-Id: <20241228-sysfs-const-bin_attr-simple-v2-3-7c6f3f1767a3@weissschuh.net>
Date: Sat, 28 Dec 2024 09:43:43 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Michael Ellerman <mpe@...erman.id.au>, 
 Nicholas Piggin <npiggin@...il.com>, 
 Christophe Leroy <christophe.leroy@...roup.eu>, 
 Naveen N Rao <naveen@...nel.org>, Madhavan Srinivasan <maddy@...ux.ibm.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, 
 Luis Chamberlain <mcgrof@...nel.org>, Petr Pavlu <petr.pavlu@...e.com>, 
 Sami Tolvanen <samitolvanen@...gle.com>, 
 Daniel Gomez <da.gomez@...sung.com>, Alexei Starovoitov <ast@...nel.org>, 
 Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, 
 Martin KaFai Lau <martin.lau@...ux.dev>, 
 Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>, 
 Yonghong Song <yonghong.song@...ux.dev>, 
 John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>, 
 Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>, 
 Jiri Olsa <jolsa@...nel.org>
Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org, 
 linux-modules@...r.kernel.org, bpf@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH v2 3/3] btf: Switch module BTF attribute to
 sysfs_bin_attr_simple_read()

The generic function from the sysfs core can replace the custom one.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
Acked-by: Andrii Nakryiko <andrii@...nel.org>
---
 kernel/bpf/btf.c | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index e5a5f023cedd5c288c2774218862c69db469917f..76de36d2552002d1e25c826d701340d9cde07ba1 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -8011,17 +8011,6 @@ struct btf_module {
 static LIST_HEAD(btf_modules);
 static DEFINE_MUTEX(btf_module_mutex);

-static ssize_t
-btf_module_read(struct file *file, struct kobject *kobj,
-		struct bin_attribute *bin_attr,
-		char *buf, loff_t off, size_t len)
-{
-	const struct btf *btf = bin_attr->private;
-
-	memcpy(buf, btf->data + off, len);
-	return len;
-}
-
 static void purge_cand_cache(struct btf *btf);

 static int btf_module_notify(struct notifier_block *nb, unsigned long op,
@@ -8082,8 +8071,8 @@ static int btf_module_notify(struct notifier_block *nb, unsigned long op,
 			attr->attr.name = btf->name;
 			attr->attr.mode = 0444;
 			attr->size = btf->data_size;
-			attr->private = btf;
-			attr->read = btf_module_read;
+			attr->private = btf->data;
+			attr->read_new = sysfs_bin_attr_simple_read;

 			err = sysfs_create_bin_file(btf_kobj, attr);
 			if (err) {

-- 
2.47.1