From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
To: Steven Rostedt <rostedt@goodmis.org>,
Michael Ellerman <mpe@ellerman.id.au>
Cc: <linux-kernel@vger.kernel.org>, <linuxppc-dev@lists.ozlabs.org>
Subject: [RFC PATCH 03/14] ftrace: Fix cleanup in error path of register_ftrace_direct()
Date: Thu, 26 Nov 2020 23:38:40 +0530 [thread overview]
Message-ID: <5a10d77b845633fbd13f1c3c71e7f9777bbbe601.1606412433.git.naveen.n.rao@linux.vnet.ibm.com> (raw)
In-Reply-To: <cover.1606412433.git.naveen.n.rao@linux.vnet.ibm.com>
We need to remove hash entry if register_ftrace_function() fails.
Consolidate the cleanup to be done after register_ftrace_function() at
the end.
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
---
kernel/trace/ftrace.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 9c1bba8cc51b03..3844a4a1346a9c 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -5136,8 +5136,6 @@ int register_ftrace_direct(unsigned long ip, unsigned long addr)
__add_hash_entry(direct_functions, entry);
ret = ftrace_set_filter_ip(&direct_ops, ip, 0, 0);
- if (ret)
- remove_hash_entry(direct_functions, entry);
if (!ret && !(direct_ops.flags & FTRACE_OPS_FL_ENABLED)) {
ret = register_ftrace_function(&direct_ops);
@@ -5146,6 +5144,7 @@ int register_ftrace_direct(unsigned long ip, unsigned long addr)
}
if (ret) {
+ remove_hash_entry(direct_functions, entry);
kfree(entry);
if (!direct->count) {
list_del_rcu(&direct->next);
--
2.25.4
next prev parent reply other threads:[~2020-11-26 18:10 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-26 18:08 [RFC PATCH 00/14] powerpc64: Add support for ftrace direct calls Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 01/14] ftrace: Fix updating FTRACE_FL_TRAMP Naveen N. Rao
2020-12-01 2:23 ` Steven Rostedt
2020-12-01 13:46 ` Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 02/14] ftrace: Fix DYNAMIC_FTRACE_WITH_DIRECT_CALLS dependency Naveen N. Rao
2020-12-01 2:36 ` Steven Rostedt
2020-11-26 18:08 ` Naveen N. Rao [this message]
2020-12-01 2:36 ` [RFC PATCH 03/14] ftrace: Fix cleanup in error path of register_ftrace_direct() Steven Rostedt
2020-11-26 18:08 ` [RFC PATCH 04/14] ftrace: Remove ftrace_find_direct_func() Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 05/14] ftrace: Add architectural helpers for [un]register_ftrace_direct() Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 06/14] powerpc: Add support for CONFIG_HAVE_FUNCTION_ARG_ACCESS_API Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 07/14] powerpc/ftrace: Remove dead code Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 08/14] powerpc/ftrace: Use FTRACE_REGS_ADDR to identify the correct ftrace trampoline Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 09/14] powerpc/ftrace: Use a hash table for tracking ftrace stubs Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 10/14] powerpc/ftrace: Drop assumptions about ftrace trampoline target Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 11/14] powerpc/ftrace: Use GPR save/restore macros in ftrace_graph_caller() Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 12/14] powerpc/ftrace: Drop saving LR to stack save area for -mprofile-kernel Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 13/14] powerpc/ftrace: Add support for register_ftrace_direct() for MPROFILE_KERNEL Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 14/14] samples/ftrace: Add powerpc support for ftrace direct samples Naveen N. Rao
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5a10d77b845633fbd13f1c3c71e7f9777bbbe601.1606412433.git.naveen.n.rao@linux.vnet.ibm.com \
--to=naveen.n.rao@linux.vnet.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mpe@ellerman.id.au \
--cc=rostedt@goodmis.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).