linuxppc-dev.lists.ozlabs.org archive mirror
 help / color / mirror / Atom feed
From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
To: Michael Ellerman <mpe@ellerman.id.au>,
	Steven Rostedt <rostedt@goodmis.org>
Cc: linuxppc-dev@lists.ozlabs.org, Paul Mackerras <paulus@ozlabs.org>,
	Nicholas Piggin <npiggin@gmail.com>,
	Anton Blanchard <anton@samba.org>,
	sathnaga@linux.vnet.ibm.com
Subject: [PATCH v4 04/10] powerpc64/ftrace: Add helpers to hard disable ftrace
Date: Wed,  4 Apr 2018 01:42:19 +0530	[thread overview]
Message-ID: <dabb5a3c81b55b9b4f755faa7ace9e0f2d9a7dfc.1522784883.git.naveen.n.rao@linux.vnet.ibm.com> (raw)
In-Reply-To: <cover.1522784883.git.naveen.n.rao@linux.vnet.ibm.com>
In-Reply-To: <cover.1522784883.git.naveen.n.rao@linux.vnet.ibm.com>

Add some helpers to enable/disable ftrace through paca->ftrace_enabled.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/ftrace.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h
index ebfc0b846bb5..3b5e85a72e10 100644
--- a/arch/powerpc/include/asm/ftrace.h
+++ b/arch/powerpc/include/asm/ftrace.h
@@ -82,6 +82,23 @@ static inline bool arch_syscall_match_sym_name(const char *sym, const char *name
 	return !strcmp(sym + 4, name + 3);
 }
 #endif /* CONFIG_FTRACE_SYSCALLS && PPC64_ELF_ABI_v1 */
+
+#ifdef CONFIG_PPC64
+#include <asm/paca.h>
+
+static inline void this_cpu_disable_ftrace(void)
+{
+	get_paca()->ftrace_enabled = 0;
+}
+
+static inline void this_cpu_enable_ftrace(void)
+{
+	get_paca()->ftrace_enabled = 1;
+}
+#else /* CONFIG_PPC64 */
+static inline void this_cpu_disable_ftrace(void) { }
+static inline void this_cpu_enable_ftrace(void) { }
+#endif /* CONFIG_PPC64 */
 #endif /* !__ASSEMBLY__ */
 
 #endif /* _ASM_POWERPC_FTRACE */
-- 
2.16.2

  parent reply	other threads:[~2018-04-03 20:13 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-03 20:12 [PATCH v4 00/10] powerpc64/ftrace: Add support for ftrace_modify_call() and a few other fixes Naveen N. Rao
2018-04-03 20:12 ` [PATCH v4 01/10] powerpc64/ftrace: Add a field in paca to disable ftrace in unsafe code paths Naveen N. Rao
2018-04-03 20:12 ` [PATCH v4 02/10] powerpc64/ftrace: Disable ftrace during kvm guest entry/exit Naveen N. Rao
2018-04-03 20:12 ` [PATCH v4 03/10] powerpc64/ftrace: Rearrange #ifdef sections in ftrace.h Naveen N. Rao
2018-04-03 20:12 ` Naveen N. Rao [this message]
2018-04-03 20:12 ` [PATCH v4 05/10] powerpc64/ftrace: Delay enabling ftrace on secondary cpus Naveen N. Rao
2018-04-03 20:12 ` [PATCH v4 06/10] powerpc64/ftrace: Disable ftrace during hotplug Naveen N. Rao
2018-04-03 20:12 ` [PATCH v4 07/10] powerpc64/kexec: Hard disable ftrace before switching to the new kernel Naveen N. Rao
2018-04-03 20:12 ` [PATCH v4 08/10] powerpc64/module: Tighten detection of mcount call sites with -mprofile-kernel Naveen N. Rao
2018-04-03 20:12 ` [PATCH v4 09/10] powerpc64/ftrace: Use the generic version of ftrace_replace_code() Naveen N. Rao
2018-04-03 20:12 ` [PATCH v4 10/10] powerpc64/ftrace: Implement support for ftrace_regs_caller() 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=dabb5a3c81b55b9b4f755faa7ace9e0f2d9a7dfc.1522784883.git.naveen.n.rao@linux.vnet.ibm.com \
    --to=naveen.n.rao@linux.vnet.ibm.com \
    --cc=anton@samba.org \
    --cc=linuxppc-dev@lists.ozlabs.org \
    --cc=mpe@ellerman.id.au \
    --cc=npiggin@gmail.com \
    --cc=paulus@ozlabs.org \
    --cc=rostedt@goodmis.org \
    --cc=sathnaga@linux.vnet.ibm.com \
    /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).