All of lore.kernel.org
 help / color / mirror / Atom feed
From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Guo Ren <guoren@kernel.org>,
	"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
	Helge Deller <deller@gmx.de>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Heiko Carstens <hca@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Christian Borntraeger <borntraeger@de.ibm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bp@alien8.de>,
	x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
	"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>,
	"David S. Miller" <davem@davemloft.net>,
	linux-csky@vger.kernel.org, linux-parisc@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org
Subject: [PATCH 5/9] kprobes/ftrace: Add recursion protection to the ftrace callback
Date: Wed, 28 Oct 2020 07:52:49 -0400	[thread overview]
Message-ID: <20201028115613.140212174@goodmis.org> (raw)
In-Reply-To: 20201028115244.995788961@goodmis.org

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

If a ftrace callback does not supply its own recursion protection and
does not set the RECURSION_SAFE flag in its ftrace_ops, then ftrace will
make a helper trampoline to do so before calling the callback instead of
just calling the callback directly.

The default for ftrace_ops is going to assume recursion protection unless
otherwise specified.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Guo Ren <guoren@kernel.org>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: x86@kernel.org
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-csky@vger.kernel.org
Cc: linux-parisc@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-s390@vger.kernel.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 arch/csky/kernel/probes/ftrace.c     | 12 ++++++++++--
 arch/parisc/kernel/ftrace.c          | 13 +++++++++++--
 arch/powerpc/kernel/kprobes-ftrace.c | 11 ++++++++++-
 arch/s390/kernel/ftrace.c            | 13 +++++++++++--
 arch/x86/kernel/kprobes/ftrace.c     | 12 ++++++++++--
 5 files changed, 52 insertions(+), 9 deletions(-)

diff --git a/arch/csky/kernel/probes/ftrace.c b/arch/csky/kernel/probes/ftrace.c
index 5264763d05be..5eb2604fdf71 100644
--- a/arch/csky/kernel/probes/ftrace.c
+++ b/arch/csky/kernel/probes/ftrace.c
@@ -13,16 +13,21 @@ int arch_check_ftrace_location(struct kprobe *p)
 void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 			   struct ftrace_ops *ops, struct pt_regs *regs)
 {
+	int bit;
 	bool lr_saver = false;
 	struct kprobe *p;
 	struct kprobe_ctlblk *kcb;
 
-	/* Preempt is disabled by ftrace */
+	bit = ftrace_test_recursion_trylock();
+	if (bit < 0)
+		return;
+
+	preempt_disable_notrace();
 	p = get_kprobe((kprobe_opcode_t *)ip);
 	if (!p) {
 		p = get_kprobe((kprobe_opcode_t *)(ip - MCOUNT_INSN_SIZE));
 		if (unlikely(!p) || kprobe_disabled(p))
-			return;
+			goto out;
 		lr_saver = true;
 	}
 
@@ -56,6 +61,9 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 		 */
 		__this_cpu_write(current_kprobe, NULL);
 	}
+out:
+	preempt_enable_notrace();
+	ftrace_test_recursion_unlock(bit);
 }
 NOKPROBE_SYMBOL(kprobe_ftrace_handler);
 
diff --git a/arch/parisc/kernel/ftrace.c b/arch/parisc/kernel/ftrace.c
index 4bab21c71055..5f7742b225a5 100644
--- a/arch/parisc/kernel/ftrace.c
+++ b/arch/parisc/kernel/ftrace.c
@@ -208,13 +208,19 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 {
 	struct kprobe_ctlblk *kcb;
 	struct kprobe *p = get_kprobe((kprobe_opcode_t *)ip);
+	int bit;
 
-	if (unlikely(!p) || kprobe_disabled(p))
+	bit = ftrace_test_recursion_trylock();
+	if (bit < 0)
 		return;
 
+	preempt_disable_notrace();
+	if (unlikely(!p) || kprobe_disabled(p))
+		goto out;
+
 	if (kprobe_running()) {
 		kprobes_inc_nmissed_count(p);
-		return;
+		goto out;
 	}
 
 	__this_cpu_write(current_kprobe, p);
@@ -235,6 +241,9 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 		}
 	}
 	__this_cpu_write(current_kprobe, NULL);
+out:
+	preempt_enable_notrace();
+	ftrace_test_recursion_unlock(bit);
 }
 NOKPROBE_SYMBOL(kprobe_ftrace_handler);
 
diff --git a/arch/powerpc/kernel/kprobes-ftrace.c b/arch/powerpc/kernel/kprobes-ftrace.c
index 972cb28174b2..5df8d50c65ae 100644
--- a/arch/powerpc/kernel/kprobes-ftrace.c
+++ b/arch/powerpc/kernel/kprobes-ftrace.c
@@ -18,10 +18,16 @@ void kprobe_ftrace_handler(unsigned long nip, unsigned long parent_nip,
 {
 	struct kprobe *p;
 	struct kprobe_ctlblk *kcb;
+	int bit;
 
+	bit = ftrace_test_recursion_trylock();
+	if (bit < 0)
+		return;
+
+	preempt_disable_notrace();
 	p = get_kprobe((kprobe_opcode_t *)nip);
 	if (unlikely(!p) || kprobe_disabled(p))
-		return;
+		goto out;
 
 	kcb = get_kprobe_ctlblk();
 	if (kprobe_running()) {
@@ -52,6 +58,9 @@ void kprobe_ftrace_handler(unsigned long nip, unsigned long parent_nip,
 		 */
 		__this_cpu_write(current_kprobe, NULL);
 	}
+out:
+	preempt_enable_notrace();
+	ftrace_test_recursion_unlock(bit);
 }
 NOKPROBE_SYMBOL(kprobe_ftrace_handler);
 
diff --git a/arch/s390/kernel/ftrace.c b/arch/s390/kernel/ftrace.c
index b388e87a08bf..88466d7fb6b2 100644
--- a/arch/s390/kernel/ftrace.c
+++ b/arch/s390/kernel/ftrace.c
@@ -202,13 +202,19 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 {
 	struct kprobe_ctlblk *kcb;
 	struct kprobe *p = get_kprobe((kprobe_opcode_t *)ip);
+	int bit;
 
-	if (unlikely(!p) || kprobe_disabled(p))
+	bit = ftrace_test_recursion_trylock();
+	if (bit < 0)
 		return;
 
+	preempt_disable_notrace();
+	if (unlikely(!p) || kprobe_disabled(p))
+		goto out;
+
 	if (kprobe_running()) {
 		kprobes_inc_nmissed_count(p);
-		return;
+		goto out;
 	}
 
 	__this_cpu_write(current_kprobe, p);
@@ -228,6 +234,9 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 		}
 	}
 	__this_cpu_write(current_kprobe, NULL);
+out:
+	preempt_enable_notrace();
+	ftrace_test_recursion_unlock(bit);
 }
 NOKPROBE_SYMBOL(kprobe_ftrace_handler);
 
diff --git a/arch/x86/kernel/kprobes/ftrace.c b/arch/x86/kernel/kprobes/ftrace.c
index 681a4b36e9bb..a40a6cdfcca3 100644
--- a/arch/x86/kernel/kprobes/ftrace.c
+++ b/arch/x86/kernel/kprobes/ftrace.c
@@ -18,11 +18,16 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 {
 	struct kprobe *p;
 	struct kprobe_ctlblk *kcb;
+	int bit;
 
-	/* Preempt is disabled by ftrace */
+	bit = ftrace_test_recursion_trylock();
+	if (bit < 0)
+		return;
+
+	preempt_disable_notrace();
 	p = get_kprobe((kprobe_opcode_t *)ip);
 	if (unlikely(!p) || kprobe_disabled(p))
-		return;
+		goto out;
 
 	kcb = get_kprobe_ctlblk();
 	if (kprobe_running()) {
@@ -52,6 +57,9 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 		 */
 		__this_cpu_write(current_kprobe, NULL);
 	}
+out:
+	preempt_enable_notrace();
+	ftrace_test_recursion_unlock(bit);
 }
 NOKPROBE_SYMBOL(kprobe_ftrace_handler);
 
-- 
2.28.0



WARNING: multiple messages have this Message-ID
From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
	Guo Ren <guoren@kernel.org>,
	linux-csky@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
	linux-s390@vger.kernel.org, Helge Deller <deller@gmx.de>,
	x86@kernel.org,
	Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>,
	Christian Borntraeger <borntraeger@de.ibm.com>,
	"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Heiko Carstens <hca@linux.ibm.com>,
	Borislav Petkov <bp@alien8.de>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-parisc@vger.kernel.org,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Paul Mackerras <paulus@samba.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	linuxppc-dev@lists.ozlabs.org,
	"David S. Miller" <davem@davemloft.net>
Subject: [PATCH 5/9] kprobes/ftrace: Add recursion protection to the ftrace callback
Date: Wed, 28 Oct 2020 07:52:49 -0400	[thread overview]
Message-ID: <20201028115613.140212174@goodmis.org> (raw)
In-Reply-To: 20201028115244.995788961@goodmis.org

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

If a ftrace callback does not supply its own recursion protection and
does not set the RECURSION_SAFE flag in its ftrace_ops, then ftrace will
make a helper trampoline to do so before calling the callback instead of
just calling the callback directly.

The default for ftrace_ops is going to assume recursion protection unless
otherwise specified.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Guo Ren <guoren@kernel.org>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: x86@kernel.org
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-csky@vger.kernel.org
Cc: linux-parisc@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-s390@vger.kernel.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 arch/csky/kernel/probes/ftrace.c     | 12 ++++++++++--
 arch/parisc/kernel/ftrace.c          | 13 +++++++++++--
 arch/powerpc/kernel/kprobes-ftrace.c | 11 ++++++++++-
 arch/s390/kernel/ftrace.c            | 13 +++++++++++--
 arch/x86/kernel/kprobes/ftrace.c     | 12 ++++++++++--
 5 files changed, 52 insertions(+), 9 deletions(-)

diff --git a/arch/csky/kernel/probes/ftrace.c b/arch/csky/kernel/probes/ftrace.c
index 5264763d05be..5eb2604fdf71 100644
--- a/arch/csky/kernel/probes/ftrace.c
+++ b/arch/csky/kernel/probes/ftrace.c
@@ -13,16 +13,21 @@ int arch_check_ftrace_location(struct kprobe *p)
 void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 			   struct ftrace_ops *ops, struct pt_regs *regs)
 {
+	int bit;
 	bool lr_saver = false;
 	struct kprobe *p;
 	struct kprobe_ctlblk *kcb;
 
-	/* Preempt is disabled by ftrace */
+	bit = ftrace_test_recursion_trylock();
+	if (bit < 0)
+		return;
+
+	preempt_disable_notrace();
 	p = get_kprobe((kprobe_opcode_t *)ip);
 	if (!p) {
 		p = get_kprobe((kprobe_opcode_t *)(ip - MCOUNT_INSN_SIZE));
 		if (unlikely(!p) || kprobe_disabled(p))
-			return;
+			goto out;
 		lr_saver = true;
 	}
 
@@ -56,6 +61,9 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 		 */
 		__this_cpu_write(current_kprobe, NULL);
 	}
+out:
+	preempt_enable_notrace();
+	ftrace_test_recursion_unlock(bit);
 }
 NOKPROBE_SYMBOL(kprobe_ftrace_handler);
 
diff --git a/arch/parisc/kernel/ftrace.c b/arch/parisc/kernel/ftrace.c
index 4bab21c71055..5f7742b225a5 100644
--- a/arch/parisc/kernel/ftrace.c
+++ b/arch/parisc/kernel/ftrace.c
@@ -208,13 +208,19 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 {
 	struct kprobe_ctlblk *kcb;
 	struct kprobe *p = get_kprobe((kprobe_opcode_t *)ip);
+	int bit;
 
-	if (unlikely(!p) || kprobe_disabled(p))
+	bit = ftrace_test_recursion_trylock();
+	if (bit < 0)
 		return;
 
+	preempt_disable_notrace();
+	if (unlikely(!p) || kprobe_disabled(p))
+		goto out;
+
 	if (kprobe_running()) {
 		kprobes_inc_nmissed_count(p);
-		return;
+		goto out;
 	}
 
 	__this_cpu_write(current_kprobe, p);
@@ -235,6 +241,9 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 		}
 	}
 	__this_cpu_write(current_kprobe, NULL);
+out:
+	preempt_enable_notrace();
+	ftrace_test_recursion_unlock(bit);
 }
 NOKPROBE_SYMBOL(kprobe_ftrace_handler);
 
diff --git a/arch/powerpc/kernel/kprobes-ftrace.c b/arch/powerpc/kernel/kprobes-ftrace.c
index 972cb28174b2..5df8d50c65ae 100644
--- a/arch/powerpc/kernel/kprobes-ftrace.c
+++ b/arch/powerpc/kernel/kprobes-ftrace.c
@@ -18,10 +18,16 @@ void kprobe_ftrace_handler(unsigned long nip, unsigned long parent_nip,
 {
 	struct kprobe *p;
 	struct kprobe_ctlblk *kcb;
+	int bit;
 
+	bit = ftrace_test_recursion_trylock();
+	if (bit < 0)
+		return;
+
+	preempt_disable_notrace();
 	p = get_kprobe((kprobe_opcode_t *)nip);
 	if (unlikely(!p) || kprobe_disabled(p))
-		return;
+		goto out;
 
 	kcb = get_kprobe_ctlblk();
 	if (kprobe_running()) {
@@ -52,6 +58,9 @@ void kprobe_ftrace_handler(unsigned long nip, unsigned long parent_nip,
 		 */
 		__this_cpu_write(current_kprobe, NULL);
 	}
+out:
+	preempt_enable_notrace();
+	ftrace_test_recursion_unlock(bit);
 }
 NOKPROBE_SYMBOL(kprobe_ftrace_handler);
 
diff --git a/arch/s390/kernel/ftrace.c b/arch/s390/kernel/ftrace.c
index b388e87a08bf..88466d7fb6b2 100644
--- a/arch/s390/kernel/ftrace.c
+++ b/arch/s390/kernel/ftrace.c
@@ -202,13 +202,19 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 {
 	struct kprobe_ctlblk *kcb;
 	struct kprobe *p = get_kprobe((kprobe_opcode_t *)ip);
+	int bit;
 
-	if (unlikely(!p) || kprobe_disabled(p))
+	bit = ftrace_test_recursion_trylock();
+	if (bit < 0)
 		return;
 
+	preempt_disable_notrace();
+	if (unlikely(!p) || kprobe_disabled(p))
+		goto out;
+
 	if (kprobe_running()) {
 		kprobes_inc_nmissed_count(p);
-		return;
+		goto out;
 	}
 
 	__this_cpu_write(current_kprobe, p);
@@ -228,6 +234,9 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 		}
 	}
 	__this_cpu_write(current_kprobe, NULL);
+out:
+	preempt_enable_notrace();
+	ftrace_test_recursion_unlock(bit);
 }
 NOKPROBE_SYMBOL(kprobe_ftrace_handler);
 
diff --git a/arch/x86/kernel/kprobes/ftrace.c b/arch/x86/kernel/kprobes/ftrace.c
index 681a4b36e9bb..a40a6cdfcca3 100644
--- a/arch/x86/kernel/kprobes/ftrace.c
+++ b/arch/x86/kernel/kprobes/ftrace.c
@@ -18,11 +18,16 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 {
 	struct kprobe *p;
 	struct kprobe_ctlblk *kcb;
+	int bit;
 
-	/* Preempt is disabled by ftrace */
+	bit = ftrace_test_recursion_trylock();
+	if (bit < 0)
+		return;
+
+	preempt_disable_notrace();
 	p = get_kprobe((kprobe_opcode_t *)ip);
 	if (unlikely(!p) || kprobe_disabled(p))
-		return;
+		goto out;
 
 	kcb = get_kprobe_ctlblk();
 	if (kprobe_running()) {
@@ -52,6 +57,9 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 		 */
 		__this_cpu_write(current_kprobe, NULL);
 	}
+out:
+	preempt_enable_notrace();
+	ftrace_test_recursion_unlock(bit);
 }
 NOKPROBE_SYMBOL(kprobe_ftrace_handler);
 
-- 
2.28.0



  parent reply	other threads:[~2020-10-29  0:53 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-28 11:52 [PATCH 0/9] ftrace: Have callbacks handle their own recursion Steven Rostedt
2020-10-28 11:52 ` [PATCH 1/9] ftrace: Move the recursion testing into global headers Steven Rostedt
2020-10-30  9:13   ` Miroslav Benes
2020-10-30 12:30     ` Steven Rostedt
2020-10-28 11:52 ` [PATCH 2/9] ftrace: Add ftrace_test_recursion_trylock() helper function Steven Rostedt
2020-10-28 11:52 ` [PATCH 3/9] ftrace: Optimize testing what context current is in Steven Rostedt
2020-10-28 11:52 ` [PATCH 4/9] pstore/ftrace: Add recursion protection to the ftrace callback Steven Rostedt
2020-10-28 15:59   ` Kees Cook
2020-10-28 11:52 ` Steven Rostedt [this message]
2020-10-28 11:52   ` [PATCH 5/9] kprobes/ftrace: " Steven Rostedt
2020-10-29  7:58   ` Masami Hiramatsu
2020-10-29  7:58     ` Masami Hiramatsu
2020-10-29 13:40     ` Steven Rostedt
2020-10-29 13:40       ` Steven Rostedt
2020-11-02  5:08       ` Masami Hiramatsu
2020-11-02  5:08         ` Masami Hiramatsu
2020-10-28 11:52 ` [PATCH 6/9] livepatch/ftrace: " Steven Rostedt
2020-10-29 13:51   ` Miroslav Benes
2020-10-29 14:37     ` Steven Rostedt
2020-10-30 12:28       ` Steven Rostedt
2020-10-29 14:57     ` Petr Mladek
2020-10-29 15:03       ` Miroslav Benes
2020-10-29 18:24       ` Steven Rostedt
2020-10-30  9:48         ` Miroslav Benes
2020-10-30 10:41           ` Petr Mladek
2020-10-28 11:52 ` [PATCH 7/9] perf/ftrace: " Steven Rostedt
2020-10-28 11:52 ` [PATCH 8/9] perf/ftrace: Check for rcu_is_watching() in callback function Steven Rostedt
2020-10-28 11:52 ` [PATCH 9/9] ftrace: Reverse what the RECURSION flag means in the ftrace_ops Steven Rostedt

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=20201028115613.140212174@goodmis.org \
    --to=rostedt@goodmis.org \
    --cc=James.Bottomley@HansenPartnership.com \
    --cc=akpm@linux-foundation.org \
    --cc=anil.s.keshavamurthy@intel.com \
    --cc=benh@kernel.crashing.org \
    --cc=borntraeger@de.ibm.com \
    --cc=bp@alien8.de \
    --cc=davem@davemloft.net \
    --cc=deller@gmx.de \
    --cc=gor@linux.ibm.com \
    --cc=guoren@kernel.org \
    --cc=hca@linux.ibm.com \
    --cc=hpa@zytor.com \
    --cc=linux-csky@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-parisc@vger.kernel.org \
    --cc=linux-s390@vger.kernel.org \
    --cc=linuxppc-dev@lists.ozlabs.org \
    --cc=mhiramat@kernel.org \
    --cc=mpe@ellerman.id.au \
    --cc=naveen.n.rao@linux.ibm.com \
    --cc=paulus@samba.org \
    --cc=tglx@linutronix.de \
    --cc=x86@kernel.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.