linux-kernel - [PATCH 2/9] arm64: Add comment for stack_info::kr

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Message-Id: <20211117140737.44420-3-mark.rutland@arm.com>
Date:   Wed, 17 Nov 2021 14:07:30 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     aou@...s.berkeley.edu, borntraeger@...ibm.com, bp@...en8.de,
        broonie@...nel.org, catalin.marinas@....com,
        dave.hansen@...ux.intel.com, gor@...ux.ibm.com, hca@...ux.ibm.com,
        linux-kernel@...r.kernel.org, madvenka@...ux.microsoft.com,
        mark.rutland@....com, mhiramat@...nel.org, mingo@...hat.com,
        mpe@...erman.id.au, palmer@...belt.com, paul.walmsley@...ive.com,
        peterz@...radead.org, rostedt@...dmis.org, tglx@...utronix.de,
        will@...nel.org
Subject: [PATCH 2/9] arm64: Add comment for stack_info::kr_cur

We added stack_info::kr_cur in commit:

  cd9bc2c9258816dc ("arm64: Recover kretprobe modified return address in stacktrace")

... but didn't add anything in the corresponding comment block.

For consistency, add a corresponding comment.

Signed-off-by: Mark Rutland <mark.rutland@....com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Steven Rostedt (VMware) <rostedt@...dmis.org>
Cc: Will Deacon <will@...nel.org>
---
 arch/arm64/include/asm/stacktrace.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/include/asm/stacktrace.h b/arch/arm64/include/asm/stacktrace.h
index 6564a01cc085..686731b9df05 100644
--- a/arch/arm64/include/asm/stacktrace.h
+++ b/arch/arm64/include/asm/stacktrace.h
@@ -47,6 +47,10 @@ struct stack_info {
  * @prev_type:   The type of stack this frame record was on, or a synthetic
  *               value of STACK_TYPE_UNKNOWN. This is used to detect a
  *               transition from one stack to another.
+ *
+ * @kr_cur:      When KRETPOLINES is selected, holds the kretprobe instance
+ *               associated with the most recently encountered replacement lr
+ *               value.
  */
 struct stackframe {
 	unsigned long fp;
-- 
2.11.0