1d5d39f3d4
commit 44b073b7ec467aee0d7de381d455b8ace1199184
Author: John Ogness <john.ogness@linutronix.de>
Date: Wed Nov 25 10:10:31 2020 +0106
[PATCH 2/2] printk: use committed/finalized state values
* Required for kernel 5.10
The ringbuffer entries use 2 state values (committed and finalized)
rather than a single flag to represent being available for reading.
Copy the definitions and state lookup function directly from the
kernel source and use the new states.
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Kairui Song <kasong@redhat.com>
100 lines
3.1 KiB
Diff
100 lines
3.1 KiB
Diff
From 44b073b7ec467aee0d7de381d455b8ace1199184 Mon Sep 17 00:00:00 2001
|
|
From: John Ogness <john.ogness@linutronix.de>
|
|
Date: Wed, 25 Nov 2020 10:10:31 +0106
|
|
Subject: [PATCH 2/2] [PATCH 2/2] printk: use committed/finalized state values
|
|
|
|
* Required for kernel 5.10
|
|
|
|
The ringbuffer entries use 2 state values (committed and finalized)
|
|
rather than a single flag to represent being available for reading.
|
|
Copy the definitions and state lookup function directly from the
|
|
kernel source and use the new states.
|
|
|
|
Signed-off-by: John Ogness <john.ogness@linutronix.de>
|
|
---
|
|
printk.c | 48 +++++++++++++++++++++++++++++++++++++++++-------
|
|
1 file changed, 41 insertions(+), 7 deletions(-)
|
|
|
|
diff --git a/makedumpfile-1.6.8/printk.c b/makedumpfile-1.6.8/printk.c
|
|
index acffb6c..2af8562 100644
|
|
--- a/makedumpfile-1.6.8/printk.c
|
|
+++ b/makedumpfile-1.6.8/printk.c
|
|
@@ -1,12 +1,6 @@
|
|
#include "makedumpfile.h"
|
|
#include <ctype.h>
|
|
|
|
-#define DESC_SV_BITS (sizeof(unsigned long) * 8)
|
|
-#define DESC_COMMITTED_MASK (1UL << (DESC_SV_BITS - 1))
|
|
-#define DESC_REUSE_MASK (1UL << (DESC_SV_BITS - 2))
|
|
-#define DESC_FLAGS_MASK (DESC_COMMITTED_MASK | DESC_REUSE_MASK)
|
|
-#define DESC_ID_MASK (~DESC_FLAGS_MASK)
|
|
-
|
|
/* convenience struct for passing many values to helper functions */
|
|
struct prb_map {
|
|
char *prb;
|
|
@@ -21,12 +15,51 @@ struct prb_map {
|
|
char *text_data;
|
|
};
|
|
|
|
+/*
|
|
+ * desc_state and DESC_* definitions taken from kernel source:
|
|
+ *
|
|
+ * kernel/printk/printk_ringbuffer.h
|
|
+ */
|
|
+
|
|
+/* The possible responses of a descriptor state-query. */
|
|
+enum desc_state {
|
|
+ desc_miss = -1, /* ID mismatch (pseudo state) */
|
|
+ desc_reserved = 0x0, /* reserved, in use by writer */
|
|
+ desc_committed = 0x1, /* committed by writer, could get reopened */
|
|
+ desc_finalized = 0x2, /* committed, no further modification allowed */
|
|
+ desc_reusable = 0x3, /* free, not yet used by any writer */
|
|
+};
|
|
+
|
|
+#define DESC_SV_BITS (sizeof(unsigned long) * 8)
|
|
+#define DESC_FLAGS_SHIFT (DESC_SV_BITS - 2)
|
|
+#define DESC_FLAGS_MASK (3UL << DESC_FLAGS_SHIFT)
|
|
+#define DESC_STATE(sv) (3UL & (sv >> DESC_FLAGS_SHIFT))
|
|
+#define DESC_ID_MASK (~DESC_FLAGS_MASK)
|
|
+#define DESC_ID(sv) ((sv) & DESC_ID_MASK)
|
|
+
|
|
+/*
|
|
+ * get_desc_state() taken from kernel source:
|
|
+ *
|
|
+ * kernel/printk/printk_ringbuffer.c
|
|
+ */
|
|
+
|
|
+/* Query the state of a descriptor. */
|
|
+static enum desc_state get_desc_state(unsigned long id,
|
|
+ unsigned long state_val)
|
|
+{
|
|
+ if (id != DESC_ID(state_val))
|
|
+ return desc_miss;
|
|
+
|
|
+ return DESC_STATE(state_val);
|
|
+}
|
|
+
|
|
static void
|
|
dump_record(struct prb_map *m, unsigned long id)
|
|
{
|
|
unsigned long long ts_nsec;
|
|
unsigned long state_var;
|
|
unsigned short text_len;
|
|
+ enum desc_state state;
|
|
unsigned long begin;
|
|
unsigned long next;
|
|
char buf[BUFSIZE];
|
|
@@ -45,7 +78,8 @@ dump_record(struct prb_map *m, unsigned long id)
|
|
|
|
/* skip non-committed record */
|
|
state_var = ULONG(desc + OFFSET(prb_desc.state_var) + OFFSET(atomic_long_t.counter));
|
|
- if ((state_var & DESC_FLAGS_MASK) != DESC_COMMITTED_MASK)
|
|
+ state = get_desc_state(id, state_var);
|
|
+ if (state != desc_committed && state != desc_finalized)
|
|
return;
|
|
|
|
begin = ULONG(desc + OFFSET(prb_desc.text_blk_lpos) + OFFSET(prb_data_blk_lpos.begin)) %
|
|
--
|
|
2.29.2
|
|
|