diff options
Diffstat (limited to 'meta-oe/recipes-kernel/crash/crash/0002-printk-use-committed-finalized-state-values.patch')
| -rw-r--r-- | meta-oe/recipes-kernel/crash/crash/0002-printk-use-committed-finalized-state-values.patch | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/meta-oe/recipes-kernel/crash/crash/0002-printk-use-committed-finalized-state-values.patch b/meta-oe/recipes-kernel/crash/crash/0002-printk-use-committed-finalized-state-values.patch new file mode 100644 index 0000000000..5213195c7d --- /dev/null +++ b/meta-oe/recipes-kernel/crash/crash/0002-printk-use-committed-finalized-state-values.patch @@ -0,0 +1,103 @@ +From 71e159c64000467e94e08aefc144f5e1cdaa4aa0 Mon Sep 17 00:00:00 2001 +From: John Ogness <john.ogness@linutronix.de> +Date: Wed, 25 Nov 2020 05:27:53 +0106 +Subject: [PATCH 2/2] printk: use committed/finalized state values + +An addendum to the previous crash commit a5531b24750e. +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. + +Upstream-Status: Backport [https://github.com/crash-utility/crash/commit/71e159c64000467e94e08aefc144f5e1cdaa4aa0] + +Signed-off-by: John Ogness <john.ogness@linutronix.de> +Signed-off-by: Nikolay Borisov <nborisov@suse.com> +Signed-off-by: Mingli Yu <mingli.yu@windriver.com> +--- + printk.c | 48 +++++++++++++++++++++++++++++++++++++++++------- + 1 file changed, 41 insertions(+), 7 deletions(-) + +diff --git a/printk.c b/printk.c +index f6d54ce..8658016 100644 +--- a/printk.c ++++ b/printk.c +@@ -1,12 +1,6 @@ + #include "defs.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; +@@ -21,6 +15,44 @@ 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 + init_offsets(void) + { +@@ -74,6 +106,7 @@ dump_record(struct prb_map *m, unsigned long id, int msg_flags) + unsigned short text_len; + unsigned long state_var; + unsigned int caller_id; ++ enum desc_state state; + unsigned char level; + unsigned long begin; + unsigned long next; +@@ -90,7 +123,8 @@ dump_record(struct prb_map *m, unsigned long id, int msg_flags) + /* 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; + + info = m->infos + ((id % m->desc_ring_count) * SIZE(printk_info)); +-- +2.17.1 + |