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authorJohn Ogness <john.ogness@linutronix.de>2021-03-03 13:15:25 +0300
committerPetr Mladek <pmladek@suse.com>2021-03-08 13:43:27 +0300
commitf9f3f02db98bbe678a8e57fe9432b196174744a3 (patch)
treea788ed5cb2ff8ed46a25336400f2c23d6ba0a20c /kernel/debug
parent5f6c7648e556f41a3064bb6dceb9e102c50b618d (diff)
downloadlinux-f9f3f02db98bbe678a8e57fe9432b196174744a3.tar.xz
printk: introduce a kmsg_dump iterator
Rather than storing the iterator information in the registered kmsg_dumper structure, create a separate iterator structure. The kmsg_dump_iter structure can reside on the stack of the caller, thus allowing lockless use of the kmsg_dump functions. Update code that accesses the kernel logs using the kmsg_dumper structure to use the new kmsg_dump_iter structure. For kmsg_dumpers, this also means adding a call to kmsg_dump_rewind() to initialize the iterator. All this is in preparation for removal of @logbuf_lock. Signed-off-by: John Ogness <john.ogness@linutronix.de> Reviewed-by: Kees Cook <keescook@chromium.org> # pstore Reviewed-by: Petr Mladek <pmladek@suse.com> Signed-off-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/20210303101528.29901-13-john.ogness@linutronix.de
Diffstat (limited to 'kernel/debug')
-rw-r--r--kernel/debug/kdb/kdb_main.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index 315169d5e119..8544d7a55a57 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -2101,7 +2101,7 @@ static int kdb_dmesg(int argc, const char **argv)
int adjust = 0;
int n = 0;
int skip = 0;
- struct kmsg_dumper dumper;
+ struct kmsg_dump_iter iter;
size_t len;
char buf[201];
@@ -2126,8 +2126,8 @@ static int kdb_dmesg(int argc, const char **argv)
kdb_set(2, setargs);
}
- kmsg_dump_rewind_nolock(&dumper);
- while (kmsg_dump_get_line_nolock(&dumper, 1, NULL, 0, NULL))
+ kmsg_dump_rewind_nolock(&iter);
+ while (kmsg_dump_get_line_nolock(&iter, 1, NULL, 0, NULL))
n++;
if (lines < 0) {
@@ -2159,8 +2159,8 @@ static int kdb_dmesg(int argc, const char **argv)
if (skip >= n || skip < 0)
return 0;
- kmsg_dump_rewind_nolock(&dumper);
- while (kmsg_dump_get_line_nolock(&dumper, 1, buf, sizeof(buf), &len)) {
+ kmsg_dump_rewind_nolock(&iter);
+ while (kmsg_dump_get_line_nolock(&iter, 1, buf, sizeof(buf), &len)) {
if (skip) {
skip--;
continue;