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printk: introduce a kmsg_dump iterator

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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
This commit is contained in:
John Ogness
2021-03-03 11:15:25 +01:00
committed by Petr Mladek
parent 5f6c7648e5
commit f9f3f02db9
9 changed files with 80 additions and 62 deletions
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10
kernel/debug/kdb/kdb_main.c
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@@ -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;