On Wed 2022-11-09 10:33:55, John Ogness wrote:
> Hi Daniel,
>
> On 2022-11-09, Daniel Thompson wrote:
> >> + /*
> >> + * The console_srcu_read_lock() only provides safe console list
> >> + * traversal. The use of the ->write() callback relies on all other
> >> + * CPUs being stopped at the
On Mon 2022-11-07 15:22:10, John Ogness wrote:
> kgdboc_earlycon_init() uses the console_lock to ensure that no consoles
> are unregistered until the kgdboc_earlycon is setup. This is necessary
> because the trapping of the exit() callback assumes that the exit()
> callback is not called before the
On Mon 2022-11-07 15:22:08, John Ogness wrote:
> Replace (console->flags & CON_ENABLED) usage with console_is_enabled().
>
> Signed-off-by: John Ogness
> Reviewed-by: Petr Mladek
> Reviewed-by: Douglas Anderson
> ---
> kernel/debug/kdb/kdb_io.c | 2 +-
> 1 file changed, 1 insertion(+), 1 delet
On 2022-11-09, Daniel Thompson wrote:
>> @@ -463,9 +476,14 @@ static void kgdboc_earlycon_pre_exp_handler(void)
>> * serial drivers might be OK with this, print a warning once per
>> * boot if we detect this case.
>> */
>> -for_each_console(con)
>> +cookie = console_srcu_
Hi Daniel,
On 2022-11-09, Daniel Thompson wrote:
>> +/*
>> + * The console_srcu_read_lock() only provides safe console list
>> + * traversal. The use of the ->write() callback relies on all other
>> + * CPUs being stopped at the moment and console drivers being able to
>> + *
On Mon, Nov 07, 2022 at 03:22:34PM +0106, John Ogness wrote:
> configure_kgdboc() uses the console_lock for console list iteration. Use
> the console_list_lock instead because list synchronization responsibility
> will be removed from the console_lock in a later change.
>
> The SRCU iterator could
On Mon, Nov 07, 2022 at 03:22:13PM +0106, John Ogness wrote:
> Guarantee safe iteration of the console list by using SRCU.
>
> Signed-off-by: John Ogness
> ---
> kernel/debug/kdb/kdb_io.c | 12 +++-
> 1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/debug/kdb/kdb_io
On Mon, Nov 07, 2022 at 03:22:08PM +0106, John Ogness wrote:
> Replace (console->flags & CON_ENABLED) usage with console_is_enabled().
>
> Signed-off-by: John Ogness
> Reviewed-by: Petr Mladek
> Reviewed-by: Douglas Anderson
Reviewed-by: Daniel Thompson
Daniel.
On Mon, Nov 07, 2022 at 03:22:10PM +0106, John Ogness wrote:
> kgdboc_earlycon_init() uses the console_lock to ensure that no consoles
> are unregistered until the kgdboc_earlycon is setup. This is necessary
> because the trapping of the exit() callback assumes that the exit()
> callback is not cal
On Mon, Nov 07, 2022 at 03:22:00PM +0106, John Ogness wrote:
> From: Thomas Gleixner
>
> Unprotected list walks are not necessarily safe.
>
> Signed-off-by: Thomas Gleixner
> Signed-off-by: John Ogness
> Reviewed-by: Greg Kroah-Hartman
> Reviewed-by: Douglas Anderson
> Reviewed-by: Sergey Seno
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