Re: [PATCH 34/50] sparc: Add show_stack_loglvl()

[David Miller]

From: Dmitry Safonov <dima@xxxxxxxxxx>
Date: Wed,  6 Nov 2019 03:05:25 +0000

> Currently, the log-level of show_stack() depends on a platform
> realization. It creates situations where the headers are printed with
> lower log level or higher than the stacktrace (depending on
> a platform or user).
> 
> Furthermore, it forces the logic decision from user to an architecture
> side. In result, some users as sysrq/kdb/etc are doing tricks with
> temporary rising console_loglevel while printing their messages.
> And in result it not only may print unwanted messages from other CPUs,
> but also omit printing at all in the unlucky case where the printk()
> was deferred.
> 
> Introducing log-level parameter and KERN_UNSUPPRESSED [1] seems
> an easier approach than introducing more printk buffers.
> Also, it will consolidate printings with headers.
> 
> Introduce show_stack_loglvl(), that eventually will substitute
> show_stack().
> 
> Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
> Cc: sparclinux@xxxxxxxxxxxxxxx
> [1]: https://lore.kernel.org/lkml/20190528002412.1625-1-dima@xxxxxxxxxx/T/#u
> Signed-off-by: Dmitry Safonov <dima@xxxxxxxxxx>

Acked-by: David S. Miller <davem@xxxxxxxxxxxxx>