mirror of
https://github.com/torvalds/linux.git
synced 2024-12-02 00:51:44 +00:00
7a16a77189
Console drivers typically must deal with access to the hardware via user input/output (such as an interactive login shell) and output of kernel messages via printk() calls. To provide the necessary synchronization, usually some driver-specific locking mechanism is used (for example, the port spinlock for uart serial consoles). Until now, usage of this driver-specific locking has been hidden from the printk-subsystem and implemented within the various console callbacks. However, nbcon consoles would need to use it even in the generic code. Add device_lock() and device_unlock() callback which will need to get implemented by nbcon consoles. The callbacks will use whatever synchronization mechanism the driver is using for itself. The minimum requirement is to prevent CPU migration. It would allow a context friendly acquiring of nbcon console ownership in non-emergency and non-panic context. Signed-off-by: John Ogness <john.ogness@linutronix.de> Reviewed-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/20240820063001.36405-9-john.ogness@linutronix.de Signed-off-by: Petr Mladek <pmladek@suse.com> |
||
|---|---|---|
| .. | ||
| acpi | ||
| asm-generic | ||
| clocksource | ||
| crypto | ||
| drm | ||
| dt-bindings | ||
| keys | ||
| kunit | ||
| kvm | ||
| linux | ||
| math-emu | ||
| media | ||
| memory | ||
| misc | ||
| net | ||
| pcmcia | ||
| ras | ||
| rdma | ||
| rv | ||
| scsi | ||
| soc | ||
| sound | ||
| target | ||
| trace | ||
| uapi | ||
| ufs | ||
| vdso | ||
| video | ||
| xen | ||