On 2020-07-21, Sergey Senozhatsky <sergey.senozhat...@gmail.com> wrote: >> That said, we have traditionally used not just "current process", but >> also "last irq-level" as the context information, so I do think it >> would be good to continue to do that. > > OK, so basically, extending printk_caller_id() so that for IRQ/NMI > we will have more info than just "0x80000000 + raw_smp_processor_id()".
If bit31 is set, the upper 8 bits could specify what the lower 24 bits represent. That would give some freedom for the future. For example: 0x80 = cpu id (generic context) 0x81 = interrupt number 0x82 = cpu id (nmi context) Or maybe ascii should be used instead? 0x80 | '\0' = cpu id (generic context) 0x80 | 'i' = interrupt number 0x80 | 'n' = cpu id (nmi context) Just an idea. John Ogness
