Messages in this thread Patch in this message | | | Date | Fri, 9 Dec 2005 21:47:36 +0100 | From | Olaf Hering <> | Subject | Re: [PATCH] Adding ctrl-o sysrq hack support to 8250 driver |
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On Fri, Dec 09, Olaf Hering wrote:
> > If it is a POWER4-only problem, why isn't there a dependency on > > CONFIG_POWER4 over here? I don't like to have the ctrl-o sysrq stuff > > enabled on my regular PC if it only matters to some rare (in absolute > > numbers) system.
The system with the build tree on it just crashed hard. Thats what I saved from the screen session:
Index: linux-2.6.15-rc5-olh/drivers/serial/8250.c =================================================================== --- linux-2.6.15-rc5-olh.orig/drivers/serial/8250.c +++ linux-2.6.15-rc5-olh/drivers/serial/8250.c @@ -85,6 +85,8 @@ static unsigned int share_irqs = SERIAL8 #define CONFIG_SERIAL_MANY_PORTS 1 #endif
+#define arch_8250_sysrq_via_ctrl_o(x) (0) + /* * HUB6 is always on. This will be removed once the header * files have been cleaned. @@ -1154,6 +1156,10 @@ receive_chars(struct uart_8250_port *up, */ } ch = serial_inp(up, UART_RX); + + if (arch_8250_sysrq_via_ctrl_o(ch, &up->port)) + goto ignore_char; + flag = TTY_NORMAL; up->port.icount.rx++;
Index: linux-2.6.15-rc5-olh/include/asm-powerpc/serial.h =================================================================== --- linux-2.6.15-rc5-olh.orig/include/asm-powerpc/serial.h +++ linux-2.6.15-rc5-olh/include/asm-powerpc/serial.h @@ -15,4 +15,11 @@ /* Default baud base if not found in device-tree */ #define BASE_BAUD ( 1843200 / 16 )
+ +#if defined(SUPPORT_SYSRQ) && defined(CONFIG_PPC_PSERIES) + /* Handle the SysRq ^O Hack, but only on the system console */ +#undef arch_8250_sysrq_via_ctrl_o +#define arch_8250_sysrq_via_ctrl_o(ch, port) ((ch) == '\x0f' && uart_handle_break((port))) +#endif + #endif /* _PPC64_SERIAL_H */
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