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xen-devel
Re: [Xen-devel] [PATCH] cdb: split cdb into arch independet/dependet par
On 13 Jan 2006, at 15:46, Hollis Blanchard wrote:
+ /* Try to make things a little more stable by disabling
+ interrupts while we're here. */
+ local_irq_save(flags);
...
+ local_irq_restore(flags);
Shouldn't we enter __trap_to_gdb with interrupts disabled already?
That's how it's done on PPC, I believe x86 can choose in the IDT, and
I'm sure IA64 can too?
That's true if it's a hardware-generated trap to debugger. Breakpoint
exceptions, manual calls to trap into the debugger, etc all might enter
the stub with ints enabled. So irqsave/restore is a reasonable
safeguard.
Hmm, actually, how does this interact with interrupt-driven ns16550?
The serial subsystem supports a synchronous polled mode of operation.
You can put a COM port in polled mode by calling serial_start_sync().
-- Keir
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