ist_enter

Name:In IST context, we explicitly disable preemption. This serves two* purposes: it makes it much less likely that we would accidentally* schedule in IST context and it will force a warning if we somehow* manage to schedule by accident.

Proto:void ist_enter(struct pt_regs *regs)

Type:void

Parameter:

Type	Parameter	Name
struct pt_regs *	regs

**Caller**
Name	Describe
do_double_fault	Runs on an IST stack for x86_64 and on a special task stack for x86_32.* On x86_64, this is more or less a normal kernel entry. Notwithstanding the* SDM's warnings about double faults being unrecoverable, returning works as* expected
do_int3
do_debug	Our handling of the processor debug registers is non-trivial.* We do not clear them on entry and exit from the kernel. Therefore* it is possible to get a watchpoint trap here from inside the kernel.* However, the code in
do_machine_check	The actual machine check handler. This only handles real* exceptions when something got corrupted coming in through int 18.* This is executed in NMI context not subject to normal locking rules. This* implies that most kernel services cannot be safely used
winchip_machine_check	Machine check handler for WinChip C6:
pentium_machine_check	Machine check handler for Pentium class Intel CPUs:

Function report