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29 July 2024, 15:18:00 UTC
Revision 54321242afe6fcf8b7e589bc21ecf832bc5a206a authored by Benjamin Herrenschmidt on 13 February 2012, 20:42:18 UTC, committed by Benjamin Herrenschmidt on 16 February 2012, 05:15:10 UTC 
powerpc: Disable interrupts early in Program Check
 
Program Check exceptions are the result of WARNs, BUGs, some
type of breakpoints, kprobe, and other illegal instructions.

We want interrupts (and thus preemption) to remain disabled
while doing the initial stage of testing the reason and
branching off to a debugger or kprobe, so we are still on
the original CPU which makes debugging easier in various cases.

This is how the code was intended, hence the local_irq_enable()
right in the middle of program_check_exception().

However, the assembly exception prologue for that exception was
incorrectly marked as enabling interrupts, which defeats that
(and records a redundant enable with lockdep).

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
1 parent a1a1d1b
History
Tip revision: 54321242afe6fcf8b7e589bc21ecf832bc5a206a authored by Benjamin Herrenschmidt on 13 February 2012, 20:42:18 UTC
powerpc: Disable interrupts early in Program Check
Tip revision: 5432124
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