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x86: Always use irq stacks

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IRQ stacks provide much better safety against unexpected stack use from
interrupts, at the minimal downside of slightly higher memory usage.
Enable irq stacks also for the default 8k stack on 32-bit kernels to
minimize the problem of stack overflows through interrupt activity.

This is what the 64-bit kernel and various other architectures already do.

Signed-off-by: Christoph Hellwig <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Christoph Hellwig 2010-06-28 14:15:54 +02:00 • committed by Thomas Gleixner
commit 7974891db2
4 changed files with 9 additions and 18 deletions
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6
Documentation/x86/x86_64/kernel-stacks
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@ -18,9 +18,9 @@ specialized stacks contain no useful data. The main CPU stacks are:
Used for external hardware interrupts. If this is the first external
hardware interrupt (i.e. not a nested hardware interrupt) then the
kernel switches from the current task to the interrupt stack. Like
the split thread and interrupt stacks on i386 (with CONFIG_4KSTACKS),
this gives more room for kernel interrupt processing without having
to increase the size of every per thread stack.
the split thread and interrupt stacks on i386, this gives more room
for kernel interrupt processing without having to increase the size
of every per thread stack.
The interrupt stack is also used when processing a softirq.