Paul Mackerras wrote:
Linus Torvalds writes:
4kB used to be the _only_ choice. And no, there weren't even irq stacks.
So that 4kB was not just the whole kernel call-chain, it was also all the
irq nesting above it.
I think your memory is failing you. In 2.4 and earlier, the kernel
stack was 8kB minus the size of the task_struct, which sat at the
start of the 8kB. For instance, from include/asm-i386/processor.h for
2.4.29:
but was shared with interrupts; so out of the 6Kb left, you had still really only 4Kb for user context stack
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