alpha: add ARCH_STACKWALK-based stacktrace support

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Implement arch_stack_walk() for Alpha using a simple kernel
stack scanning walker. Start from regs+1 for current tasks
to skip pt_regs and use pcb.ksp for blocked tasks. Filter
candidates with __kernel_text_address() and stop at stack
bounds via kstack_end().

Enable CONFIG_STACKTRACE_SUPPORT and CONFIG_ARCH_STACKWALK
so generic stacktrace users (dump_stack(), /proc/*/stack,
SysRq backtraces, etc.) work on Alpha.

This provides functional in-kernel stack traces without
requiring frame pointer unwinding.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Tested-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Magnus Lindholm <linmag7@gmail.com>
Link: https://lore.kernel.org/r/20260706170019.2941459-3-linmag7@gmail.com
Signed-off-by: Magnus Lindholm <linmag7@gmail.com>

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This commit is contained in:

Magnus Lindholm 2026-07-06 18:56:43 +02:00

parent 8a2857bc2b

commit 46651c650f

4 changed files with 69 additions and 1 deletions

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4

arch/alpha/Kconfig

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3

arch/alpha/kernel/Makefile

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61

arch/alpha/kernel/stacktrace.c

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2

arch/alpha/kernel/vmlinux.lds.S

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