Re: [PATCH 3/7] dump_stack: consolidate dump_stack() implementationsand unify their behaviors

From: Chris Metcalf
Date: Fri Apr 12 2013 - 16:39:11 EST

On 4/3/2013 3:14 PM, Tejun Heo wrote:
> This patch expands the dummy fallback dump_stack() implementation in
> lib/dump_stack.c such that it prints out debug information (taken from
> x86) and invokes show_stack(NULL, NULL) and drops arch-specific
> dump_stack() implementations in all archs except blackfin. Blackfin's
> dump_stack() does something wonky that I don't understand.

arch/tile has a dump_stack() entry point in assembly (see arch/tile/kernel/entry.S) that passes to _dump_stack(), which passes to dump_stack_regs(), which passes to tile_show_stack(). Similarly, show_stack() passes to tile_show_stack(), which does lots of work to cross into userspace and continue showing the stack if possible, print symbol info for both kernel and userspace, etc. I don't know if that's all supported fully in Tejun's generic version.

Would it make sense for me to look at this after it's merged up into -next and see what tile needs? Unfortunately I'm taking off for a week's vacation so won't be able to do much until after the 23rd.

Chris Metcalf, Tilera Corp.

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