arm64: prep stack walkers for THREAD_INFO_IN_TASK

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When CONFIG_THREAD_INFO_IN_TASK is selected, task stacks may be freed
before a task is destroyed. To account for this, the stacks are
refcounted, and when manipulating the stack of another task, it is
necessary to get/put the stack to ensure it isn't freed and/or re-used
while we do so.

This patch reworks the arm64 stack walking code to account for this.
When CONFIG_THREAD_INFO_IN_TASK is not selected these perform no
refcounting, and this should only be a structural change that does not
affect behaviour.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Laura Abbott <labbott@redhat.com>
Cc: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: James Morse <james.morse@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

...

This commit is contained in:

Mark Rutland 2016-11-03 20:23:08 +00:00 • committed by Catalin Marinas

parent 2020a5ae7c

commit 9bbd4c56b0

3 changed files with 24 additions and 6 deletions

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20

arch/arm64/kernel/process.c

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5

arch/arm64/kernel/stacktrace.c

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5

arch/arm64/kernel/traps.c

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