path: root/arch/powerpc/kernel/head_40x.S
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authorChristophe Leroy <christophe.leroy@c-s.fr>2019-01-31 10:08:52 +0000
committerMichael Ellerman <mpe@ellerman.id.au>2019-02-23 22:31:40 +1100
commit018cce33c5e62dda265df8ae0ddf7f3a3357ad1f (patch)
tree2e441439ad12b6bbf76c0e9d00bc6f0a59a24e0d /arch/powerpc/kernel/head_40x.S
parent054860897cd35a4e9cec953ae955b429e31e74f7 (diff)
powerpc: prep stack walkers for THREAD_INFO_IN_TASK
[text copied from commit 9bbd4c56b0b6 ("arm64: prep stack walkers for THREAD_INFO_IN_TASK")] 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 powerpc 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. Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> [mpe: Move try_get_task_stack() below tsk == NULL check in show_stack()] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/head_40x.S')
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