• Mark Rutland's avatar
    arm64: prep stack walkers for THREAD_INFO_IN_TASK · 9bbd4c56
    Mark Rutland authored
    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: default avatarMark Rutland <mark.rutland@arm.com>
    Tested-by: default avatarLaura 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: default avatarCatalin Marinas <catalin.marinas@arm.com>
traps.c 17 KB