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drivers/tty: Explicitly pass current to show_stack

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As noted in commit:

  81539169f2 ("x86/dumpstack: Remove NULL task pointer convention")

... having a NULL task parameter imply current leads to subtle bugs in stack
walking code (so far seen on both 86 and arm64), makes callsites harder to
read, and is unnecessary as all callers have access to current.

As a step towards removing the problematic NULL-implies-current idiom entirely,
have the sysrq code explicitly pass current to show_stack.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mark Rutland 2016-09-26 16:16:18 +01:00 committed by Greg Kroah-Hartman
parent 4b75f80003
commit 9f12cea96f
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/sysrq.c
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@ -224,7 +224,7 @@ static void showacpu(void *dummy)
spin_lock_irqsave(&show_lock, flags);
pr_info("CPU%d:\n", smp_processor_id());
show_stack(NULL, NULL);
show_stack(current, NULL);
spin_unlock_irqrestore(&show_lock, flags);
}