system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-09-30 16:29:47 +00:00
Code Issues Packages Projects Releases Wiki Activity

drivers/tty: Explicitly pass current to show_stack

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/tty/sysrq.c
View file

@ -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);
}