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xtensa: fix get_wchan
authorMax Filippov <jcmvbkbc@gmail.com>
Wed, 2 Jan 2019 09:08:32 +0000 (01:08 -0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 13 Mar 2019 21:03:10 +0000 (14:03 -0700)
commit1b0322ebab523163f6b1ca189191c125bf58ebbc
tree032ae898e5fdb9537eda855f11286076460cd964tree
parentaf46f4c0372aea3813afa6f2d9debb39346655c3commit | diff
xtensa: fix get_wchan

commit d90b88fd3653f1fb66ecc6571b860d5a5749fa56 upstream.

Stack unwinding is implemented incorrectly in xtensa get_wchan: instead
of extracting a0 and a1 registers from the spill location under the
stack pointer it extracts a word pointed to by the stack pointer and
subtracts 4 or 3 from it.

Cc: stable@vger.kernel.org
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/xtensa/kernel/process.c diff | blob | history
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