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author | Miroslav Benes <mbenes@suse.cz> | 2020-03-26 10:26:03 +0100 |
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committer | Juergen Gross <jgross@suse.com> | 2020-03-30 17:32:10 +0200 |
commit | c3881eb58d56116c79ac4ee4f40fd15ead124c4b (patch) | |
tree | 1cd15be069bf435ff0ed342a019cd23ff2b4b3de /drivers/thermal | |
parent | 2f62f36e62daec43aa7b9633ef7f18e042a80bed (diff) |
x86/xen: Make the secondary CPU idle tasks reliable
The unwinder reports the secondary CPU idle tasks' stack on XEN PV as
unreliable, which affects at least live patching.
cpu_initialize_context() sets up the context of the CPU through
VCPUOP_initialise hypercall. After it is woken up, the idle task starts
in cpu_bringup_and_idle() function and its stack starts at the offset
right below pt_regs. The unwinder correctly detects the end of stack
there but it is confused by NULL return address in the last frame.
Introduce a wrapper in assembly, which just calls
cpu_bringup_and_idle(). The return address is thus pushed on the stack
and the wrapper contains the annotation hint for the unwinder regarding
the stack state.
Signed-off-by: Miroslav Benes <mbenes@suse.cz>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'drivers/thermal')
0 files changed, 0 insertions, 0 deletions