4.18-stable review patch. If anyone has any objections, please let me know.
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From: "David S. Miller" davem@davemloft.net
[ Upstream commit d1f1f98c6d1708a90436e1a3b2aff5e93946731b ]
If we did some signal processing, we have to reload the pt_regs tstate register because it's value may have changed.
In doing so we also have to extract the %pil value contained in there anre load that into %l4.
This value is at bit 20 and thus needs to be shifted down before we later write it into the %pil register.
Most of the time this is harmless as we are returning to userspace and the %pil is zero for that case.
Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/sparc/kernel/rtrap_64.S | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/sparc/kernel/rtrap_64.S +++ b/arch/sparc/kernel/rtrap_64.S @@ -85,8 +85,9 @@ __handle_signal: ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1 sethi %hi(0xf << 20), %l4 and %l1, %l4, %l4 + andn %l1, %l4, %l1 ba,pt %xcc, __handle_preemption_continue - andn %l1, %l4, %l1 + srl %l4, 20, %l4
/* When returning from a NMI (%pil==15) interrupt we want to * avoid running softirqs, doing IRQ tracing, preempting, etc.