]> git.baikalelectronics.ru Git - kernel.git/commit
MIPS: smp-cps: Stop printing EJTAG exceptions to UART
authorPaul Burton <paul.burton@imgtec.com>
Wed, 3 Feb 2016 03:15:35 +0000 (03:15 +0000)
committerRalf Baechle <ralf@linux-mips.org>
Fri, 13 May 2016 12:01:51 +0000 (14:01 +0200)
commitdbe48de772fb6a866889f2adea62562f657a9e79
treee4340631d75a1fa95394648fc1a9bfc8b79757f4
parent3ffb1fd21d70de9b950e742e65c82f94bb39a7fa
MIPS: smp-cps: Stop printing EJTAG exceptions to UART

When CONFIG_MIPS_CPS_NS16550 is enabled, some register state is dumped
to the UART when an exception is taken via the BEV on secondary cores.
EJTAG exceptions are architecturally expected to be handled by the BEV
even when Status.BEV is 0. This effectively means that if userland
executes an sdbbp instruction on a secondary core then the kernel dumps
register state to the UART even though the exception is perfectly normal
& expected. Prevent this by simply not dumping information to the UART
for EJTAG exceptions.

Fixes: ff44e6408776 ("MIPS: CPS: Early debug using an ns16550-compatible UART")
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12341/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
arch/mips/kernel/cps-vec.S