From: "Naveen N. Rao" naveen.n.rao@linux.vnet.ibm.com
[ Upstream commit aaf06665f7ea3ee9f9754e16c1a507a89f1de5b1 ]
Commit ed49f7fd6438d ("powerpc/xmon: Disable tracing when entering xmon") added code to disable recording trace entries while in xmon. The commit introduced a variable 'tracing_enabled' to record if tracing was enabled on xmon entry, and used this to conditionally enable tracing during exit from xmon.
However, we are not checking the value of 'fromipi' variable in xmon_core() when setting 'tracing_enabled'. Due to this, when secondary cpus enter xmon, they will see tracing as being disabled already and tracing won't be re-enabled on exit. Fix the same.
Fixes: ed49f7fd6438d ("powerpc/xmon: Disable tracing when entering xmon") Signed-off-by: Naveen N. Rao naveen.n.rao@linux.vnet.ibm.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Sasha Levin sashal@kernel.org --- arch/powerpc/xmon/xmon.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c index a0f44f992360..c608e3fa6d3b 100644 --- a/arch/powerpc/xmon/xmon.c +++ b/arch/powerpc/xmon/xmon.c @@ -466,8 +466,10 @@ static int xmon_core(struct pt_regs *regs, int fromipi) local_irq_save(flags); hard_irq_disable();
- tracing_enabled = tracing_is_on(); - tracing_off(); + if (!fromipi) { + tracing_enabled = tracing_is_on(); + tracing_off(); + }
bp = in_breakpoint_table(regs->nip, &offset); if (bp != NULL) {