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Date: Fri, 17 Feb 2017 17:05:48 +1100 From: Michael Ellerman <mpe@...erman.id.au> To: Pan Xinhui <xinhui@...ux.vnet.ibm.com>, "Guilherme G. Piccoli" <gpiccoli@...ux.vnet.ibm.com>, Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>, linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org Cc: benh@...nel.crashing.org, paulus@...ba.org, npiggin@...il.com Subject: Re: [PATCH] powerpc/xmon: Fix an unexpected xmon onoff state change Pan Xinhui <xinhui@...ux.vnet.ibm.com> writes: > diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c > index 9c0e17c..f6e5c3d 100644 > --- a/arch/powerpc/xmon/xmon.c > +++ b/arch/powerpc/xmon/xmon.c > @@ -76,6 +76,7 @@ static int xmon_gate; > #endif /* CONFIG_SMP */ > > static unsigned long in_xmon __read_mostly = 0; > +static int xmon_off = !IS_ENABLED(CONFIG_XMON_DEFAULT); I think the logic would probably clearer if we invert this to become xmon_on. > @@ -3266,16 +3269,16 @@ static int __init setup_xmon_sysrq(void) > __initcall(setup_xmon_sysrq); > #endif /* CONFIG_MAGIC_SYSRQ */ > > -static int __initdata xmon_early, xmon_off; > +static int __initdata xmon_early; > > static int __init early_parse_xmon(char *p) > { > if (!p || strncmp(p, "early", 5) == 0) { > /* just "xmon" is equivalent to "xmon=early" */ > - xmon_init(1); > xmon_early = 1; > + xmon_off = 0; > } else if (strncmp(p, "on", 2) == 0) > - xmon_init(1); > + xmon_off = 0; You've just changed the timing of when xmon gets enabled for the above two cases, from here which is called very early, to xmon_setup() which is called much later in boot. That effectively disables xmon for most of the boot, which we do not want to do. cheers
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