| Message ID | E1r0JLg-00CTxd-31@rmk-PC.armlinux.org.uk (mailing list archive) |
|---|---|
| State | Handled Elsewhere |
| Headers | show |
| Series | Initial cleanups for vCPU hotplug | expand |
On 11/7/23 18:30, Russell King (Oracle) wrote: > From: James Morse <james.morse@arm.com> > > loongarch, mips, parisc, riscv and sh all print a warning if > register_cpu() returns an error. Architectures that use > GENERIC_CPU_DEVICES call panic() instead. > > Errors in this path indicate something is wrong with the firmware > description of the platform, but the kernel is able to keep running. > > Downgrade this to a warning to make it easier to debug this issue. > > This will allow architectures that switching over to GENERIC_CPU_DEVICES > to drop their warning, but keep the existing behaviour. > > Signed-off-by: James Morse <james.morse@arm.com> > Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> > Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Reviewed-by: Shaoqin Huang <shahuang@redhat.com> > --- > drivers/base/cpu.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-) > > diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c > index 221ffbeb1c9b..82b6a76125f5 100644 > --- a/drivers/base/cpu.c > +++ b/drivers/base/cpu.c > @@ -551,14 +551,15 @@ void __weak arch_unregister_cpu(int num) > > static void __init cpu_dev_register_generic(void) > { > - int i; > + int i, ret; > > if (!IS_ENABLED(CONFIG_GENERIC_CPU_DEVICES)) > return; > > for_each_present_cpu(i) { > - if (arch_register_cpu(i)) > - panic("Failed to register CPU device"); > + ret = arch_register_cpu(i); > + if (ret) > + pr_warn("register_cpu %d failed (%d)\n", i, ret); > } > } >
On 11/7/23 20:30, Russell King (Oracle) wrote: > From: James Morse <james.morse@arm.com> > > loongarch, mips, parisc, riscv and sh all print a warning if > register_cpu() returns an error. Architectures that use > GENERIC_CPU_DEVICES call panic() instead. > > Errors in this path indicate something is wrong with the firmware > description of the platform, but the kernel is able to keep running. > > Downgrade this to a warning to make it easier to debug this issue. > > This will allow architectures that switching over to GENERIC_CPU_DEVICES > to drop their warning, but keep the existing behaviour. > > Signed-off-by: James Morse <james.morse@arm.com> > Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> > Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> > --- > drivers/base/cpu.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-) > Reviewed-by: Gavin Shan <gshan@redhat.com>
On Tue, 07 Nov 2023 10:30:20 +0000 Russell King <rmk+kernel@armlinux.org.uk> wrote: > From: James Morse <james.morse@arm.com> > > loongarch, mips, parisc, riscv and sh all print a warning if > register_cpu() returns an error. Architectures that use > GENERIC_CPU_DEVICES call panic() instead. > > Errors in this path indicate something is wrong with the firmware > description of the platform, but the kernel is able to keep running. > > Downgrade this to a warning to make it easier to debug this issue. > > This will allow architectures that switching over to GENERIC_CPU_DEVICES > to drop their warning, but keep the existing behaviour. > > Signed-off-by: James Morse <james.morse@arm.com> > Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> > Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> I guess there may be paths later that were never exposed because of this panic, but any such should be fixed rather than relying on this big hammer. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c index 221ffbeb1c9b..82b6a76125f5 100644 --- a/drivers/base/cpu.c +++ b/drivers/base/cpu.c @@ -551,14 +551,15 @@ void __weak arch_unregister_cpu(int num) static void __init cpu_dev_register_generic(void) { - int i; + int i, ret; if (!IS_ENABLED(CONFIG_GENERIC_CPU_DEVICES)) return; for_each_present_cpu(i) { - if (arch_register_cpu(i)) - panic("Failed to register CPU device"); + ret = arch_register_cpu(i); + if (ret) + pr_warn("register_cpu %d failed (%d)\n", i, ret); } }