6.6-stable review patch. If anyone has any objections, please let me know.
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From: Sam Ravnborg sam@ravnborg.org
commit 98937707fea8375e8acea0aaa0b68a956dd52719 upstream.
Nick Bowler reported: When using newer kernels on my Ultra 60 with dual 450MHz UltraSPARC-II CPUs, I noticed that only CPU 0 comes up, while older kernels (including 4.7) are working fine with both CPUs.
I bisected the failure to this commit:
9b2f753ec23710aa32c0d837d2499db92fe9115b is the first bad commit commit 9b2f753ec23710aa32c0d837d2499db92fe9115b Author: Atish Patra atish.patra@oracle.com Date: Thu Sep 15 14:54:40 2016 -0600
sparc64: Fix cpu_possible_mask if nr_cpus is set
This is a small change that reverts very easily on top of 5.18: there is just one trivial conflict. Once reverted, both CPUs work again.
Maybe this is related to the fact that the CPUs on this system are numbered CPU0 and CPU2 (there is no CPU1)?
The current code that adjust cpu_possible based on nr_cpu_ids do not take into account that CPU's may not come one after each other. Move the chech to the function that setup the cpu_possible mask so there is no need to adjust it later.
Signed-off-by: Sam Ravnborg sam@ravnborg.org Fixes: 9b2f753ec237 ("sparc64: Fix cpu_possible_mask if nr_cpus is set") Reported-by: Nick Bowler nbowler@draconx.ca Tested-by: Nick Bowler nbowler@draconx.ca Link: https://lore.kernel.org/sparclinux/20201009161924.c8f031c079dd852941307870@g... Link: https://lore.kernel.org/all/CADyTPEwt=ZNams+1bpMB1F9w_vUdPsGCt92DBQxxq_VtaLo... Cc: stable@vger.kernel.org # v4.8+ Cc: Andreas Larsson andreas@gaisler.com Cc: David S. Miller davem@davemloft.net Cc: Atish Patra atish.patra@oracle.com Cc: Bob Picco bob.picco@oracle.com Cc: Vijay Kumar vijay.ac.kumar@oracle.com Cc: David S. Miller davem@davemloft.net Reviewed-by: Andreas Larsson andreas@gaisler.com Acked-by: Arnd Bergmann arnd@arndb.de Link: https://lore.kernel.org/r/20240330-sparc64-warnings-v1-9-37201023ee2f@ravnbo... Signed-off-by: Andreas Larsson andreas@gaisler.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/sparc/include/asm/smp_64.h | 2 -- arch/sparc/kernel/prom_64.c | 4 +++- arch/sparc/kernel/setup_64.c | 1 - arch/sparc/kernel/smp_64.c | 14 -------------- 4 files changed, 3 insertions(+), 18 deletions(-)
--- a/arch/sparc/include/asm/smp_64.h +++ b/arch/sparc/include/asm/smp_64.h @@ -47,7 +47,6 @@ void arch_send_call_function_ipi_mask(co int hard_smp_processor_id(void); #define raw_smp_processor_id() (current_thread_info()->cpu)
-void smp_fill_in_cpu_possible_map(void); void smp_fill_in_sib_core_maps(void); void __noreturn cpu_play_dead(void);
@@ -77,7 +76,6 @@ void __cpu_die(unsigned int cpu); #define smp_fill_in_sib_core_maps() do { } while (0) #define smp_fetch_global_regs() do { } while (0) #define smp_fetch_global_pmu() do { } while (0) -#define smp_fill_in_cpu_possible_map() do { } while (0) #define smp_init_cpu_poke() do { } while (0) #define scheduler_poke() do { } while (0)
--- a/arch/sparc/kernel/prom_64.c +++ b/arch/sparc/kernel/prom_64.c @@ -483,7 +483,9 @@ static void *record_one_cpu(struct devic ncpus_probed++; #ifdef CONFIG_SMP set_cpu_present(cpuid, true); - set_cpu_possible(cpuid, true); + + if (num_possible_cpus() < nr_cpu_ids) + set_cpu_possible(cpuid, true); #endif return NULL; } --- a/arch/sparc/kernel/setup_64.c +++ b/arch/sparc/kernel/setup_64.c @@ -684,7 +684,6 @@ void __init setup_arch(char **cmdline_p)
paging_init(); init_sparc64_elf_hwcap(); - smp_fill_in_cpu_possible_map(); /* * Once the OF device tree and MDESC have been setup and nr_cpus has * been parsed, we know the list of possible cpus. Therefore we can --- a/arch/sparc/kernel/smp_64.c +++ b/arch/sparc/kernel/smp_64.c @@ -1220,20 +1220,6 @@ void __init smp_setup_processor_id(void) xcall_deliver_impl = hypervisor_xcall_deliver; }
-void __init smp_fill_in_cpu_possible_map(void) -{ - int possible_cpus = num_possible_cpus(); - int i; - - if (possible_cpus > nr_cpu_ids) - possible_cpus = nr_cpu_ids; - - for (i = 0; i < possible_cpus; i++) - set_cpu_possible(i, true); - for (; i < NR_CPUS; i++) - set_cpu_possible(i, false); -} - void smp_fill_in_sib_core_maps(void) { unsigned int i;