[tip: x86/apic] smp: Provide 'setup_max_cpus' definition on UP too

[tip-bot2 for Ingo Molnar]

The following commit has been merged into the x86/apic branch of tip:

Commit-ID:     429bb0269058e2e1f4ab69a0d33d374933aa15b9
Gitweb:        https://git.kernel.org/tip/429bb0269058e2e1f4ab69a0d33d374933aa15b9
Author:        Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate:    Mon, 26 Feb 2024 12:07:31 +01:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Mon, 26 Feb 2024 12:13:40 +01:00

smp: Provide 'setup_max_cpus' definition on UP too

This was already defined locally by init/main.c, but let's make
it generic, as arch/x86/kernel/cpu/topology.c is going to make
use of it to have more uniform code.

[ Keep it a C variable, not a define, because there's
  some namespace overlap for the 'setup_max_cpus' token
  in existing function argument names. ]

Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
--
---
 include/linux/smp.h | 2 ++
 init/main.c         | 1 -
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/smp.h b/include/linux/smp.h
index e87520d..5a5985f 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -218,6 +218,8 @@ smp_call_function_any(const struct cpumask *mask, smp_call_func_t func,
 static inline void kick_all_cpus_sync(void) {  }
 static inline void wake_up_all_idle_cpus(void) {  }
 
+static const unsigned int setup_max_cpus = 0;
+
 #ifdef CONFIG_UP_LATE_INIT
 extern void __init up_late_init(void);
 static inline void smp_init(void) { up_late_init(); }
diff --git a/init/main.c b/init/main.c
index e24b078..5644bb1 100644
--- a/init/main.c
+++ b/init/main.c
@@ -603,7 +603,6 @@ static int __init rdinit_setup(char *str)
 __setup("rdinit=", rdinit_setup);
 
 #ifndef CONFIG_SMP
-static const unsigned int setup_max_cpus = NR_CPUS;
 static inline void setup_nr_cpu_ids(void) { }
 static inline void smp_prepare_cpus(unsigned int maxcpus) { }
 #endif