parisc: Use num_present_cpus() in alternative patching code

hdeller · hdeller · commit b6405f0829d7 · 2023-05-23T18:17:32.000+02:00
When patching the kernel code some alternatives depend on SMP vs. !SMP.
Use the value of num_present_cpus() instead of num_online_cpus() to
decide, otherwise we may run into issues if and additional CPU is
enabled after having loaded a module while only one CPU was enabled.

Signed-off-by: Helge Deller &lt;deller@gmx.de&gt;
Cc: &lt;stable@vger.kernel.org&gt; # v6.1+
diff --git a/arch/parisc/kernel/alternative.c b/arch/parisc/kernel/alternative.c
@@ -25,7 +25,7 @@ void __init_or_module apply_alternatives(struct alt_instr *start,
 {
 	struct alt_instr *entry;
 	int index = 0, applied = 0;
-	int num_cpus = num_online_cpus();
+	int num_cpus = num_present_cpus();
 	u16 cond_check;
 
 	cond_check = ALT_COND_ALWAYS |

Original file line number	Diff line number	Diff line change
`@@ -25,7 +25,7 @@ void __init_or_module apply_alternatives(struct alt_instr *start,`
`25`	`25`	`{`
`26`	`26`	`struct alt_instr *entry;`
`27`	`27`	`int index = 0, applied = 0;`
`28`		`- int num_cpus = num_online_cpus();`
	`28`	`+ int num_cpus = num_present_cpus();`
`29`	`29`	`u16 cond_check;`
`30`	`30`
`31`	`31`	`cond_check = ALT_COND_ALWAYS \|`