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Subject[PATCH] x86: Issue a warning if number of present CPUs > maxcpus and CONFIG_HOTPLUG=n
Note that the check against i (value passed as maxcpus, but at least 1)
is repeated further down, including the warning, but since possible is
already clamped to max_cpus at that time, it is never printed. In fact,
for the non-hotplug case, the warning about exceeding maxcpus is only
ever printed if "possible_cpus" was also specified on the command line.

I strongly believe that such limitation was unintentional.

I also changed the message slightly -- the kernel parameter name is
maxcpus, not max_cpus.

Signed-off-by: Petr Tesarik <>
arch/x86/kernel/smpboot.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index a32da80..376b6c6 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1226,9 +1226,6 @@ __init void prefill_possible_map(void)
if (setup_max_cpus)
possible += disabled_cpus;
- if (possible > i)
- possible = i;
} else
possible = setup_possible_cpus;
@@ -1246,7 +1243,7 @@ __init void prefill_possible_map(void)
if (!setup_max_cpus)
if (possible > i) {
- pr_warn("%d Processors exceeds max_cpus limit of %u\n",
+ pr_warn("%d Processors exceeds maxcpus limit of %u\n",
possible, setup_max_cpus);
possible = i;

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