linux-kernel - [tip:x86/urgent] x86/apic: Fix a warning message in logical CPU IDs allocation

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Date:   Wed, 1 Mar 2017 01:14:12 -0800
From:   tip-bot for Dou Liyang <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org, peterz@...radead.org,
        douly.fnst@...fujitsu.com, tglx@...utronix.de, hpa@...or.com
Subject: [tip:x86/urgent] x86/apic: Fix a warning message in logical CPU IDs
 allocation

Commit-ID:  bb3f0a52630c84807fca9bdd76ac2f5dcec82689
Gitweb:     http://git.kernel.org/tip/bb3f0a52630c84807fca9bdd76ac2f5dcec82689
Author:     Dou Liyang <douly.fnst@...fujitsu.com>
AuthorDate: Tue, 28 Feb 2017 13:50:52 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 1 Mar 2017 10:09:08 +0100

x86/apic: Fix a warning message in logical CPU IDs allocation

The current warning message in allocate_logical_cpuid() is somewhat confusing:

  Only 1 processors supported.Processor 2/0x2 and the rest are ignored.

As it might imply that there's only one CPU in the system - while what we ran
into here is a kernel limitation.

Fix the warning message to clarify all that:

  APIC: NR_CPUS/possible_cpus limit of 2 reached. Processor 2/0x2 and the rest are ignored.

( Also update the error return from -1 to -EINVAL, which is the more
  canonical return value. )

Signed-off-by: Dou Liyang <douly.fnst@...fujitsu.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: bp@...en8.de
Cc: nicstange@...il.com
Cc: wanpeng.li@...mail.com
Link: http://lkml.kernel.org/r/1488261052-25753-1-git-send-email-douly.fnst@cn.fujitsu.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/apic/apic.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 4261b32..11088b8 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2062,10 +2062,10 @@ static int allocate_logical_cpuid(int apicid)
 
 	/* Allocate a new cpuid. */
 	if (nr_logical_cpuids >= nr_cpu_ids) {
-		WARN_ONCE(1, "Only %d processors supported."
+		WARN_ONCE(1, "APIC: NR_CPUS/possible_cpus limit of %i reached. "
 			     "Processor %d/0x%x and the rest are ignored.\n",
-			     nr_cpu_ids - 1, nr_logical_cpuids, apicid);
-		return -1;
+			     nr_cpu_ids, nr_logical_cpuids, apicid);
+		return -EINVAL;
 	}
 
 	cpuid_to_apicid[nr_logical_cpuids] = apicid;