linux-kernel - [tip:x86/apic] x86, irq: Refine the way to calculate NR

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Message-ID: <tip-9523785062ca8b0f2fdaddc5718d71adfc0d15b3@git.kernel.org>
Date:	Wed, 26 Nov 2014 15:21:57 -0800
From:	tip-bot for Jiang Liu <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	benh@...nel.crashing.org, jroedel@...e.de, mingo@...nel.org,
	JBeulich@...e.com, gregkh@...uxfoundation.org, joro@...tes.org,
	tony.luck@...el.com, bhelgaas@...gle.com,
	linux-kernel@...r.kernel.org, hpa@...or.com,
	jiang.liu@...ux.intel.com, rjw@...ysocki.net,
	konrad.wilk@...cle.com, tglx@...utronix.de, yinghai@...nel.org,
	bp@...en8.de, rdunlap@...radead.org
Subject: [tip:x86/apic] x86, irq: Refine the way to calculate NR_IRQS

Commit-ID:  9523785062ca8b0f2fdaddc5718d71adfc0d15b3
Gitweb:     http://git.kernel.org/tip/9523785062ca8b0f2fdaddc5718d71adfc0d15b3
Author:     Jiang Liu <jiang.liu@...ux.intel.com>
AuthorDate: Tue, 25 Nov 2014 15:49:59 +0800
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 26 Nov 2014 23:52:49 +0100

x86, irq: Refine the way to calculate NR_IRQS

Now we have made MSI independent of IOAPIC, so we need to refine the
way to calculate NR_IRQS to support configuration with MSI enabled but
IOAPIC disabled.

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Rafael J. Wysocki <rjw@...ysocki.net>
Cc: Randy Dunlap <rdunlap@...radead.org>
Cc: Yinghai Lu <yinghai@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Jan Beulich <JBeulich@...e.com>
Link: http://lkml.kernel.org/r/1416901802-24211-36-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Joerg Roedel <jroedel@...e.de>
---
 arch/x86/include/asm/irq_vectors.h | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h
index 666c89e..b26cb12 100644
--- a/arch/x86/include/asm/irq_vectors.h
+++ b/arch/x86/include/asm/irq_vectors.h
@@ -155,18 +155,22 @@ static inline int invalid_vm86_irq(int irq)
  * static arrays.
  */
 
-#define NR_IRQS_LEGACY			  16
+#define NR_IRQS_LEGACY			16
 
-#define IO_APIC_VECTOR_LIMIT		( 32 * MAX_IO_APICS )
+#define CPU_VECTOR_LIMIT		(64 * NR_CPUS)
+#define IO_APIC_VECTOR_LIMIT		(32 * MAX_IO_APICS)
 
-#ifdef CONFIG_X86_IO_APIC
-# define CPU_VECTOR_LIMIT		(64 * NR_CPUS)
-# define NR_IRQS					\
+#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_PCI_MSI)
+#define NR_IRQS						\
 	(CPU_VECTOR_LIMIT > IO_APIC_VECTOR_LIMIT ?	\
 		(NR_VECTORS + CPU_VECTOR_LIMIT)  :	\
 		(NR_VECTORS + IO_APIC_VECTOR_LIMIT))
-#else /* !CONFIG_X86_IO_APIC: */
-# define NR_IRQS			NR_IRQS_LEGACY
+#elif defined(CONFIG_X86_IO_APIC)
+#define	NR_IRQS				(NR_VECTORS + IO_APIC_VECTOR_LIMIT)
+#elif defined(CONFIG_PCI_MSI)
+#define NR_IRQS				(NR_VECTORS + CPU_VECTOR_LIMIT)
+#else
+#define NR_IRQS				NR_IRQS_LEGACY
 #endif
 
 #endif /* _ASM_X86_IRQ_VECTORS_H */
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