PCI: remove ARCH_SUPPORTS_MSI kconfig option

Now that we have weak versions for each of the PCI MSI architecture
functions, we can actually build the MSI support for all platforms,
regardless of whether they provide or not architecture-specific
versions of those functions. For this reason, the ARCH_SUPPORTS_MSI
hidden kconfig boolean becomes useless, and this patch gets rid of it.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Tested-by: NDaniel Price <daniel.price@gmail.com>
Tested-by: NThierry Reding <thierry.reding@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: linux390@de.ibm.com
Cc: linux-s390@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: x86@kernel.org
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: linux-ia64@vger.kernel.org
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: David S. Miller <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Cc: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: NJason Cooper <jason@lakedaemon.net>

arch/arm/Kconfig

@@ -441,7 +441,6 @@ config ARCH_NETX
 config ARCH_IOP13XX
 	bool "IOP13xx-based"
 	depends on MMU
-	select ARCH_SUPPORTS_MSI
 	select CPU_XSC3
 	select NEED_MACH_MEMORY_H
 	select NEED_RET_TO_USER

arch/ia64/Kconfig

@@ -9,7 +9,6 @@ config IA64
 	select PCI if (!IA64_HP_SIM)
 	select ACPI if (!IA64_HP_SIM)
 	select PM if (!IA64_HP_SIM)
-	select ARCH_SUPPORTS_MSI
 	select HAVE_UNSTABLE_SCHED_CLOCK
 	select HAVE_IDE
 	select HAVE_OPROFILE

arch/mips/Kconfig

@@ -726,7 +726,6 @@ config CAVIUM_OCTEON_SOC
 	select SYS_HAS_CPU_CAVIUM_OCTEON
 	select SWAP_IO_SPACE
 	select HW_HAS_PCI
-	select ARCH_SUPPORTS_MSI
 	select ZONE_DMA32
 	select USB_ARCH_HAS_OHCI
 	select USB_ARCH_HAS_EHCI
@@ -762,7 +761,6 @@ config NLM_XLR_BOARD
 	select CEVT_R4K
 	select CSRC_R4K
 	select IRQ_CPU
-	select ARCH_SUPPORTS_MSI
 	select ZONE_DMA32 if 64BIT
 	select SYNC_R4K
 	select SYS_HAS_EARLY_PRINTK

arch/powerpc/Kconfig

@@ -727,7 +727,6 @@ config PCI
 	default y if !40x && !CPM2 && !8xx && !PPC_83xx \
 		&& !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
 	default PCI_QSPAN if !4xx && !CPM2 && 8xx
-	select ARCH_SUPPORTS_MSI
 	select GENERIC_PCI_IOMAP
 	help
 	  Find out whether your system includes a PCI bus. PCI is the name of

arch/s390/Kconfig

@@ -428,7 +428,6 @@ menuconfig PCI
 	bool "PCI support"
 	default n
 	depends on 64BIT
-	select ARCH_SUPPORTS_MSI
 	select PCI_MSI
 	help
 	  Enable PCI support.

arch/sparc/Kconfig

@@ -52,7 +52,6 @@ config SPARC32
 
 config SPARC64
 	def_bool 64BIT
-	select ARCH_SUPPORTS_MSI
 	select HAVE_FUNCTION_TRACER
 	select HAVE_FUNCTION_GRAPH_TRACER
 	select HAVE_FUNCTION_GRAPH_FP_TEST

arch/tile/Kconfig

@@ -380,7 +380,6 @@ config PCI
 	select PCI_DOMAINS
 	select GENERIC_PCI_IOMAP
 	select TILE_GXIO_TRIO if TILEGX
-	select ARCH_SUPPORTS_MSI if TILEGX
 	select PCI_MSI if TILEGX
 	---help---
 	  Enable PCI root complex support, so PCIe endpoint devices can

arch/x86/Kconfig

@@ -2014,7 +2014,6 @@ menu "Bus options (PCI etc.)"
 config PCI
 	bool "PCI support"
 	default y
-	select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
 	---help---
 	  Find out whether you have a PCI motherboard. PCI is the name of a
 	  bus system, i.e. the way the CPU talks to the other stuff inside

drivers/pci/Kconfig

 #
 # PCI configuration
 #
-config ARCH_SUPPORTS_MSI
-	bool
-
 config PCI_MSI
 	bool "Message Signaled Interrupts (MSI and MSI-X)"
 	depends on PCI
-	depends on ARCH_SUPPORTS_MSI
 	help
 	   This allows device drivers to enable MSI (Message Signaled
 	   Interrupts).  Message Signaled Interrupts enable a device to