forked from Minki/linux
89e09f5ebb
During some code inspection using gcc 4.0 I noticed a stack frame was being created for a number of functions that didnt require it. For example: c0000000000df944 <._spin_unlock>: c0000000000df944: fb e1 ff f0 std r31,-16(r1) c0000000000df948: f8 21 ff c1 stdu r1,-64(r1) c0000000000df94c: 7c 3f 0b 78 mr r31,r1 c0000000000df950: 7c 20 04 ac lwsync c0000000000df954: e8 21 00 00 ld r1,0(r1) c0000000000df958: 38 00 00 00 li r0,0 c0000000000df95c: 90 03 00 00 stw r0,0(r3) c0000000000df960: eb e1 ff f0 ld r31,-16(r1) c0000000000df964: 4e 80 00 20 blr It turns out we are adding -fno-omit-frame-pointer to ppc64 which is causing the above behaviour. Removing that flag results in much better code: c0000000000d5b30 <._spin_unlock>: c0000000000d5b30: 7c 20 04 ac lwsync c0000000000d5b34: 38 00 00 00 li r0,0 c0000000000d5b38: 90 03 00 00 stw r0,0(r3) c0000000000d5b3c: 4e 80 00 20 blr We dont require a frame pointer to debug on ppc64, so remove it. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
420 lines
9.5 KiB
Plaintext
420 lines
9.5 KiB
Plaintext
#
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# For a description of the syntax of this configuration file,
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# see Documentation/kbuild/kconfig-language.txt.
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#
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config 64BIT
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def_bool y
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config MMU
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bool
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default y
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config UID16
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bool
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config RWSEM_GENERIC_SPINLOCK
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bool
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config RWSEM_XCHGADD_ALGORITHM
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bool
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default y
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config GENERIC_CALIBRATE_DELAY
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bool
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default y
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config GENERIC_ISA_DMA
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bool
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default y
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config HAVE_DEC_LOCK
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bool
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default y
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config EARLY_PRINTK
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bool
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default y
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config COMPAT
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bool
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default y
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# We optimistically allocate largepages from the VM, so make the limit
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# large enough (16MB). This badly named config option is actually
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# max order + 1
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config FORCE_MAX_ZONEORDER
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int
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default "13"
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source "init/Kconfig"
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config SYSVIPC_COMPAT
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bool
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depends on COMPAT && SYSVIPC
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default y
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menu "Platform support"
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choice
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prompt "Platform Type"
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default PPC_MULTIPLATFORM
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config PPC_ISERIES
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bool "IBM Legacy iSeries"
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config PPC_MULTIPLATFORM
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bool "Generic"
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endchoice
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config PPC_PSERIES
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depends on PPC_MULTIPLATFORM
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bool " IBM pSeries & new iSeries"
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default y
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config PPC_PMAC
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depends on PPC_MULTIPLATFORM
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bool " Apple G5 based machines"
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default y
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select U3_DART
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config PPC_MAPLE
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depends on PPC_MULTIPLATFORM
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bool " Maple 970FX Evaluation Board"
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select U3_DART
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select MPIC_BROKEN_U3
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default n
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help
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This option enables support for the Maple 970FX Evaluation Board.
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For more informations, refer to <http://www.970eval.com>
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config PPC
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bool
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default y
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config PPC64
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bool
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default y
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config PPC_OF
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depends on PPC_MULTIPLATFORM
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bool
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default y
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# VMX is pSeries only for now until somebody writes the iSeries
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# exception vectors for it
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config ALTIVEC
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bool "Support for VMX (Altivec) vector unit"
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depends on PPC_MULTIPLATFORM
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default y
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config PPC_SPLPAR
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depends on PPC_PSERIES
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bool "Support for shared-processor logical partitions"
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default n
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help
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Enabling this option will make the kernel run more efficiently
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on logically-partitioned pSeries systems which use shared
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processors, that is, which share physical processors between
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two or more partitions.
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config IBMVIO
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depends on PPC_PSERIES || PPC_ISERIES
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bool
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default y
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config U3_DART
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bool
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depends on PPC_MULTIPLATFORM
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default n
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config MPIC_BROKEN_U3
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bool
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depends on PPC_MAPLE
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default y
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config PPC_PMAC64
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bool
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depends on PPC_PMAC
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default y
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config BOOTX_TEXT
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bool "Support for early boot text console"
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depends PPC_OF
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help
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Say Y here to see progress messages from the boot firmware in text
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mode. Requires an Open Firmware compatible video card.
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config POWER4_ONLY
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bool "Optimize for POWER4"
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default n
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---help---
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Cause the compiler to optimize for POWER4 processors. The resulting
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binary will not work on POWER3 or RS64 processors when compiled with
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binutils 2.15 or later.
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config IOMMU_VMERGE
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bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
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depends on EXPERIMENTAL
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default n
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help
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Cause IO segments sent to a device for DMA to be merged virtually
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by the IOMMU when they happen to have been allocated contiguously.
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This doesn't add pressure to the IOMMU allocator. However, some
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drivers don't support getting large merged segments coming back
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from *_map_sg(). Say Y if you know the drivers you are using are
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properly handling this case.
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config SMP
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bool "Symmetric multi-processing support"
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---help---
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This enables support for systems with more than one CPU. If you have
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a system with only one CPU, say N. If you have a system with more
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than one CPU, say Y.
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If you say N here, the kernel will run on single and multiprocessor
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machines, but will use only one CPU of a multiprocessor machine. If
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you say Y here, the kernel will run on single-processor machines.
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On a single-processor machine, the kernel will run faster if you say
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N here.
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If you don't know what to do here, say Y.
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config NR_CPUS
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int "Maximum number of CPUs (2-128)"
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range 2 128
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depends on SMP
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default "32"
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config HMT
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bool "Hardware multithreading"
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depends on SMP && PPC_PSERIES && BROKEN
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help
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This option enables hardware multithreading on RS64 cpus.
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pSeries systems p620 and p660 have such a cpu type.
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config DISCONTIGMEM
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bool "Discontiguous Memory Support"
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depends on SMP && PPC_PSERIES
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config NUMA
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bool "NUMA support"
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depends on DISCONTIGMEM
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config SCHED_SMT
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bool "SMT (Hyperthreading) scheduler support"
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depends on SMP
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default off
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help
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SMT scheduler support improves the CPU scheduler's decision making
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when dealing with POWER5 cpus at a cost of slightly increased
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overhead in some places. If unsure say N here.
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config PREEMPT
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bool "Preemptible Kernel"
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help
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This option reduces the latency of the kernel when reacting to
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real-time or interactive events by allowing a low priority process to
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be preempted even if it is in kernel mode executing a system call.
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Say Y here if you are building a kernel for a desktop, embedded
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or real-time system. Say N if you are unsure.
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config PREEMPT_BKL
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bool "Preempt The Big Kernel Lock"
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depends on PREEMPT
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default y
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help
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This option reduces the latency of the kernel by making the
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big kernel lock preemptible.
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Say Y here if you are building a kernel for a desktop system.
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Say N if you are unsure.
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config EEH
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bool "PCI Extended Error Handling (EEH)" if EMBEDDED
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depends on PPC_PSERIES
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default y if !EMBEDDED
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#
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# Use the generic interrupt handling code in kernel/irq/:
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#
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config GENERIC_HARDIRQS
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bool
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default y
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config MSCHUNKS
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bool
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depends on PPC_ISERIES
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default y
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config PPC_RTAS
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bool
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depends on PPC_PSERIES
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default y
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config RTAS_PROC
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bool "Proc interface to RTAS"
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depends on PPC_RTAS
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config RTAS_FLASH
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tristate "Firmware flash interface"
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depends on RTAS_PROC
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config SCANLOG
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tristate "Scanlog dump interface"
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depends on RTAS_PROC && PPC_PSERIES
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config LPARCFG
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tristate "LPAR Configuration Data"
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depends on PPC_PSERIES || PPC_ISERIES
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help
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Provide system capacity information via human readable
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<key word>=<value> pairs through a /proc/ppc64/lparcfg interface.
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config SECCOMP
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bool "Enable seccomp to safely compute untrusted bytecode"
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depends on PROC_FS
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default y
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help
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This kernel feature is useful for number crunching applications
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that may need to compute untrusted bytecode during their
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execution. By using pipes or other transports made available to
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the process as file descriptors supporting the read/write
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syscalls, it's possible to isolate those applications in
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their own address space using seccomp. Once seccomp is
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enabled via /proc/<pid>/seccomp, it cannot be disabled
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and the task is only allowed to execute a few safe syscalls
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defined by each seccomp mode.
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If unsure, say Y. Only embedded should say N here.
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endmenu
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menu "General setup"
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config ISA
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bool
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help
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Find out whether you have ISA slots on your motherboard. ISA is the
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name of a bus system, i.e. the way the CPU talks to the other stuff
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inside your box. If you have an Apple machine, say N here; if you
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have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
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you have an embedded board, consult your board documentation.
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config SBUS
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bool
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config MCA
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bool
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config EISA
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bool
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config PCI
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bool
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default y
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help
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Find out whether your system includes a PCI bus. PCI is the name of
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a bus system, i.e. the way the CPU talks to the other stuff inside
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your box. If you say Y here, the kernel will include drivers and
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infrastructure code to support PCI bus devices.
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config PCI_DOMAINS
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bool
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default PCI
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source "fs/Kconfig.binfmt"
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source "drivers/pci/Kconfig"
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config HOTPLUG_CPU
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bool "Support for hot-pluggable CPUs"
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depends on SMP && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
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select HOTPLUG
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---help---
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Say Y here to be able to turn CPUs off and on.
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Say N if you are unsure.
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source "drivers/pcmcia/Kconfig"
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source "drivers/pci/hotplug/Kconfig"
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config PROC_DEVICETREE
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bool "Support for Open Firmware device tree in /proc"
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depends on !PPC_ISERIES
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help
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This option adds a device-tree directory under /proc which contains
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an image of the device tree that the kernel copies from Open
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Firmware. If unsure, say Y here.
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config CMDLINE_BOOL
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bool "Default bootloader kernel arguments"
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depends on !PPC_ISERIES
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config CMDLINE
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string "Initial kernel command string"
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depends on CMDLINE_BOOL
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default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
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help
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On some platforms, there is currently no way for the boot loader to
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pass arguments to the kernel. For these platforms, you can supply
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some command-line options at build time by entering them here. In
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most cases you will need to specify the root device here.
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endmenu
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source "drivers/Kconfig"
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source "fs/Kconfig"
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menu "iSeries device drivers"
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depends on PPC_ISERIES
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config VIOCONS
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tristate "iSeries Virtual Console Support"
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config VIODASD
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tristate "iSeries Virtual I/O disk support"
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help
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If you are running on an iSeries system and you want to use
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virtual disks created and managed by OS/400, say Y.
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config VIOCD
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tristate "iSeries Virtual I/O CD support"
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help
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If you are running Linux on an IBM iSeries system and you want to
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read a CD drive owned by OS/400, say Y here.
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config VIOTAPE
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tristate "iSeries Virtual Tape Support"
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help
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If you are running Linux on an iSeries system and you want Linux
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to read and/or write a tape drive owned by OS/400, say Y here.
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endmenu
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config VIOPATH
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bool
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depends on VIOCONS || VIODASD || VIOCD || VIOTAPE || VETH
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default y
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source "arch/ppc64/oprofile/Kconfig"
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source "arch/ppc64/Kconfig.debug"
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source "security/Kconfig"
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config KEYS_COMPAT
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bool
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depends on COMPAT && KEYS
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default y
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source "crypto/Kconfig"
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source "lib/Kconfig"
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