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linux_dsm_epyc7002/arch/powerpc/kernel
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Paul Mackerras a485c70989 powerpc: Fix "attempt to move .org backwards" error 
Building a 64-bit powerpc kernel with PR KVM enabled currently gives
this error:

  AS      arch/powerpc/kernel/head_64.o
arch/powerpc/kernel/exceptions-64s.S: Assembler messages:
arch/powerpc/kernel/exceptions-64s.S:258: Error: attempt to move .org backwards
make[2]: *** [arch/powerpc/kernel/head_64.o] Error 1

This happens because the MASKABLE_EXCEPTION_PSERIES macro turns into
33 instructions, but we only have space for 32 at the decrementer
interrupt vector (from 0x900 to 0x980).

In the code generated by the MASKABLE_EXCEPTION_PSERIES macro, we
currently have two instances of the HMT_MEDIUM macro, which has the
effect of setting the SMT thread priority to medium.  One is the
first instruction, and is overwritten by a no-op on processors where
we save the PPR (processor priority register), that is, POWER7 or
later.  The other is after we have saved the PPR.

In order to reduce the code at 0x900 by one instruction, we omit the
first HMT_MEDIUM.  On processors without SMT this will have no effect
since HMT_MEDIUM is a no-op there.  On POWER5 and RS64 machines this
will mean that the first few instructions take a little longer in the
case where a decrementer interrupt occurs when the hardware thread is
running at low SMT priority.  On POWER6 and later machines, the
hardware automatically boosts the thread priority when a decrementer
interrupt is taken if the thread priority was below medium, so this
change won't make any difference.

The alternative would be to branch out of line after saving the CFAR.
However, that would incur an extra overhead on all processors, whereas
the approach adopted here only adds overhead on older threaded processors.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-04-26 16:08:27 +10:00
..
vdso32 powerpc: Add VDSO version of time 2013-04-23 16:05:05 +10:00
vdso64 powerpc: Add VDSO version of time 2013-04-23 16:05:05 +10:00
.gitignore
align.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
asm-offsets.c Merge tag 'kvm-3.9-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm 2013-02-24 13:07:18 -08:00
audit.c
btext.c powerpc: various straight conversions from module.h --> export.h 2011-10-31 19:30:44 -04:00
cacheinfo.c cpu: convert 'cpu' and 'machinecheck' sysdev_class to a regular subsystem 2011-12-21 14:29:42 -08:00
cacheinfo.h
clock.c powerpc: various straight conversions from module.h --> export.h 2011-10-31 19:30:44 -04:00
compat_audit.c
cpu_setup_6xx.S powerpc: Fix some 6xx/7xxx CPU setup functions 2011-02-07 12:57:11 +11:00
cpu_setup_44x.S powerpc/44x: Add support for the AMCC APM821xx SoC 2010-10-13 08:47:09 -04:00
cpu_setup_a2.S powerpc: Enforce usage of RA 0-R31 where possible 2012-07-10 19:18:35 +10:00
cpu_setup_fsl_booke.S powerpc/booke: Add CPU_FTR_EMB_HV check for e5500. 2012-09-12 14:57:09 -05:00
cpu_setup_pa6t.S
cpu_setup_power.S powerpc/power8: Fix secondary CPUs hanging on boot for HV=0 2013-04-26 16:08:17 +10:00
cpu_setup_ppc970.S powerpc, KVM: Split HVMODE_206 cpu feature bit into separate HV and architecture bits 2011-07-12 13:16:58 +03:00
cputable.c powerpc: Fix cputable entry for 970MP rev 1.0 2013-03-13 10:06:46 +11:00
crash_dump.c powerpc: Rename mapping based RELOCATABLE to DYNAMIC_MEMSTART for BookE 2011-12-20 10:20:19 -05:00
crash.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
dbell.c powerpc: Add accounting for Doorbell interrupts 2013-04-18 15:59:55 +10:00
dma-iommu.c powerpc/dma-iommu: Fix IOMMU window check 2012-08-24 20:26:07 +10:00
dma-swiotlb.c powerpc/swiotlb: Enable at early stage and disable if not necessary 2012-09-12 14:57:09 -05:00
dma.c powerpc/kernel: Remove uses of abs_to_virt() and virt_to_abs() 2012-09-05 15:19:30 +10:00
entry_32.S powerpc: Fix MAX_STACK_TRACE_ENTRIES too low warning for ppc32 2013-01-29 10:10:22 +11:00
entry_64.S powerpc: add a missing label in resume_kernel 2013-04-15 17:29:48 +10:00
epapr_hcalls.S KVM: PPC: ev_idle hcall support for e500 guests 2012-10-05 23:38:37 +02:00
epapr_paravirt.c powerpc: define the conditions where the ePAPR idle hcall can be supported 2013-03-26 08:47:27 +11:00
exceptions-64e.S powerpc: Move branch instruction from ACCOUNT_CPU_USER_ENTRY to caller 2013-01-10 17:00:59 +11:00
exceptions-64s.S powerpc: Fix "attempt to move .org backwards" error 2013-04-26 16:08:27 +10:00
fadump.c powerpc: Change memory_limit from phys_addr_t to unsigned long long 2012-09-07 11:44:30 +10:00
firmware.c powerpc: fix implicit use of cache.h in kernel/firmware.c 2011-10-31 19:30:41 -04:00
fpu.S powerpc: Add FP/VSX and VMX register load functions for transactional memory 2013-02-15 16:58:52 +11:00
fsl_booke_entry_mapping.S
ftrace.c powerpc/ftrace: Trace function graph entry before updating index 2012-07-27 11:42:34 +10:00
head_8xx.S powerpc: Call do_page_fault() with interrupts off 2012-03-09 10:55:08 +11:00
head_32.S powerpc: Call do_page_fault() with interrupts off 2012-03-09 10:55:08 +11:00
head_40x.S powerpc: Enable the Watchdog vector for 405 2013-01-10 14:43:46 +11:00
head_44x.S Merge branch 'next' of git://git.kernel.org/pub/scm/virt/kvm/kvm 2012-05-24 16:17:30 -07:00
head_64.S powerpc: Add isync to copy_and_flush 2013-04-26 16:08:17 +10:00
head_booke.h KVM: PPC: booke: category E.HV (GS-mode) support 2012-04-08 12:51:19 +03:00
head_fsl_booke.S powepc/booke: Separate out E.HV check and ivor setup code. 2012-09-12 14:57:08 -05:00
hw_breakpoint.c powerpc: Change hardware breakpoint to allow longer ranges 2013-01-29 11:35:08 +11:00
ibmebus.c powerpc: Remove all includes of <asm/abs_addr.h> 2012-09-05 15:19:33 +10:00
idle_6xx.S powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly 2012-07-11 14:18:22 +10:00
idle_book3e.S powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly 2012-07-11 14:18:22 +10:00
idle_e500.S powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly 2012-07-11 14:18:22 +10:00
idle_power4.S powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly 2012-07-11 14:18:22 +10:00
idle_power7.S powerpc/powernv: Always go into nap mode when CPU is offline 2012-09-05 16:05:20 +10:00
idle.c powerpc: Remove no longer used ppc_md.idle_loop() 2012-11-15 13:00:20 +11:00
io-workarounds.c POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
io.c powerpc: various straight conversions from module.h --> export.h 2011-10-31 19:30:44 -04:00
iomap.c powerpc: switch to GENERIC_PCI_IOMAP 2011-11-28 21:13:18 +02:00
iommu.c powerpc: Use PTR_RET instead of IS_ERR/PTR_ERR 2013-04-18 13:03:48 +10:00
irq.c powerpc: Add accounting for Doorbell interrupts 2013-04-18 15:59:55 +10:00
isa-bridge.c POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
jump_label.c powerpc: Fix build breakage in jump_label.c 2011-11-16 14:25:19 +11:00
kgdb.c powerpc/kgdb: Removed kmalloc returned value cast 2013-04-18 13:03:56 +10:00
kprobes.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
kvm_emul.S KVM: PPC: Not optimizing MSR_CE and MSR_ME with paravirt. 2012-05-30 11:43:11 +02:00
kvm.c KVM: PPC: use definitions in epapr header for hcalls 2012-10-05 23:38:36 +02:00
l2cr_6xx.S Fix common misspellings 2011-03-31 11:26:23 -03:00
legacy_serial.c Fix misspellings of "whether" in comments. 2012-11-19 14:31:35 +01:00
lparcfg.c powerpc/pseries/lparcfg: Fix possible overflow are more than 1026 2013-04-23 16:39:35 +10:00
machine_kexec_32.c treewide: convert uses of ATTRIB_NORETURN to __noreturn 2012-01-12 20:13:03 -08:00
machine_kexec_64.c powerpc/kexec: Disable hard IRQ before kexec 2013-02-24 03:49:28 +11:00
machine_kexec.c powerpc+of: Rename the drivers/of prom_* functions to of_* 2012-11-15 12:56:52 +11:00
Makefile powerpc: Add helper functions for transactional memory context switching 2013-02-15 16:58:52 +11:00
misc_32.S powerpc: split ret_from_fork 2012-09-30 23:31:19 -04:00
misc_64.S powerpc: split ret_from_fork 2012-09-30 23:31:19 -04:00
misc.S powerpc: switch to generic sys_execve()/kernel_execve() 2012-09-30 23:35:51 -04:00
module_32.c powerpc: Fix kernel panic during kernel module load 2012-06-08 19:59:08 +10:00
module_64.c powerpc: Build kernel with -mcmodel=medium 2013-01-10 17:00:31 +11:00
module.c powerpc: remove non-required uses of include <linux/module.h> 2011-10-31 19:30:44 -04:00
msi.c
nvram_64.c powerpc: remove cast for kmalloc/kzalloc return value 2013-04-18 13:03:56 +10:00
of_platform.c powerpc/eeh: Fix crash when adding a device in a slot with DDW 2013-01-10 17:01:58 +11:00
paca.c powerpc: Move boot_paca into early_setup 2013-02-15 16:54:48 +11:00
pci_32.c POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
pci_64.c POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
pci_dn.c POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
pci_of_scan.c POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
pci-common.c powerpc: Set default VGA device 2013-04-18 15:59:58 +10:00
pmc.c bug.h: add include of it to various implicit C users 2012-02-29 17:15:08 -05:00
ppc32.h powerpc: switch to generic old sigaction() 2013-02-03 18:16:10 -05:00
ppc_ksyms.c Merge remote-tracking branch 'master' into queue 2012-10-29 19:15:32 -02:00
ppc_save_regs.S Fix common misspellings 2011-03-31 11:26:23 -03:00
proc_powerpc.c new helper: file_inode(file) 2013-02-22 23:31:31 -05:00
process.c Merge remote-tracking branch 'origin/master' into next 2013-04-24 14:43:36 +10:00
prom_init_check.sh powerpc: Relocate prom_init.c on 64bit 2013-01-10 17:00:25 +11:00
prom_init.c powerpc/pseries: Enable PRRN handling 2013-04-26 16:08:26 +10:00
prom_parse.c powerpc: remove non-required uses of include <linux/module.h> 2011-10-31 19:30:44 -04:00
prom.c Merge branch 'dt' into next 2012-11-15 15:02:44 +11:00
ptrace32.c powerpc: fixing ptrace_get_reg to return an error 2013-04-18 13:03:57 +10:00
ptrace.c powerpc/ptrace: Add DAWR debug feature info for userspace 2013-04-18 15:59:55 +10:00
reloc_32.S powerpc: Process dynamic relocations for kernel 2011-12-20 10:21:08 -05:00
reloc_64.S
rtas_flash.c powerpc/rtas_flash: New return code to indicate FW entitlement expiry 2013-04-24 14:22:31 +10:00
rtas_pci.c powerpc/kernel: Cleanup on rtas_pci.c 2013-04-18 13:03:48 +10:00
rtas-proc.c
rtas-rtc.c powerpc/rtas-rtc: remove sideeffects of printk_ratelimit 2011-06-29 15:30:43 +10:00
rtas.c powerpc+of: Remove the pSeries_reconfig.h file 2012-11-15 12:56:55 +11:00
rtasd.c powerpc/pseries: Add /proc interface to control topology updates 2013-04-26 16:08:26 +10:00
setup_32.c powerpc/watchdog: move booke watchdog param related code to setup-common.c 2012-07-11 07:44:03 -05:00
setup_64.c powerpc: Apply early paca fixups to boot_paca and the boot cpu's paca 2013-02-15 16:55:06 +11:00
setup-common.c powerpc: remove PReP platform 2013-04-18 13:03:53 +10:00
setup.h
signal_32.c powerpc: fix compiling CONFIG_PPC_TRANSACTIONAL_MEM when CONFIG_ALTIVEC=n 2013-04-10 08:14:39 +10:00
signal_64.c powerpc: fix compiling CONFIG_PPC_TRANSACTIONAL_MEM when CONFIG_ALTIVEC=n 2013-04-10 08:14:39 +10:00
signal.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2013-02-23 18:50:11 -08:00
signal.h powerpc: Add new transactional memory state to the signal context 2013-02-15 17:02:23 +11:00
smp-tbsync.c POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
smp.c powerpc: fix ics_rtas_init and start_secondary section mismatch 2013-02-08 14:05:48 +11:00
softemu8xx.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
stacktrace.c powerpc: various straight conversions from module.h --> export.h 2011-10-31 19:30:44 -04:00
suspend.c
swsusp_32.S Fix common misspellings 2011-03-31 11:26:23 -03:00
swsusp_64.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
swsusp_asm64.S
swsusp_booke.S
swsusp.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
sys_ppc32.c fix compat truncate/ftruncate 2013-02-25 09:24:55 -05:00
syscalls.c powerpc: Fix personality handling in ppc64_personality() 2012-08-24 20:26:07 +10:00
sysfs.c numa: convert static memory to dynamically allocated memory for per node device 2012-12-11 17:22:23 -08:00
systbl_chk.c
systbl_chk.sh
systbl.S
tau_6xx.c
time.c powerpc: Use PTR_RET instead of IS_ERR/PTR_ERR 2013-04-18 13:03:48 +10:00
tm.S powerpc: fix compiling CONFIG_PPC_TRANSACTIONAL_MEM when CONFIG_ALTIVEC=n 2013-04-10 08:14:39 +10:00
traps.c The sweeping change is to make add_taint() explicitly indicate whether to disable 2013-02-25 15:41:43 -08:00
udbg_16550.c powerpc: Add early debug for WSP platforms 2011-05-06 13:32:41 +10:00
udbg.c powerpc/udbg: Remove unused udbg_read() 2012-11-15 12:59:33 +11:00
uprobes.c uprobes/powerpc: Do not use arch_uprobe_*_step() helpers 2012-11-03 17:15:12 +01:00
vdso.c powerpc: Add VDSO version of time 2013-04-23 16:05:05 +10:00
vecemu.c
vector.S powerpc: Add FP/VSX and VMX register load functions for transactional memory 2013-02-15 16:58:52 +11:00
vio.c POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
vmlinux.lds.S powerpc: Relocate prom_init.c on 64bit 2013-01-10 17:00:25 +11:00