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linux/arch/powerpc/kernel
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Michael Ellerman 6eeb9b3b9c powerpc/64s: Fix section mismatch warnings from boot code 
We currently have two section mismatch warnings:

  The function __boot_from_prom() references
  the function __init prom_init().

  The function start_here_common() references
  the function __init start_kernel().

The warnings are correct, we do have branches from non-init code into
init code, which is freed after boot. But we don't expect to ever
execute any of that early boot code after boot, if we did that would
be a bug. In particular calling into OF after boot would be fatal
because OF is no longer resident.

So for now fix the warnings by marking the relevant functions as
__REF, which puts them in the ".ref.text" section.

This causes some reordering of the functions in the final link:

  @@ -217,10 +217,9 @@
   c00000000000b088 t generic_secondary_common_init
   c00000000000b124 t __mmu_off
   c00000000000b14c t __start_initialization_multiplatform
  -c00000000000b1ac t __boot_from_prom
  -c00000000000b1ec t __after_prom_start
  -c00000000000b260 t p_end
  -c00000000000b27c T copy_and_flush
  +c00000000000b1ac t __after_prom_start
  +c00000000000b220 t p_end
  +c00000000000b23c T copy_and_flush
   c00000000000b300 T __secondary_start
   c00000000000b300 t copy_to_here
   c00000000000b344 t start_secondary_prolog
  @@ -228,8 +227,9 @@
   c00000000000b36c t enable_64b_mode
   c00000000000b388 T relative_toc
   c00000000000b3a8 t p_toc
  -c00000000000b3b0 t start_here_common
  -c00000000000b3d0 t start_here_multiplatform
  +c00000000000b3b0 t __boot_from_prom
  +c00000000000b3f0 t start_here_multiplatform
  +c00000000000b480 t start_here_common
   c00000000000b880 T system_call_common
   c00000000000b974 t system_call
   c00000000000b9dc t system_call_exit

In particular __boot_from_prom moves after copy_to_here, which means
it's not copied to zero in the first stage of copy of the kernel to
zero.

But that's OK, because we only call __boot_from_prom before we do the
copy, so it makes no difference when it's copied. The call sequence
is:
  __start
  -> __start_initialization_multiplatform
     -> __boot_from_prom
        -> __start
           -> __start_initialization_multiplatform
              -> __after_prom_start
                 -> copy_and_flush
                 -> copy_and_flush (relocated to 0)
                    -> start_here_multiplatform
                       -> early_setup

Reported-by: Mauricio Faria de Oliveira <mauricfo@linux.ibm.com>
Reported-by: Roman Bolshakov <r.bolshakov@yadro.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200225031328.14676-1-mpe@ellerman.id.au
2020-03-25 12:07:59 +11:00
..
syscalls threads-v5.6 2020-01-29 19:38:34 -08:00
trace powerpc/ftrace: Enable HAVE_FUNCTION_GRAPH_RET_ADDR_PTR 2019-09-18 12:24:55 +10:00
vdso32 powerpc/vdso32: miscellaneous optimisations 2020-01-23 21:31:16 +11:00
vdso64 powerpc: Fix vDSO clock_getres() 2019-12-05 00:13:55 +11:00
.gitignore powerpc: improve prom_init_check rule 2019-09-14 00:04:41 +10:00
align.c powerpc/spe: Mark expected switch fall-throughs 2019-07-31 00:19:34 +10:00
asm-offsets.c powerpc/32s: Fix DSI and ISI exceptions for CONFIG_VMAP_STACK 2020-02-18 21:31:11 +11:00
audit.c
btext.c powerpc: Rework btext_find_display to use of_stdout and device_type helpers 2018-11-26 22:33:37 +11:00
cacheinfo.c powerpc updates for 5.3 2019-07-13 16:08:36 -07:00
cacheinfo.h powerpc/cacheinfo: add cacheinfo_teardown, cacheinfo_rebuild 2019-06-15 16:52:06 +10:00
compat_audit.c
cpu_setup_6xx.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
cpu_setup_44x.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
cpu_setup_fsl_booke.S powerpc/booke: Spelling s/date/data/ 2019-11-17 01:56:31 -06:00
cpu_setup_pa6t.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
cpu_setup_power.S powerpc/64s: Set reserved PCR bits 2019-09-21 08:36:53 +10:00
cpu_setup_ppc970.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
cputable.c powerpc: fix hardware PMU exception bug on PowerVM compatibility mode systems 2020-02-28 10:09:33 +11:00
crash_dump.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 230 2019-06-19 17:09:06 +02:00
dawr.c powerpc/watchpoint: Fix length calculation for unaligned target 2019-11-13 16:58:03 +11:00
dbell.c KVM: PPC: Book3S HV: use smp_mb() when setting/clearing host_ipi flag 2019-09-24 12:46:26 +10:00
dma-iommu.c powerpc updates for 5.4 2019-09-20 11:48:06 -07:00
dma-mask.c dma-mapping, powerpc: simplify the arch dma_set_mask override 2019-02-18 22:41:03 +11:00
dma-swiotlb.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
dt_cpu_ftrs.c powerpc/mm: Remove kvm radix prefetch workaround for Power9 DD2.2 2020-01-26 00:11:37 +11:00
early_32.c powerpc/fsl_booke/32: implement KASLR infrastructure 2019-11-13 19:27:40 +11:00
eeh_cache.c powerpc/eeh_cache: Don't use pci_dn when inserting new ranges 2020-01-23 21:31:18 +11:00
eeh_dev.c powerpc/eeh: Add bdfn field to eeh_dev 2019-08-22 23:12:46 +10:00
eeh_driver.c powerpc/eeh: Fix deadlock handling dead PHB 2020-02-17 12:47:05 +11:00
eeh_event.c powerpc/eeh: Fix build with STACKTRACE=n 2019-09-14 00:01:14 +10:00
eeh_pe.c powerpc/eeh: Clean up EEH PEs after recovery finishes 2019-09-05 14:22:37 +10:00
eeh_sysfs.c powerpc/eeh_sysfs: Make clearing EEH_DEV_SYSFS saner 2020-01-23 21:31:19 +11:00
eeh.c powerpc/eeh: Only dump stack once if an MMIO loop is detected 2020-01-23 21:31:20 +11:00
entry_32.S Merge branch 'fixes' into next 2020-03-10 15:16:42 +11:00
entry_64.S powerpc updates for 5.6 2020-02-04 13:06:46 +00:00
epapr_hcalls.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
epapr_paravirt.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
exceptions-64e.S powerpc: unify definition of M_IF_NEEDED 2019-11-13 19:27:24 +11:00
exceptions-64s.S powerpc: Provide initial documentation for PAPR hcalls 2020-01-29 21:30:50 +11:00
fadump.c powerpc/kernel: no need to check return value of debugfs_create functions 2020-03-04 22:44:25 +11:00
firmware.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
fpu.S powerpc/32s: Enable CONFIG_VMAP_STACK 2020-01-27 22:37:24 +11:00
fsl_booke_entry_mapping.S powerpc/fsl_booke/32: implement KASLR infrastructure 2019-11-13 19:27:40 +11:00
head_8xx.S powerpc/8xx: Fix clearing of bits 20-23 in ITLB miss 2020-02-17 12:47:06 +11:00
head_32.h Merge branch 'fixes' into next 2020-03-10 15:16:42 +11:00
head_32.S powerpc/32s: Fix DSI and ISI exceptions for CONFIG_VMAP_STACK 2020-02-18 21:31:11 +11:00
head_40x.S powerpc/32: save DEAR/DAR before calling handle_page_fault 2020-01-26 22:15:09 +11:00
head_44x.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
head_64.S powerpc/64s: Fix section mismatch warnings from boot code 2020-03-25 12:07:59 +11:00
head_booke.h powerpc/32: Warn and return ENOSYS on syscalls from kernel 2020-02-19 22:46:08 +11:00
head_fsl_booke.S powerpc/32: save DEAR/DAR before calling handle_page_fault 2020-01-26 22:15:09 +11:00
hw_breakpoint.c powerpc/watchpoint: Don't call dar_within_range() for Book3S 2020-02-24 11:19:35 +11:00
idle_6xx.S powerpc/6xx: Fix power_save_ppc32_restore() with CONFIG_VMAP_STACK 2020-02-18 21:31:12 +11:00
idle_book3e.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
idle_book3s.S powerpc/64s: Reimplement power4_idle code in C 2020-01-16 14:59:37 +10:00
idle_e500.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
idle.c powerpc/64s: Reimplement power4_idle code in C 2020-01-16 14:59:37 +10:00
ima_arch.c powerpc/ima: Indicate kernel modules appended signatures are enforced 2019-11-12 12:25:50 +11:00
io-workarounds.c powerpc/mm: rework io-workaround invocation. 2019-08-27 13:03:34 +10:00
io.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
iomap.c
iommu.c Merge branch 'topic/ppc-kvm' into next 2019-08-30 09:52:57 +10:00
irq.c powerpc/irq: Use current_stack_pointer in do_IRQ() 2020-03-04 22:44:30 +11:00
isa-bridge.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
jump_label.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
kgdb.c powerpc: Activate CONFIG_THREAD_INFO_IN_TASK 2019-02-23 22:31:40 +11:00
kprobes-ftrace.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
kprobes.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
kvm_emul.S powerpc/kvm: Add ifdefs around template code 2019-09-14 00:04:40 +10:00
kvm.c powerpc/kvm: Explicitly mark kvm guest code as __init 2019-09-14 00:04:40 +10:00
l2cr_6xx.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
legacy_serial.c tty/serial: Migrate 8250_fsl to use has_sysrq 2019-12-18 15:04:42 +01:00
Makefile powerpc/64s: Reimplement power4_idle code in C 2020-01-16 14:59:37 +10:00
mce_power.c powerpc/mm/mce: Keep irqs disabled during lockless page table walk 2019-09-19 21:24:59 +10:00
mce.c powerpc/64s/pseries: machine check convert to use common event code 2019-08-30 10:32:35 +10:00
misc_32.S powerpc/32: Split kexec low level code out of misc_32.S 2019-11-21 15:41:34 +11:00
misc_64.S Merge branch 'topic/kaslr-book3e32' into next 2019-11-14 19:23:33 +11:00
misc.S powerpc: Rename current_stack_pointer() to current_stack_frame() 2020-03-04 22:44:28 +11:00
module_32.c powerpc updates for 5.3 2019-07-13 16:08:36 -07:00
module_64.c powerpc updates for 5.3 2019-07-13 16:08:36 -07:00
module.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
module.lds
msi.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
note.S powerpc: Add PowerPC Capabilities ELF note 2019-08-30 09:40:15 +10:00
nvram_64.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
of_platform.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
optprobes_head.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
optprobes.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
paca.c powerpc/pseries/svm: Use shared memory for LPPACA structures 2019-08-30 09:55:40 +10:00
pci_32.c powerpc/64: Adjust order in pcibios_init() 2019-08-22 23:11:48 +10:00
pci_64.c powerpc/64: Adjust order in pcibios_init() 2019-08-22 23:11:48 +10:00
pci_dn.c powerpc/pcidn: Warn when sriov pci_dn management is used incorrectly 2020-01-23 21:31:19 +11:00
pci_of_scan.c powerpc/pci: Remove pcibios_setup_bus_devices() 2020-01-06 16:25:29 +11:00
pci-common.c powerpc/pci: Fold pcibios_setup_device() into pcibios_bus_add_device() 2020-01-23 21:31:21 +11:00
pci-hotplug.c powerpc/pci: Remove pcibios_setup_bus_devices() 2020-01-06 16:25:29 +11:00
pmc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
ppc32.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
ppc_save_regs.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
proc_powerpc.c proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
process.c powerpc: Rename current_stack_pointer() to current_stack_frame() 2020-03-04 22:44:28 +11:00
prom_init_check.sh powerpc/prom_init: Undo relocation before entering secure mode 2019-10-29 15:12:17 +11:00
prom_init.c powerpc/prom_init: Pass the "os-term" message to hypervisor 2020-03-25 12:07:58 +11:00
prom_parse.c
prom.c powerpc/fadump: add support to preserve crash data on FADUMP disabled kernel 2019-09-14 00:04:45 +10:00
ptrace32.c
ptrace.c powerpc/watchpoint: Fix ptrace code that muck around with address/len 2019-11-13 16:58:03 +11:00
reloc_32.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
reloc_64.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
rtas_flash.c proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
rtas_pci.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
rtas-proc.c proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
rtas-rtc.c powerpc: use time64_t in read_persistent_clock 2018-06-03 20:43:33 +10:00
rtas.c powerpc/rtas: allow rescheduling while changing cpu states 2019-08-20 21:22:27 +10:00
rtasd.c proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
secure_boot.c powerpc: Detect the trusted boot state of the system 2019-11-12 12:25:49 +11:00
security.c powerpc updates for 5.5 2019-11-30 14:35:43 -08:00
secvar-ops.c powerpc/powernv: Add OPAL API interface to access secure variable 2019-11-13 00:33:22 +11:00
secvar-sysfs.c powerpc: expose secure variables to userspace via sysfs 2019-11-13 00:33:22 +11:00
setup_32.c powerpc/32: Use vmapped stacks for interrupts 2020-01-27 22:36:15 +11:00
setup_64.c powerpc: align stack to 2 * THREAD_SIZE with VMAP_STACK 2020-01-26 22:15:09 +11:00
setup-common.c powerpc/kernel: no need to check return value of debugfs_create functions 2020-03-04 22:44:25 +11:00
setup.h powerpc/32: Add early stack overflow detection with VMAP stack. 2020-01-27 22:35:49 +11:00
signal_32.c powerpc/tm: Fix clearing MSR[TS] in current when reclaiming on signal delivery 2020-02-18 21:30:42 +11:00
signal_64.c powerpc/tm: Fix clearing MSR[TS] in current when reclaiming on signal delivery 2020-02-18 21:30:42 +11:00
signal.c powerpc/tm: Fix clearing MSR[TS] in current when reclaiming on signal delivery 2020-02-18 21:30:42 +11:00
signal.h
smp-tbsync.c
smp.c powerpc/numa: Remove late request for home node associativity 2020-03-04 22:44:31 +11:00
stacktrace.c powerpc: Rename current_stack_pointer() to current_stack_frame() 2020-03-04 22:44:28 +11:00
suspend.c PM: hibernate: powerpc: Expose pfn_is_nosave() prototype 2019-06-14 10:48:56 +02:00
swsusp_32.S powerpc/32s: fix suspend/resume when IBATs 4-7 are used 2019-06-19 20:05:07 +10:00
swsusp_64.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 505 2019-06-19 17:11:22 +02:00
swsusp_asm64.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 505 2019-06-19 17:11:22 +02:00
swsusp_booke.S
swsusp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
sys_ppc32.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
syscalls.c y2038: syscalls: change remaining timeval to __kernel_old_timeval 2019-11-15 14:38:29 +01:00
sysfs.c powerpc/kernel/sysfs: Add new config option PMU_SYSFS to enable PMU SPRs sysfs file creation 2020-03-04 22:44:28 +11:00
systbl_chk.sh treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
systbl.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
tau_6xx.c powerpc/tau: Make some function static 2018-05-25 12:04:44 +10:00
time.c powerpc: Fix vDSO clock_getres() 2019-12-05 00:13:55 +11:00
tm.S powerpc/tm: update comment about interrupt re-entrancy 2019-07-02 21:39:49 +10:00
traps.c powerpc/kernel: no need to check return value of debugfs_create functions 2020-03-04 22:44:25 +11:00
ucall.S powerpc/kernel: Add ucall_norets() ultravisor call handler 2019-08-30 09:40:15 +10:00
udbg_16550.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
udbg.c powerpc/udbg: Make it safe to call udbg_printf() always 2019-10-11 19:33:25 +11:00
uprobes.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
vdso.c powerpc/vdso: remove deprecated VDS64_HAS_DESCRIPTORS references 2020-03-13 21:13:06 +11:00
vecemu.c powerpc: Add a missing include header 2018-05-25 12:04:46 +10:00
vector.S powerpc/32s: Enable CONFIG_VMAP_STACK 2020-01-27 22:37:24 +11:00
vmlinux.lds.S powerpc: Include .BTF section 2020-02-24 22:04:07 +11:00
watchdog.c powerpc/watchdog: Use hrtimers for per-CPU heartbeat 2019-04-30 11:31:02 +10:00