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linux/arch/powerpc/kernel
History
Christophe Leroy b49e578b93 Revert "powerpc/bug: Provide better flexibility to WARN_ON/__WARN_FLAGS() with asm goto" 
This partly reverts commit 1e688dd2a3.

That commit aimed at optimising the code around generation of
WARN_ON/BUG_ON but this leads to a lot of dead code erroneously
generated by GCC.

That dead code becomes a problem when we start using objtool validation
because objtool will abort validation with a warning as soon as it
detects unreachable code. This is because unreachable code might
be the indication that objtool doesn't properly decode object text.

     text	   data	    bss	    dec	    hex	filename
  9551585	3627834	 224376	13403795	 cc8693	vmlinux.before
  9535281	3628358	 224376	13388015	 cc48ef	vmlinux.after

Once this change is reverted, in a standard configuration (pmac32 +
function tracer) the text is reduced by 16k which is around 1.7%

We already had problem with it when starting to use objtool on powerpc
as a replacement for recordmcount, see commit 93e3f45a26 ("powerpc:
Fix __WARN_FLAGS() for use with Objtool")

There is also a problem with at least GCC 12, on ppc64_defconfig +
CONFIG_CC_OPTIMIZE_FOR_SIZE=y + CONFIG_DEBUG_SECTION_MISMATCH=y :

    LD      .tmp_vmlinux.kallsyms1
  powerpc64-linux-ld: net/ipv4/tcp_input.o:(__ex_table+0xc4): undefined reference to `.L2136'
  make[2]: *** [scripts/Makefile.vmlinux:36: vmlinux] Error 1
  make[1]: *** [/home/chleroy/linux-powerpc/Makefile:1238: vmlinux] Error 2

Taking into account that other problems are encountered with that
'asm goto' in WARN_ON(), including build failures, keeping that
change is not worth it allthough it is primarily a compiler bug.

Revert it for now.

mpe: Retain EMIT_WARN_ENTRY as a synonym for EMIT_BUG_ENTRY to reduce
churn, as there are now nearly as many uses of EMIT_WARN_ENTRY as
EMIT_BUG_ENTRY.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Acked-by: Naveen N Rao <naveen@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230712134552.534955-1-mpe@ellerman.id.au
2023-07-17 10:35:28 +10:00
..
ptrace powerpc/ptrace: Expose HASHKEYR register to ptrace 2023-06-19 17:36:27 +10:00
syscalls cachestat: wire up cachestat for other architectures 2023-06-09 16:25:16 -07:00
trace powerpc/64: vmlinux support building with PCREL addresing 2023-04-20 12:59:21 +10:00
vdso Kbuild updates for v6.5 2023-07-01 09:24:31 -07:00
.gitignore
85xx_entry_mapping.S powerpc: Remove CONFIG_FSL_BOOKE 2022-09-26 22:47:37 +10:00
align.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
asm-offsets.c powerpc/64: vmlinux support building with PCREL addresing 2023-04-20 12:59:21 +10:00
audit.c Revert "powerpc/audit: Convert powerpc to AUDIT_ARCH_COMPAT_GENERIC" 2021-10-27 22:30:32 +11:00
btext.c powerpc: Use of_property_read_bool() for boolean properties 2023-03-30 23:36:35 +11:00
cacheinfo.c powerpc: Remove asm/prom.h from all files that don't need it 2022-05-08 22:15:04 +10:00
cacheinfo.h
compat_audit.c Revert "powerpc/audit: Convert powerpc to AUDIT_ARCH_COMPAT_GENERIC" 2021-10-27 22:30:32 +11:00
cpu_setup_6xx.S powerpc/32: Fix objtool unannotated intra-function call warnings 2022-11-18 19:00:06 +11:00
cpu_setup_44x.S
cpu_setup_e500.S powerpc/32: Fix objtool unannotated intra-function call warnings 2022-11-18 19:00:06 +11:00
cpu_setup_pa6t.S
cpu_setup_power.c powerpc/dexcr: Add initial Dynamic Execution Control Register (DEXCR) support 2023-06-19 17:36:25 +10:00
cpu_setup_ppc970.S
cpu_specs_8xx.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_40x.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_44x.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_47x.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_85xx.h powerpc/cputable: Split cpu_specs[] for mpc85xx and e500mc 2022-09-26 23:00:05 +10:00
cpu_specs_book3s_32.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_book3s_64.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_e500mc.h powerpc/cputable: Split cpu_specs[] for mpc85xx and e500mc 2022-09-26 23:00:05 +10:00
cpu_specs.h powerpc/cputable: Split cpu_specs[] for mpc85xx and e500mc 2022-09-26 23:00:05 +10:00
cputable.c powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
crash_dump.c powerpc updates for 5.19 2022-05-28 11:27:17 -07:00
dawr.c powerpc: Include asm/firmware.h in all users of firmware_has_feature() 2022-06-29 16:45:05 +10:00
dbell.c powerpc/64: Fix perf profiling asynchronous interrupt handlers 2023-01-30 20:07:42 +11:00
dma-iommu.c powerpc/iommu: Incorrect DDW Table is referenced for SR-IOV device 2023-05-17 00:54:55 +10:00
dma-mask.c
dma-swiotlb.c swiotlb: add a SWIOTLB_ANY flag to lift the low memory restriction 2022-04-18 07:21:12 +02:00
dt_cpu_ftrs.c powerpc: move from strlcpy with unused retval to strscpy 2022-08-26 11:02:20 +10:00
early_32.c powerpc: Move C prototypes out of asm-prototypes.h 2022-03-08 22:06:25 +11:00
eeh_cache.c powerpc/kernel: Add __init attribute to eligible functions 2021-12-23 22:33:10 +11:00
eeh_driver.c powerpc/eeh: Set channel state after notifying the drivers 2023-02-15 22:41:11 +11:00
eeh_event.c powerpc: fix typos in comments 2022-05-05 22:12:44 +10:00
eeh_pe.c powerpc/eeh: Rely on dev->link_active_reporting 2023-06-14 17:58:12 -05:00
eeh_sysfs.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
eeh.c powerpc: fix typos in comments 2022-05-05 22:12:44 +10:00
entry_32.S powerpc: merge 32-bit and 64-bit _switch implementation 2023-06-15 14:03:55 +10:00
epapr_hcalls.S powerpc/epapr: Don't use wrteei on non booke 2023-02-17 22:07:04 +11:00
epapr_paravirt.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
exceptions-64e.S powerpc/64e: Fix obtool warnings in exceptions-64e.S 2023-07-10 09:47:47 +10:00
exceptions-64s.S powerpc: add CFUNC assembly label annotation 2023-04-20 12:54:24 +10:00
fadump.c powerpc updates for 5.19 2022-05-28 11:27:17 -07:00
firmware.c powerpc: fix unbalanced node refcount in check_kvm_guest() 2021-10-09 00:15:59 +11:00
fpu.S powerpc/64s/interrupt: handle MSR EE and RI in interrupt entry wrapper 2021-12-16 21:31:45 +11:00
head_8xx.S Merge branch 'topic/objtool' into next 2022-12-08 23:57:47 +11:00
head_32.h powerpc: add a definition for the marker offset within the interrupt frame 2022-12-02 17:54:08 +11:00
head_40x.S Merge branch 'topic/objtool' into next 2022-12-08 23:57:47 +11:00
head_44x.S powerpc: allow minimum sized kernel stack frames 2022-12-02 17:54:09 +11:00
head_64.S powerpc/64: vmlinux support building with PCREL addresing 2023-04-20 12:59:21 +10:00
head_85xx.S powerpc/85xx: Fix unannotated intra-function call warning 2023-01-30 15:59:59 +11:00
head_book3s_32.S Merge branch 'topic/objtool' into next 2022-12-08 23:57:47 +11:00
head_booke.h powerpc/32: Include thread_info.h in head_booke.h 2023-04-11 23:13:33 +10:00
hw_breakpoint_constraints.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
hw_breakpoint.c powerpc/8xx: Fix warning in hw_breakpoint_handler() 2022-11-24 23:31:49 +11:00
idle_6xx.S powerpc/mm: Switch obsolete dssall to .long 2021-12-23 22:35:13 +11:00
idle_64e.S powerpc: add ISA v3.0 / v3.1 wait opcode macro 2022-09-28 19:22:10 +10:00
idle_85xx.S powerpc: Cleanup idle for e500 2022-09-26 23:00:14 +10:00
idle_book3s.S powerpc/idle: Don't corrupt back chain when going idle 2021-10-20 21:37:58 +11:00
idle.c powerpc: Simplify sysctl registration for powersave_nap_ctl_table 2023-03-16 15:18:12 +11:00
ima_arch.c
interrupt_64.S powerpc: Fix merge conflict between pcrel and copy_thread changes 2023-04-26 16:20:16 +10:00
interrupt.c powerpc: Mark [h]ssr_valid accesses in check_return_regs_valid 2023-06-21 15:13:57 +10:00
io-workarounds.c
io.c
iomap.c
iommu.c powerpc/iommu: Only build sPAPR access functions on pSeries 2023-06-21 15:13:57 +10:00
irq_64.c powerpc/64: Don't call trace_hardirqs_on() in prep_irq_for_idle() 2023-04-20 13:21:49 +10:00
irq.c powerpc/64: vmlinux support building with PCREL addresing 2023-04-20 12:59:21 +10:00
isa-bridge.c powerpc/isa-bridge: Fix ISA mapping when "ranges" is not present 2023-05-08 22:57:10 +10:00
jump_label.c
kdebugfs.c powerpc: rename powerpc_debugfs_root to arch_debugfs_dir 2021-08-13 22:04:26 +10:00
kgdb.c powerpc: add definition for pt_regs offset within an interrupt frame 2022-12-02 17:54:08 +11:00
kprobes-ftrace.c ftrace: disable preemption when recursion locked 2021-10-27 11:21:49 -04:00
kprobes.c powerpc updates for 6.2 2022-12-19 07:13:33 -06:00
kvm_emul.S
kvm.c powerpc: Remove CONFIG_PPC_BOOK3E_MMU 2022-09-26 23:00:14 +10:00
l2cr_6xx.S powerpc/mm: Switch obsolete dssall to .long 2021-12-23 22:35:13 +11:00
legacy_serial.c powerpc/legacy_serial: Handle SERIAL_8250_FSL=n build failures 2023-06-13 12:27:04 +02:00
Makefile powerpc/64: Rename entry_64.S to prom_entry_64.S 2023-06-15 14:04:19 +10:00
mce_power.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
mce.c powerpc/mce: log the error for all unrecoverable errors 2023-02-10 22:17:34 +11:00
misc_32.S powerpc: allow minimum sized kernel stack frames 2022-12-02 17:54:09 +11:00
misc_64.S powerpc: add CFUNC assembly label annotation 2023-04-20 12:54:24 +10:00
misc.S powerpc: Avoid link stack corruption in misc asm functions 2021-08-25 13:35:47 +10:00
module_32.c module: replace module_layout with module_memory 2023-03-09 12:55:15 -08:00
module_64.c powerpc/64: modules support building with PCREL addresing 2023-04-20 13:21:42 +10:00
module.c powerpc: Replace PPC64_ELF_ABI_v{1/2} by CONFIG_PPC64_ELF_ABI_V{1/2} 2022-05-19 23:11:29 +10:00
msi.c
note.S
nvram_64.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
of_platform.c
optprobes_head.S powerpc: add definition for pt_regs offset within an interrupt frame 2022-12-02 17:54:08 +11:00
optprobes.c powerpc/kprobes: Have optimized_callback() use preempt_enable() 2022-11-24 23:31:49 +11:00
paca.c powerpc/64: vmlinux support building with PCREL addresing 2023-04-20 12:59:21 +10:00
pci_32.c powerpc/pci: Add option for using pci_to_OF_bus_map 2023-02-07 20:15:23 +11:00
pci_64.c powerpc/pci_64: Init pcibios subsys a bit later 2023-03-14 23:36:27 +11:00
pci_dn.c powerpc/pci_dn: Add missing of_node_put() 2022-09-05 17:30:25 +10:00
pci_of_scan.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
pci-common.c PCI: Introduce pci_dev_for_each_resource() 2023-04-04 10:43:52 -05:00
pci-hotplug.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
pmc.c
ppc_save_regs.S powerpc: update ppc_save_regs to save current r1 in pt_regs 2023-06-19 17:37:14 +10:00
proc_powerpc.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
process.c powerpc/dexcr: Support userspace ROP protection 2023-06-19 17:36:26 +10:00
prom_entry_64.S powerpc/64: Rename entry_64.S to prom_entry_64.S 2023-06-15 14:04:19 +10:00
prom_init_check.sh kasan, powerpc: don't rename memintrinsics if compiler adds prefixes 2023-03-23 17:18:33 -07:00
prom_init.c powerpc/prom_init: drop PROM_BUG() 2022-09-26 20:58:18 +10:00
prom_parse.c
prom.c powerpc/dexcr: Add initial Dynamic Execution Control Register (DEXCR) support 2023-06-19 17:36:25 +10:00
reloc_32.S powerpc: Avoid link stack corruption in misc asm functions 2021-08-25 13:35:47 +10:00
reloc_64.S powerpc/64: avoid using r13 in relocate 2022-09-28 19:22:13 +10:00
rtas_entry.S powerpc/rtas: Fix RTAS MSR[HV] handling for Cell 2022-08-26 08:41:54 +10:00
rtas_flash.c powerpc/rtas: arch-wide function token lookup conversions 2023-02-13 22:35:03 +11:00
rtas_pci.c powerpc/rtas: arch-wide function token lookup conversions 2023-02-13 22:35:03 +11:00
rtas-proc.c powerpc/rtas: arch-wide function token lookup conversions 2023-02-13 22:35:03 +11:00
rtas-rtc.c powerpc/rtas: arch-wide function token lookup conversions 2023-02-13 22:35:03 +11:00
rtas.c powerpc/rtas: lockdep annotations 2023-03-30 23:36:35 +11:00
rtasd.c powerpc/rtas: arch-wide function token lookup conversions 2023-02-13 22:35:03 +11:00
secure_boot.c
security.c powerpc/security: Fix Speculation_Store_Bypass reporting on Power10 2023-07-10 09:47:47 +10:00
secvar-ops.c powerpc/secvar: Warn and error if multiple secvar ops are set 2023-02-12 22:12:36 +11:00
secvar-sysfs.c powerpc/secvar: Don't print error on ENOENT when reading variables 2023-02-12 22:12:37 +11:00
setup_32.c powerpc: Change CONFIG_E500 to CONFIG_PPC_E500 2022-09-26 23:00:13 +10:00
setup_64.c cpu: Mark panic_smp_self_stop() __noreturn 2023-04-14 17:31:25 +02:00
setup-common.c powerpc/machdep: Define 'compatible' property in ppc_md and use it 2023-03-15 00:52:10 +11:00
setup.h powerpc: Remove CONFIG_PPC_BOOK3E 2022-09-26 23:00:13 +10:00
signal_32.c powerpc/signal32: Force inlining of __unsafe_save_user_regs() and save_tm_user_regs_unsafe() 2023-06-09 23:29:51 +10:00
signal_64.c powerpc/signal: Update comment for clarity 2022-07-28 16:22:14 +10:00
signal.c powerpc/signal: Report minimum signal frame size to userspace via AT_MINSIGSTKSZ 2022-05-19 23:11:26 +10:00
signal.h powerpc: Don't add __powerpc_ prefix to syscall entry points 2022-10-07 00:59:54 +11:00
smp-tbsync.c
smp.c powerpc updates for 6.5 2023-06-30 09:20:08 -07:00
stacktrace.c powerpc: allow minimum sized kernel stack frames 2022-12-02 17:54:09 +11:00
static_call.c powerpc/32: Add support for out-of-line static calls 2021-10-22 15:22:05 +11:00
suspend.c
switch.S powerpc: merge 32-bit and 64-bit _switch implementation 2023-06-15 14:03:55 +10:00
swsusp_32.S powerpc/32: Fix objtool unannotated intra-function call warnings 2022-11-18 19:00:06 +11:00
swsusp_64.c powerpc/machdep: Remove stale functions from ppc_md structure 2021-10-22 15:22:05 +11:00
swsusp_85xx.S powerpc: Remove CONFIG_FSL_BOOKE 2022-09-26 22:47:37 +10:00
swsusp_asm64.S powerpc/64: asm use consistent global variable declaration and access 2022-09-28 19:22:12 +10:00
swsusp.c
sys_ppc32.c powerpc/32: fix syscall wrappers with 64-bit arguments 2022-11-01 10:24:09 +11:00
syscall.c powerpc: Provide syscall wrapper 2022-09-28 19:22:09 +10:00
syscalls.c powerpc: Adopt SYSCALL_DEFINE for arch-specific syscall handlers 2022-09-28 19:22:08 +10:00
sysfs.c powerpc/sysfs: move to use bus_get_dev_root() 2023-03-17 15:29:34 +01:00
systbl.c powerpc: Don't add __powerpc_ prefix to syscall entry points 2022-10-07 00:59:54 +11:00
tau_6xx.c powerpc, workqueue: Use alloc_ordered_workqueue() to create ordered workqueues 2023-05-08 13:52:27 -10:00
time.c powerpc: Make generic_calibrate_decr() the default 2023-03-16 08:56:48 +11:00
tm.S powerpc: add definition for pt_regs offset within an interrupt frame 2022-12-02 17:54:08 +11:00
traps.c Revert "powerpc/bug: Provide better flexibility to WARN_ON/__WARN_FLAGS() with asm goto" 2023-07-17 10:35:28 +10:00
ucall.S
udbg_16550.c powerpc: Add support for early debugging via Serial 16550 console 2022-09-28 19:22:09 +10:00
udbg.c powerpc: Add support for early debugging via Serial 16550 console 2022-09-28 19:22:09 +10:00
uprobes.c powerpc: Reject probes on instructions that can't be single stepped 2022-05-06 00:00:20 +10:00
vdso32_wrapper.S powerpc/vdso: Merge vdso64 and vdso32 into a single directory 2022-02-12 22:47:43 +11:00
vdso64_wrapper.S powerpc/vdso: Merge vdso64 and vdso32 into a single directory 2022-02-12 22:47:43 +11:00
vdso.c mm: remove zap_page_range and create zap_vma_pages 2023-01-18 17:12:55 -08:00
vecemu.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
vector.S powerpc/64: vmlinux support building with PCREL addresing 2023-04-20 12:59:21 +10:00
vmlinux.lds.S powerpc/64: vmlinux support building with PCREL addresing 2023-04-20 12:59:21 +10:00
watchdog.c watchdog/hardlockup: rename some "NMI watchdog" constants/function 2023-06-09 17:44:20 -07:00