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Christophe Leroy 1e688dd2a3 powerpc/bug: Provide better flexibility to WARN_ON/__WARN_FLAGS() with asm goto 
Using asm goto in __WARN_FLAGS() and WARN_ON() allows more
flexibility to GCC.

For that add an entry to the exception table so that
program_check_exception() knowns where to resume execution
after a WARNING.

Here are two exemples. The first one is done on PPC32 (which
benefits from the previous patch), the second is on PPC64.

	unsigned long test(struct pt_regs *regs)
	{
		int ret;

		WARN_ON(regs->msr & MSR_PR);

		return regs->gpr[3];
	}

	unsigned long test9w(unsigned long a, unsigned long b)
	{
		if (WARN_ON(!b))
			return 0;
		return a / b;
	}

Before the patch:

	000003a8 <test>:
	 3a8:	81 23 00 84 	lwz     r9,132(r3)
	 3ac:	71 29 40 00 	andi.   r9,r9,16384
	 3b0:	40 82 00 0c 	bne     3bc <test+0x14>
	 3b4:	80 63 00 0c 	lwz     r3,12(r3)
	 3b8:	4e 80 00 20 	blr

	 3bc:	0f e0 00 00 	twui    r0,0
	 3c0:	80 63 00 0c 	lwz     r3,12(r3)
	 3c4:	4e 80 00 20 	blr

	0000000000000bf0 <.test9w>:
	 bf0:	7c 89 00 74 	cntlzd  r9,r4
	 bf4:	79 29 d1 82 	rldicl  r9,r9,58,6
	 bf8:	0b 09 00 00 	tdnei   r9,0
	 bfc:	2c 24 00 00 	cmpdi   r4,0
	 c00:	41 82 00 0c 	beq     c0c <.test9w+0x1c>
	 c04:	7c 63 23 92 	divdu   r3,r3,r4
	 c08:	4e 80 00 20 	blr

	 c0c:	38 60 00 00 	li      r3,0
	 c10:	4e 80 00 20 	blr

After the patch:

	000003a8 <test>:
	 3a8:	81 23 00 84 	lwz     r9,132(r3)
	 3ac:	71 29 40 00 	andi.   r9,r9,16384
	 3b0:	40 82 00 0c 	bne     3bc <test+0x14>
	 3b4:	80 63 00 0c 	lwz     r3,12(r3)
	 3b8:	4e 80 00 20 	blr

	 3bc:	0f e0 00 00 	twui    r0,0

	0000000000000c50 <.test9w>:
	 c50:	7c 89 00 74 	cntlzd  r9,r4
	 c54:	79 29 d1 82 	rldicl  r9,r9,58,6
	 c58:	0b 09 00 00 	tdnei   r9,0
	 c5c:	7c 63 23 92 	divdu   r3,r3,r4
	 c60:	4e 80 00 20 	blr

	 c70:	38 60 00 00 	li      r3,0
	 c74:	4e 80 00 20 	blr

In the first exemple, we see GCC doesn't need to duplicate what
happens after the trap.

In the second exemple, we see that GCC doesn't need to emit a test
and a branch in the likely path in addition to the trap.

We've got some WARN_ON() in .softirqentry.text section so it needs
to be added in the OTHER_TEXT_SECTIONS in modpost.c

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/389962b1b702e3c78d169e59bcfac56282889173.1618331882.git.christophe.leroy@csgroup.eu
2021-08-15 13:49:24 +10:00
..
book3s powerpc/bug: Provide better flexibility to WARN_ON/__WARN_FLAGS() with asm goto 2021-08-15 13:49:24 +10:00
nohash mm: rename p4d_page_vaddr to p4d_pgtable and make it return pud_t * 2021-07-08 11:48:22 -07:00
vdso powerpc/vdso: Add support for time namespaces 2021-04-14 23:04:44 +10:00
8xx_immap.h
accounting.h
agp.h
archrandom.h
asm-compat.h
asm-const.h powerpc/uaccess: Don't use "m<>" constraint with GCC 4.9 2020-10-22 14:26:09 +11:00
asm-offsets.h
asm-prototypes.h powerpc/64: use interrupt restart table to speed up return from interrupt 2021-06-25 00:06:56 +10:00
async_tx.h
atomic.h locking/atomic: powerpc: move to ARCH_ATOMIC 2021-05-26 13:20:52 +02:00
backlight.h
barrier.h powerpc/barrier: Avoid collision with clang's __lwsync macro 2021-06-10 21:44:57 +10:00
bitops.h powerpc/bitops: Fix possible undefined behaviour with fls() and fls64() 2020-11-19 14:50:13 +11:00
bootx.h
btext.h
bug.h powerpc/bug: Provide better flexibility to WARN_ON/__WARN_FLAGS() with asm goto 2021-08-15 13:49:24 +10:00
bugs.h
cache.h treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
cacheflush.h powerpc/mem: Inline flush_dcache_page() 2021-04-14 23:04:19 +10:00
cell-pmu.h
cell-regs.h
checksum.h powerpc: Force inlining of csum_add() 2021-06-16 00:16:47 +10:00
clocksource.h powerpc/vdso: Prepare for switching VDSO to generic C implementation. 2020-12-04 01:01:10 +11:00
cmpxchg.h locking/atomic: powerpc: move to ARCH_ATOMIC 2021-05-26 13:20:52 +02:00
code-patching-asm.h
code-patching.h powerpc: Don't use 'struct ppc_inst' to reference instruction location 2021-06-17 00:09:00 +10:00
compat.h
context_tracking.h
copro.h
cpm.h
cpm1.h powerpc/8xx: Fix early debug when SMC1 is relocated 2020-12-09 17:00:54 +11:00
cpm2.h powerpc: Spelling/typo fixes 2021-04-08 21:17:42 +10:00
cpu_has_feature.h powerpc: Force inlining of cpu_has_feature() to avoid build failure 2021-03-14 20:32:24 +11:00
cpu_setup_power.h powerpc/64s: Convert some cpu_setup() and cpu_restore() functions to C 2020-11-19 14:49:56 +11:00
cpufeature.h
cpuidle.h
cputable.h arch: powerpc: Stop building and using oprofile 2021-01-29 10:05:51 +05:30
cputhreads.h KVM: PPC: Book3S HV: Fix TLB management on SMT8 POWER9 and POWER10 processors 2021-06-21 09:22:34 +10:00
cputime.h powerpc/64: move account_stolen_time into its own function 2021-02-09 00:10:49 +11:00
crashdump-ppc64.h
current.h
dbdma.h
dbell.h
dcr-generic.h
dcr-mmio.h
dcr-native.h powerpc/4xx: Fix build errors from mfdcr() 2021-03-01 12:33:31 +11:00
dcr-regs.h
dcr.h
debug.h powerpc: convert interrupt handlers to use wrappers 2021-02-09 00:02:12 +11:00
delay.h
device.h
disassemble.h
dma-direct.h
dma.h
drmem.h pseries/drmem: update LMBs after LPM 2021-08-10 23:14:55 +10:00
dt_cpu_ftrs.h
dtl.h
edac.h
eeh.h
eeh_event.h
ehv_pic.h
elf.h powerpc: Remove ucache_bsize 2020-12-05 21:49:52 +11:00
elfnote.h
emergency-restart.h
emulated_ops.h
epapr_hcalls.h
exception-64e.h
exception-64s.h KVM: PPC: Book3S 64: Move hcall early register setup to KVM 2021-06-10 22:12:12 +10:00
exec.h
extable.h powerpc/bug: Provide better flexibility to WARN_ON/__WARN_FLAGS() with asm goto 2021-08-15 13:49:24 +10:00
fadump-internal.h
fadump.h
fb.h
feature-fixups.h powerpc/64s: fix scv entry fallback flush vs interrupt 2021-01-20 15:58:19 +11:00
firmware.h powerpc/pseries: Add support for FORM2 associativity 2021-08-13 22:04:27 +10:00
fixmap.h powerpc/64: Fix the definition of the fixmap area 2021-04-22 20:59:15 +10:00
floppy.h
fs_pd.h
fsl_85xx_cache_sram.h
fsl_gtm.h
fsl_hcalls.h
fsl_lbc.h
fsl_pamu_stash.h iommu/fsl_pamu: replace DOMAIN_ATTR_FSL_PAMU_STASH with a direct call 2021-04-07 10:56:52 +02:00
fsl_pm.h
ftrace.h tracing: Fix various typos in comments 2021-03-23 14:08:18 -04:00
futex.h powerpc/futex: Switch to user_access block 2021-03-26 23:19:43 +11:00
grackle.h
hardirq.h
head-64.h powerpc/64: move interrupt return asm to interrupt_64.S 2021-06-25 00:06:55 +10:00
heathrow.h
highmem.h powerpc/mm/highmem: use __set_pte_at() for kmap_local() 2021-01-24 10:34:53 -08:00
hmi.h
hugetlb.h powerpc/mm: Enable compound page check for both THP and HugeTLB 2021-02-11 23:35:06 +11:00
hvcall.h Merge branch 'topic/ppc-kvm' into next 2021-06-23 00:19:08 +10:00
hvconsole.h powerpc/pseries: Move hvc_vio_init_early() prototype to shared location 2021-03-24 14:09:30 +11:00
hvcserver.h
hvsi.h
hw_breakpoint.h
hw_irq.h powerpc/64: use interrupt restart table to speed up return from interrupt 2021-06-25 00:06:56 +10:00
hydra.h powerpc/chrp: Make hydra_init() static 2021-03-24 14:09:29 +11:00
i8259.h
ibmebus.h
icswx.h
ide.h
idle.h
imc-pmu.h
immap_cpm2.h
inst.h powerpc/inst: Refactor PPC32 and PPC64 versions 2021-06-17 00:09:06 +10:00
interrupt.h powerpc/64: enable MSR[EE] in irq replay pt_regs 2021-06-30 22:21:20 +10:00
io-defs.h
io-workarounds.h
io.h mm: remove xlate_dev_kmem_ptr() 2021-05-07 00:26:34 -07:00
io_event_irq.h
iommu.h
ipic.h
irq.h powerpc: Drop dependency between asm/irq.h and linux/irqdomain.h 2021-06-10 13:09:17 +01:00
irq_work.h
irqflags.h
isa-bridge.h
jump_label.h powerpc: Fix initrd corruption with relative jump labels 2021-06-15 23:35:57 +10:00
kasan.h powerpc/kasan: Fix shadow start address with modules 2021-04-25 21:29:04 +10:00
Kbuild powerpc/syscalls: switch to generic syscalltbl.sh 2021-04-14 23:04:16 +10:00
kdebug.h
kdump.h
kexec.h powerpc/kexec_file: Restore FDT size estimation for kdump kernel 2021-03-11 09:53:38 -07:00
kexec_ranges.h
keylargo.h
kfence.h powerpc: Enable KFENCE for PPC32 2021-03-24 14:09:30 +11:00
kgdb.h
kprobes.h
kup.h powerpc/kuap: Force inlining of all first level KUAP helpers. 2021-06-17 00:09:09 +10:00
kvm_asm.h KVM: PPC: Book3S HV P9: implement hash host / hash guest support 2021-06-10 22:12:15 +10:00
kvm_book3s.h KVM: PPC: Book3S HV: Nested support in H_RPT_INVALIDATE 2021-06-22 23:35:37 +10:00
kvm_book3s_32.h
kvm_book3s_64.h KVM: PPC: Book3S HV P9: inline kvmhv_load_hv_regs_and_go into __kvmhv_vcpu_entry_p9 2021-06-10 22:12:13 +10:00
kvm_book3s_asm.h KVM: PPC: Book3S HV: Remove support for running HPT guest on RPT host without mixed mode support 2021-02-10 14:31:08 +11:00
kvm_book3s_uvmem.h
kvm_booke.h
kvm_booke_hv_asm.h
kvm_fpu.h
kvm_guest.h powerpc: Fix is_kvm_guest() / kvm_para_available() 2021-06-25 14:47:19 +10:00
kvm_host.h KVM: stats: Separate generic stats from architecture specific ones 2021-06-24 11:47:56 -04:00
kvm_para.h powerpc: Reintroduce is_kvm_guest() as a fast-path check 2020-12-04 01:01:22 +11:00
kvm_ppc.h KVM: PPC: Book3S HV: XIVE: Change interface of passthrough interrupt routines 2021-08-10 23:14:59 +10:00
libata-portmap.h
linkage.h
livepatch.h powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
local.h
lppaca.h
lv1call.h
machdep.h powerpc/pci: Add ppc_md.discover_phbs() 2021-02-03 09:46:36 +11:00
macio.h
mc146818rtc.h
mce.h powerpc/mce: Remove per cpu variables from MCE handlers 2021-01-31 22:35:49 +11:00
mediabay.h
mem_encrypt.h
membarrier.h powerpc/non-smp: Unconditionaly call smp_mb() on switch_mm 2021-08-10 23:14:55 +10:00
mman.h
mmiowb.h
mmu.h powerpc: Always inline radix_enabled() to fix build failure 2021-08-10 23:14:56 +10:00
mmu_context.h Merge branch 'topic/ppc-kvm' into next 2021-06-23 00:19:08 +10:00
mmzone.h mm: replace CONFIG_NEED_MULTIPLE_NODES with CONFIG_NUMA 2021-06-29 10:53:55 -07:00
module.h
module.lds.h
mpc5xxx.h
mpc6xx.h
mpc52xx.h
mpc52xx_psc.h
mpc85xx.h
mpc5121.h
mpc8260.h
mpic.h
mpic_msgr.h
mpic_timer.h
msi_bitmap.h
nmi.h powerpc: convert interrupt handlers to use wrappers 2021-02-09 00:02:12 +11:00
nvram.h
ohare.h
opal-api.h powerpc/xive: Remove P9 DD1 flag XIVE_IRQ_FLAG_EOI_FW 2020-12-11 09:53:10 +11:00
opal.h powerpc/powernv: remove the nvlink support 2021-05-02 23:35:32 +10:00
paca.h powerpc/64: use interrupt restart table to speed up return from interrupt 2021-06-25 00:06:56 +10:00
page.h
page_32.h powerpc/32s: Cleanup around PTE_FLAGS_OFFSET in hash_low.S 2020-12-09 23:48:14 +11:00
page_64.h
paravirt.h powerpc/pseries: Fix hcall tracing recursion in pv queued spinlocks 2021-05-12 11:07:38 +10:00
parport.h
pasemi_dma.h
pci-bridge.h powerpc/pseries/pci: Add MSI domains 2021-08-10 23:14:57 +10:00
pci.h powerpc/powernv: remove the nvlink support 2021-05-02 23:35:32 +10:00
percpu.h
perf_event.h powerpc/perf: Expose Performance Monitor Counter SPR's as part of extended regs 2021-02-09 01:09:44 +11:00
perf_event_fsl_emb.h
perf_event_server.h powerpc/perf: Expose processor pipeline stage cycles using PERF_SAMPLE_WEIGHT_STRUCT 2021-04-20 14:22:23 +10:00
pgalloc.h mm/thp: define default pmd_pgtable() 2021-07-01 11:06:03 -07:00
pgtable-be-types.h
pgtable-types.h
pgtable.h powerpc updates for 5.14 2021-07-02 12:54:34 -07:00
pkeys.h powerpc/pkeys: Remove unused code 2021-02-09 01:09:44 +11:00
plpar_wrappers.h powerpc/pseries: use notrace hcall variant for H_CEDE idle 2021-05-12 11:07:38 +10:00
pmac_feature.h
pmac_low_i2c.h
pmac_pfunc.h
pmc.h
pmi.h
pnv-ocxl.h ocxl: Initiate a TLB invalidate command 2020-12-04 01:01:30 +11:00
pnv-pci.h powerpc/powernv/pci: Rework pnv_opal_pci_msi_eoi() 2021-08-10 23:15:01 +10:00
powernv.h
ppc-opcode.h powerpc/optprobes: use PPC_RAW_ macros 2021-06-17 00:09:07 +10:00
ppc-pci.h powerpc/pci: Remove unimplemented prototypes 2021-02-11 23:35:36 +11:00
ppc4xx.h
ppc_asm.h powerpc/bug: Provide better flexibility to WARN_ON/__WARN_FLAGS() with asm goto 2021-08-15 13:49:24 +10:00
probes.h powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
processor.h powerpc/64: drop redundant defination of spin_until_cond 2021-06-17 00:09:11 +10:00
prom.h powerpc/pseries: Add support for FORM2 associativity 2021-08-13 22:04:27 +10:00
ps3.h powerpc/ps3: Add dma_mask to ps3_dma_region 2021-06-10 21:44:58 +10:00
ps3av.h
ps3gpu.h
ps3stor.h
pte-walk.h powerpc: Fix reverse map real-mode address lookup with huge vmalloc 2021-05-28 22:54:27 +10:00
ptrace.h powerpc/ptrace: Refactor regs_set_return_{msr/ip} 2021-06-26 00:12:39 +10:00
qspinlock.h locking/atomic: powerpc: move to ARCH_ATOMIC 2021-05-26 13:20:52 +02:00
qspinlock_paravirt.h
reg.h powerpc: Move update_power8_hid0() into its only user 2021-06-17 00:09:11 +10:00
reg_8xx.h
reg_a2.h
reg_booke.h powerpc/32: Handle bookE debugging in C in syscall entry/exit 2021-02-11 23:35:12 +11:00
reg_fsl_emb.h
rheap.h
rio.h
rtas-types.h powerpc/rtas: remove unused rtas_suspend_me_data 2020-12-08 21:41:02 +11:00
rtas.h powerpc/rtas: rename RTAS_RMOBUF_MAX to RTAS_USER_REGION_SIZE 2021-04-14 23:04:16 +10:00
runlatch.h
seccomp.h powerpc: Enable seccomp architecture tracking 2020-11-20 11:16:35 -08:00
sections.h powerpc: Remove in_kernel_text() 2021-08-10 23:14:55 +10:00
secure_boot.h
security_features.h powerpc/security: Add a security feature for STF barrier 2021-06-21 21:13:19 +10:00
secvar.h
serial.h
set_memory.h powerpc/mm: implement set_memory_attr() 2021-06-21 21:13:21 +10:00
setjmp.h
setup.h powerpc: Remove klimit 2021-06-25 00:07:10 +10:00
sfp-machine.h
shmparam.h
signal.h
simple_spinlock.h powerpc/spinlock: Unserialize spin_is_locked 2021-03-26 23:19:43 +11:00
simple_spinlock_types.h
slice.h
smp.h powerpc/smp: Use existing L2 cache_map cpumask to find L3 cache siblings 2021-08-04 10:53:39 +10:00
smu.h
sparsemem.h mm: fix phys_to_target_node() and memory_add_physaddr_to_nid() exports 2020-11-22 10:48:22 -08:00
spinlock.h powerpc/spinlock: Define smp_mb__after_spinlock only once 2021-03-26 23:19:43 +11:00
spinlock_types.h
spu.h arch: powerpc: Stop building and using oprofile 2021-01-29 10:05:51 +05:30
spu_csa.h
spu_info.h
spu_priv1.h
sstep.h powerpc/kprobes: Roll IS_RFI() macro into IS_RFID() 2021-06-25 14:47:18 +10:00
stackprotector.h
stacktrace.h
string.h
svm.h
swab.h
swiotlb.h
switch_to.h powerpc: Fix missing declaration of [en/dis]able_kernel_vsx() 2021-03-10 11:15:00 +11:00
synch.h
syscall.h powerpc/64s/syscall: Fix ptrace syscall info with scv syscalls 2021-05-21 00:58:56 +10:00
syscalls.h
task_size_32.h
task_size_64.h
tce.h
termios.h
thread_info.h powerpc/64s: power4 nap fixup in C 2021-04-08 21:17:45 +10:00
time.h KVM: PPC: Book3S HV P9: Reduce irq_work vs guest decrementer races 2021-06-10 22:12:13 +10:00
timex.h powerpc/time: Move timebase functions into new asm/vdso/timebase.h 2020-12-04 01:01:10 +11:00
tlb.h mm/mremap: allow arch runtime override 2021-07-08 11:48:23 -07:00
tlbflush.h
tm.h
topology.h powerpc/pseries: Add a helper for form1 cpu distance 2021-08-13 22:04:27 +10:00
trace.h
trace_clock.h
tsi108.h
tsi108_irq.h
tsi108_pci.h
types.h
uaccess.h powerpc/uaccess: Fix __get_user() with CONFIG_CC_HAS_ASM_GOTO_OUTPUT 2021-05-12 11:07:39 +10:00
udbg.h
uic.h
ultravisor-api.h
ultravisor.h
uninorth.h
unistd.h powerpc/syscalls: Use sys_old_select() in ppc_select() 2021-03-26 23:19:42 +11:00
uprobes.h powerpc: Don't use 'struct ppc_inst' to reference instruction location 2021-06-17 00:09:00 +10:00
user.h
vas.h powerpc/pseries/vas: Integrate API with open/close windows 2021-06-20 21:58:57 +10:00
vdso.h powerpc/vdso: Cleanup vdso.h 2020-12-04 01:01:19 +11:00
vdso_datapage.h powerpc/vdso: Add support for time namespaces 2021-04-14 23:04:44 +10:00
vermagic.h
vga.h
vio.h powerpc/pseries: Add shutdown() to vio_driver and vio_bus 2021-04-20 14:22:24 +10:00
vmalloc.h mm/vmalloc: provide fallback arch huge vmap support functions 2021-04-30 11:20:40 -07:00
word-at-a-time.h
xics.h powerpc/xics: Rename the map handler in a check handler 2021-08-10 23:14:59 +10:00
xive-regs.h KVM: PPC: Book3S HV: XIVE: Add support for automatic save-restore 2021-08-10 23:15:02 +10:00
xive.h KVM: PPC: Book3S HV: XIVE: Add support for automatic save-restore 2021-08-10 23:15:02 +10:00
xmon.h powerpc: remove unneeded semicolons 2021-02-09 00:10:50 +11:00
xor.h
xor_altivec.h