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linux/arch/arc/include/asm
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Vineet Gupta 36425cd670 ARC: udelay: fix inline assembler by adding LP_COUNT to clobber list 
commit 3c7c7a2fc8 ("ARC: Don't use "+l" inline asm constraint")
modified the inline assembly to setup LP_COUNT register manually and NOT
rely on gcc to do it (with the +l inline assembler contraint hint, now
being retired in the compiler)

However the fix was flawed as we didn't add LP_COUNT to asm clobber list,
meaning gcc doesn't know that LP_COUNT or zero-delay-loops are in action
in the inline asm.

This resulted in some fun - as nested ZOL loops were being generared

| mov lp_count,250000 ;16 # tmp235,
| lp .L__GCC__LP14 #		<======= OUTER LOOP (gcc generated)
|   .L14:
|   ld r2, [r5] # MEM[(volatile u32 *)prephitmp_43], w
|   dmb 1
|   breq r2, -1, @.L21 #, w,,
|   bbit0 r2,1,@.L13 # w,,
|   ld r4,[r7] ;25 # loops_per_jiffy, loops_per_jiffy
|   mpymu r3,r4,r6 #, loops_per_jiffy, tmp234
|
|   mov lp_count, r3 #		 <====== INNER LOOP (from inline asm)
|   lp 1f
| 	 nop
|   1:
|   nop_s
| .L__GCC__LP14: ; loop end, start is @.L14 #,

This caused issues with drivers relying on sane behaviour of udelay
friends.

With LP_COUNT added to clobber list, gcc doesn't generate the outer
loop in say above case.

Addresses STAR 9001146134

Reported-by: Joao Pinto <jpinto@synopsys.com>
Fixes: 3c7c7a2fc8 ("ARC: Don't use "+l" inline asm constraint")
Cc: stable@vger.kernel.org
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2017-01-24 10:54:24 -08:00
..
arcregs.h ARC: mm: No need to save cache version in @cpuinfo 2016-12-19 11:54:41 -08:00
asm-offsets.h ARC: Generic Headers 2013-01-28 12:34:21 +05:30
atomic.h ARC: [plat-eznps] add missing atomic_fetch_xxx operations 2016-09-30 14:48:18 -07:00
barrier.h ARC: [plat-eznps] Use dedicated SMP barriers 2016-05-09 09:32:33 +05:30
bitops.h ARC: [plat-eznps] Use dedicated atomic/bitops/cmpxchg 2016-05-09 09:32:33 +05:30
bug.h ARC: BUG() dumps stack after @msg (@msg now same as in generic BUG)) 2014-10-13 14:46:18 +05:30
cache.h ARCv2: IOC: Adhere to progamming model guidelines to avoid DMA corruption 2017-01-18 14:48:33 -08:00
cacheflush.h ARC: mm: arc700: Don't assume 2 colours for aliasing VIPT dcache 2016-12-19 11:55:17 -08:00
checksum.h ipv4: Update parameters for csum_tcpudp_magic to their original types 2016-03-13 23:55:13 -04:00
cmpxchg.h ARC: [plat-eznps] Use dedicated atomic/bitops/cmpxchg 2016-05-09 09:32:33 +05:30
current.h ARC: remove extraneous __KERNEL__ guards 2014-10-13 14:46:20 +05:30
delay.h ARC: udelay: fix inline assembler by adding LP_COUNT to clobber list 2017-01-24 10:54:24 -08:00
disasm.h ARC: disassembly (needed by kprobes/kgdb/unaligned-access-emul) 2013-02-15 23:16:04 +05:30
dma-mapping.h ARC: dma: reintroduce platform specific dma<->phys 2016-03-19 14:34:09 +05:30
dma.h ARC: Add PCI support 2016-03-10 14:44:13 -06:00
dwarf.h ARC: dw2 unwind: add infrastructure for adding cfi pseudo ops to asm 2016-09-30 14:48:22 -07:00
elf.h ARC: fix build warning in elf.h 2016-10-19 14:38:53 -07:00
entry-arcv2.h ARCv2: save r30 on kernel entry as gcc uses it for code-gen 2017-01-10 11:51:33 -08:00
entry-compact.h Fix typos 2016-05-30 10:07:32 +05:30
entry.h ARC: use correct offset in pt_regs for saving/restoring user mode r25 2016-08-19 10:44:13 -07:00
exec.h ARC: Fundamental ARCH data-types/defines 2013-02-11 20:00:34 +05:30
fb.h arc: Add our own implementation of fb_pgprotect() 2016-04-07 14:59:09 +05:30
futex.h ARC: change some branchs to jumps to resolve linkage errors 2015-08-20 18:53:15 +05:30
highmem.h ARC: mm: HIGHMEM: kmap API implementation 2015-10-28 19:49:04 +05:30
hugepage.h arch: fix has_transparent_hugepage() 2016-05-19 19:12:14 -07:00
io.h ARC: Add missing io barriers to io{read,write}{16,32}be() 2016-05-05 16:35:28 +05:30
irq.h ARC: irq: export some IRQs again 2016-05-09 09:32:30 +05:30
irqflags-arcv2.h ARCv2: intc: default all interrupts to priority 1 2016-12-14 09:23:46 -08:00
irqflags-compact.h ARC: Call trace_hardirqs_on() before enabling irqs 2016-08-10 10:14:07 -07:00
irqflags.h ARCv2: Support for ARCv2 ISA and HS38x cores 2015-06-22 14:06:55 +05:30
Kbuild PCI/MSI: Enable PCI_MSI_IRQ_DOMAIN support for ARC 2016-09-06 10:53:32 -05:00
kdebug.h ARC: Fundamental ARCH data-types/defines 2013-02-11 20:00:34 +05:30
kgdb.h ARC: Update order of registers in KGDB to match GDB 7.5 2014-10-13 14:46:20 +05:30
kmap_types.h ARC: mm: HIGHMEM: kmap API implementation 2015-10-28 19:49:04 +05:30
kprobes.h ARC: Remove explicit passing around of ECR 2013-06-26 15:30:50 +05:30
linkage.h ARC: dw2 unwind: add infrastructure for adding cfi pseudo ops to asm 2016-09-30 14:48:22 -07:00
mach_desc.h ARC: smp: Rename platform hook @init_cpu_smp -> @init_per_cpu 2015-12-17 12:56:56 +05:30
mmu_context.h Fix typos 2016-05-30 10:07:32 +05:30
mmu.h ARC: mm: PAE40 support 2015-10-29 18:41:30 +05:30
mmzone.h ARC: support HIGHMEM even without PAE40 2016-05-05 16:35:46 +05:30
module.h ARC: module: Fix !CONFIG_ARC_DW2_UNWIND builds 2017-01-18 11:17:44 -08:00
page.h ARC: pae: STRICT_MM_TYPECHECKS was broken 2016-05-13 09:16:09 +05:30
pci.h ARC: Add PCI support 2016-03-10 14:44:13 -06:00
perf_event.h arc: perf: Enable generic "cache-references" and "cache-misses" events 2016-09-30 14:48:18 -07:00
pgalloc.h arc: get rid of superfluous __GFP_REPEAT 2016-06-24 17:23:52 -07:00
pgtable.h ARC: mm: PAE40: Fix crash at munmap 2016-11-29 09:12:08 -08:00
processor.h locking/core: Provide common cpu_relax_yield() definition 2016-11-17 08:17:36 +01:00
ptrace.h ARCv2: save r30 on kernel entry as gcc uses it for code-gen 2017-01-10 11:51:33 -08:00
sections.h of/fdt: consolidate built-in dtb section variables 2014-04-30 00:59:13 -05:00
segment.h ARC: uaccess friends 2013-02-11 20:00:31 +05:30
serial.h ARC: Dynamically determine BASE_BAUD from DeviceTree 2015-02-02 17:08:37 +05:30
setup.h ARCv2: IOC: Use actual memory size to setup aperture size 2017-01-18 14:52:43 -08:00
shmparam.h ARC: [mm] Aliasing VIPT dcache support 4/4 2013-05-09 22:00:57 +05:30
smp.h ARC: IRQ: Do not use hwirq as virq and vice versa 2016-11-08 12:05:10 -08:00
spinlock_types.h ARC: LLOCK/SCOND based rwlock 2015-08-04 09:26:33 +05:30
spinlock.h locking/spinlock, arch: Update and fix spin_unlock_wait() implementations 2016-06-14 11:55:15 +02:00
stacktrace.h ARC: Make arc_unwind_core accessible externally 2015-02-27 10:15:00 +05:30
string.h ARC: remove extraneous __KERNEL__ guards 2014-10-13 14:46:20 +05:30
switch_to.h ARC: Process-creation/scheduling/idle-loop 2013-02-11 20:00:38 +05:30
syscall.h ARC: stop using pt_regs->orig_r8 2013-06-22 19:23:26 +05:30
syscalls.h ARC: syscall for userspace cmpxchg assist 2016-10-24 09:24:26 -07:00
thread_info.h Fix typos 2016-05-30 10:07:32 +05:30
timex.h ARC: Timers/counters/delay management 2013-02-11 20:00:39 +05:30
tlb-mmu1.h ARC: Disintegrate arcregs.h 2013-06-22 13:46:42 +05:30
tlb.h ARC: Disintegrate arcregs.h 2013-06-22 13:46:42 +05:30
tlbflush.h ARC: thp: unbork !CONFIG_TRANSPARENT_HUGEPAGE build 2016-03-17 15:31:45 +05:30
uaccess.h ARC: uaccess: get_user to zero out dest in cause of fault 2016-09-13 17:49:41 -04:00
unaligned.h ARC: rename kconfig option for unaligned emulation 2014-10-13 14:46:15 +05:30
unwind.h ARC: dw2 unwind: Reinstante unwinding out of modules 2015-12-17 11:10:23 +05:30