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
atomic.h	ARC: [plat-eznps] add missing atomic_fetch_xxx operations	2016-09-30 14:48:18 -07:00
barrier.h
bitops.h
bug.h
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
cmpxchg.h
current.h
delay.h	ARC: udelay: fix inline assembler by adding LP_COUNT to clobber list	2017-01-24 10:54:24 -08:00
disasm.h
dma-mapping.h
dma.h
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
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
fb.h
futex.h
highmem.h
hugepage.h
io.h
irq.h
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
Kbuild	PCI/MSI: Enable PCI_MSI_IRQ_DOMAIN support for ARC	2016-09-06 10:53:32 -05:00
kdebug.h
kgdb.h
kmap_types.h
kprobes.h
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
mmu_context.h
mmu.h
mmzone.h
module.h	ARC: module: Fix !CONFIG_ARC_DW2_UNWIND builds	2017-01-18 11:17:44 -08:00
page.h
pci.h
perf_event.h	arc: perf: Enable generic "cache-references" and "cache-misses" events	2016-09-30 14:48:18 -07:00
pgalloc.h
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
segment.h
serial.h
setup.h	ARCv2: IOC: Use actual memory size to setup aperture size	2017-01-18 14:52:43 -08:00
shmparam.h
smp.h	ARC: IRQ: Do not use hwirq as virq and vice versa	2016-11-08 12:05:10 -08:00
spinlock_types.h
spinlock.h
stacktrace.h
string.h
switch_to.h
syscall.h
syscalls.h	ARC: syscall for userspace cmpxchg assist	2016-10-24 09:24:26 -07:00
thread_info.h
timex.h
tlb-mmu1.h
tlb.h
tlbflush.h
uaccess.h	ARC: uaccess: get_user to zero out dest in cause of fault	2016-09-13 17:49:41 -04:00
unaligned.h
unwind.h