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[RFC v2 PATCH 4/7] arm64: tlbflush.h: add __tlbi() macro

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  [RFC v2 PATCH 4/7] arm64: tlbflush.h: add __tlbi() macro Punit Agrawal <punit.agrawal@arm.com> - 2016-09-05 18:40 +0200
    Re: [RFC v2 PATCH 4/7] arm64: tlbflush.h: add __tlbi() macro Christoffer Dall <christoffer.dall@linaro.org> - 2016-09-06 08:40 +0200
      Re: [RFC v2 PATCH 4/7] arm64: tlbflush.h: add __tlbi() macro Punit Agrawal <punit.agrawal@arm.com> - 2016-09-06 12:10 +0200
        Re: [RFC v2 PATCH 4/7] arm64: tlbflush.h: add __tlbi() macro Christoffer Dall <christoffer.dall@linaro.org> - 2016-09-06 12:40 +0200
    Re: [RFC v2 PATCH 4/7] arm64: tlbflush.h: add __tlbi() macro Will Deacon <will.deacon@arm.com> - 2016-09-06 20:20 +0200

#1476588 — [RFC v2 PATCH 4/7] arm64: tlbflush.h: add __tlbi() macro

From: Mark Rutland <mark.rutland@arm.com>

As with dsb() and isb(), add a __tlbi() helper so that we can avoid
distracting asm boilerplate every time we want a TLBI. As some TLBI
operations take an argument while others do not, some pre-processor is
used to handle these two cases with different assembly blocks.

The existing tlbflush.h code is moved over to use the helper.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
[ rename helper to __tlbi, update commit log ]
Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
---
 arch/arm64/include/asm/tlbflush.h | 31 +++++++++++++++++++++++--------
 1 file changed, 23 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
index b460ae2..e9e42a7 100644
--- a/arch/arm64/include/asm/tlbflush.h
+++ b/arch/arm64/include/asm/tlbflush.h
@@ -25,6 +25,21 @@
 #include <asm/cputype.h>
 
 /*
+ * Raw TLBI operations. Drivers and most kernel code should use the TLB
+ * management routines below in preference to these. Where necessary, these can
+ * be used to avoid asm() boilerplate.
+ *
+ * Can be used as __tlbi(op) or __tlbi(op, arg), depending on whether a
+ * particular TLBI op takes an argument or not. The macros below handle invoking
+ * the asm with or without the register argument as appropriate.
+ */
+#define __TLBI_0(op, arg)		asm ("tlbi " #op)
+#define __TLBI_1(op, arg)		asm ("tlbi " #op ", %0" : : "r" (arg))
+#define __TLBI_N(op, arg, n, ...)	__TLBI_##n(op, arg)
+
+#define __tlbi(op, ...)		__TLBI_N(op, ##__VA_ARGS__, 1, 0)
+
+/*
  *	TLB Management
  *	==============
  *
@@ -66,7 +81,7 @@
 static inline void local_flush_tlb_all(void)
 {
 	dsb(nshst);
-	asm("tlbi	vmalle1");
+	__tlbi(vmalle1);
 	dsb(nsh);
 	isb();
 }
@@ -74,7 +89,7 @@ static inline void local_flush_tlb_all(void)
 static inline void flush_tlb_all(void)
 {
 	dsb(ishst);
-	asm("tlbi	vmalle1is");
+	__tlbi(vmalle1is);
 	dsb(ish);
 	isb();
 }
@@ -84,7 +99,7 @@ static inline void flush_tlb_mm(struct mm_struct *mm)
 	unsigned long asid = ASID(mm) << 48;
 
 	dsb(ishst);
-	asm("tlbi	aside1is, %0" : : "r" (asid));
+	__tlbi(aside1is, asid);
 	dsb(ish);
 }
 
@@ -94,7 +109,7 @@ static inline void flush_tlb_page(struct vm_area_struct *vma,
 	unsigned long addr = uaddr >> 12 | (ASID(vma->vm_mm) << 48);
 
 	dsb(ishst);
-	asm("tlbi	vale1is, %0" : : "r" (addr));
+	__tlbi(vale1is, addr);
 	dsb(ish);
 }
 
@@ -122,9 +137,9 @@ static inline void __flush_tlb_range(struct vm_area_struct *vma,
 	dsb(ishst);
 	for (addr = start; addr < end; addr += 1 << (PAGE_SHIFT - 12)) {
 		if (last_level)
-			asm("tlbi vale1is, %0" : : "r"(addr));
+			__tlbi(vale1is, addr);
 		else
-			asm("tlbi vae1is, %0" : : "r"(addr));
+			__tlbi(vae1is, addr);
 	}
 	dsb(ish);
 }
@@ -149,7 +164,7 @@ static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end
 
 	dsb(ishst);
 	for (addr = start; addr < end; addr += 1 << (PAGE_SHIFT - 12))
-		asm("tlbi vaae1is, %0" : : "r"(addr));
+		__tlbi(vaae1is, addr);
 	dsb(ish);
 	isb();
 }
@@ -163,7 +178,7 @@ static inline void __flush_tlb_pgtable(struct mm_struct *mm,
 {
 	unsigned long addr = uaddr >> 12 | (ASID(mm) << 48);
 
-	asm("tlbi	vae1is, %0" : : "r" (addr));
+	__tlbi(vae1is, addr);
 	dsb(ish);
 }
 
-- 
2.8.1

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#1477103

On Mon, Sep 05, 2016 at 05:31:34PM +0100, Punit Agrawal wrote:
> From: Mark Rutland <mark.rutland@arm.com>
> 
> As with dsb() and isb(), add a __tlbi() helper so that we can avoid
> distracting asm boilerplate every time we want a TLBI. As some TLBI
> operations take an argument while others do not, some pre-processor is
> used to handle these two cases with different assembly blocks.
> 
> The existing tlbflush.h code is moved over to use the helper.
> 
> Signed-off-by: Mark Rutland <mark.rutland@arm.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Marc Zyngier <marc.zyngier@arm.com>
> Cc: Will Deacon <will.deacon@arm.com>
> [ rename helper to __tlbi, update commit log ]
> Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
> ---
>  arch/arm64/include/asm/tlbflush.h | 31 +++++++++++++++++++++++--------
>  1 file changed, 23 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
> index b460ae2..e9e42a7 100644
> --- a/arch/arm64/include/asm/tlbflush.h
> +++ b/arch/arm64/include/asm/tlbflush.h
> @@ -25,6 +25,21 @@
>  #include <asm/cputype.h>
>  
>  /*
> + * Raw TLBI operations. Drivers and most kernel code should use the TLB
> + * management routines below in preference to these. Where necessary, these can

in preference to these?

> + * be used to avoid asm() boilerplate.

'these' seem to be a bit overloaded in this commentary.

> + *
> + * Can be used as __tlbi(op) or __tlbi(op, arg), depending on whether a
> + * particular TLBI op takes an argument or not. The macros below handle invoking
> + * the asm with or without the register argument as appropriate.
> + */
> +#define __TLBI_0(op, arg)		asm ("tlbi " #op)
> +#define __TLBI_1(op, arg)		asm ("tlbi " #op ", %0" : : "r" (arg))
> +#define __TLBI_N(op, arg, n, ...)	__TLBI_##n(op, arg)
> +
> +#define __tlbi(op, ...)		__TLBI_N(op, ##__VA_ARGS__, 1, 0)
> +
> +/*
>   *	TLB Management
>   *	==============
>   *
> @@ -66,7 +81,7 @@
>  static inline void local_flush_tlb_all(void)
>  {
>  	dsb(nshst);
> -	asm("tlbi	vmalle1");
> +	__tlbi(vmalle1);
>  	dsb(nsh);
>  	isb();
>  }
> @@ -74,7 +89,7 @@ static inline void local_flush_tlb_all(void)
>  static inline void flush_tlb_all(void)
>  {
>  	dsb(ishst);
> -	asm("tlbi	vmalle1is");
> +	__tlbi(vmalle1is);
>  	dsb(ish);
>  	isb();
>  }
> @@ -84,7 +99,7 @@ static inline void flush_tlb_mm(struct mm_struct *mm)
>  	unsigned long asid = ASID(mm) << 48;
>  
>  	dsb(ishst);
> -	asm("tlbi	aside1is, %0" : : "r" (asid));
> +	__tlbi(aside1is, asid);
>  	dsb(ish);
>  }
>  
> @@ -94,7 +109,7 @@ static inline void flush_tlb_page(struct vm_area_struct *vma,
>  	unsigned long addr = uaddr >> 12 | (ASID(vma->vm_mm) << 48);
>  
>  	dsb(ishst);
> -	asm("tlbi	vale1is, %0" : : "r" (addr));
> +	__tlbi(vale1is, addr);
>  	dsb(ish);
>  }
>  
> @@ -122,9 +137,9 @@ static inline void __flush_tlb_range(struct vm_area_struct *vma,
>  	dsb(ishst);
>  	for (addr = start; addr < end; addr += 1 << (PAGE_SHIFT - 12)) {
>  		if (last_level)
> -			asm("tlbi vale1is, %0" : : "r"(addr));
> +			__tlbi(vale1is, addr);
>  		else
> -			asm("tlbi vae1is, %0" : : "r"(addr));
> +			__tlbi(vae1is, addr);
>  	}
>  	dsb(ish);
>  }
> @@ -149,7 +164,7 @@ static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end
>  
>  	dsb(ishst);
>  	for (addr = start; addr < end; addr += 1 << (PAGE_SHIFT - 12))
> -		asm("tlbi vaae1is, %0" : : "r"(addr));
> +		__tlbi(vaae1is, addr);
>  	dsb(ish);
>  	isb();
>  }
> @@ -163,7 +178,7 @@ static inline void __flush_tlb_pgtable(struct mm_struct *mm,
>  {
>  	unsigned long addr = uaddr >> 12 | (ASID(mm) << 48);
>  
> -	asm("tlbi	vae1is, %0" : : "r" (addr));
> +	__tlbi(vae1is, addr);
>  	dsb(ish);
>  }
>  
> -- 
> 2.8.1
> 

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#1477237

Christoffer Dall <christoffer.dall@linaro.org> writes:

> On Mon, Sep 05, 2016 at 05:31:34PM +0100, Punit Agrawal wrote:
>> From: Mark Rutland <mark.rutland@arm.com>
>> 
>> As with dsb() and isb(), add a __tlbi() helper so that we can avoid
>> distracting asm boilerplate every time we want a TLBI. As some TLBI
>> operations take an argument while others do not, some pre-processor is
>> used to handle these two cases with different assembly blocks.
>> 
>> The existing tlbflush.h code is moved over to use the helper.
>> 
>> Signed-off-by: Mark Rutland <mark.rutland@arm.com>
>> Cc: Catalin Marinas <catalin.marinas@arm.com>
>> Cc: Marc Zyngier <marc.zyngier@arm.com>
>> Cc: Will Deacon <will.deacon@arm.com>
>> [ rename helper to __tlbi, update commit log ]
>> Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
>> ---
>>  arch/arm64/include/asm/tlbflush.h | 31 +++++++++++++++++++++++--------
>>  1 file changed, 23 insertions(+), 8 deletions(-)
>> 
>> diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
>> index b460ae2..e9e42a7 100644
>> --- a/arch/arm64/include/asm/tlbflush.h
>> +++ b/arch/arm64/include/asm/tlbflush.h
>> @@ -25,6 +25,21 @@
>>  #include <asm/cputype.h>
>>  
>>  /*
>> + * Raw TLBI operations. Drivers and most kernel code should use the TLB
>> + * management routines below in preference to these. Where necessary, these can
>
> in preference to these?
>
>> + * be used to avoid asm() boilerplate.
>
> 'these' seem to be a bit overloaded in this commentary.
>

I've locally updated the comment to - 

"Raw TLBI operations.

Where necessary, use the __tlbi macro to avoid asm()
boilerplate. *Note:* Drivers and most kernel code should use the
TLB management routines in preference to the macros."

Is that better?

>> + *
>> + * Can be used as __tlbi(op) or __tlbi(op, arg), depending on whether a
>> + * particular TLBI op takes an argument or not. The macros below handle invoking
>> + * the asm with or without the register argument as appropriate.
>> + */
>> +#define __TLBI_0(op, arg)		asm ("tlbi " #op)
>> +#define __TLBI_1(op, arg)		asm ("tlbi " #op ", %0" : : "r" (arg))
>> +#define __TLBI_N(op, arg, n, ...)	__TLBI_##n(op, arg)
>> +
>> +#define __tlbi(op, ...)		__TLBI_N(op, ##__VA_ARGS__, 1, 0)
>> +
>> +/*
>>   *	TLB Management
>>   *	==============
>>   *
>> @@ -66,7 +81,7 @@
>>  static inline void local_flush_tlb_all(void)
>>  {
>>  	dsb(nshst);
>> -	asm("tlbi	vmalle1");
>> +	__tlbi(vmalle1);
>>  	dsb(nsh);
>>  	isb();
>>  }
>> @@ -74,7 +89,7 @@ static inline void local_flush_tlb_all(void)
>>  static inline void flush_tlb_all(void)
>>  {
>>  	dsb(ishst);
>> -	asm("tlbi	vmalle1is");
>> +	__tlbi(vmalle1is);
>>  	dsb(ish);
>>  	isb();
>>  }
>> @@ -84,7 +99,7 @@ static inline void flush_tlb_mm(struct mm_struct *mm)
>>  	unsigned long asid = ASID(mm) << 48;
>>  
>>  	dsb(ishst);
>> -	asm("tlbi	aside1is, %0" : : "r" (asid));
>> +	__tlbi(aside1is, asid);
>>  	dsb(ish);
>>  }
>>  
>> @@ -94,7 +109,7 @@ static inline void flush_tlb_page(struct vm_area_struct *vma,
>>  	unsigned long addr = uaddr >> 12 | (ASID(vma->vm_mm) << 48);
>>  
>>  	dsb(ishst);
>> -	asm("tlbi	vale1is, %0" : : "r" (addr));
>> +	__tlbi(vale1is, addr);
>>  	dsb(ish);
>>  }
>>  
>> @@ -122,9 +137,9 @@ static inline void __flush_tlb_range(struct vm_area_struct *vma,
>>  	dsb(ishst);
>>  	for (addr = start; addr < end; addr += 1 << (PAGE_SHIFT - 12)) {
>>  		if (last_level)
>> -			asm("tlbi vale1is, %0" : : "r"(addr));
>> +			__tlbi(vale1is, addr);
>>  		else
>> -			asm("tlbi vae1is, %0" : : "r"(addr));
>> +			__tlbi(vae1is, addr);
>>  	}
>>  	dsb(ish);
>>  }
>> @@ -149,7 +164,7 @@ static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end
>>  
>>  	dsb(ishst);
>>  	for (addr = start; addr < end; addr += 1 << (PAGE_SHIFT - 12))
>> -		asm("tlbi vaae1is, %0" : : "r"(addr));
>> +		__tlbi(vaae1is, addr);
>>  	dsb(ish);
>>  	isb();
>>  }
>> @@ -163,7 +178,7 @@ static inline void __flush_tlb_pgtable(struct mm_struct *mm,
>>  {
>>  	unsigned long addr = uaddr >> 12 | (ASID(mm) << 48);
>>  
>> -	asm("tlbi	vae1is, %0" : : "r" (addr));
>> +	__tlbi(vae1is, addr);
>>  	dsb(ish);
>>  }
>>  
>> -- 
>> 2.8.1
>> 
> _______________________________________________
> kvmarm mailing list
> kvmarm@lists.cs.columbia.edu
> https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

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#1477264

On Tue, Sep 06, 2016 at 11:05:17AM +0100, Punit Agrawal wrote:
> Christoffer Dall <christoffer.dall@linaro.org> writes:
> 
> > On Mon, Sep 05, 2016 at 05:31:34PM +0100, Punit Agrawal wrote:
> >> From: Mark Rutland <mark.rutland@arm.com>
> >> 
> >> As with dsb() and isb(), add a __tlbi() helper so that we can avoid
> >> distracting asm boilerplate every time we want a TLBI. As some TLBI
> >> operations take an argument while others do not, some pre-processor is
> >> used to handle these two cases with different assembly blocks.
> >> 
> >> The existing tlbflush.h code is moved over to use the helper.
> >> 
> >> Signed-off-by: Mark Rutland <mark.rutland@arm.com>
> >> Cc: Catalin Marinas <catalin.marinas@arm.com>
> >> Cc: Marc Zyngier <marc.zyngier@arm.com>
> >> Cc: Will Deacon <will.deacon@arm.com>
> >> [ rename helper to __tlbi, update commit log ]
> >> Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
> >> ---
> >>  arch/arm64/include/asm/tlbflush.h | 31 +++++++++++++++++++++++--------
> >>  1 file changed, 23 insertions(+), 8 deletions(-)
> >> 
> >> diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
> >> index b460ae2..e9e42a7 100644
> >> --- a/arch/arm64/include/asm/tlbflush.h
> >> +++ b/arch/arm64/include/asm/tlbflush.h
> >> @@ -25,6 +25,21 @@
> >>  #include <asm/cputype.h>
> >>  
> >>  /*
> >> + * Raw TLBI operations. Drivers and most kernel code should use the TLB
> >> + * management routines below in preference to these. Where necessary, these can
> >
> > in preference to these?
> >
> >> + * be used to avoid asm() boilerplate.
> >
> > 'these' seem to be a bit overloaded in this commentary.
> >
> 
> I've locally updated the comment to - 
> 
> "Raw TLBI operations.
> 
> Where necessary, use the __tlbi macro to avoid asm()
> boilerplate. *Note:* Drivers and most kernel code should use the
> TLB management routines in preference to the macros."
> 
> Is that better?

Yes.  I would get rid of the *Note:* part, but that's really
nit-picking.

Thanks,
-Christoffer

> 
> >> + *
> >> + * Can be used as __tlbi(op) or __tlbi(op, arg), depending on whether a
> >> + * particular TLBI op takes an argument or not. The macros below handle invoking
> >> + * the asm with or without the register argument as appropriate.
> >> + */
> >> +#define __TLBI_0(op, arg)		asm ("tlbi " #op)
> >> +#define __TLBI_1(op, arg)		asm ("tlbi " #op ", %0" : : "r" (arg))
> >> +#define __TLBI_N(op, arg, n, ...)	__TLBI_##n(op, arg)
> >> +
> >> +#define __tlbi(op, ...)		__TLBI_N(op, ##__VA_ARGS__, 1, 0)
> >> +
> >> +/*
> >>   *	TLB Management
> >>   *	==============
> >>   *
> >> @@ -66,7 +81,7 @@
> >>  static inline void local_flush_tlb_all(void)
> >>  {
> >>  	dsb(nshst);
> >> -	asm("tlbi	vmalle1");
> >> +	__tlbi(vmalle1);
> >>  	dsb(nsh);
> >>  	isb();
> >>  }
> >> @@ -74,7 +89,7 @@ static inline void local_flush_tlb_all(void)
> >>  static inline void flush_tlb_all(void)
> >>  {
> >>  	dsb(ishst);
> >> -	asm("tlbi	vmalle1is");
> >> +	__tlbi(vmalle1is);
> >>  	dsb(ish);
> >>  	isb();
> >>  }
> >> @@ -84,7 +99,7 @@ static inline void flush_tlb_mm(struct mm_struct *mm)
> >>  	unsigned long asid = ASID(mm) << 48;
> >>  
> >>  	dsb(ishst);
> >> -	asm("tlbi	aside1is, %0" : : "r" (asid));
> >> +	__tlbi(aside1is, asid);
> >>  	dsb(ish);
> >>  }
> >>  
> >> @@ -94,7 +109,7 @@ static inline void flush_tlb_page(struct vm_area_struct *vma,
> >>  	unsigned long addr = uaddr >> 12 | (ASID(vma->vm_mm) << 48);
> >>  
> >>  	dsb(ishst);
> >> -	asm("tlbi	vale1is, %0" : : "r" (addr));
> >> +	__tlbi(vale1is, addr);
> >>  	dsb(ish);
> >>  }
> >>  
> >> @@ -122,9 +137,9 @@ static inline void __flush_tlb_range(struct vm_area_struct *vma,
> >>  	dsb(ishst);
> >>  	for (addr = start; addr < end; addr += 1 << (PAGE_SHIFT - 12)) {
> >>  		if (last_level)
> >> -			asm("tlbi vale1is, %0" : : "r"(addr));
> >> +			__tlbi(vale1is, addr);
> >>  		else
> >> -			asm("tlbi vae1is, %0" : : "r"(addr));
> >> +			__tlbi(vae1is, addr);
> >>  	}
> >>  	dsb(ish);
> >>  }
> >> @@ -149,7 +164,7 @@ static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end
> >>  
> >>  	dsb(ishst);
> >>  	for (addr = start; addr < end; addr += 1 << (PAGE_SHIFT - 12))
> >> -		asm("tlbi vaae1is, %0" : : "r"(addr));
> >> +		__tlbi(vaae1is, addr);
> >>  	dsb(ish);
> >>  	isb();
> >>  }
> >> @@ -163,7 +178,7 @@ static inline void __flush_tlb_pgtable(struct mm_struct *mm,
> >>  {
> >>  	unsigned long addr = uaddr >> 12 | (ASID(mm) << 48);
> >>  
> >> -	asm("tlbi	vae1is, %0" : : "r" (addr));
> >> +	__tlbi(vae1is, addr);
> >>  	dsb(ish);
> >>  }
> >>  
> >> -- 
> >> 2.8.1
> >> 
> > _______________________________________________
> > kvmarm mailing list
> > kvmarm@lists.cs.columbia.edu
> > https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

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#1477728

On Mon, Sep 05, 2016 at 05:31:34PM +0100, Punit Agrawal wrote:
> From: Mark Rutland <mark.rutland@arm.com>
> 
> As with dsb() and isb(), add a __tlbi() helper so that we can avoid
> distracting asm boilerplate every time we want a TLBI. As some TLBI
> operations take an argument while others do not, some pre-processor is
> used to handle these two cases with different assembly blocks.
> 
> The existing tlbflush.h code is moved over to use the helper.
> 
> Signed-off-by: Mark Rutland <mark.rutland@arm.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Marc Zyngier <marc.zyngier@arm.com>
> Cc: Will Deacon <will.deacon@arm.com>
> [ rename helper to __tlbi, update commit log ]
> Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
> ---
>  arch/arm64/include/asm/tlbflush.h | 31 +++++++++++++++++++++++--------
>  1 file changed, 23 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
> index b460ae2..e9e42a7 100644
> --- a/arch/arm64/include/asm/tlbflush.h
> +++ b/arch/arm64/include/asm/tlbflush.h
> @@ -25,6 +25,21 @@
>  #include <asm/cputype.h>
>  
>  /*
> + * Raw TLBI operations. Drivers and most kernel code should use the TLB
> + * management routines below in preference to these. Where necessary, these can
> + * be used to avoid asm() boilerplate.
> + *
> + * Can be used as __tlbi(op) or __tlbi(op, arg), depending on whether a
> + * particular TLBI op takes an argument or not. The macros below handle invoking
> + * the asm with or without the register argument as appropriate.
> + */
> +#define __TLBI_0(op, arg)		asm ("tlbi " #op)
> +#define __TLBI_1(op, arg)		asm ("tlbi " #op ", %0" : : "r" (arg))
> +#define __TLBI_N(op, arg, n, ...)	__TLBI_##n(op, arg)
> +
> +#define __tlbi(op, ...)		__TLBI_N(op, ##__VA_ARGS__, 1, 0)

This looks ok to me now. With Christoffer's comments address:

Reviewed-by: Will Deacon <will.deacon@arm.com>

Will

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