[PATCH 1/1] arm64: Correcting format specifier for printing 64 bit addresses

[PATCH 1/1] arm64: Correcting format specifier for printing 64 bit addresses

[Maninder Singh]

This patch corrects format specifier for printing 64 bit addresses.

Signed-off-by: Maninder Singh <maninder1.s@samsung.com>
Signed-off-by: Vaneet Narang <v.narang@samsung.com>
---
 arch/arm64/kernel/signal.c |  2 +-
 arch/arm64/kvm/sys_regs.c  |  8 ++++++--
 arch/arm64/mm/fault.c      | 15 ++++++++++-----
 arch/arm64/mm/mmu.c        |  4 ++--
 4 files changed, 19 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
index c7b6de6..c89d5fd 100644
--- a/arch/arm64/kernel/signal.c
+++ b/arch/arm64/kernel/signal.c
@@ -155,7 +155,7 @@ asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
 
 badframe:
 	if (show_unhandled_signals)
-		pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
+		pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%016llx sp=%016llx\n",
 				    current->comm, task_pid_nr(current), __func__,
 				    regs->pc, regs->sp);
 	force_sig(SIGSEGV, current);
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 87e7e66..89bf5c1 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1554,8 +1554,12 @@ static void unhandled_cp_access(struct kvm_vcpu *vcpu,
 		WARN_ON(1);
 	}
 
-	kvm_err("Unsupported guest CP%d access at: %08lx\n",
-		cp, *vcpu_pc(vcpu));
+	if (params->is_32bit)
+		kvm_err("Unsupported guest CP%d access at: %08lx\n",
+			cp, *vcpu_pc(vcpu));
+	else
+		kvm_err("Unsupported guest CP%d access at: %016lx\n",
+			cp, *vcpu_pc(vcpu));
 	print_sys_reg_instr(params);
 	kvm_inject_undefined(vcpu);
 }
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index a78a5c4..d96a42a 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -77,7 +77,7 @@ void show_pte(struct mm_struct *mm, unsigned long addr)
 
 	pr_alert("pgd = %p\n", mm->pgd);
 	pgd = pgd_offset(mm, addr);
-	pr_alert("[%08lx] *pgd=%016llx", addr, pgd_val(*pgd));
+	pr_alert("[%016lx] *pgd=%016llx", addr, pgd_val(*pgd));
 
 	do {
 		pud_t *pud;
@@ -177,7 +177,7 @@ static void __do_kernel_fault(struct mm_struct *mm, unsigned long addr,
 	 * No handler, we'll have to terminate things with extreme prejudice.
 	 */
 	bust_spinlocks(1);
-	pr_alert("Unable to handle kernel %s at virtual address %08lx\n",
+	pr_alert("Unable to handle kernel %s at virtual address %016lx\n",
 		 (addr < PAGE_SIZE) ? "NULL pointer dereference" :
 		 "paging request", addr);
 
@@ -198,9 +198,14 @@ static void __do_user_fault(struct task_struct *tsk, unsigned long addr,
 	struct siginfo si;
 
 	if (unhandled_signal(tsk, sig) && show_unhandled_signals_ratelimited()) {
-		pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n",
-			tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
-			addr, esr);
+		if (compat_user_mode(regs))
+			pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n",
+				tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
+				addr, esr);
+		else
+			pr_info("%s[%d]: unhandled %s (%d) at 0x%016lx, esr 0x%03x\n",
+				tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
+				addr, esr);
 		show_pte(tsk->mm, addr);
 		show_regs(regs);
 	}
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 17243e4..cbf444c 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -683,9 +683,9 @@ void __init early_fixmap_init(void)
 		pr_warn("pmd %p != %p, %p\n",
 			pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)),
 			fixmap_pmd(fix_to_virt(FIX_BTMAP_END)));
-		pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
+		pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %016lx\n",
 			fix_to_virt(FIX_BTMAP_BEGIN));
-		pr_warn("fix_to_virt(FIX_BTMAP_END):   %08lx\n",
+		pr_warn("fix_to_virt(FIX_BTMAP_END):   %016lx\n",
 			fix_to_virt(FIX_BTMAP_END));
 
 		pr_warn("FIX_BTMAP_END:       %d\n", FIX_BTMAP_END);
-- 
1.9.1

Re: [PATCH 1/1] arm64: Correcting format specifier for printing 64 bit addresses

[Will Deacon]

On Mon, Dec 05, 2016 at 01:39:53PM +0530, Maninder Singh wrote:
> This patch corrects format specifier for printing 64 bit addresses.
> 
> Signed-off-by: Maninder Singh <maninder1.s@samsung.com>
> Signed-off-by: Vaneet Narang <v.narang@samsung.com>
> ---
>  arch/arm64/kernel/signal.c |  2 +-
>  arch/arm64/kvm/sys_regs.c  |  8 ++++++--
>  arch/arm64/mm/fault.c      | 15 ++++++++++-----
>  arch/arm64/mm/mmu.c        |  4 ++--
>  4 files changed, 19 insertions(+), 10 deletions(-)

Any reason not to fix kvm/trace.h too?

Anyway, rest of this looks fine:

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

Will

Re: [PATCH 1/1] arm64: Correcting format specifier for printing 64 bit addresses

[Catalin Marinas]

On Mon, Dec 05, 2016 at 11:24:21AM +0000, Will Deacon wrote:
> On Mon, Dec 05, 2016 at 01:39:53PM +0530, Maninder Singh wrote:
> > This patch corrects format specifier for printing 64 bit addresses.
> > 
> > Signed-off-by: Maninder Singh <maninder1.s@samsung.com>
> > Signed-off-by: Vaneet Narang <v.narang@samsung.com>
> > ---
> >  arch/arm64/kernel/signal.c |  2 +-
> >  arch/arm64/kvm/sys_regs.c  |  8 ++++++--
> >  arch/arm64/mm/fault.c      | 15 ++++++++++-----
> >  arch/arm64/mm/mmu.c        |  4 ++--
> >  4 files changed, 19 insertions(+), 10 deletions(-)
> 
> Any reason not to fix kvm/trace.h too?

If the KVM guys are ok, I can fold the hunk below into this patch:

diff --git a/arch/arm64/kvm/trace.h b/arch/arm64/kvm/trace.h
index 7fb0008c4fa3..e117123d414b 100644
--- a/arch/arm64/kvm/trace.h
+++ b/arch/arm64/kvm/trace.h
@@ -20,7 +20,7 @@ TRACE_EVENT(kvm_wfx_arm64,
 		__entry->is_wfe  = is_wfe;
 	),
 
-	TP_printk("guest executed wf%c at: 0x%08lx",
+	TP_printk("guest executed wf%c at: 0x%016lx",
 		  __entry->is_wfe ? 'e' : 'i', __entry->vcpu_pc)
 );
 
@@ -40,7 +40,7 @@ TRACE_EVENT(kvm_hvc_arm64,
 		__entry->imm = imm;
 	),
 
-	TP_printk("HVC at 0x%08lx (r0: 0x%08lx, imm: 0x%lx)",
+	TP_printk("HVC at 0x%016lx (r0: 0x%016lx, imm: 0x%lx)",
 		  __entry->vcpu_pc, __entry->r0, __entry->imm)
 );
 
@@ -131,7 +131,7 @@ TRACE_EVENT(trap_reg,
 		__entry->write_value = write_value;
 	),
 
-	TP_printk("%s %s reg %d (0x%08llx)", __entry->fn,  __entry->is_write?"write to":"read from", __entry->reg, __entry->write_value)
+	TP_printk("%s %s reg %d (0x%016llx)", __entry->fn,  __entry->is_write?"write to":"read from", __entry->reg, __entry->write_value)
 );
 
 TRACE_EVENT(kvm_handle_sys_reg,

-- 
Catalin

Re: [PATCH 1/1] arm64: Correcting format specifier for printing 64 bit addresses

[Will Deacon]

On Tue, Dec 06, 2016 at 03:26:37PM +0000, Catalin Marinas wrote:
> On Mon, Dec 05, 2016 at 11:24:21AM +0000, Will Deacon wrote:
> > On Mon, Dec 05, 2016 at 01:39:53PM +0530, Maninder Singh wrote:
> > > This patch corrects format specifier for printing 64 bit addresses.
> > > 
> > > Signed-off-by: Maninder Singh <maninder1.s@samsung.com>
> > > Signed-off-by: Vaneet Narang <v.narang@samsung.com>
> > > ---
> > >  arch/arm64/kernel/signal.c |  2 +-
> > >  arch/arm64/kvm/sys_regs.c  |  8 ++++++--
> > >  arch/arm64/mm/fault.c      | 15 ++++++++++-----
> > >  arch/arm64/mm/mmu.c        |  4 ++--
> > >  4 files changed, 19 insertions(+), 10 deletions(-)
> > 
> > Any reason not to fix kvm/trace.h too?
> 
> If the KVM guys are ok, I can fold the hunk below into this patch:
> 
> diff --git a/arch/arm64/kvm/trace.h b/arch/arm64/kvm/trace.h
> index 7fb0008c4fa3..e117123d414b 100644
> --- a/arch/arm64/kvm/trace.h
> +++ b/arch/arm64/kvm/trace.h
> @@ -20,7 +20,7 @@ TRACE_EVENT(kvm_wfx_arm64,
>  		__entry->is_wfe  = is_wfe;
>  	),
>  
> -	TP_printk("guest executed wf%c at: 0x%08lx",
> +	TP_printk("guest executed wf%c at: 0x%016lx",
>  		  __entry->is_wfe ? 'e' : 'i', __entry->vcpu_pc)
>  );
>  
> @@ -40,7 +40,7 @@ TRACE_EVENT(kvm_hvc_arm64,
>  		__entry->imm = imm;
>  	),
>  
> -	TP_printk("HVC at 0x%08lx (r0: 0x%08lx, imm: 0x%lx)",
> +	TP_printk("HVC at 0x%016lx (r0: 0x%016lx, imm: 0x%lx)",

Not sure we need the 016 prefix for r0.

Will

Re: [PATCH 1/1] arm64: Correcting format specifier for printing 64 bit addresses

[Christoffer Dall]

On Mon, Dec 05, 2016 at 01:39:53PM +0530, Maninder Singh wrote:
> This patch corrects format specifier for printing 64 bit addresses.
> 
> Signed-off-by: Maninder Singh <maninder1.s@samsung.com>
> Signed-off-by: Vaneet Narang <v.narang@samsung.com>
> ---
>  arch/arm64/kernel/signal.c |  2 +-
>  arch/arm64/kvm/sys_regs.c  |  8 ++++++--
>  arch/arm64/mm/fault.c      | 15 ++++++++++-----
>  arch/arm64/mm/mmu.c        |  4 ++--
>  4 files changed, 19 insertions(+), 10 deletions(-)
> 
> diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
> index c7b6de6..c89d5fd 100644
> --- a/arch/arm64/kernel/signal.c
> +++ b/arch/arm64/kernel/signal.c
> @@ -155,7 +155,7 @@ asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
>  
>  badframe:
>  	if (show_unhandled_signals)
> -		pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
> +		pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%016llx sp=%016llx\n",
>  				    current->comm, task_pid_nr(current), __func__,
>  				    regs->pc, regs->sp);
>  	force_sig(SIGSEGV, current);
> diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
> index 87e7e66..89bf5c1 100644
> --- a/arch/arm64/kvm/sys_regs.c
> +++ b/arch/arm64/kvm/sys_regs.c
> @@ -1554,8 +1554,12 @@ static void unhandled_cp_access(struct kvm_vcpu *vcpu,
>  		WARN_ON(1);
>  	}
>  
> -	kvm_err("Unsupported guest CP%d access at: %08lx\n",
> -		cp, *vcpu_pc(vcpu));
> +	if (params->is_32bit)
> +		kvm_err("Unsupported guest CP%d access at: %08lx\n",
> +			cp, *vcpu_pc(vcpu));
> +	else
> +		kvm_err("Unsupported guest CP%d access at: %016lx\n",
> +			cp, *vcpu_pc(vcpu));

It feels a bit much to me to have an if-statement to differentiate the
number of leading zeros, so if it's important to always have fixed
widths then I would just use %016lx in both cases.

>  	print_sys_reg_instr(params);
>  	kvm_inject_undefined(vcpu);
>  }
> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
> index a78a5c4..d96a42a 100644
> --- a/arch/arm64/mm/fault.c
> +++ b/arch/arm64/mm/fault.c
> @@ -77,7 +77,7 @@ void show_pte(struct mm_struct *mm, unsigned long addr)
>  
>  	pr_alert("pgd = %p\n", mm->pgd);
>  	pgd = pgd_offset(mm, addr);
> -	pr_alert("[%08lx] *pgd=%016llx", addr, pgd_val(*pgd));
> +	pr_alert("[%016lx] *pgd=%016llx", addr, pgd_val(*pgd));
>  
>  	do {
>  		pud_t *pud;
> @@ -177,7 +177,7 @@ static void __do_kernel_fault(struct mm_struct *mm, unsigned long addr,
>  	 * No handler, we'll have to terminate things with extreme prejudice.
>  	 */
>  	bust_spinlocks(1);
> -	pr_alert("Unable to handle kernel %s at virtual address %08lx\n",
> +	pr_alert("Unable to handle kernel %s at virtual address %016lx\n",
>  		 (addr < PAGE_SIZE) ? "NULL pointer dereference" :
>  		 "paging request", addr);
>  
> @@ -198,9 +198,14 @@ static void __do_user_fault(struct task_struct *tsk, unsigned long addr,
>  	struct siginfo si;
>  
>  	if (unhandled_signal(tsk, sig) && show_unhandled_signals_ratelimited()) {
> -		pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n",
> -			tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
> -			addr, esr);
> +		if (compat_user_mode(regs))
> +			pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n",
> +				tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
> +				addr, esr);
> +		else
> +			pr_info("%s[%d]: unhandled %s (%d) at 0x%016lx, esr 0x%03x\n",
> +				tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
> +				addr, esr);

same here.

Thanks,
-Christoffer

Re: [PATCH 1/1] arm64: Correcting format specifier for printing 64 bit addresses

[Robin Murphy]

On 06/12/16 16:11, Christoffer Dall wrote:
> On Mon, Dec 05, 2016 at 01:39:53PM +0530, Maninder Singh wrote:
>> This patch corrects format specifier for printing 64 bit addresses.
>>
>> Signed-off-by: Maninder Singh <maninder1.s@samsung.com>
>> Signed-off-by: Vaneet Narang <v.narang@samsung.com>
>> ---
>>  arch/arm64/kernel/signal.c |  2 +-
>>  arch/arm64/kvm/sys_regs.c  |  8 ++++++--
>>  arch/arm64/mm/fault.c      | 15 ++++++++++-----
>>  arch/arm64/mm/mmu.c        |  4 ++--
>>  4 files changed, 19 insertions(+), 10 deletions(-)
>>
>> diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
>> index c7b6de6..c89d5fd 100644
>> --- a/arch/arm64/kernel/signal.c
>> +++ b/arch/arm64/kernel/signal.c
>> @@ -155,7 +155,7 @@ asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
>>  
>>  badframe:
>>  	if (show_unhandled_signals)
>> -		pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
>> +		pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%016llx sp=%016llx\n",
>>  				    current->comm, task_pid_nr(current), __func__,
>>  				    regs->pc, regs->sp);
>>  	force_sig(SIGSEGV, current);
>> diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
>> index 87e7e66..89bf5c1 100644
>> --- a/arch/arm64/kvm/sys_regs.c
>> +++ b/arch/arm64/kvm/sys_regs.c
>> @@ -1554,8 +1554,12 @@ static void unhandled_cp_access(struct kvm_vcpu *vcpu,
>>  		WARN_ON(1);
>>  	}
>>  
>> -	kvm_err("Unsupported guest CP%d access at: %08lx\n",
>> -		cp, *vcpu_pc(vcpu));
>> +	if (params->is_32bit)
>> +		kvm_err("Unsupported guest CP%d access at: %08lx\n",
>> +			cp, *vcpu_pc(vcpu));
>> +	else
>> +		kvm_err("Unsupported guest CP%d access at: %016lx\n",
>> +			cp, *vcpu_pc(vcpu));
> 
> It feels a bit much to me to have an if-statement to differentiate the
> number of leading zeros, so if it's important to always have fixed
> widths then I would just use %016lx in both cases.

Actually, it looks like vsnprintf does support the '*' field width
specifier, so even if the format _is_ critical there's still no reason
to have such duplicated code.

Robin.

>>  	print_sys_reg_instr(params);
>>  	kvm_inject_undefined(vcpu);
>>  }
>> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
>> index a78a5c4..d96a42a 100644
>> --- a/arch/arm64/mm/fault.c
>> +++ b/arch/arm64/mm/fault.c
>> @@ -77,7 +77,7 @@ void show_pte(struct mm_struct *mm, unsigned long addr)
>>  
>>  	pr_alert("pgd = %p\n", mm->pgd);
>>  	pgd = pgd_offset(mm, addr);
>> -	pr_alert("[%08lx] *pgd=%016llx", addr, pgd_val(*pgd));
>> +	pr_alert("[%016lx] *pgd=%016llx", addr, pgd_val(*pgd));
>>  
>>  	do {
>>  		pud_t *pud;
>> @@ -177,7 +177,7 @@ static void __do_kernel_fault(struct mm_struct *mm, unsigned long addr,
>>  	 * No handler, we'll have to terminate things with extreme prejudice.
>>  	 */
>>  	bust_spinlocks(1);
>> -	pr_alert("Unable to handle kernel %s at virtual address %08lx\n",
>> +	pr_alert("Unable to handle kernel %s at virtual address %016lx\n",
>>  		 (addr < PAGE_SIZE) ? "NULL pointer dereference" :
>>  		 "paging request", addr);
>>  
>> @@ -198,9 +198,14 @@ static void __do_user_fault(struct task_struct *tsk, unsigned long addr,
>>  	struct siginfo si;
>>  
>>  	if (unhandled_signal(tsk, sig) && show_unhandled_signals_ratelimited()) {
>> -		pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n",
>> -			tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
>> -			addr, esr);
>> +		if (compat_user_mode(regs))
>> +			pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n",
>> +				tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
>> +				addr, esr);
>> +		else
>> +			pr_info("%s[%d]: unhandled %s (%d) at 0x%016lx, esr 0x%03x\n",
>> +				tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
>> +				addr, esr);
> 
> same here.
> 
> Thanks,
> -Christoffer
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 

Re: [PATCH 1/1] arm64: Correcting format specifier for printing 64 bit addresses

[Robin Murphy]

On 05/12/16 08:09, Maninder Singh wrote:
> This patch corrects format specifier for printing 64 bit addresses.
> 
> Signed-off-by: Maninder Singh <maninder1.s@samsung.com>
> Signed-off-by: Vaneet Narang <v.narang@samsung.com>
> ---
>  arch/arm64/kernel/signal.c |  2 +-
>  arch/arm64/kvm/sys_regs.c  |  8 ++++++--
>  arch/arm64/mm/fault.c      | 15 ++++++++++-----
>  arch/arm64/mm/mmu.c        |  4 ++--
>  4 files changed, 19 insertions(+), 10 deletions(-)
> 
> diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
> index c7b6de6..c89d5fd 100644
> --- a/arch/arm64/kernel/signal.c
> +++ b/arch/arm64/kernel/signal.c
> @@ -155,7 +155,7 @@ asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
>  
>  badframe:
>  	if (show_unhandled_signals)
> -		pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
> +		pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%016llx sp=%016llx\n",
>  				    current->comm, task_pid_nr(current), __func__,
>  				    regs->pc, regs->sp);
>  	force_sig(SIGSEGV, current);
> diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
> index 87e7e66..89bf5c1 100644
> --- a/arch/arm64/kvm/sys_regs.c
> +++ b/arch/arm64/kvm/sys_regs.c
> @@ -1554,8 +1554,12 @@ static void unhandled_cp_access(struct kvm_vcpu *vcpu,
>  		WARN_ON(1);
>  	}
>  
> -	kvm_err("Unsupported guest CP%d access at: %08lx\n",
> -		cp, *vcpu_pc(vcpu));
> +	if (params->is_32bit)
> +		kvm_err("Unsupported guest CP%d access at: %08lx\n",
> +			cp, *vcpu_pc(vcpu));
> +	else
> +		kvm_err("Unsupported guest CP%d access at: %016lx\n",
> +			cp, *vcpu_pc(vcpu));

As with the other patch - use '%0*lx' in these cases rather than
pointlessly duplicating everything.

Robin.

>  	print_sys_reg_instr(params);
>  	kvm_inject_undefined(vcpu);
>  }
> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
> index a78a5c4..d96a42a 100644
> --- a/arch/arm64/mm/fault.c
> +++ b/arch/arm64/mm/fault.c
> @@ -77,7 +77,7 @@ void show_pte(struct mm_struct *mm, unsigned long addr)
>  
>  	pr_alert("pgd = %p\n", mm->pgd);
>  	pgd = pgd_offset(mm, addr);
> -	pr_alert("[%08lx] *pgd=%016llx", addr, pgd_val(*pgd));
> +	pr_alert("[%016lx] *pgd=%016llx", addr, pgd_val(*pgd));
>  
>  	do {
>  		pud_t *pud;
> @@ -177,7 +177,7 @@ static void __do_kernel_fault(struct mm_struct *mm, unsigned long addr,
>  	 * No handler, we'll have to terminate things with extreme prejudice.
>  	 */
>  	bust_spinlocks(1);
> -	pr_alert("Unable to handle kernel %s at virtual address %08lx\n",
> +	pr_alert("Unable to handle kernel %s at virtual address %016lx\n",
>  		 (addr < PAGE_SIZE) ? "NULL pointer dereference" :
>  		 "paging request", addr);
>  
> @@ -198,9 +198,14 @@ static void __do_user_fault(struct task_struct *tsk, unsigned long addr,
>  	struct siginfo si;
>  
>  	if (unhandled_signal(tsk, sig) && show_unhandled_signals_ratelimited()) {
> -		pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n",
> -			tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
> -			addr, esr);
> +		if (compat_user_mode(regs))
> +			pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n",
> +				tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
> +				addr, esr);
> +		else
> +			pr_info("%s[%d]: unhandled %s (%d) at 0x%016lx, esr 0x%03x\n",
> +				tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
> +				addr, esr);
>  		show_pte(tsk->mm, addr);
>  		show_regs(regs);
>  	}
> diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
> index 17243e4..cbf444c 100644
> --- a/arch/arm64/mm/mmu.c
> +++ b/arch/arm64/mm/mmu.c
> @@ -683,9 +683,9 @@ void __init early_fixmap_init(void)
>  		pr_warn("pmd %p != %p, %p\n",
>  			pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)),
>  			fixmap_pmd(fix_to_virt(FIX_BTMAP_END)));
> -		pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
> +		pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %016lx\n",
>  			fix_to_virt(FIX_BTMAP_BEGIN));
> -		pr_warn("fix_to_virt(FIX_BTMAP_END):   %08lx\n",
> +		pr_warn("fix_to_virt(FIX_BTMAP_END):   %016lx\n",
>  			fix_to_virt(FIX_BTMAP_END));
>  
>  		pr_warn("FIX_BTMAP_END:       %d\n", FIX_BTMAP_END);
> 

Re: [PATCH 1/1] arm64: Correcting format specifier for printing 64 bit addresses

[Paolo Bonzini]

On 06/12/2016 17:11, Christoffer Dall wrote:
> +		kvm_err("Unsupported guest CP%d access at: %08lx\n",
> +			cp, *vcpu_pc(vcpu));
> +	else
> +		kvm_err("Unsupported guest CP%d access at: %016lx\n",
> +			cp, *vcpu_pc(vcpu));
> 
> It feels a bit much to me to have an if-statement to differentiate the
> number of leading zeros, so if it's important to always have fixed
> widths then I would just use %016lx in both cases.

Really, this is just a debugging message.  Just use "0x%lx" and let's
stop bikeshedding. :)

Paolo

[PATCH 1/1] arm64: Correcting format specifier for printing 64 bit addresses

[Maninder Singh]

This patch corrects format specifier for printing 64 bit addresses.

Signed-off-by: Maninder Singh <maninder1.s@samsung.com>
Signed-off-by: Vaneet Narang <v.narang@samsung.com>
---
 arch/arm64/kernel/signal.c |  2 +-
 arch/arm64/kvm/sys_regs.c  |  8 ++++++--
 arch/arm64/mm/fault.c      | 15 ++++++++++-----
 arch/arm64/mm/mmu.c        |  4 ++--
 4 files changed, 19 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
index c7b6de6..c89d5fd 100644
--- a/arch/arm64/kernel/signal.c
+++ b/arch/arm64/kernel/signal.c
@@ -155,7 +155,7 @@ asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
 
 badframe:
 	if (show_unhandled_signals)
-		pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
+		pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%016llx sp=%016llx\n",
 				    current->comm, task_pid_nr(current), __func__,
 				    regs->pc, regs->sp);
 	force_sig(SIGSEGV, current);
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 87e7e66..89bf5c1 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1554,8 +1554,12 @@ static void unhandled_cp_access(struct kvm_vcpu *vcpu,
 		WARN_ON(1);
 	}
 
-	kvm_err("Unsupported guest CP%d access at: %08lx\n",
-		cp, *vcpu_pc(vcpu));
+	if (params->is_32bit)
+		kvm_err("Unsupported guest CP%d access at: %08lx\n",
+			cp, *vcpu_pc(vcpu));
+	else
+		kvm_err("Unsupported guest CP%d access at: %016lx\n",
+			cp, *vcpu_pc(vcpu));
 	print_sys_reg_instr(params);
 	kvm_inject_undefined(vcpu);
 }
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index a78a5c4..d96a42a 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -77,7 +77,7 @@ void show_pte(struct mm_struct *mm, unsigned long addr)
 
 	pr_alert("pgd = %p\n", mm->pgd);
 	pgd = pgd_offset(mm, addr);
-	pr_alert("[%08lx] *pgd=%016llx", addr, pgd_val(*pgd));
+	pr_alert("[%016lx] *pgd=%016llx", addr, pgd_val(*pgd));
 
 	do {
 		pud_t *pud;
@@ -177,7 +177,7 @@ static void __do_kernel_fault(struct mm_struct *mm, unsigned long addr,
 	 * No handler, we'll have to terminate things with extreme prejudice.
 	 */
 	bust_spinlocks(1);
-	pr_alert("Unable to handle kernel %s at virtual address %08lx\n",
+	pr_alert("Unable to handle kernel %s at virtual address %016lx\n",
 		 (addr < PAGE_SIZE) ? "NULL pointer dereference" :
 		 "paging request", addr);
 
@@ -198,9 +198,14 @@ static void __do_user_fault(struct task_struct *tsk, unsigned long addr,
 	struct siginfo si;
 
 	if (unhandled_signal(tsk, sig) && show_unhandled_signals_ratelimited()) {
-		pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n",
-			tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
-			addr, esr);
+		if (compat_user_mode(regs))
+			pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n",
+				tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
+				addr, esr);
+		else
+			pr_info("%s[%d]: unhandled %s (%d) at 0x%016lx, esr 0x%03x\n",
+				tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
+				addr, esr);
 		show_pte(tsk->mm, addr);
 		show_regs(regs);
 	}
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 17243e4..cbf444c 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -683,9 +683,9 @@ void __init early_fixmap_init(void)
 		pr_warn("pmd %p != %p, %p\n",
 			pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)),
 			fixmap_pmd(fix_to_virt(FIX_BTMAP_END)));
-		pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
+		pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %016lx\n",
 			fix_to_virt(FIX_BTMAP_BEGIN));
-		pr_warn("fix_to_virt(FIX_BTMAP_END):   %08lx\n",
+		pr_warn("fix_to_virt(FIX_BTMAP_END):   %016lx\n",
 			fix_to_virt(FIX_BTMAP_END));
 
 		pr_warn("FIX_BTMAP_END:       %d\n", FIX_BTMAP_END);
-- 
1.9.1