Re: [tip:x86/urgent] x86: fix set_fixmap to use phys_addr_t

[Masami Hiramatsu <mhiramat@redhat.com>]

Mathieu Desnoyers wrote:
> * Masami Hiramatsu (mhiramat@redhat.com) wrote:
>> Masami Hiramatsu wrote:
>>> Commit-ID:  189cdc2b41fce3a780a6f3aa963cc4e8114aec6b
>>> Gitweb:     http://git.kernel.org/tip/189cdc2b41fce3a780a6f3aa963cc4e8114aec6b
>>> Author:     Masami Hiramatsu <mhiramat@redhat.com>
>>> AuthorDate: Thu, 9 Apr 2009 10:55:33 -0700
>>> Committer:  Ingo Molnar <mingo@elte.hu>
>>> CommitDate: Fri, 10 Apr 2009 15:52:59 +0200
>>>
>>> x86: fix set_fixmap to use phys_addr_t
>>>
>>> Impact: fix kprobes crash on 32-bit with RAM above 4G
>>>
>>> Use phys_addr_t for receiving a physical address argument
>>> instead of unsigned long. This allows fixmap to handle
>>> pages higher than 4GB on x86-32.
>>>
>>> Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
>>> Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
>> I thought I had to update ioremap.c too...
>> Anyway, here is the ioremap.c update. If you think it is useful,
>> please merge it.
>>
>> Thank you,
>> ----
>>
>> x86: fix early_ioremap and early_set_fixmap to handle over 4G pages
>>
>> From: Masami Hiramatsu <mhiramat@redhat.com>
>>
>> Impact: Allow early_ioremap to handle over 4G pages
>>
>> Use phys_addr_t and resource_size_t for receiving a physical
>> address argument instead of unsigned long in early_set_fixmap
>> and early_ioremap. This allows early_ioremap to handle
>> pages higher than 4GB on x86-32 with PAE.
>>
>> Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
>> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
>> Cc: Ingo Molnar <mingo@elte.hu>
>> ---
>>
>>  arch/x86/include/asm/io.h |    6 ++++--
>>  arch/x86/mm/ioremap.c     |   23 +++++++++++++----------
>>  2 files changed, 17 insertions(+), 12 deletions(-)
>>
>>
>> diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
>> index e5383e3..7373932 100644
>> --- a/arch/x86/include/asm/io.h
>> +++ b/arch/x86/include/asm/io.h
>> @@ -193,8 +193,10 @@ extern void __iomem *ioremap_wc(resource_size_t offset, unsigned long size);
>>   */
>>  extern void early_ioremap_init(void);
>>  extern void early_ioremap_reset(void);
>> -extern void __iomem *early_ioremap(unsigned long offset, unsigned long size);
>> -extern void __iomem *early_memremap(unsigned long offset, unsigned long size);
>> +extern void __iomem *early_ioremap(resource_size_t phys_addr,
>> +				   unsigned long size);
>> +extern void __iomem *early_memremap(resource_size_t phys_addr,
>> +				    unsigned long size);
> 
> 
> Nitpick : those second lines are not aligned with each other. The rest
> has my

hmm, after being patched, those are aligned to the first line...

---
extern void __iomem *early_ioremap(resource_size_t phys_addr,
				   unsigned long size);
extern void __iomem *early_memremap(resource_size_t phys_addr,
				    unsigned long size);
---

Thank you,

> 
> Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
> 
> Thanks !
> 
> Mathieu
> 
>>  extern void early_iounmap(void __iomem *addr, unsigned long size);
>>
>>  #define IO_SPACE_LIMIT 0xffff
>> diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
>> index 0dfa09d..09daebf 100644
>> --- a/arch/x86/mm/ioremap.c
>> +++ b/arch/x86/mm/ioremap.c
>> @@ -547,7 +547,7 @@ void __init early_ioremap_reset(void)
>>  }
>>
>>  static void __init __early_set_fixmap(enum fixed_addresses idx,
>> -				   unsigned long phys, pgprot_t flags)
>> +				      phys_addr_t phys, pgprot_t flags)
>>  {
>>  	unsigned long addr = __fix_to_virt(idx);
>>  	pte_t *pte;
>> @@ -566,7 +566,7 @@ static void __init __early_set_fixmap(enum fixed_addresses idx,
>>  }
>>
>>  static inline void __init early_set_fixmap(enum fixed_addresses idx,
>> -					   unsigned long phys, pgprot_t prot)
>> +					   phys_addr_t phys, pgprot_t prot)
>>  {
>>  	if (after_paging_init)
>>  		__set_fixmap(idx, phys, prot);
>> @@ -607,9 +607,10 @@ static int __init check_early_ioremap_leak(void)
>>  late_initcall(check_early_ioremap_leak);
>>
>>  static void __init __iomem *
>> -__early_ioremap(unsigned long phys_addr, unsigned long size, pgprot_t prot)
>> +__early_ioremap(resource_size_t phys_addr, unsigned long size, pgprot_t prot)
>>  {
>> -	unsigned long offset, last_addr;
>> +	unsigned long offset;
>> +	resource_size_t last_addr;
>>  	unsigned int nrpages;
>>  	enum fixed_addresses idx0, idx;
>>  	int i, slot;
>> @@ -625,15 +626,15 @@ __early_ioremap(unsigned long phys_addr, unsigned long size, pgprot_t prot)
>>  	}
>>
>>  	if (slot < 0) {
>> -		printk(KERN_INFO "early_iomap(%08lx, %08lx) not found slot\n",
>> -			 phys_addr, size);
>> +		printk(KERN_INFO "early_iomap(%08llx, %08lx) not found slot\n",
>> +			 (u64)phys_addr, size);
>>  		WARN_ON(1);
>>  		return NULL;
>>  	}
>>
>>  	if (early_ioremap_debug) {
>> -		printk(KERN_INFO "early_ioremap(%08lx, %08lx) [%d] => ",
>> -		       phys_addr, size, slot);
>> +		printk(KERN_INFO "early_ioremap(%08llx, %08lx) [%d] => ",
>> +		       (u64)phys_addr, size, slot);
>>  		dump_stack();
>>  	}
>>
>> @@ -680,13 +681,15 @@ __early_ioremap(unsigned long phys_addr, unsigned long size, pgprot_t prot)
>>  }
>>
>>  /* Remap an IO device */
>> -void __init __iomem *early_ioremap(unsigned long phys_addr, unsigned long size)
>> +void __init __iomem *
>> +early_ioremap(resource_size_t phys_addr, unsigned long size)
>>  {
>>  	return __early_ioremap(phys_addr, size, PAGE_KERNEL_IO);
>>  }
>>
>>  /* Remap memory */
>> -void __init __iomem *early_memremap(unsigned long phys_addr, unsigned long size)
>> +void __init __iomem *
>> +early_memremap(resource_size_t phys_addr, unsigned long size)
>>  {
>>  	return __early_ioremap(phys_addr, size, PAGE_KERNEL);
>>  }
>> -- 
>> Masami Hiramatsu
>>
>> Software Engineer
>> Hitachi Computer Products (America) Inc.
>> Software Solutions Division
>>
>> e-mail: mhiramat@redhat.com
>>
> 

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@redhat.com