Re: [PATCH v2 04/20] vmcore: allocate buffer for ELF headers on page-size alignment

2013-03-06 Thread HATAYAMA Daisuke 
From: Zhang Yanfei 
Subject: Re: [PATCH v2 04/20] vmcore: allocate buffer for ELF headers on 
page-size alignment
Date: Wed, 6 Mar 2013 14:57:50 +0800

> 于 2013年03月02日 16:36, HATAYAMA Daisuke 写道:
>> Allocate buffer for ELF headers on page-size aligned boudary to
>> satisfy mmap() requirement. For this, __get_free_pages() is used
>> instead of kmalloc().
>> 
>> Also, later patch will decrease actually used buffer size for ELF
>> headers, so it's necessary to keep original buffer size and actually
>> used buffer size separately. elfcorebuf_sz_orig keeps the original one
>> and elfcorebuf_sz the actually used one.
>> 
>> Signed-off-by: HATAYAMA Daisuke 
>> ---
>> 
>>  fs/proc/vmcore.c |   30 +-
>>  1 files changed, 21 insertions(+), 9 deletions(-)
>> 



>> @@ -665,26 +671,31 @@ static int __init parse_crash_elf32_headers(void)
>>  
>>  /* Read in all elf headers. */
>>  elfcorebuf_sz = ehdr.e_phoff + ehdr.e_phnum * sizeof(Elf32_Phdr);
>> -elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
>> +elfcorebuf_sz_orig = elfcorebuf_sz;
>> +elfcorebuf = (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
>> +   get_order(elfcorebuf_sz));
> 
> Why not elfcorebuf_sz_orig here?
> 

Thanks. I'll fix this.

Thanks.
HATAYAMA, Daisuke

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Re: [PATCH v2 04/20] vmcore: allocate buffer for ELF headers on page-size alignment

2013-03-06 Thread HATAYAMA Daisuke 
From: Zhang Yanfei zhangyan...@cn.fujitsu.com
Subject: Re: [PATCH v2 04/20] vmcore: allocate buffer for ELF headers on 
page-size alignment
Date: Wed, 6 Mar 2013 14:57:50 +0800

 于 2013年03月02日 16:36, HATAYAMA Daisuke 写道:
 Allocate buffer for ELF headers on page-size aligned boudary to
 satisfy mmap() requirement. For this, __get_free_pages() is used
 instead of kmalloc().
 
 Also, later patch will decrease actually used buffer size for ELF
 headers, so it's necessary to keep original buffer size and actually
 used buffer size separately. elfcorebuf_sz_orig keeps the original one
 and elfcorebuf_sz the actually used one.
 
 Signed-off-by: HATAYAMA Daisuke d.hatay...@jp.fujitsu.com
 ---
 
  fs/proc/vmcore.c |   30 +-
  1 files changed, 21 insertions(+), 9 deletions(-)
 



 @@ -665,26 +671,31 @@ static int __init parse_crash_elf32_headers(void)
  
  /* Read in all elf headers. */
  elfcorebuf_sz = ehdr.e_phoff + ehdr.e_phnum * sizeof(Elf32_Phdr);
 -elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
 +elfcorebuf_sz_orig = elfcorebuf_sz;
 +elfcorebuf = (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
 +   get_order(elfcorebuf_sz));
 
 Why not elfcorebuf_sz_orig here?
 

Thanks. I'll fix this.

Thanks.
HATAYAMA, Daisuke

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Re: [PATCH v2 04/20] vmcore: allocate buffer for ELF headers on page-size alignment

2013-03-05 Thread Zhang Yanfei 
于 2013年03月02日 16:36, HATAYAMA Daisuke 写道:
> Allocate buffer for ELF headers on page-size aligned boudary to
> satisfy mmap() requirement. For this, __get_free_pages() is used
> instead of kmalloc().
> 
> Also, later patch will decrease actually used buffer size for ELF
> headers, so it's necessary to keep original buffer size and actually
> used buffer size separately. elfcorebuf_sz_orig keeps the original one
> and elfcorebuf_sz the actually used one.
> 
> Signed-off-by: HATAYAMA Daisuke 
> ---
> 
>  fs/proc/vmcore.c |   30 +-
>  1 files changed, 21 insertions(+), 9 deletions(-)
> 
> diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
> index b5c9e33..1b02d01 100644
> --- a/fs/proc/vmcore.c
> +++ b/fs/proc/vmcore.c
> @@ -31,6 +31,7 @@ static LIST_HEAD(vmcore_list);
>  /* Stores the pointer to the buffer containing kernel elf core headers. */
>  static char *elfcorebuf;
>  static size_t elfcorebuf_sz;
> +static size_t elfcorebuf_sz_orig;
>  
>  /* Total size of vmcore file. */
>  static u64 vmcore_size;
> @@ -610,26 +611,31 @@ static int __init parse_crash_elf64_headers(void)
>  
>   /* Read in all elf headers. */
>   elfcorebuf_sz = ehdr.e_phoff + ehdr.e_phnum * sizeof(Elf64_Phdr);
> - elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
> + elfcorebuf_sz_orig = elfcorebuf_sz;
> + elfcorebuf = (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
> +get_order(elfcorebuf_sz_orig));
>   if (!elfcorebuf)
>   return -ENOMEM;
>   addr = elfcorehdr_addr;
>   rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, , 0);
>   if (rc < 0) {
> - kfree(elfcorebuf);
> + free_pages((unsigned long)elfcorebuf,
> +get_order(elfcorebuf_sz_orig));
>   return rc;
>   }
>  
>   /* Merge all PT_NOTE headers into one. */
>   rc = merge_note_headers_elf64(elfcorebuf, _sz, _list);
>   if (rc) {
> - kfree(elfcorebuf);
> + free_pages((unsigned long)elfcorebuf,
> +get_order(elfcorebuf_sz_orig));
>   return rc;
>   }
>   rc = process_ptload_program_headers_elf64(elfcorebuf, elfcorebuf_sz,
>   _list);
>   if (rc) {
> - kfree(elfcorebuf);
> + free_pages((unsigned long)elfcorebuf,
> +get_order(elfcorebuf_sz_orig));
>   return rc;
>   }
>   set_vmcore_list_offsets_elf64(elfcorebuf, _list);
> @@ -665,26 +671,31 @@ static int __init parse_crash_elf32_headers(void)
>  
>   /* Read in all elf headers. */
>   elfcorebuf_sz = ehdr.e_phoff + ehdr.e_phnum * sizeof(Elf32_Phdr);
> - elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
> + elfcorebuf_sz_orig = elfcorebuf_sz;
> + elfcorebuf = (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
> +get_order(elfcorebuf_sz));

Why not elfcorebuf_sz_orig here?

>   if (!elfcorebuf)
>   return -ENOMEM;
>   addr = elfcorehdr_addr;
>   rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, , 0);
>   if (rc < 0) {
> - kfree(elfcorebuf);
> + free_pages((unsigned long)elfcorebuf,
> +get_order(elfcorebuf_sz_orig));
>   return rc;
>   }
>  
>   /* Merge all PT_NOTE headers into one. */
>   rc = merge_note_headers_elf32(elfcorebuf, _sz, _list);
>   if (rc) {
> - kfree(elfcorebuf);
> + free_pages((unsigned long)elfcorebuf,
> +get_order(elfcorebuf_sz_orig));
>   return rc;
>   }
>   rc = process_ptload_program_headers_elf32(elfcorebuf, elfcorebuf_sz,
>   _list);
>   if (rc) {
> - kfree(elfcorebuf);
> + free_pages((unsigned long)elfcorebuf,
> +get_order(elfcorebuf_sz_orig));
>   return rc;
>   }
>   set_vmcore_list_offsets_elf32(elfcorebuf, _list);
> @@ -766,7 +777,8 @@ void vmcore_cleanup(void)
>   list_del(>list);
>   kfree(m);
>   }
> - kfree(elfcorebuf);
> + free_pages((unsigned long)elfcorebuf,
> +get_order(elfcorebuf_sz_orig));
>   elfcorebuf = NULL;
>  }
>  EXPORT_SYMBOL_GPL(vmcore_cleanup);
> 
> 
> ___
> kexec mailing list
> ke...@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/kexec
> 

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Re: [PATCH v2 04/20] vmcore: allocate buffer for ELF headers on page-size alignment

2013-03-05 Thread Zhang Yanfei 
于 2013年03月02日 16:36, HATAYAMA Daisuke 写道:
 Allocate buffer for ELF headers on page-size aligned boudary to
 satisfy mmap() requirement. For this, __get_free_pages() is used
 instead of kmalloc().
 
 Also, later patch will decrease actually used buffer size for ELF
 headers, so it's necessary to keep original buffer size and actually
 used buffer size separately. elfcorebuf_sz_orig keeps the original one
 and elfcorebuf_sz the actually used one.
 
 Signed-off-by: HATAYAMA Daisuke d.hatay...@jp.fujitsu.com
 ---
 
  fs/proc/vmcore.c |   30 +-
  1 files changed, 21 insertions(+), 9 deletions(-)
 
 diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
 index b5c9e33..1b02d01 100644
 --- a/fs/proc/vmcore.c
 +++ b/fs/proc/vmcore.c
 @@ -31,6 +31,7 @@ static LIST_HEAD(vmcore_list);
  /* Stores the pointer to the buffer containing kernel elf core headers. */
  static char *elfcorebuf;
  static size_t elfcorebuf_sz;
 +static size_t elfcorebuf_sz_orig;
  
  /* Total size of vmcore file. */
  static u64 vmcore_size;
 @@ -610,26 +611,31 @@ static int __init parse_crash_elf64_headers(void)
  
   /* Read in all elf headers. */
   elfcorebuf_sz = ehdr.e_phoff + ehdr.e_phnum * sizeof(Elf64_Phdr);
 - elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
 + elfcorebuf_sz_orig = elfcorebuf_sz;
 + elfcorebuf = (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
 +get_order(elfcorebuf_sz_orig));
   if (!elfcorebuf)
   return -ENOMEM;
   addr = elfcorehdr_addr;
   rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, addr, 0);
   if (rc  0) {
 - kfree(elfcorebuf);
 + free_pages((unsigned long)elfcorebuf,
 +get_order(elfcorebuf_sz_orig));
   return rc;
   }
  
   /* Merge all PT_NOTE headers into one. */
   rc = merge_note_headers_elf64(elfcorebuf, elfcorebuf_sz, vmcore_list);
   if (rc) {
 - kfree(elfcorebuf);
 + free_pages((unsigned long)elfcorebuf,
 +get_order(elfcorebuf_sz_orig));
   return rc;
   }
   rc = process_ptload_program_headers_elf64(elfcorebuf, elfcorebuf_sz,
   vmcore_list);
   if (rc) {
 - kfree(elfcorebuf);
 + free_pages((unsigned long)elfcorebuf,
 +get_order(elfcorebuf_sz_orig));
   return rc;
   }
   set_vmcore_list_offsets_elf64(elfcorebuf, vmcore_list);
 @@ -665,26 +671,31 @@ static int __init parse_crash_elf32_headers(void)
  
   /* Read in all elf headers. */
   elfcorebuf_sz = ehdr.e_phoff + ehdr.e_phnum * sizeof(Elf32_Phdr);
 - elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
 + elfcorebuf_sz_orig = elfcorebuf_sz;
 + elfcorebuf = (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
 +get_order(elfcorebuf_sz));

Why not elfcorebuf_sz_orig here?

   if (!elfcorebuf)
   return -ENOMEM;
   addr = elfcorehdr_addr;
   rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, addr, 0);
   if (rc  0) {
 - kfree(elfcorebuf);
 + free_pages((unsigned long)elfcorebuf,
 +get_order(elfcorebuf_sz_orig));
   return rc;
   }
  
   /* Merge all PT_NOTE headers into one. */
   rc = merge_note_headers_elf32(elfcorebuf, elfcorebuf_sz, vmcore_list);
   if (rc) {
 - kfree(elfcorebuf);
 + free_pages((unsigned long)elfcorebuf,
 +get_order(elfcorebuf_sz_orig));
   return rc;
   }
   rc = process_ptload_program_headers_elf32(elfcorebuf, elfcorebuf_sz,
   vmcore_list);
   if (rc) {
 - kfree(elfcorebuf);
 + free_pages((unsigned long)elfcorebuf,
 +get_order(elfcorebuf_sz_orig));
   return rc;
   }
   set_vmcore_list_offsets_elf32(elfcorebuf, vmcore_list);
 @@ -766,7 +777,8 @@ void vmcore_cleanup(void)
   list_del(m-list);
   kfree(m);
   }
 - kfree(elfcorebuf);
 + free_pages((unsigned long)elfcorebuf,
 +get_order(elfcorebuf_sz_orig));
   elfcorebuf = NULL;
  }
  EXPORT_SYMBOL_GPL(vmcore_cleanup);
 
 
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 ke...@lists.infradead.org
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[PATCH v2 04/20] vmcore: allocate buffer for ELF headers on page-size alignment

2013-03-04 Thread HATAYAMA Daisuke 
Allocate buffer for ELF headers on page-size aligned boudary to
satisfy mmap() requirement. For this, __get_free_pages() is used
instead of kmalloc().

Also, later patch will decrease actually used buffer size for ELF
headers, so it's necessary to keep original buffer size and actually
used buffer size separately. elfcorebuf_sz_orig keeps the original one
and elfcorebuf_sz the actually used one.

Signed-off-by: HATAYAMA Daisuke 
---

 fs/proc/vmcore.c |   30 +-
 1 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index b5c9e33..1b02d01 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -31,6 +31,7 @@ static LIST_HEAD(vmcore_list);
 /* Stores the pointer to the buffer containing kernel elf core headers. */
 static char *elfcorebuf;
 static size_t elfcorebuf_sz;
+static size_t elfcorebuf_sz_orig;
 
 /* Total size of vmcore file. */
 static u64 vmcore_size;
@@ -610,26 +611,31 @@ static int __init parse_crash_elf64_headers(void)
 
/* Read in all elf headers. */
elfcorebuf_sz = ehdr.e_phoff + ehdr.e_phnum * sizeof(Elf64_Phdr);
-   elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
+   elfcorebuf_sz_orig = elfcorebuf_sz;
+   elfcorebuf = (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
+  get_order(elfcorebuf_sz_orig));
if (!elfcorebuf)
return -ENOMEM;
addr = elfcorehdr_addr;
rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, , 0);
if (rc < 0) {
-   kfree(elfcorebuf);
+   free_pages((unsigned long)elfcorebuf,
+  get_order(elfcorebuf_sz_orig));
return rc;
}
 
/* Merge all PT_NOTE headers into one. */
rc = merge_note_headers_elf64(elfcorebuf, _sz, _list);
if (rc) {
-   kfree(elfcorebuf);
+   free_pages((unsigned long)elfcorebuf,
+  get_order(elfcorebuf_sz_orig));
return rc;
}
rc = process_ptload_program_headers_elf64(elfcorebuf, elfcorebuf_sz,
_list);
if (rc) {
-   kfree(elfcorebuf);
+   free_pages((unsigned long)elfcorebuf,
+  get_order(elfcorebuf_sz_orig));
return rc;
}
set_vmcore_list_offsets_elf64(elfcorebuf, _list);
@@ -665,26 +671,31 @@ static int __init parse_crash_elf32_headers(void)
 
/* Read in all elf headers. */
elfcorebuf_sz = ehdr.e_phoff + ehdr.e_phnum * sizeof(Elf32_Phdr);
-   elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
+   elfcorebuf_sz_orig = elfcorebuf_sz;
+   elfcorebuf = (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
+  get_order(elfcorebuf_sz));
if (!elfcorebuf)
return -ENOMEM;
addr = elfcorehdr_addr;
rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, , 0);
if (rc < 0) {
-   kfree(elfcorebuf);
+   free_pages((unsigned long)elfcorebuf,
+  get_order(elfcorebuf_sz_orig));
return rc;
}
 
/* Merge all PT_NOTE headers into one. */
rc = merge_note_headers_elf32(elfcorebuf, _sz, _list);
if (rc) {
-   kfree(elfcorebuf);
+   free_pages((unsigned long)elfcorebuf,
+  get_order(elfcorebuf_sz_orig));
return rc;
}
rc = process_ptload_program_headers_elf32(elfcorebuf, elfcorebuf_sz,
_list);
if (rc) {
-   kfree(elfcorebuf);
+   free_pages((unsigned long)elfcorebuf,
+  get_order(elfcorebuf_sz_orig));
return rc;
}
set_vmcore_list_offsets_elf32(elfcorebuf, _list);
@@ -766,7 +777,8 @@ void vmcore_cleanup(void)
list_del(>list);
kfree(m);
}
-   kfree(elfcorebuf);
+   free_pages((unsigned long)elfcorebuf,
+  get_order(elfcorebuf_sz_orig));
elfcorebuf = NULL;
 }
 EXPORT_SYMBOL_GPL(vmcore_cleanup);

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[PATCH v2 04/20] vmcore: allocate buffer for ELF headers on page-size alignment

2013-03-04 Thread HATAYAMA Daisuke 
Allocate buffer for ELF headers on page-size aligned boudary to
satisfy mmap() requirement. For this, __get_free_pages() is used
instead of kmalloc().

Also, later patch will decrease actually used buffer size for ELF
headers, so it's necessary to keep original buffer size and actually
used buffer size separately. elfcorebuf_sz_orig keeps the original one
and elfcorebuf_sz the actually used one.

Signed-off-by: HATAYAMA Daisuke d.hatay...@jp.fujitsu.com
---

 fs/proc/vmcore.c |   30 +-
 1 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index b5c9e33..1b02d01 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -31,6 +31,7 @@ static LIST_HEAD(vmcore_list);
 /* Stores the pointer to the buffer containing kernel elf core headers. */
 static char *elfcorebuf;
 static size_t elfcorebuf_sz;
+static size_t elfcorebuf_sz_orig;
 
 /* Total size of vmcore file. */
 static u64 vmcore_size;
@@ -610,26 +611,31 @@ static int __init parse_crash_elf64_headers(void)
 
/* Read in all elf headers. */
elfcorebuf_sz = ehdr.e_phoff + ehdr.e_phnum * sizeof(Elf64_Phdr);
-   elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
+   elfcorebuf_sz_orig = elfcorebuf_sz;
+   elfcorebuf = (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
+  get_order(elfcorebuf_sz_orig));
if (!elfcorebuf)
return -ENOMEM;
addr = elfcorehdr_addr;
rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, addr, 0);
if (rc  0) {
-   kfree(elfcorebuf);
+   free_pages((unsigned long)elfcorebuf,
+  get_order(elfcorebuf_sz_orig));
return rc;
}
 
/* Merge all PT_NOTE headers into one. */
rc = merge_note_headers_elf64(elfcorebuf, elfcorebuf_sz, vmcore_list);
if (rc) {
-   kfree(elfcorebuf);
+   free_pages((unsigned long)elfcorebuf,
+  get_order(elfcorebuf_sz_orig));
return rc;
}
rc = process_ptload_program_headers_elf64(elfcorebuf, elfcorebuf_sz,
vmcore_list);
if (rc) {
-   kfree(elfcorebuf);
+   free_pages((unsigned long)elfcorebuf,
+  get_order(elfcorebuf_sz_orig));
return rc;
}
set_vmcore_list_offsets_elf64(elfcorebuf, vmcore_list);
@@ -665,26 +671,31 @@ static int __init parse_crash_elf32_headers(void)
 
/* Read in all elf headers. */
elfcorebuf_sz = ehdr.e_phoff + ehdr.e_phnum * sizeof(Elf32_Phdr);
-   elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
+   elfcorebuf_sz_orig = elfcorebuf_sz;
+   elfcorebuf = (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
+  get_order(elfcorebuf_sz));
if (!elfcorebuf)
return -ENOMEM;
addr = elfcorehdr_addr;
rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, addr, 0);
if (rc  0) {
-   kfree(elfcorebuf);
+   free_pages((unsigned long)elfcorebuf,
+  get_order(elfcorebuf_sz_orig));
return rc;
}
 
/* Merge all PT_NOTE headers into one. */
rc = merge_note_headers_elf32(elfcorebuf, elfcorebuf_sz, vmcore_list);
if (rc) {
-   kfree(elfcorebuf);
+   free_pages((unsigned long)elfcorebuf,
+  get_order(elfcorebuf_sz_orig));
return rc;
}
rc = process_ptload_program_headers_elf32(elfcorebuf, elfcorebuf_sz,
vmcore_list);
if (rc) {
-   kfree(elfcorebuf);
+   free_pages((unsigned long)elfcorebuf,
+  get_order(elfcorebuf_sz_orig));
return rc;
}
set_vmcore_list_offsets_elf32(elfcorebuf, vmcore_list);
@@ -766,7 +777,8 @@ void vmcore_cleanup(void)
list_del(m-list);
kfree(m);
}
-   kfree(elfcorebuf);
+   free_pages((unsigned long)elfcorebuf,
+  get_order(elfcorebuf_sz_orig));
elfcorebuf = NULL;
 }
 EXPORT_SYMBOL_GPL(vmcore_cleanup);

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