[RFC PATCH v2, part4 01/39] vmlinux.lds: add comments for global variables and clean up useless declarations

[RFC PATCH v2, part4 01/39] vmlinux.lds: add comments for global variables and clean up useless declarations

[Jiang Liu]

This patch documents global variables exported from vmlinux.lds.
1) Add comments about usage guidelines for global variables exported
   from vmlinux.lds.S.
2) Remove unused __initdata_begin[] and __initdata_end[].

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arch@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
 include/asm-generic/sections.h |   21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
index c1a1216..f1a24b5 100644
--- a/include/asm-generic/sections.h
+++ b/include/asm-generic/sections.h
@@ -3,6 +3,26 @@
 
 /* References to section boundaries */
 
+/*
+ * Usage guidelines:
+ * _text, _data: architecture specific, don't use them in arch-independent code
+ * [_stext, _etext]: contains .text.* sections, may also contain .rodata.*
+ *                   and/or .init.* sections
+ * [_sdata, _edata]: contains .data.* sections, may also contain .rodata.*
+ *                   and/or .init.* sections.
+ * [__start_rodata, __end_rodata]: contains .rodata.* sections
+ * [__init_begin, __init_end]: contains .init.* sections, but .init.text.*
+ *                   may be out of this range on some architectures.
+ * [_sinittext, _einittext]: contains .init.text.* sections
+ * [__bss_start, __bss_stop]: contains BSS sections
+ *
+ * Following global variables are optional and may be unavailable on some
+ * architectures and/or kernel configurations.
+ *	_text, _data
+ *	__kprobes_text_start, __kprobes_text_end
+ *	__entry_text_start, __entry_text_end
+ *	__ctors_start, __ctors_end
+ */
 extern char _text[], _stext[], _etext[];
 extern char _data[], _sdata[], _edata[];
 extern char __bss_start[], __bss_stop[];
@@ -12,7 +32,6 @@ extern char _end[];
 extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[];
 extern char __kprobes_text_start[], __kprobes_text_end[];
 extern char __entry_text_start[], __entry_text_end[];
-extern char __initdata_begin[], __initdata_end[];
 extern char __start_rodata[], __end_rodata[];
 
 /* Start and end of .ctors section - used for constructor calls. */
-- 
1.7.9.5

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[RFC PATCH v2, part4 01/39] vmlinux.lds: add comments for global variables and clean up useless declarations

[Jiang Liu]

This patch documents global variables exported from vmlinux.lds.
1) Add comments about usage guidelines for global variables exported
   from vmlinux.lds.S.
2) Remove unused __initdata_begin[] and __initdata_end[].

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arch@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
 include/asm-generic/sections.h |   21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
index c1a1216..f1a24b5 100644
--- a/include/asm-generic/sections.h
+++ b/include/asm-generic/sections.h
@@ -3,6 +3,26 @@
 
 /* References to section boundaries */
 
+/*
+ * Usage guidelines:
+ * _text, _data: architecture specific, don't use them in arch-independent code
+ * [_stext, _etext]: contains .text.* sections, may also contain .rodata.*
+ *                   and/or .init.* sections
+ * [_sdata, _edata]: contains .data.* sections, may also contain .rodata.*
+ *                   and/or .init.* sections.
+ * [__start_rodata, __end_rodata]: contains .rodata.* sections
+ * [__init_begin, __init_end]: contains .init.* sections, but .init.text.*
+ *                   may be out of this range on some architectures.
+ * [_sinittext, _einittext]: contains .init.text.* sections
+ * [__bss_start, __bss_stop]: contains BSS sections
+ *
+ * Following global variables are optional and may be unavailable on some
+ * architectures and/or kernel configurations.
+ *	_text, _data
+ *	__kprobes_text_start, __kprobes_text_end
+ *	__entry_text_start, __entry_text_end
+ *	__ctors_start, __ctors_end
+ */
 extern char _text[], _stext[], _etext[];
 extern char _data[], _sdata[], _edata[];
 extern char __bss_start[], __bss_stop[];
@@ -12,7 +32,6 @@ extern char _end[];
 extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[];
 extern char __kprobes_text_start[], __kprobes_text_end[];
 extern char __entry_text_start[], __entry_text_end[];
-extern char __initdata_begin[], __initdata_end[];
 extern char __start_rodata[], __end_rodata[];
 
 /* Start and end of .ctors section - used for constructor calls. */
-- 
1.7.9.5

Re: [RFC PATCH v2, part4 01/39] vmlinux.lds: add comments for global variables and clean up useless declarations

[Arnd Bergmann]

On Sunday 24 March 2013, Jiang Liu wrote:
> This patch documents global variables exported from vmlinux.lds.
> 1) Add comments about usage guidelines for global variables exported
>    from vmlinux.lds.S.
> 2) Remove unused __initdata_begin[] and __initdata_end[].
> 
> Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: linux-arch@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> ---
>  include/asm-generic/sections.h |   21 ++++++++++++++++++++-
>  1 file changed, 20 insertions(+), 1 deletion(-)

for asm-generic:

Acked-by: Arnd Bergmann <arnd@arndb.de>

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Re: [RFC PATCH v2, part4 01/39] vmlinux.lds: add comments for global variables and clean up useless declarations

[Arnd Bergmann]

On Sunday 24 March 2013, Jiang Liu wrote:
> This patch documents global variables exported from vmlinux.lds.
> 1) Add comments about usage guidelines for global variables exported
>    from vmlinux.lds.S.
> 2) Remove unused __initdata_begin[] and __initdata_end[].
> 
> Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: linux-arch@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> ---
>  include/asm-generic/sections.h |   21 ++++++++++++++++++++-
>  1 file changed, 20 insertions(+), 1 deletion(-)

for asm-generic:

Acked-by: Arnd Bergmann <arnd@arndb.de>

Re: [RFC PATCH v2, part4 00/39] Simplify mem_init() implementations and kill num_physpages

[Vineet Gupta]

On 03/25/2013 09:49 PM, Jiang Liu wrote:
> Hi James,
> 	Thanks for reminder, my patch series have been screwed up.
> I will send another version and build a git tree on github.
> 	Thanks!
> 	Gerry

Please don't forget conversion of the newly added arc and metag arches !

Thx,
-Vineet

> On 03/24/2013 04:11 PM, James Bottomley wrote:
>> On Sun, 2013-03-24 at 15:24 +0800, Jiang Liu wrote:
>>> The original goal of this patchset is to fix the bug reported by
>>> https://bugzilla.kernel.org/show_bug.cgi?id=53501
>>> Now it has also been expanded to reduce common code used by memory
>>> initializion.
>>>
>>> This is the last part, previous three patch sets could be accessed at:
>>> http://marc.info/?l=linux-mm&m=136289696323825&w=2
>>> http://marc.info/?l=linux-mm&m=136290291524901&w=2
>>> http://marc.info/?l=linux-mm&m=136345342831592&w=2
>>>
>>> This patchset applies to
>>> https://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git since-3.8
>>
>> You're going to have to have a git tree for this if you want this series
>> testing on other architectures.  Plus cc'ing linux-arch would be a good
>> idea for that case.  The patch series seems to be screwed up in the
>> numbering:  The parisc patches 26/39 and 27/39 are identical.
>>
>> James
>>
>>
>>
>>
>>
> 
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