linux-kernel - [PATCH v4, part3 06/41] tile: normalize global variables exported by vmlinux.lds

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Date:	Sat,  6 Apr 2013 22:32:05 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jiang Liu <jiang.liu@...wei.com>,
	David Rientjes <rientjes@...gle.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	David Howells <dhowells@...hat.com>,
	Mark Salter <msalter@...hat.com>,
	Jianguo Wu <wujianguo@...wei.com>, linux-mm@...ck.org,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	Chris Metcalf <cmetcalf@...era.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH v4, part3 06/41] tile: normalize global variables exported by vmlinux.lds

Normalize global variables exported by vmlinux.lds to conform usage
guidelines from include/asm-generic/sections.h.

1) Use _text to mark the start of the kernel image including the head
text, and _stext to mark the start of the .text section.
2) Export mandatory global variables __init_begin and __init_end.

Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
Cc: Chris Metcalf <cmetcalf@...era.com>
Cc: Rusty Russell <rusty@...tcorp.com.au>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Wen Congyang <wency@...fujitsu.com>
Cc: David Howells <dhowells@...hat.com>
Cc: linux-kernel@...r.kernel.org
---
 arch/tile/include/asm/sections.h |    2 +-
 arch/tile/kernel/setup.c         |    4 ++--
 arch/tile/kernel/vmlinux.lds.S   |    4 +++-
 arch/tile/mm/init.c              |    2 +-
 4 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/arch/tile/include/asm/sections.h b/arch/tile/include/asm/sections.h
index d062d46..7d8a935 100644
--- a/arch/tile/include/asm/sections.h
+++ b/arch/tile/include/asm/sections.h
@@ -34,7 +34,7 @@ extern char __sys_cmpxchg_grab_lock[];
 extern char __start_atomic_asm_code[], __end_atomic_asm_code[];
 #endif
 
-/* Handle the discontiguity between _sdata and _stext. */
+/* Handle the discontiguity between _sdata and _text. */
 static inline int arch_is_kernel_data(unsigned long addr)
 {
 	return addr >= (unsigned long)_sdata &&
diff --git a/arch/tile/kernel/setup.c b/arch/tile/kernel/setup.c
index d1e15f7..a986b71 100644
--- a/arch/tile/kernel/setup.c
+++ b/arch/tile/kernel/setup.c
@@ -307,8 +307,8 @@ static void __cpuinit store_permanent_mappings(void)
 		hv_store_mapping(addr, pages << PAGE_SHIFT, pa);
 	}
 
-	hv_store_mapping((HV_VirtAddr)_stext,
-			 (uint32_t)(_einittext - _stext), 0);
+	hv_store_mapping((HV_VirtAddr)_text,
+			 (uint32_t)(_einittext - _text), 0);
 }
 
 /*
diff --git a/arch/tile/kernel/vmlinux.lds.S b/arch/tile/kernel/vmlinux.lds.S
index 631f10d..a13ed90 100644
--- a/arch/tile/kernel/vmlinux.lds.S
+++ b/arch/tile/kernel/vmlinux.lds.S
@@ -27,7 +27,6 @@ SECTIONS
   .intrpt1 (LOAD_OFFSET) : AT ( 0 )   /* put at the start of physical memory */
   {
     _text = .;
-    _stext = .;
     *(.intrpt1)
   } :intrpt1 =0
 
@@ -36,6 +35,7 @@ SECTIONS
 
   /* Now the real code */
   . = ALIGN(0x20000);
+  _stext = .;
   .text : AT (ADDR(.text) - LOAD_OFFSET) {
     HEAD_TEXT
     SCHED_TEXT
@@ -58,11 +58,13 @@ SECTIONS
   #define LOAD_OFFSET PAGE_OFFSET
 
   . = ALIGN(PAGE_SIZE);
+  __init_begin = .;
   VMLINUX_SYMBOL(_sinitdata) = .;
   INIT_DATA_SECTION(16) :data =0
   PERCPU_SECTION(L2_CACHE_BYTES)
   . = ALIGN(PAGE_SIZE);
   VMLINUX_SYMBOL(_einitdata) = .;
+  __init_end = .;
 
   _sdata = .;                   /* Start of data section */
 
diff --git a/arch/tile/mm/init.c b/arch/tile/mm/init.c
index 45ce26d..f2ac2f4 100644
--- a/arch/tile/mm/init.c
+++ b/arch/tile/mm/init.c
@@ -562,7 +562,7 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base)
 			prot = ktext_set_nocache(prot);
 		}
 
-		BUG_ON(address != (unsigned long)_stext);
+		BUG_ON(address != (unsigned long)_text);
 		pte = NULL;
 		for (; address < (unsigned long)_einittext;
 		     pfn++, address += PAGE_SIZE) {
-- 
1.7.9.5

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