x86: make section delimiter symbols part of their section

Impact: cleanup

Move the symbols delimiting a section part of the section
(section relative) rather than absolute.  This avoids any
unexpected gaps between the section-start symbol and the first
data in the section, which could be caused by implicit
alignment of the section data.  It also makes the general
form of vmlinux_64.lds.S consistent with vmlinux_32.lds.S.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/arch/x86/kernel/vmlinux_64.lds.S b/arch/x86/kernel/vmlinux_64.lds.S
index 5bf54e4..fe5d21c 100644 (file)
--- a/arch/x86/kernel/vmlinux_64.lds.S
+++ b/arch/x86/kernel/vmlinux_64.lds.S
@@ -29,8 +29,8 @@ SECTIONS
 {
   . = __START_KERNEL;
   phys_startup_64 = startup_64 - LOAD_OFFSET;
-  _text = .;                   /* Text and read-only data */
   .text :  AT(ADDR(.text) - LOAD_OFFSET) {
+       _text = .;                      /* Text and read-only data */
        /* First the code that has to be first for bootstrapping */
        *(.text.head)
        _stext = .;
@@ -61,13 +61,13 @@ SECTIONS
   .data : AT(ADDR(.data) - LOAD_OFFSET) {
        DATA_DATA
        CONSTRUCTORS
+       _edata = .;                     /* End of data section */
        } :data
 
-  _edata = .;                  /* End of data section */
 
-  . = ALIGN(PAGE_SIZE);
-  . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
   .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
+       . = ALIGN(PAGE_SIZE);
+       . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
        *(.data.cacheline_aligned)
   }
   . = ALIGN(CONFIG_X86_INTERNODE_CACHE_BYTES);
@@ -125,29 +125,29 @@ SECTIONS
 #undef VVIRT_OFFSET
 #undef VVIRT
 
-  . = ALIGN(THREAD_SIZE);      /* init_task */
   .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
+       . = ALIGN(THREAD_SIZE); /* init_task */
        *(.data.init_task)
   }:data.init
 
-  . = ALIGN(PAGE_SIZE);
   .data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
+       . = ALIGN(PAGE_SIZE);
        *(.data.page_aligned)
   }
 
-  /* might get freed after init */
-  . = ALIGN(PAGE_SIZE);
-  __smp_alt_begin = .;
-  __smp_locks = .;
   .smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
+       /* might get freed after init */
+       . = ALIGN(PAGE_SIZE);
+       __smp_alt_begin = .;
+       __smp_locks = .;
        *(.smp_locks)
+       __smp_locks_end = .;
+       . = ALIGN(PAGE_SIZE);
+       __smp_alt_end = .;
   }
-  __smp_locks_end = .;
-  . = ALIGN(PAGE_SIZE);
-  __smp_alt_end = .;
 
   . = ALIGN(PAGE_SIZE);                /* Init code and data */
-  __init_begin = .;
+  __init_begin = .;    /* paired with __init_end */
   .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
        _sinittext = .;
        INIT_TEXT
@@ -159,40 +159,42 @@ SECTIONS
        __initdata_end = .;
    }
 
-  . = ALIGN(16);
-  __setup_start = .;
-  .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) { *(.init.setup) }
-  __setup_end = .;
-  __initcall_start = .;
+  .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
+       . = ALIGN(16);
+       __setup_start = .;
+       *(.init.setup)
+       __setup_end = .;
+  }
   .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
+       __initcall_start = .;
        INITCALLS
+       __initcall_end = .;
   }
-  __initcall_end = .;
-  __con_initcall_start = .;
   .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
+       __con_initcall_start = .;
        *(.con_initcall.init)
+       __con_initcall_end = .;
   }
-  __con_initcall_end = .;
-  __x86_cpu_dev_start = .;
   .x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
+       __x86_cpu_dev_start = .;
        *(.x86_cpu_dev.init)
+       __x86_cpu_dev_end = .;
   }
-  __x86_cpu_dev_end = .;
   SECURITY_INIT
 
   . = ALIGN(8);
   .parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
-  __parainstructions = .;
+       __parainstructions = .;
        *(.parainstructions)
-  __parainstructions_end = .;
+       __parainstructions_end = .;
   }
 
-  . = ALIGN(8);
-  __alt_instructions = .;
   .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
+       . = ALIGN(8);
+       __alt_instructions = .;
        *(.altinstructions)
+       __alt_instructions_end = .;
   }
-  __alt_instructions_end = .;
   .altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
        *(.altinstr_replacement)
   }
@@ -207,9 +209,11 @@ SECTIONS
 
 #ifdef CONFIG_BLK_DEV_INITRD
   . = ALIGN(PAGE_SIZE);
-  __initramfs_start = .;
-  .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) { *(.init.ramfs) }
-  __initramfs_end = .;
+  .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
+       __initramfs_start = .;
+       *(.init.ramfs)
+       __initramfs_end = .;
+  }
 #endif
 
 #ifdef CONFIG_SMP
@@ -229,20 +233,21 @@ SECTIONS
   . = ALIGN(PAGE_SIZE);
   __init_end = .;
 
-  . = ALIGN(PAGE_SIZE);
-  __nosave_begin = .;
   .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
-      *(.data.nosave)
+       . = ALIGN(PAGE_SIZE);
+       __nosave_begin = .;
+       *(.data.nosave)
+       . = ALIGN(PAGE_SIZE);
+       __nosave_end = .;
   } :data.init2 /* use another section data.init2, see PERCPU_VADDR() above */
-  . = ALIGN(PAGE_SIZE);
-  __nosave_end = .;
 
-  __bss_start = .;             /* BSS */
   .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
+       . = ALIGN(PAGE_SIZE);
+       __bss_start = .;                /* BSS */
        *(.bss.page_aligned)
        *(.bss)
-       }
-  __bss_stop = .;
+       __bss_stop = .;
+  }
 
   _end = . ;