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Commit b9719a4d authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by H. Peter Anvin
Browse files

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: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
parent c550033c

arch/x86/kernel/vmlinux_64.lds.S

+45 −40
Original line number Diff line number Diff line
@@ -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 */



  .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {

	. = ALIGN(PAGE_SIZE);

	. = ALIGN(CONFIG_X86_L1_CACHE_BYTES);

  .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {

	*(.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)

  }



  .smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {

	/* might get freed after init */

	. = ALIGN(PAGE_SIZE);

	__smp_alt_begin = .;

	__smp_locks = .;

  .smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {

	*(.smp_locks)

  }

	__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
@@ -159,25 +159,27 @@ SECTIONS 
	__initdata_end = .;

   }



  .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {

	. = ALIGN(16);

	__setup_start = .;

  .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) { *(.init.setup) }

	*(.init.setup)

	__setup_end = .;

  __initcall_start = .;

  }

  .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {

	__initcall_start = .;

	INITCALLS

  }

	__initcall_end = .;

  __con_initcall_start = .;

  }

  .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {

	__con_initcall_start = .;

	*(.con_initcall.init)

  }

	__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 = .;

  }

  SECURITY_INIT



  . = ALIGN(8);
@@ -187,12 +189,12 @@ SECTIONS 
	__parainstructions_end = .;

  }



  .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {

	. = ALIGN(8);

	__alt_instructions = .;

  .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {

	*(.altinstructions)

  }

	__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);

  .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {

	__initramfs_start = .;

  .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) { *(.init.ramfs) }

	*(.init.ramfs)

	__initramfs_end = .;

  }

#endif



#ifdef CONFIG_SMP
@@ -229,20 +233,21 @@ SECTIONS 
  . = ALIGN(PAGE_SIZE);

  __init_end = .;



  .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {

	. = ALIGN(PAGE_SIZE);

	__nosave_begin = .;

  .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {

	*(.data.nosave)

  } :data.init2 /* use another section data.init2, see PERCPU_VADDR() above */

	. = ALIGN(PAGE_SIZE);

	__nosave_end = .;

  } :data.init2 /* use another section data.init2, see PERCPU_VADDR() above */



  __bss_start = .;		/* BSS */

  .bss : AT(ADDR(.bss) - LOAD_OFFSET) {

	. = ALIGN(PAGE_SIZE);

	__bss_start = .;		/* BSS */

	*(.bss.page_aligned)

	*(.bss)

	}

	__bss_stop = .;

  }



  _end = . ;