x86, vmlinux.lds: unify first part of initdata

32-bit:

 - Move definition of __init_begin outside output_section
   because it covers more than one section
 - Move ALIGN() for end-of-section inside .smp_locks output section.
   Same effect but the intent is better documented that
   we need both start and end aligned.

64-bit:

 - Move ALIGN() outside output section in .init.setup
 - Deleted unused __smp_alt_* symbols

None of the above should result in any functional change.

[ Impact: refactor and unify linker script ]

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Tim Abbott <tabbott@MIT.EDU>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <1240991249-27117-9-git-send-email-sam@ravnborg.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index b3106c2..8b203c4 100644 (file)
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -231,6 +231,67 @@ SECTIONS
 
 #endif /* CONFIG_X86_64 */
 
+       /* init_task */
+       . = ALIGN(THREAD_SIZE);
+       .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
+               *(.data.init_task)
+       }
+#ifdef CONFIG_X86_64
+        :data.init
+#endif
+
+       /*
+        * smp_locks might be freed after init
+        * start/end must be page aligned
+        */
+       . = ALIGN(PAGE_SIZE);
+       .smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
+               __smp_locks = .;
+               *(.smp_locks)
+               __smp_locks_end = .;
+               . = ALIGN(PAGE_SIZE);
+       }
+
+       /* Init code and data - will be freed after init */
+       . = ALIGN(PAGE_SIZE);
+       __init_begin = .; /* paired with __init_end */
+       .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
+               _sinittext = .;
+               INIT_TEXT
+               _einittext = .;
+       }
+
+       .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
+               INIT_DATA
+       }
+
+       . = ALIGN(16);
+       .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
+               __setup_start = .;
+               *(.init.setup)
+               __setup_end = .;
+       }
+       .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
+               __initcall_start = .;
+               INITCALLS
+               __initcall_end = .;
+       }
+
+       .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
+               __con_initcall_start = .;
+               *(.con_initcall.init)
+               __con_initcall_end = .;
+       }
+
+       .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
+
+
 #ifdef CONFIG_X86_32
 # include "vmlinux_32.lds.S"
 #else

diff --git a/arch/x86/kernel/vmlinux_32.lds.S b/arch/x86/kernel/vmlinux_32.lds.S
index 8ade846..d8ba539 100644 (file)
--- a/arch/x86/kernel/vmlinux_32.lds.S
+++ b/arch/x86/kernel/vmlinux_32.lds.S
@@ -1,63 +1,3 @@
-       /* init_task */
-       . = ALIGN(THREAD_SIZE);
-       .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
-               *(.data.init_task)
-       }
-
-       . = ALIGN(PAGE_SIZE);
-       .smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
-               /* might get freed after init */
-               __smp_locks = .;
-               *(.smp_locks)
-               __smp_locks_end = .;
-       }
-       /* will be freed after init
-        * Following ALIGN() is required to make sure no other data falls on the
-        * same page where __smp_alt_end is pointing as that page might be freed
-        * after boot. Always make sure that ALIGN() directive is present after
-        * the section which contains __smp_alt_end.
-        */
-       . = ALIGN(PAGE_SIZE);
-
-       /* Init code and data - will be freed after init */
-       . = ALIGN(PAGE_SIZE);
-       .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
-               __init_begin = .;
-               _sinittext = .;
-               INIT_TEXT
-               _einittext = .;
-       }
-
-       .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
-               INIT_DATA
-       }
-
-       . = ALIGN(16);
-       .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
-               __setup_start = .;
-               *(.init.setup)
-               __setup_end = .;
-       }
-       .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
-               __initcall_start = .;
-               INITCALLS
-               __initcall_end = .;
-       }
-
-       .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
-               __con_initcall_start = .;
-               *(.con_initcall.init)
-               __con_initcall_end = .;
-       }
-
-       .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(4);
        .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
                __alt_instructions = .;

diff --git a/arch/x86/kernel/vmlinux_64.lds.S b/arch/x86/kernel/vmlinux_64.lds.S
index 013aa0e..0e8054e 100644 (file)
--- a/arch/x86/kernel/vmlinux_64.lds.S
+++ b/arch/x86/kernel/vmlinux_64.lds.S
@@ -1,62 +1,3 @@
-       /* init_task */
-       .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
-               . = ALIGN(THREAD_SIZE);
-               *(.data.init_task)
-       } :data.init
-
-       .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 = .;
-       }
-
-       /* Init code and data */
-       . = ALIGN(PAGE_SIZE);
-       __init_begin = .;       /* paired with __init_end */
-       .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
-               _sinittext = .;
-               INIT_TEXT
-               _einittext = .;
-       }
-
-       .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
-               __initdata_begin = .;
-               INIT_DATA
-               __initdata_end = .;
-       }
-
-       .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 = .;
-       }
-
-       .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
-               __con_initcall_start = .;
-               *(.con_initcall.init)
-               __con_initcall_end = .;
-       }
-
-       .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);
        .parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
                __parainstructions = .;