include/asm-generic/vmlinux.lds.h

   1 #ifndef LOAD_OFFSET
   2 #define LOAD_OFFSET 0
   3 #endif
   4
   5 #ifndef VMLINUX_SYMBOL
   6 #define VMLINUX_SYMBOL(_sym_) _sym_
   7 #endif
   8
   9 /* Align . to a 8 byte boundary equals to maximum function alignment. */
  10 #define ALIGN_FUNCTION()  . = ALIGN(8)
  11
  12 /* The actual configuration determine if the init/exit sections
  13  * are handled as text/data or they can be discarded (which
  14  * often happens at runtime)
  15  */
  16 #ifdef CONFIG_HOTPLUG
  17 #define DEV_KEEP(sec)    *(.dev##sec)
  18 #define DEV_DISCARD(sec)
  19 #else
  20 #define DEV_KEEP(sec)
  21 #define DEV_DISCARD(sec) *(.dev##sec)
  22 #endif
  23
  24 #ifdef CONFIG_HOTPLUG_CPU
  25 #define CPU_KEEP(sec)    *(.cpu##sec)
  26 #define CPU_DISCARD(sec)
  27 #else
  28 #define CPU_KEEP(sec)
  29 #define CPU_DISCARD(sec) *(.cpu##sec)
  30 #endif
  31
  32 #if defined(CONFIG_MEMORY_HOTPLUG)
  33 #define MEM_KEEP(sec)    *(.mem##sec)
  34 #define MEM_DISCARD(sec)
  35 #else
  36 #define MEM_KEEP(sec)
  37 #define MEM_DISCARD(sec) *(.mem##sec)
  38 #endif
  39
  40 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
  41 #define MCOUNT_REC()    VMLINUX_SYMBOL(__start_mcount_loc) = .; \
  42                         *(__mcount_loc)                         \
  43                         VMLINUX_SYMBOL(__stop_mcount_loc) = .;
  44 #else
  45 #define MCOUNT_REC()
  46 #endif
  47
  48 #ifdef CONFIG_TRACE_BRANCH_PROFILING
  49 #define LIKELY_PROFILE()        VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
  50                                 *(_ftrace_annotated_branch)                           \
  51                                 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
  52 #else
  53 #define LIKELY_PROFILE()
  54 #endif
  55
  56 #ifdef CONFIG_PROFILE_ALL_BRANCHES
  57 #define BRANCH_PROFILE()        VMLINUX_SYMBOL(__start_branch_profile) = .;   \
  58                                 *(_ftrace_branch)                             \
  59                                 VMLINUX_SYMBOL(__stop_branch_profile) = .;
  60 #else
  61 #define BRANCH_PROFILE()
  62 #endif
  63
  64 /* .data section */
  65 #define DATA_DATA                                                       \
  66         *(.data)                                                        \
  67         *(.data.init.refok)                                             \
  68         *(.ref.data)                                                    \
  69         DEV_KEEP(init.data)                                             \
  70         DEV_KEEP(exit.data)                                             \
  71         CPU_KEEP(init.data)                                             \
  72         CPU_KEEP(exit.data)                                             \
  73         MEM_KEEP(init.data)                                             \
  74         MEM_KEEP(exit.data)                                             \
  75         . = ALIGN(8);                                                   \
  76         VMLINUX_SYMBOL(__start___markers) = .;                          \
  77         *(__markers)                                                    \
  78         VMLINUX_SYMBOL(__stop___markers) = .;                           \
  79         . = ALIGN(32);                                                  \
  80         VMLINUX_SYMBOL(__start___tracepoints) = .;                      \
  81         *(__tracepoints)                                                \
  82         VMLINUX_SYMBOL(__stop___tracepoints) = .;                       \
  83         LIKELY_PROFILE()                                                \
  84         BRANCH_PROFILE()
  85
  86 #define RO_DATA(align)                                                  \
  87         . = ALIGN((align));                                             \
  88         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
  89                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
  90                 *(.rodata) *(.rodata.*)                                 \
  91                 *(__vermagic)           /* Kernel version magic */      \
  92                 *(__markers_strings)    /* Markers: strings */          \
  93                 *(__tracepoints_strings)/* Tracepoints: strings */      \
  94         }                                                               \
  95                                                                         \
  96         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
  97                 *(.rodata1)                                             \
  98         }                                                               \
  99                                                                         \
 100         BUG_TABLE                                                       \
 101                                                                         \
 102         /* PCI quirks */                                                \
 103         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 104                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 105                 *(.pci_fixup_early)                                     \
 106                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 107                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 108                 *(.pci_fixup_header)                                    \
 109                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 110                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 111                 *(.pci_fixup_final)                                     \
 112                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 113                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 114                 *(.pci_fixup_enable)                                    \
 115                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 116                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 117                 *(.pci_fixup_resume)                                    \
 118                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 119                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 120                 *(.pci_fixup_resume_early)                              \
 121                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 122                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 123                 *(.pci_fixup_suspend)                                   \
 124                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 125         }                                                               \
 126                                                                         \
 127         /* Built-in firmware blobs */                                   \
 128         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 129                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 130                 *(.builtin_fw)                                          \
 131                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 132         }                                                               \
 133                                                                         \
 134         /* RapidIO route ops */                                         \
 135         .rio_route        : AT(ADDR(.rio_route) - LOAD_OFFSET) {        \
 136                 VMLINUX_SYMBOL(__start_rio_route_ops) = .;              \
 137                 *(.rio_route_ops)                                       \
 138                 VMLINUX_SYMBOL(__end_rio_route_ops) = .;                \
 139         }                                                               \
 140                                                                         \
 141         TRACEDATA                                                       \
 142                                                                         \
 143         /* Kernel symbol table: Normal symbols */                       \
 144         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 145                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 146                 *(__ksymtab)                                            \
 147                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 148         }                                                               \
 149                                                                         \
 150         /* Kernel symbol table: GPL-only symbols */                     \
 151         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 152                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 153                 *(__ksymtab_gpl)                                        \
 154                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 155         }                                                               \
 156                                                                         \
 157         /* Kernel symbol table: Normal unused symbols */                \
 158         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 159                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 160                 *(__ksymtab_unused)                                     \
 161                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 162         }                                                               \
 163                                                                         \
 164         /* Kernel symbol table: GPL-only unused symbols */              \
 165         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 166                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 167                 *(__ksymtab_unused_gpl)                                 \
 168                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 169         }                                                               \
 170                                                                         \
 171         /* Kernel symbol table: GPL-future-only symbols */              \
 172         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 173                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 174                 *(__ksymtab_gpl_future)                                 \
 175                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 176         }                                                               \
 177                                                                         \
 178         /* Kernel symbol table: Normal symbols */                       \
 179         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 180                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 181                 *(__kcrctab)                                            \
 182                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 183         }                                                               \
 184                                                                         \
 185         /* Kernel symbol table: GPL-only symbols */                     \
 186         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 187                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 188                 *(__kcrctab_gpl)                                        \
 189                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 190         }                                                               \
 191                                                                         \
 192         /* Kernel symbol table: Normal unused symbols */                \
 193         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 194                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 195                 *(__kcrctab_unused)                                     \
 196                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 197         }                                                               \
 198                                                                         \
 199         /* Kernel symbol table: GPL-only unused symbols */              \
 200         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 201                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 202                 *(__kcrctab_unused_gpl)                                 \
 203                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 204         }                                                               \
 205                                                                         \
 206         /* Kernel symbol table: GPL-future-only symbols */              \
 207         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 208                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 209                 *(__kcrctab_gpl_future)                                 \
 210                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 211         }                                                               \
 212                                                                         \
 213         /* Kernel symbol table: strings */                              \
 214         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 215                 *(__ksymtab_strings)                                    \
 216         }                                                               \
 217                                                                         \
 218         /* __*init sections */                                          \
 219         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 220                 *(.ref.rodata)                                          \
 221                 MCOUNT_REC()                                            \
 222                 DEV_KEEP(init.rodata)                                   \
 223                 DEV_KEEP(exit.rodata)                                   \
 224                 CPU_KEEP(init.rodata)                                   \
 225                 CPU_KEEP(exit.rodata)                                   \
 226                 MEM_KEEP(init.rodata)                                   \
 227                 MEM_KEEP(exit.rodata)                                   \
 228         }                                                               \
 229                                                                         \
 230         /* Built-in module parameters. */                               \
 231         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 232                 VMLINUX_SYMBOL(__start___param) = .;                    \
 233                 *(__param)                                              \
 234                 VMLINUX_SYMBOL(__stop___param) = .;                     \
 235                 . = ALIGN((align));                                     \
 236                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 237         }                                                               \
 238         . = ALIGN((align));
 239
 240 /* RODATA provided for backward compatibility.
 241  * All archs are supposed to use RO_DATA() */
 242 #define RODATA RO_DATA(4096)
 243
 244 #define SECURITY_INIT                                                   \
 245         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 246                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 247                 *(.security_initcall.init)                              \
 248                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 249         }
 250
 251 /* .text section. Map to function alignment to avoid address changes
 252  * during second ld run in second ld pass when generating System.map */
 253 #define TEXT_TEXT                                                       \
 254                 ALIGN_FUNCTION();                                       \
 255                 *(.text.hot)                                            \
 256                 *(.text)                                                \
 257                 *(.ref.text)                                            \
 258                 *(.text.init.refok)                                     \
 259                 *(.exit.text.refok)                                     \
 260         DEV_KEEP(init.text)                                             \
 261         DEV_KEEP(exit.text)                                             \
 262         CPU_KEEP(init.text)                                             \
 263         CPU_KEEP(exit.text)                                             \
 264         MEM_KEEP(init.text)                                             \
 265         MEM_KEEP(exit.text)                                             \
 266                 *(.text.unlikely)
 267
 268
 269 /* sched.text is aling to function alignment to secure we have same
 270  * address even at second ld pass when generating System.map */
 271 #define SCHED_TEXT                                                      \
 272                 ALIGN_FUNCTION();                                       \
 273                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 274                 *(.sched.text)                                          \
 275                 VMLINUX_SYMBOL(__sched_text_end) = .;
 276
 277 /* spinlock.text is aling to function alignment to secure we have same
 278  * address even at second ld pass when generating System.map */
 279 #define LOCK_TEXT                                                       \
 280                 ALIGN_FUNCTION();                                       \
 281                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 282                 *(.spinlock.text)                                       \
 283                 VMLINUX_SYMBOL(__lock_text_end) = .;
 284
 285 #define KPROBES_TEXT                                                    \
 286                 ALIGN_FUNCTION();                                       \
 287                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 288                 *(.kprobes.text)                                        \
 289                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
 290
 291 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 292 #define IRQENTRY_TEXT                                                   \
 293                 ALIGN_FUNCTION();                                       \
 294                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 295                 *(.irqentry.text)                                       \
 296                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
 297 #else
 298 #define IRQENTRY_TEXT
 299 #endif
 300
 301 /* Section used for early init (in .S files) */
 302 #define HEAD_TEXT  *(.head.text)
 303
 304 /* init and exit section handling */
 305 #define INIT_DATA                                                       \
 306         *(.init.data)                                                   \
 307         DEV_DISCARD(init.data)                                          \
 308         DEV_DISCARD(init.rodata)                                        \
 309         CPU_DISCARD(init.data)                                          \
 310         CPU_DISCARD(init.rodata)                                        \
 311         MEM_DISCARD(init.data)                                          \
 312         MEM_DISCARD(init.rodata)                                        \
 313         /* implement dynamic printk debug */                            \
 314         VMLINUX_SYMBOL(__start___verbose_strings) = .;                  \
 315         *(__verbose_strings)                                            \
 316         VMLINUX_SYMBOL(__stop___verbose_strings) = .;                   \
 317         . = ALIGN(8);                                                   \
 318         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 319         *(__verbose)                                                    \
 320         VMLINUX_SYMBOL(__stop___verbose) = .;
 321
 322 #define INIT_TEXT                                                       \
 323         *(.init.text)                                                   \
 324         DEV_DISCARD(init.text)                                          \
 325         CPU_DISCARD(init.text)                                          \
 326         MEM_DISCARD(init.text)
 327
 328 #define EXIT_DATA                                                       \
 329         *(.exit.data)                                                   \
 330         DEV_DISCARD(exit.data)                                          \
 331         DEV_DISCARD(exit.rodata)                                        \
 332         CPU_DISCARD(exit.data)                                          \
 333         CPU_DISCARD(exit.rodata)                                        \
 334         MEM_DISCARD(exit.data)                                          \
 335         MEM_DISCARD(exit.rodata)
 336
 337 #define EXIT_TEXT                                                       \
 338         *(.exit.text)                                                   \
 339         DEV_DISCARD(exit.text)                                          \
 340         CPU_DISCARD(exit.text)                                          \
 341         MEM_DISCARD(exit.text)
 342
 343                 /* DWARF debug sections.
 344                 Symbols in the DWARF debugging sections are relative to
 345                 the beginning of the section so we begin them at 0.  */
 346 #define DWARF_DEBUG                                                     \
 347                 /* DWARF 1 */                                           \
 348                 .debug          0 : { *(.debug) }                       \
 349                 .line           0 : { *(.line) }                        \
 350                 /* GNU DWARF 1 extensions */                            \
 351                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 352                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 353                 /* DWARF 1.1 and DWARF 2 */                             \
 354                 .debug_aranges  0 : { *(.debug_aranges) }               \
 355                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 356                 /* DWARF 2 */                                           \
 357                 .debug_info     0 : { *(.debug_info                     \
 358                                 .gnu.linkonce.wi.*) }                   \
 359                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 360                 .debug_line     0 : { *(.debug_line) }                  \
 361                 .debug_frame    0 : { *(.debug_frame) }                 \
 362                 .debug_str      0 : { *(.debug_str) }                   \
 363                 .debug_loc      0 : { *(.debug_loc) }                   \
 364                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 365                 /* SGI/MIPS DWARF 2 extensions */                       \
 366                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 367                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 368                 .debug_typenames 0 : { *(.debug_typenames) }            \
 369                 .debug_varnames  0 : { *(.debug_varnames) }             \
 370
 371                 /* Stabs debugging sections.  */
 372 #define STABS_DEBUG                                                     \
 373                 .stab 0 : { *(.stab) }                                  \
 374                 .stabstr 0 : { *(.stabstr) }                            \
 375                 .stab.excl 0 : { *(.stab.excl) }                        \
 376                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 377                 .stab.index 0 : { *(.stab.index) }                      \
 378                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 379                 .comment 0 : { *(.comment) }
 380
 381 #ifdef CONFIG_GENERIC_BUG
 382 #define BUG_TABLE                                                       \
 383         . = ALIGN(8);                                                   \
 384         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 385                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 386                 *(__bug_table)                                          \
 387                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 388         }
 389 #else
 390 #define BUG_TABLE
 391 #endif
 392
 393 #ifdef CONFIG_PM_TRACE
 394 #define TRACEDATA                                                       \
 395         . = ALIGN(4);                                                   \
 396         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 397                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 398                 *(.tracedata)                                           \
 399                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 400         }
 401 #else
 402 #define TRACEDATA
 403 #endif
 404
 405 #define NOTES                                                           \
 406         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 407                 VMLINUX_SYMBOL(__start_notes) = .;                      \
 408                 *(.note.*)                                              \
 409                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
 410         }
 411
 412 #define INITCALLS                                                       \
 413         *(.initcallearly.init)                                          \
 414         VMLINUX_SYMBOL(__early_initcall_end) = .;                       \
 415         *(.initcall0.init)                                              \
 416         *(.initcall0s.init)                                             \
 417         *(.initcall1.init)                                              \
 418         *(.initcall1s.init)                                             \
 419         *(.initcall2.init)                                              \
 420         *(.initcall2s.init)                                             \
 421         *(.initcall3.init)                                              \
 422         *(.initcall3s.init)                                             \
 423         *(.initcall4.init)                                              \
 424         *(.initcall4s.init)                                             \
 425         *(.initcall5.init)                                              \
 426         *(.initcall5s.init)                                             \
 427         *(.initcallrootfs.init)                                         \
 428         *(.initcall6.init)                                              \
 429         *(.initcall6s.init)                                             \
 430         *(.initcall7.init)                                              \
 431         *(.initcall7s.init)
 432
 433 /**
 434  * PERCPU_VADDR - define output section for percpu area
 435  * @vaddr: explicit base address (optional)
 436  * @phdr: destination PHDR (optional)
 437  *
 438  * Macro which expands to output section for percpu area.  If @vaddr
 439  * is not blank, it specifies explicit base address and all percpu
 440  * symbols will be offset from the given address.  If blank, @vaddr
 441  * always equals @laddr + LOAD_OFFSET.
 442  *
 443  * @phdr defines the output PHDR to use if not blank.  Be warned that
 444  * output PHDR is sticky.  If @phdr is specified, the next output
 445  * section in the linker script will go there too.  @phdr should have
 446  * a leading colon.
 447  *
 448  * Note that this macros defines __per_cpu_load as an absolute symbol.
 449  * If there is no need to put the percpu section at a predetermined
 450  * address, use PERCPU().
 451  */
 452 #define PERCPU_VADDR(vaddr, phdr)                                       \
 453         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 454         .data.percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)          \
 455                                 - LOAD_OFFSET) {                        \
 456                 VMLINUX_SYMBOL(__per_cpu_start) = .;                    \
 457                 *(.data.percpu.first)                                   \
 458                 *(.data.percpu.page_aligned)                            \
 459                 *(.data.percpu)                                         \
 460                 *(.data.percpu.shared_aligned)                          \
 461                 VMLINUX_SYMBOL(__per_cpu_end) = .;                      \
 462         } phdr                                                          \
 463         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data.percpu);
 464
 465 /**
 466  * PERCPU - define output section for percpu area, simple version
 467  * @align: required alignment
 468  *
 469  * Align to @align and outputs output section for percpu area.  This
 470  * macro doesn't maniuplate @vaddr or @phdr and __per_cpu_load and
 471  * __per_cpu_start will be identical.
 472  *
 473  * This macro is equivalent to ALIGN(align); PERCPU_VADDR( , ) except
 474  * that __per_cpu_load is defined as a relative symbol against
 475  * .data.percpu which is required for relocatable x86_32
 476  * configuration.
 477  */
 478 #define PERCPU(align)                                                   \
 479         . = ALIGN(align);                                               \
 480         .data.percpu    : AT(ADDR(.data.percpu) - LOAD_OFFSET) {        \
 481                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 482                 VMLINUX_SYMBOL(__per_cpu_start) = .;                    \
 483                 *(.data.percpu.first)                                   \
 484                 *(.data.percpu.page_aligned)                            \
 485                 *(.data.percpu)                                         \
 486                 *(.data.percpu.shared_aligned)                          \
 487                 VMLINUX_SYMBOL(__per_cpu_end) = .;                      \
 488         }