target/linux/generic/patches-3.18/220-gc_sections.patch

   1 From: Felix Fietkau <nbd@openwrt.org>
   2
   3 use -ffunction-sections, -fdata-sections and --gc-sections
   4
   5 In combination with kernel symbol export stripping this significantly reduces
   6 the kernel image size. Used on both ARM and MIPS architectures.
   7
   8 Signed-off-by: Felix Fietkau <nbd@openwrt.org>
   9 Signed-off-by: Jonas Gorski <jogo@openwrt.org>
  10 Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
  11 ---
  12
  13 --- a/arch/mips/Makefile
  14 +++ b/arch/mips/Makefile
  15 @@ -89,10 +89,14 @@ all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlin
  16  #
  17  cflags-y                       += -G 0 -mno-abicalls -fno-pic -pipe
  18  cflags-y                       += -msoft-float
  19 -LDFLAGS_vmlinux                        += -G 0 -static -n -nostdlib
  20 +LDFLAGS_vmlinux                        += -G 0 -static -n -nostdlib --gc-sections
  21  KBUILD_AFLAGS_MODULE           += -mlong-calls
  22  KBUILD_CFLAGS_MODULE           += -mlong-calls
  23
  24 +ifndef CONFIG_FUNCTION_TRACER
  25 +KBUILD_CFLAGS_KERNEL           += -ffunction-sections -fdata-sections
  26 +endif
  27 +
  28  #
  29  # pass -msoft-float to GAS if it supports it.  However on newer binutils
  30  # (specifically newer than 2.24.51.20140728) we then also need to explicitly
  31 --- a/arch/mips/kernel/vmlinux.lds.S
  32 +++ b/arch/mips/kernel/vmlinux.lds.S
  33 @@ -67,7 +67,7 @@ SECTIONS
  34         /* Exception table for data bus errors */
  35         __dbe_table : {
  36                 __start___dbe_table = .;
  37 -               *(__dbe_table)
  38 +               KEEP(*(__dbe_table))
  39                 __stop___dbe_table = .;
  40         }
  41
  42 @@ -112,7 +112,7 @@ SECTIONS
  43         . = ALIGN(4);
  44         .mips.machines.init : AT(ADDR(.mips.machines.init) - LOAD_OFFSET) {
  45                 __mips_machines_start = .;
  46 -               *(.mips.machines.init)
  47 +               KEEP(*(.mips.machines.init))
  48                 __mips_machines_end = .;
  49         }
  50
  51 --- a/include/asm-generic/vmlinux.lds.h
  52 +++ b/include/asm-generic/vmlinux.lds.h
  53 @@ -89,7 +89,7 @@
  54  #ifdef CONFIG_FTRACE_MCOUNT_RECORD
  55  #define MCOUNT_REC()   . = ALIGN(8);                           \
  56                         VMLINUX_SYMBOL(__start_mcount_loc) = .; \
  57 -                       *(__mcount_loc)                         \
  58 +                       KEEP(*(__mcount_loc))                   \
  59                         VMLINUX_SYMBOL(__stop_mcount_loc) = .;
  60  #else
  61  #define MCOUNT_REC()
  62 @@ -97,7 +97,7 @@
  63
  64  #ifdef CONFIG_TRACE_BRANCH_PROFILING
  65  #define LIKELY_PROFILE()       VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
  66 -                               *(_ftrace_annotated_branch)                           \
  67 +                               KEEP(*(_ftrace_annotated_branch))                     \
  68                                 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
  69  #else
  70  #define LIKELY_PROFILE()
  71 @@ -105,7 +105,7 @@
  72
  73  #ifdef CONFIG_PROFILE_ALL_BRANCHES
  74  #define BRANCH_PROFILE()       VMLINUX_SYMBOL(__start_branch_profile) = .;   \
  75 -                               *(_ftrace_branch)                             \
  76 +                               KEEP(*(_ftrace_branch))                       \
  77                                 VMLINUX_SYMBOL(__stop_branch_profile) = .;
  78  #else
  79  #define BRANCH_PROFILE()
  80 @@ -114,7 +114,7 @@
  81  #ifdef CONFIG_KPROBES
  82  #define KPROBE_BLACKLIST()     . = ALIGN(8);                                 \
  83                                 VMLINUX_SYMBOL(__start_kprobe_blacklist) = .; \
  84 -                               *(_kprobe_blacklist)                          \
  85 +                               KEEP(*(_kprobe_blacklist))                    \
  86                                 VMLINUX_SYMBOL(__stop_kprobe_blacklist) = .;
  87  #else
  88  #define KPROBE_BLACKLIST()
  89 @@ -123,7 +123,7 @@
  90  #ifdef CONFIG_EVENT_TRACING
  91  #define FTRACE_EVENTS()        . = ALIGN(8);                                   \
  92                         VMLINUX_SYMBOL(__start_ftrace_events) = .;      \
  93 -                       *(_ftrace_events)                               \
  94 +                       KEEP(*(_ftrace_events))                         \
  95                         VMLINUX_SYMBOL(__stop_ftrace_events) = .;
  96  #else
  97  #define FTRACE_EVENTS()
  98 @@ -131,7 +131,7 @@
  99
 100  #ifdef CONFIG_TRACING
 101  #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
 102 -                        *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
 103 +                        KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
 104                          VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
 105  #define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .; \
 106                          *(__tracepoint_str) /* Trace_printk fmt' pointer */ \
 107 @@ -144,7 +144,7 @@
 108  #ifdef CONFIG_FTRACE_SYSCALLS
 109  #define TRACE_SYSCALLS() . = ALIGN(8);                                 \
 110                          VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
 111 -                        *(__syscalls_metadata)                         \
 112 +                        KEEP(*(__syscalls_metadata))                   \
 113                          VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
 114  #else
 115  #define TRACE_SYSCALLS()
 116 @@ -158,8 +158,8 @@
 117  #define _OF_TABLE_1(name)                                              \
 118         . = ALIGN(8);                                                   \
 119         VMLINUX_SYMBOL(__##name##_of_table) = .;                        \
 120 -       *(__##name##_of_table)                                          \
 121 -       *(__##name##_of_table_end)
 122 +       KEEP(*(__##name##_of_table))                                    \
 123 +       KEEP(*(__##name##_of_table_end))
 124
 125  #define CLKSRC_OF_TABLES()     OF_TABLE(CONFIG_CLKSRC_OF, clksrc)
 126  #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
 127 @@ -171,7 +171,7 @@
 128  #define KERNEL_DTB()                                                   \
 129         STRUCT_ALIGN();                                                 \
 130         VMLINUX_SYMBOL(__dtb_start) = .;                                \
 131 -       *(.dtb.init.rodata)                                             \
 132 +       KEEP(*(.dtb.init.rodata))                                       \
 133         VMLINUX_SYMBOL(__dtb_end) = .;
 134
 135  /* .data section */
 136 @@ -187,16 +187,17 @@
 137         /* implement dynamic printk debug */                            \
 138         . = ALIGN(8);                                                   \
 139         VMLINUX_SYMBOL(__start___jump_table) = .;                       \
 140 -       *(__jump_table)                                                 \
 141 +       KEEP(*(__jump_table))                                           \
 142         VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
 143         . = ALIGN(8);                                                   \
 144         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 145 -       *(__verbose)                                                    \
 146 +       KEEP(*(__verbose))                                              \
 147         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 148         LIKELY_PROFILE()                                                \
 149         BRANCH_PROFILE()                                                \
 150         TRACE_PRINTKS()                                                 \
 151 -       TRACEPOINT_STR()
 152 +       TRACEPOINT_STR()                                                \
 153 +       *(.data.[a-zA-Z_]*)
 154
 155  /*
 156   * Data section helpers
 157 @@ -250,35 +251,35 @@
 158         /* PCI quirks */                                                \
 159         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 160                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 161 -               *(.pci_fixup_early)                                     \
 162 +               KEEP(*(.pci_fixup_early))                               \
 163                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 164                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 165 -               *(.pci_fixup_header)                                    \
 166 +               KEEP(*(.pci_fixup_header))                              \
 167                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 168                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 169 -               *(.pci_fixup_final)                                     \
 170 +               KEEP(*(.pci_fixup_final))                               \
 171                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 172                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 173 -               *(.pci_fixup_enable)                                    \
 174 +               KEEP(*(.pci_fixup_enable))                              \
 175                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 176                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 177 -               *(.pci_fixup_resume)                                    \
 178 +               KEEP(*(.pci_fixup_resume))                              \
 179                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 180                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 181 -               *(.pci_fixup_resume_early)                              \
 182 +               KEEP(*(.pci_fixup_resume_early))                        \
 183                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 184                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 185 -               *(.pci_fixup_suspend)                                   \
 186 +               KEEP(*(.pci_fixup_suspend))                             \
 187                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 188                 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .;    \
 189 -               *(.pci_fixup_suspend_late)                              \
 190 +               KEEP(*(.pci_fixup_suspend_late))                        \
 191                 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .;      \
 192         }                                                               \
 193                                                                         \
 194         /* Built-in firmware blobs */                                   \
 195         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 196                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 197 -               *(.builtin_fw)                                          \
 198 +               KEEP(*(.builtin_fw))                                    \
 199                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 200         }                                                               \
 201                                                                         \
 202 @@ -287,49 +288,49 @@
 203         /* Kernel symbol table: Normal symbols */                       \
 204         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 205                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 206 -               *(SORT(___ksymtab+*))                                   \
 207 +               KEEP(*(SORT(___ksymtab+*)))                             \
 208                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 209         }                                                               \
 210                                                                         \
 211         /* Kernel symbol table: GPL-only symbols */                     \
 212         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 213                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 214 -               *(SORT(___ksymtab_gpl+*))                               \
 215 +               KEEP(*(SORT(___ksymtab_gpl+*)))                         \
 216                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 217         }                                                               \
 218                                                                         \
 219         /* Kernel symbol table: Normal unused symbols */                \
 220         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 221                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 222 -               *(SORT(___ksymtab_unused+*))                            \
 223 +               KEEP(*(SORT(___ksymtab_unused+*)))                      \
 224                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 225         }                                                               \
 226                                                                         \
 227         /* Kernel symbol table: GPL-only unused symbols */              \
 228         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 229                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 230 -               *(SORT(___ksymtab_unused_gpl+*))                        \
 231 +               KEEP(*(SORT(___ksymtab_unused_gpl+*)))                  \
 232                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 233         }                                                               \
 234                                                                         \
 235         /* Kernel symbol table: GPL-future-only symbols */              \
 236         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 237                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 238 -               *(SORT(___ksymtab_gpl_future+*))                        \
 239 +               KEEP(*(SORT(___ksymtab_gpl_future+*)))                  \
 240                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 241         }                                                               \
 242                                                                         \
 243         /* Kernel symbol table: Normal symbols */                       \
 244         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 245                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 246 -               *(SORT(___kcrctab+*))                                   \
 247 +               KEEP(*(SORT(___kcrctab+*)))                             \
 248                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 249         }                                                               \
 250                                                                         \
 251         /* Kernel symbol table: GPL-only symbols */                     \
 252         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 253                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 254 -               *(SORT(___kcrctab_gpl+*))                               \
 255 +               KEEP(*(SORT(___kcrctab_gpl+*)))                         \
 256                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 257         }                                                               \
 258                                                                         \
 259 @@ -343,14 +344,14 @@
 260         /* Kernel symbol table: GPL-only unused symbols */              \
 261         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 262                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 263 -               *(SORT(___kcrctab_unused_gpl+*))                        \
 264 +               KEEP(*(SORT(___kcrctab_unused_gpl+*)))                  \
 265                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 266         }                                                               \
 267                                                                         \
 268         /* Kernel symbol table: GPL-future-only symbols */              \
 269         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 270                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 271 -               *(SORT(___kcrctab_gpl_future+*))                        \
 272 +               KEEP(*(SORT(___kcrctab_gpl_future+*)))                  \
 273                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 274         }                                                               \
 275                                                                         \
 276 @@ -369,14 +370,14 @@
 277         /* Built-in module parameters. */                               \
 278         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 279                 VMLINUX_SYMBOL(__start___param) = .;                    \
 280 -               *(__param)                                              \
 281 +               KEEP(*(__param))                                        \
 282                 VMLINUX_SYMBOL(__stop___param) = .;                     \
 283         }                                                               \
 284                                                                         \
 285         /* Built-in module versions. */                                 \
 286         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 287                 VMLINUX_SYMBOL(__start___modver) = .;                   \
 288 -               *(__modver)                                             \
 289 +               KEEP(*(__modver))                                       \
 290                 VMLINUX_SYMBOL(__stop___modver) = .;                    \
 291                 . = ALIGN((align));                                     \
 292                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 293 @@ -432,7 +433,7 @@
 294  #define ENTRY_TEXT                                                     \
 295                 ALIGN_FUNCTION();                                       \
 296                 VMLINUX_SYMBOL(__entry_text_start) = .;                 \
 297 -               *(.entry.text)                                          \
 298 +               KEEP(*(.entry.text))                                    \
 299                 VMLINUX_SYMBOL(__entry_text_end) = .;
 300
 301  #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 302 @@ -460,7 +461,7 @@
 303         . = ALIGN(align);                                               \
 304         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 305                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 306 -               *(__ex_table)                                           \
 307 +               KEEP(*(__ex_table))                                             \
 308                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 309         }
 310
 311 @@ -476,8 +477,8 @@
 312  #ifdef CONFIG_CONSTRUCTORS
 313  #define KERNEL_CTORS() . = ALIGN(8);                      \
 314                         VMLINUX_SYMBOL(__ctors_start) = .; \
 315 -                       *(.ctors)                          \
 316 -                       *(.init_array)                     \
 317 +                       KEEP(*(.ctors))                    \
 318 +                       KEEP(*(.init_array))               \
 319                         VMLINUX_SYMBOL(__ctors_end) = .;
 320  #else
 321  #define KERNEL_CTORS()
 322 @@ -525,7 +526,7 @@
 323  #define SBSS(sbss_align)                                               \
 324         . = ALIGN(sbss_align);                                          \
 325         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 326 -               *(.sbss)                                                \
 327 +               *(.sbss .sbss.*)                                        \
 328                 *(.scommon)                                             \
 329         }
 330
 331 @@ -543,7 +544,7 @@
 332                 BSS_FIRST_SECTIONS                                      \
 333                 *(.bss..page_aligned)                                   \
 334                 *(.dynbss)                                              \
 335 -               *(.bss)                                                 \
 336 +               *(.bss .bss.*)                                          \
 337                 *(COMMON)                                               \
 338         }
 339
 340 @@ -592,7 +593,7 @@
 341         . = ALIGN(8);                                                   \
 342         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 343                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 344 -               *(__bug_table)                                          \
 345 +               KEEP(*(__bug_table))                                    \
 346                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 347         }
 348  #else
 349 @@ -604,7 +605,7 @@
 350         . = ALIGN(4);                                                   \
 351         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 352                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 353 -               *(.tracedata)                                           \
 354 +               KEEP(*(.tracedata))                                     \
 355                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 356         }
 357  #else
 358 @@ -621,17 +622,17 @@
 359  #define INIT_SETUP(initsetup_align)                                    \
 360                 . = ALIGN(initsetup_align);                             \
 361                 VMLINUX_SYMBOL(__setup_start) = .;                      \
 362 -               *(.init.setup)                                          \
 363 +               KEEP(*(.init.setup))                                    \
 364                 VMLINUX_SYMBOL(__setup_end) = .;
 365
 366  #define INIT_CALLS_LEVEL(level)                                                \
 367                 VMLINUX_SYMBOL(__initcall##level##_start) = .;          \
 368 -               *(.initcall##level##.init)                              \
 369 -               *(.initcall##level##s.init)                             \
 370 +               KEEP(*(.initcall##level##.init))                        \
 371 +               KEEP(*(.initcall##level##s.init))                       \
 372
 373  #define INIT_CALLS                                                     \
 374                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
 375 -               *(.initcallearly.init)                                  \
 376 +               KEEP(*(.initcallearly.init))                            \
 377                 INIT_CALLS_LEVEL(0)                                     \
 378                 INIT_CALLS_LEVEL(1)                                     \
 379                 INIT_CALLS_LEVEL(2)                                     \
 380 @@ -645,21 +646,21 @@
 381
 382  #define CON_INITCALL                                                   \
 383                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 384 -               *(.con_initcall.init)                                   \
 385 +               KEEP(*(.con_initcall.init))                             \
 386                 VMLINUX_SYMBOL(__con_initcall_end) = .;
 387
 388  #define SECURITY_INITCALL                                              \
 389                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 390 -               *(.security_initcall.init)                              \
 391 +               KEEP(*(.security_initcall.init))                        \
 392                 VMLINUX_SYMBOL(__security_initcall_end) = .;
 393
 394  #ifdef CONFIG_BLK_DEV_INITRD
 395  #define INIT_RAM_FS                                                    \
 396         . = ALIGN(4);                                                   \
 397         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 398 -       *(.init.ramfs)                                                  \
 399 +       KEEP(*(.init.ramfs))                                            \
 400         . = ALIGN(8);                                                   \
 401 -       *(.init.ramfs.info)
 402 +       KEEP(*(.init.ramfs.info))
 403  #else
 404  #define INIT_RAM_FS
 405  #endif
 406 --- a/arch/arm/Makefile
 407 +++ b/arch/arm/Makefile
 408 @@ -18,11 +18,16 @@ ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
 409  LDFLAGS_vmlinux        += --be8
 410  LDFLAGS_MODULE += --be8
 411  endif
 412 +LDFLAGS_vmlinux += --gc-sections
 413
 414  OBJCOPYFLAGS   :=-O binary -R .comment -S
 415  GZFLAGS                :=-9
 416  #KBUILD_CFLAGS +=-pipe
 417
 418 +ifndef CONFIG_FUNCTION_TRACER
 419 +KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 420 +endif
 421 +
 422  # Never generate .eh_frame
 423  KBUILD_CFLAGS  += $(call cc-option,-fno-dwarf2-cfi-asm)
 424
 425 --- a/arch/arm/kernel/vmlinux.lds.S
 426 +++ b/arch/arm/kernel/vmlinux.lds.S
 427 @@ -12,13 +12,13 @@
 428  #define PROC_INFO                                                      \
 429         . = ALIGN(4);                                                   \
 430         VMLINUX_SYMBOL(__proc_info_begin) = .;                          \
 431 -       *(.proc.info.init)                                              \
 432 +       KEEP(*(.proc.info.init))                                        \
 433         VMLINUX_SYMBOL(__proc_info_end) = .;
 434
 435  #define IDMAP_TEXT                                                     \
 436         ALIGN_FUNCTION();                                               \
 437         VMLINUX_SYMBOL(__idmap_text_start) = .;                         \
 438 -       *(.idmap.text)                                                  \
 439 +       KEEP(*(.idmap.text))                                            \
 440         VMLINUX_SYMBOL(__idmap_text_end) = .;                           \
 441         . = ALIGN(32);                                                  \
 442         VMLINUX_SYMBOL(__hyp_idmap_text_start) = .;                     \
 443 @@ -93,7 +93,7 @@ SECTIONS
 444         .text : {                       /* Real text segment            */
 445                 _stext = .;             /* Text and read-only data      */
 446                         __exception_text_start = .;
 447 -                       *(.exception.text)
 448 +                       KEEP(*(.exception.text))
 449                         __exception_text_end = .;
 450                         IRQENTRY_TEXT
 451                         TEXT_TEXT
 452 @@ -118,7 +118,7 @@ SECTIONS
 453         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
 454                 __start___ex_table = .;
 455  #ifdef CONFIG_MMU
 456 -               *(__ex_table)
 457 +               KEEP(*(__ex_table))
 458  #endif
 459                 __stop___ex_table = .;
 460         }
 461 @@ -130,12 +130,12 @@ SECTIONS
 462         . = ALIGN(8);
 463         .ARM.unwind_idx : {
 464                 __start_unwind_idx = .;
 465 -               *(.ARM.exidx*)
 466 +               KEEP(*(.ARM.exidx*))
 467                 __stop_unwind_idx = .;
 468         }
 469         .ARM.unwind_tab : {
 470                 __start_unwind_tab = .;
 471 -               *(.ARM.extab*)
 472 +               KEEP(*(.ARM.extab*))
 473                 __stop_unwind_tab = .;
 474         }
 475  #endif
 476 @@ -154,14 +154,14 @@ SECTIONS
 477          */
 478         __vectors_start = .;
 479         .vectors 0 : AT(__vectors_start) {
 480 -               *(.vectors)
 481 +               KEEP(*(.vectors))
 482         }
 483         . = __vectors_start + SIZEOF(.vectors);
 484         __vectors_end = .;
 485
 486         __stubs_start = .;
 487         .stubs 0x1000 : AT(__stubs_start) {
 488 -               *(.stubs)
 489 +               KEEP(*(.stubs))
 490         }
 491         . = __stubs_start + SIZEOF(.stubs);
 492         __stubs_end = .;
 493 @@ -175,24 +175,24 @@ SECTIONS
 494         }
 495         .init.arch.info : {
 496                 __arch_info_begin = .;
 497 -               *(.arch.info.init)
 498 +               KEEP(*(.arch.info.init))
 499                 __arch_info_end = .;
 500         }
 501         .init.tagtable : {
 502                 __tagtable_begin = .;
 503 -               *(.taglist.init)
 504 +               KEEP(*(.taglist.init))
 505                 __tagtable_end = .;
 506         }
 507  #ifdef CONFIG_SMP_ON_UP
 508         .init.smpalt : {
 509                 __smpalt_begin = .;
 510 -               *(.alt.smp.init)
 511 +               KEEP(*(.alt.smp.init))
 512                 __smpalt_end = .;
 513         }
 514  #endif
 515         .init.pv_table : {
 516                 __pv_table_begin = .;
 517 -               *(.pv_table)
 518 +               KEEP(*(.pv_table))
 519                 __pv_table_end = .;
 520         }
 521         .init.data : {
 522 --- a/arch/arm/boot/compressed/Makefile
 523 +++ b/arch/arm/boot/compressed/Makefile
 524 @@ -122,6 +122,7 @@ ifeq ($(CONFIG_FUNCTION_TRACER),y)
 525  ORIG_CFLAGS := $(KBUILD_CFLAGS)
 526  KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS))
 527  endif
 528 +KBUILD_CFLAGS_KERNEL := $(patsubst -f%-sections,,$(KBUILD_CFLAGS_KERNEL))
 529
 530  ccflags-y := -fpic -mno-single-pic-base -fno-builtin -I$(obj)
 531  asflags-y := -DZIMAGE