Commit 4b89b7f7 authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michal Marek
Browse files

kbuild: keep data tables through dead code elimination 



When CONFIG_LD_DEAD_CODE_DATA_ELIMINATION is enabled we must ensure
that we still keep various programatically-accessed tables.

[npiggin: Fold Paul's patches into one, and add a few more tables.
 diff symbol tables of allyesconfig with/without -gc-sections shows up
 lost tables quite easily.]

Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarMichal Marek <mmarek@suse.com>
parent 9da2f584

include/asm-generic/vmlinux.lds.h

+34 −34
Original line number Diff line number Diff line
@@ -114,7 +114,7 @@ 
#ifdef CONFIG_KPROBES

#define KPROBE_BLACKLIST()	. = ALIGN(8);				      \

				VMLINUX_SYMBOL(__start_kprobe_blacklist) = .; \

				*(_kprobe_blacklist)			      \

				KEEP(*(_kprobe_blacklist))		      \

				VMLINUX_SYMBOL(__stop_kprobe_blacklist) = .;

#else

#define KPROBE_BLACKLIST()
@@ -123,10 +123,10 @@ 
#ifdef CONFIG_EVENT_TRACING

#define FTRACE_EVENTS()	. = ALIGN(8);					\

			VMLINUX_SYMBOL(__start_ftrace_events) = .;	\

			*(_ftrace_events)				\

			KEEP(*(_ftrace_events))				\

			VMLINUX_SYMBOL(__stop_ftrace_events) = .;	\

			VMLINUX_SYMBOL(__start_ftrace_enum_maps) = .;	\

			*(_ftrace_enum_map)				\

			KEEP(*(_ftrace_enum_map))			\

			VMLINUX_SYMBOL(__stop_ftrace_enum_maps) = .;

#else

#define FTRACE_EVENTS()
@@ -134,10 +134,10 @@ 


#ifdef CONFIG_TRACING

#define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \

			 *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \

			 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \

			 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;

#define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .;	\

			 *(__tracepoint_str) /* Trace_printk fmt' pointer */ \

			 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \

			 VMLINUX_SYMBOL(__stop___tracepoint_str) = .;

#else

#define TRACE_PRINTKS()
@@ -147,7 +147,7 @@ 
#ifdef CONFIG_FTRACE_SYSCALLS

#define TRACE_SYSCALLS() . = ALIGN(8);					\

			 VMLINUX_SYMBOL(__start_syscalls_metadata) = .;	\

			 *(__syscalls_metadata)				\

			 KEEP(*(__syscalls_metadata))			\

			 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;

#else

#define TRACE_SYSCALLS()
@@ -156,7 +156,7 @@ 
#ifdef CONFIG_SERIAL_EARLYCON

#define EARLYCON_TABLE() STRUCT_ALIGN();			\

			 VMLINUX_SYMBOL(__earlycon_table) = .;	\

			 *(__earlycon_table)			\

			 KEEP(*(__earlycon_table))		\

			 VMLINUX_SYMBOL(__earlycon_table_end) = .;

#else

#define EARLYCON_TABLE()
@@ -169,8 +169,8 @@ 
#define _OF_TABLE_1(name)						\

	. = ALIGN(8);							\

	VMLINUX_SYMBOL(__##name##_of_table) = .;			\

	*(__##name##_of_table)						\

	*(__##name##_of_table_end)

	KEEP(*(__##name##_of_table))					\

	KEEP(*(__##name##_of_table_end))



#define CLKSRC_OF_TABLES()	OF_TABLE(CONFIG_CLKSRC_OF, clksrc)

#define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
@@ -184,7 +184,7 @@ 
#define ACPI_PROBE_TABLE(name)						\

	. = ALIGN(8);							\

	VMLINUX_SYMBOL(__##name##_acpi_probe_table) = .;		\

	*(__##name##_acpi_probe_table)					\

	KEEP(*(__##name##_acpi_probe_table))				\

	VMLINUX_SYMBOL(__##name##_acpi_probe_table_end) = .;

#else

#define ACPI_PROBE_TABLE(name)
@@ -193,7 +193,7 @@ 
#define KERNEL_DTB()							\

	STRUCT_ALIGN();							\

	VMLINUX_SYMBOL(__dtb_start) = .;				\

	*(.dtb.init.rodata)						\

	KEEP(*(.dtb.init.rodata))					\

	VMLINUX_SYMBOL(__dtb_end) = .;



/*
@@ -214,11 +214,11 @@ 
	/* implement dynamic printk debug */				\

	. = ALIGN(8);                                                   \

	VMLINUX_SYMBOL(__start___jump_table) = .;                       \

	*(__jump_table)                                                 \

	KEEP(*(__jump_table))                                           \

	VMLINUX_SYMBOL(__stop___jump_table) = .;                        \

	. = ALIGN(8);							\

	VMLINUX_SYMBOL(__start___verbose) = .;                          \

	*(__verbose)                                                    \

	KEEP(*(__verbose))                                              \

	VMLINUX_SYMBOL(__stop___verbose) = .;				\

	LIKELY_PROFILE()		       				\

	BRANCH_PROFILE()						\
@@ -271,10 +271,10 @@ 
		VMLINUX_SYMBOL(__start_rodata) = .;			\

		*(.rodata) *(.rodata.*)					\

		RO_AFTER_INIT_DATA	/* Read only after init */	\

		*(__vermagic)		/* Kernel version magic */	\

		KEEP(*(__vermagic))	/* Kernel version magic */	\

		. = ALIGN(8);						\

		VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;		\

		*(__tracepoints_ptrs)	/* Tracepoints: pointer array */\

		KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \

		VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .;		\

		*(__tracepoints_strings)/* Tracepoints: strings */	\

	}								\
@@ -288,35 +288,35 @@ 
	/* PCI quirks */						\

	.pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {	\

		VMLINUX_SYMBOL(__start_pci_fixups_early) = .;		\

		*(.pci_fixup_early)					\

		KEEP(*(.pci_fixup_early))				\

		VMLINUX_SYMBOL(__end_pci_fixups_early) = .;		\

		VMLINUX_SYMBOL(__start_pci_fixups_header) = .;		\

		*(.pci_fixup_header)					\

		KEEP(*(.pci_fixup_header))				\

		VMLINUX_SYMBOL(__end_pci_fixups_header) = .;		\

		VMLINUX_SYMBOL(__start_pci_fixups_final) = .;		\

		*(.pci_fixup_final)					\

		KEEP(*(.pci_fixup_final))				\

		VMLINUX_SYMBOL(__end_pci_fixups_final) = .;		\

		VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;		\

		*(.pci_fixup_enable)					\

		KEEP(*(.pci_fixup_enable))				\

		VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;		\

		VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;		\

		*(.pci_fixup_resume)					\

		KEEP(*(.pci_fixup_resume))				\

		VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;		\

		VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;	\

		*(.pci_fixup_resume_early)				\

		KEEP(*(.pci_fixup_resume_early))			\

		VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;	\

		VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;		\

		*(.pci_fixup_suspend)					\

		KEEP(*(.pci_fixup_suspend))				\

		VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;		\

		VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .;	\

		*(.pci_fixup_suspend_late)				\

		KEEP(*(.pci_fixup_suspend_late))			\

		VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .;	\

	}								\

									\

	/* Built-in firmware blobs */					\

	.builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {	\

		VMLINUX_SYMBOL(__start_builtin_fw) = .;			\

		*(.builtin_fw)						\

		KEEP(*(.builtin_fw))					\

		VMLINUX_SYMBOL(__end_builtin_fw) = .;			\

	}								\

									\
@@ -394,7 +394,7 @@ 
									\

	/* Kernel symbol table: strings */				\

        __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) {	\

		KEEP(*(__ksymtab_strings))				\

		*(__ksymtab_strings)					\

	}								\

									\

	/* __*init sections */						\
@@ -407,14 +407,14 @@ 
	/* Built-in module parameters. */				\

	__param : AT(ADDR(__param) - LOAD_OFFSET) {			\

		VMLINUX_SYMBOL(__start___param) = .;			\

		*(__param)						\

		KEEP(*(__param))					\

		VMLINUX_SYMBOL(__stop___param) = .;			\

	}								\

									\

	/* Built-in module versions. */					\

	__modver : AT(ADDR(__modver) - LOAD_OFFSET) {			\

		VMLINUX_SYMBOL(__start___modver) = .;			\

		*(__modver)						\

		KEEP(*(__modver))					\

		VMLINUX_SYMBOL(__stop___modver) = .;			\

		. = ALIGN((align));					\

		VMLINUX_SYMBOL(__end_rodata) = .;			\
@@ -517,7 +517,7 @@ 
	. = ALIGN(align);						\

	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {		\

		VMLINUX_SYMBOL(__start___ex_table) = .;			\

		*(__ex_table)						\

		KEEP(*(__ex_table))					\

		VMLINUX_SYMBOL(__stop___ex_table) = .;			\

	}
@@ -533,9 +533,9 @@ 
#ifdef CONFIG_CONSTRUCTORS

#define KERNEL_CTORS()	. = ALIGN(8);			   \

			VMLINUX_SYMBOL(__ctors_start) = .; \

			*(.ctors)			   \

			*(SORT(.init_array.*))		   \

			*(.init_array)			   \

			KEEP(*(.ctors))			   \

			KEEP(*(SORT(.init_array.*)))	   \

			KEEP(*(.init_array))		   \

			VMLINUX_SYMBOL(__ctors_end) = .;

#else

#define KERNEL_CTORS()
@@ -659,7 +659,7 @@ 
	. = ALIGN(8);							\

	__bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {		\

		VMLINUX_SYMBOL(__start___bug_table) = .;		\

		*(__bug_table)						\

		KEEP(*(__bug_table))					\

		VMLINUX_SYMBOL(__stop___bug_table) = .;			\

	}

#else
@@ -671,7 +671,7 @@ 
	. = ALIGN(4);							\

	.tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {		\

		VMLINUX_SYMBOL(__tracedata_start) = .;			\

		*(.tracedata)						\

		KEEP(*(.tracedata))					\

		VMLINUX_SYMBOL(__tracedata_end) = .;			\

	}

#else
@@ -688,7 +688,7 @@ 
#define INIT_SETUP(initsetup_align)					\

		. = ALIGN(initsetup_align);				\

		VMLINUX_SYMBOL(__setup_start) = .;			\

		*(.init.setup)						\

		KEEP(*(.init.setup))					\

		VMLINUX_SYMBOL(__setup_end) = .;



#define INIT_CALLS_LEVEL(level)						\

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