linux/arch/ia64/kernel/vmlinux.lds.S
Chris Metcalf 6727ad9e20 nmi_backtrace: generate one-line reports for idle cpus
When doing an nmi backtrace of many cores, most of which are idle, the
output is a little overwhelming and very uninformative.  Suppress
messages for cpus that are idling when they are interrupted and just
emit one line, "NMI backtrace for N skipped: idling at pc 0xNNN".

We do this by grouping all the cpuidle code together into a new
.cpuidle.text section, and then checking the address of the interrupted
PC to see if it lies within that section.

This commit suitably tags x86 and tile idle routines, and only adds in
the minimal framework for other architectures.

Link: http://lkml.kernel.org/r/1472487169-14923-5-git-send-email-cmetcalf@mellanox.com
Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Daniel Thompson <daniel.thompson@linaro.org> [arm]
Tested-by: Petr Mladek <pmladek@suse.com>
Cc: Aaron Tomlin <atomlin@redhat.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07 18:46:30 -07:00

229 lines
4.4 KiB
ArmAsm

#include <asm/cache.h>
#include <asm/ptrace.h>
#include <asm/pgtable.h>
#include <asm-generic/vmlinux.lds.h>
OUTPUT_FORMAT("elf64-ia64-little")
OUTPUT_ARCH(ia64)
ENTRY(phys_start)
jiffies = jiffies_64;
PHDRS {
code PT_LOAD;
percpu PT_LOAD;
data PT_LOAD;
note PT_NOTE;
unwind 0x70000001; /* PT_IA_64_UNWIND, but ld doesn't match the name */
}
SECTIONS {
/*
* unwind exit sections must be discarded before
* the rest of the sections get included.
*/
/DISCARD/ : {
*(.IA_64.unwind.exit.text)
*(.IA_64.unwind_info.exit.text)
*(.comment)
*(.note)
}
v = PAGE_OFFSET; /* this symbol is here to make debugging easier... */
phys_start = _start - LOAD_OFFSET;
code : {
} :code
. = KERNEL_START;
_text = .;
_stext = .;
.text : AT(ADDR(.text) - LOAD_OFFSET) {
__start_ivt_text = .;
*(.text..ivt)
__end_ivt_text = .;
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
*(.gnu.linkonce.t*)
}
.text2 : AT(ADDR(.text2) - LOAD_OFFSET) {
*(.text2)
}
#ifdef CONFIG_SMP
.text..lock : AT(ADDR(.text..lock) - LOAD_OFFSET) {
*(.text..lock)
}
#endif
_etext = .;
/*
* Read-only data
*/
NOTES :code :note /* put .notes in text and mark in PT_NOTE */
code_continues : {
} : code /* switch back to regular program... */
EXCEPTION_TABLE(16)
/* MCA table */
. = ALIGN(16);
__mca_table : AT(ADDR(__mca_table) - LOAD_OFFSET) {
__start___mca_table = .;
*(__mca_table)
__stop___mca_table = .;
}
.data..patch.phys_stack_reg : AT(ADDR(.data..patch.phys_stack_reg) - LOAD_OFFSET) {
__start___phys_stack_reg_patchlist = .;
*(.data..patch.phys_stack_reg)
__end___phys_stack_reg_patchlist = .;
}
/*
* Global data
*/
_data = .;
/* Unwind info & table: */
. = ALIGN(8);
.IA_64.unwind_info : AT(ADDR(.IA_64.unwind_info) - LOAD_OFFSET) {
*(.IA_64.unwind_info*)
}
.IA_64.unwind : AT(ADDR(.IA_64.unwind) - LOAD_OFFSET) {
__start_unwind = .;
*(.IA_64.unwind*)
__end_unwind = .;
} :code :unwind
code_continues2 : {
} : code
RODATA
.opd : AT(ADDR(.opd) - LOAD_OFFSET) {
*(.opd)
}
/*
* Initialization code and data:
*/
. = ALIGN(PAGE_SIZE);
__init_begin = .;
INIT_TEXT_SECTION(PAGE_SIZE)
INIT_DATA_SECTION(16)
.data..patch.vtop : AT(ADDR(.data..patch.vtop) - LOAD_OFFSET) {
__start___vtop_patchlist = .;
*(.data..patch.vtop)
__end___vtop_patchlist = .;
}
.data..patch.rse : AT(ADDR(.data..patch.rse) - LOAD_OFFSET) {
__start___rse_patchlist = .;
*(.data..patch.rse)
__end___rse_patchlist = .;
}
.data..patch.mckinley_e9 : AT(ADDR(.data..patch.mckinley_e9) - LOAD_OFFSET) {
__start___mckinley_e9_bundles = .;
*(.data..patch.mckinley_e9)
__end___mckinley_e9_bundles = .;
}
#if defined(CONFIG_IA64_GENERIC)
/* Machine Vector */
. = ALIGN(16);
.machvec : AT(ADDR(.machvec) - LOAD_OFFSET) {
machvec_start = .;
*(.machvec)
machvec_end = .;
}
#endif
#ifdef CONFIG_SMP
. = ALIGN(PERCPU_PAGE_SIZE);
__cpu0_per_cpu = .;
. = . + PERCPU_PAGE_SIZE; /* cpu0 per-cpu space */
#endif
. = ALIGN(PAGE_SIZE);
__init_end = .;
.data..page_aligned : AT(ADDR(.data..page_aligned) - LOAD_OFFSET) {
PAGE_ALIGNED_DATA(PAGE_SIZE)
. = ALIGN(PAGE_SIZE);
__start_gate_section = .;
*(.data..gate)
__stop_gate_section = .;
}
/*
* make sure the gate page doesn't expose
* kernel data
*/
. = ALIGN(PAGE_SIZE);
/* Per-cpu data: */
. = ALIGN(PERCPU_PAGE_SIZE);
PERCPU_VADDR(SMP_CACHE_BYTES, PERCPU_ADDR, :percpu)
__phys_per_cpu_start = __per_cpu_load;
/*
* ensure percpu data fits
* into percpu page size
*/
. = __phys_per_cpu_start + PERCPU_PAGE_SIZE;
data : {
} :data
.data : AT(ADDR(.data) - LOAD_OFFSET) {
_sdata = .;
INIT_TASK_DATA(PAGE_SIZE)
CACHELINE_ALIGNED_DATA(SMP_CACHE_BYTES)
READ_MOSTLY_DATA(SMP_CACHE_BYTES)
DATA_DATA
*(.data1)
*(.gnu.linkonce.d*)
CONSTRUCTORS
}
. = ALIGN(16); /* gp must be 16-byte aligned for exc. table */
.got : AT(ADDR(.got) - LOAD_OFFSET) {
*(.got.plt)
*(.got)
}
__gp = ADDR(.got) + 0x200000;
/*
* We want the small data sections together,
* so single-instruction offsets can access
* them all, and initialized data all before
* uninitialized, so we can shorten the
* on-disk segment size.
*/
.sdata : AT(ADDR(.sdata) - LOAD_OFFSET) {
*(.sdata)
*(.sdata1)
*(.srdata)
}
_edata = .;
BSS_SECTION(0, 0, 0)
_end = .;
code : {
} :code
STABS_DEBUG
DWARF_DEBUG
/* Default discards */
DISCARDS
}