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6727ad9e20
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>
229 lines
4.4 KiB
ArmAsm
229 lines
4.4 KiB
ArmAsm
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#include <asm/cache.h>
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#include <asm/ptrace.h>
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#include <asm/pgtable.h>
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#include <asm-generic/vmlinux.lds.h>
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OUTPUT_FORMAT("elf64-ia64-little")
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OUTPUT_ARCH(ia64)
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ENTRY(phys_start)
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jiffies = jiffies_64;
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PHDRS {
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code PT_LOAD;
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percpu PT_LOAD;
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data PT_LOAD;
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note PT_NOTE;
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unwind 0x70000001; /* PT_IA_64_UNWIND, but ld doesn't match the name */
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}
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SECTIONS {
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/*
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* unwind exit sections must be discarded before
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* the rest of the sections get included.
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*/
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/DISCARD/ : {
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*(.IA_64.unwind.exit.text)
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*(.IA_64.unwind_info.exit.text)
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*(.comment)
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*(.note)
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}
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v = PAGE_OFFSET; /* this symbol is here to make debugging easier... */
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phys_start = _start - LOAD_OFFSET;
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code : {
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} :code
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. = KERNEL_START;
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_text = .;
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_stext = .;
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.text : AT(ADDR(.text) - LOAD_OFFSET) {
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__start_ivt_text = .;
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*(.text..ivt)
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__end_ivt_text = .;
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TEXT_TEXT
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SCHED_TEXT
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CPUIDLE_TEXT
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LOCK_TEXT
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KPROBES_TEXT
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*(.gnu.linkonce.t*)
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}
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.text2 : AT(ADDR(.text2) - LOAD_OFFSET) {
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*(.text2)
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}
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#ifdef CONFIG_SMP
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.text..lock : AT(ADDR(.text..lock) - LOAD_OFFSET) {
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*(.text..lock)
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}
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#endif
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_etext = .;
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/*
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* Read-only data
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*/
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NOTES :code :note /* put .notes in text and mark in PT_NOTE */
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code_continues : {
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} : code /* switch back to regular program... */
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EXCEPTION_TABLE(16)
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/* MCA table */
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. = ALIGN(16);
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__mca_table : AT(ADDR(__mca_table) - LOAD_OFFSET) {
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__start___mca_table = .;
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*(__mca_table)
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__stop___mca_table = .;
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}
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.data..patch.phys_stack_reg : AT(ADDR(.data..patch.phys_stack_reg) - LOAD_OFFSET) {
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__start___phys_stack_reg_patchlist = .;
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*(.data..patch.phys_stack_reg)
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__end___phys_stack_reg_patchlist = .;
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}
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/*
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* Global data
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*/
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_data = .;
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/* Unwind info & table: */
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. = ALIGN(8);
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.IA_64.unwind_info : AT(ADDR(.IA_64.unwind_info) - LOAD_OFFSET) {
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*(.IA_64.unwind_info*)
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}
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.IA_64.unwind : AT(ADDR(.IA_64.unwind) - LOAD_OFFSET) {
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__start_unwind = .;
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*(.IA_64.unwind*)
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__end_unwind = .;
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} :code :unwind
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code_continues2 : {
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} : code
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RODATA
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.opd : AT(ADDR(.opd) - LOAD_OFFSET) {
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*(.opd)
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}
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/*
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* Initialization code and data:
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*/
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. = ALIGN(PAGE_SIZE);
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__init_begin = .;
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INIT_TEXT_SECTION(PAGE_SIZE)
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INIT_DATA_SECTION(16)
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.data..patch.vtop : AT(ADDR(.data..patch.vtop) - LOAD_OFFSET) {
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__start___vtop_patchlist = .;
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*(.data..patch.vtop)
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__end___vtop_patchlist = .;
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}
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.data..patch.rse : AT(ADDR(.data..patch.rse) - LOAD_OFFSET) {
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__start___rse_patchlist = .;
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*(.data..patch.rse)
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__end___rse_patchlist = .;
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}
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.data..patch.mckinley_e9 : AT(ADDR(.data..patch.mckinley_e9) - LOAD_OFFSET) {
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__start___mckinley_e9_bundles = .;
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*(.data..patch.mckinley_e9)
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__end___mckinley_e9_bundles = .;
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}
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#if defined(CONFIG_IA64_GENERIC)
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/* Machine Vector */
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. = ALIGN(16);
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.machvec : AT(ADDR(.machvec) - LOAD_OFFSET) {
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machvec_start = .;
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*(.machvec)
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machvec_end = .;
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}
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#endif
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#ifdef CONFIG_SMP
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. = ALIGN(PERCPU_PAGE_SIZE);
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__cpu0_per_cpu = .;
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. = . + PERCPU_PAGE_SIZE; /* cpu0 per-cpu space */
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#endif
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. = ALIGN(PAGE_SIZE);
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__init_end = .;
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.data..page_aligned : AT(ADDR(.data..page_aligned) - LOAD_OFFSET) {
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PAGE_ALIGNED_DATA(PAGE_SIZE)
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. = ALIGN(PAGE_SIZE);
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__start_gate_section = .;
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*(.data..gate)
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__stop_gate_section = .;
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}
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/*
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* make sure the gate page doesn't expose
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* kernel data
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*/
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. = ALIGN(PAGE_SIZE);
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/* Per-cpu data: */
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. = ALIGN(PERCPU_PAGE_SIZE);
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PERCPU_VADDR(SMP_CACHE_BYTES, PERCPU_ADDR, :percpu)
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__phys_per_cpu_start = __per_cpu_load;
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/*
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* ensure percpu data fits
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* into percpu page size
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*/
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. = __phys_per_cpu_start + PERCPU_PAGE_SIZE;
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data : {
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} :data
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.data : AT(ADDR(.data) - LOAD_OFFSET) {
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_sdata = .;
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INIT_TASK_DATA(PAGE_SIZE)
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CACHELINE_ALIGNED_DATA(SMP_CACHE_BYTES)
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READ_MOSTLY_DATA(SMP_CACHE_BYTES)
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DATA_DATA
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*(.data1)
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*(.gnu.linkonce.d*)
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CONSTRUCTORS
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}
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. = ALIGN(16); /* gp must be 16-byte aligned for exc. table */
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.got : AT(ADDR(.got) - LOAD_OFFSET) {
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*(.got.plt)
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*(.got)
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}
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__gp = ADDR(.got) + 0x200000;
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/*
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* We want the small data sections together,
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* so single-instruction offsets can access
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* them all, and initialized data all before
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* uninitialized, so we can shorten the
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* on-disk segment size.
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*/
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.sdata : AT(ADDR(.sdata) - LOAD_OFFSET) {
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*(.sdata)
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*(.sdata1)
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*(.srdata)
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}
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_edata = .;
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BSS_SECTION(0, 0, 0)
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_end = .;
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code : {
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} :code
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STABS_DEBUG
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DWARF_DEBUG
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/* Default discards */
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DISCARDS
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}
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