linux_dsm_epyc7002/arch/c6x/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

159 lines
2.4 KiB
ArmAsm

/*
* ld script for the c6x kernel
*
* Copyright (C) 2010, 2011 Texas Instruments Incorporated
* Mark Salter <msalter@redhat.com>
*/
#include <asm-generic/vmlinux.lds.h>
#include <asm/thread_info.h>
#include <asm/page.h>
ENTRY(_c_int00)
#if defined(CONFIG_CPU_BIG_ENDIAN)
jiffies = jiffies_64 + 4;
#else
jiffies = jiffies_64;
#endif
#define READONLY_SEGMENT_START \
. = PAGE_OFFSET;
#define READWRITE_SEGMENT_START \
. = ALIGN(128); \
_data_lma = .;
SECTIONS
{
/*
* Start kernel read only segment
*/
READONLY_SEGMENT_START
.vectors :
{
_vectors_start = .;
*(.vectors)
. = ALIGN(0x400);
_vectors_end = .;
}
/*
* This section contains data which may be shared with other
* cores. It needs to be a fixed offset from PAGE_OFFSET
* regardless of kernel configuration.
*/
.virtio_ipc_dev :
{
*(.virtio_ipc_dev)
}
. = ALIGN(PAGE_SIZE);
__init_begin = .;
.init :
{
_sinittext = .;
HEAD_TEXT
INIT_TEXT
_einittext = .;
}
INIT_DATA_SECTION(16)
PERCPU_SECTION(128)
. = ALIGN(PAGE_SIZE);
__init_end = .;
.text :
{
_text = .;
_stext = .;
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
IRQENTRY_TEXT
SOFTIRQENTRY_TEXT
KPROBES_TEXT
*(.fixup)
*(.gnu.warning)
}
EXCEPTION_TABLE(16)
NOTES
RO_DATA_SECTION(PAGE_SIZE)
.const :
{
*(.const .const.* .gnu.linkonce.r.*)
*(.switch)
}
. = ALIGN (8) ;
__fdt_blob : AT(ADDR(__fdt_blob) - LOAD_OFFSET)
{
_fdt_start = . ; /* place for fdt blob */
*(__fdt_blob) ; /* Any link-placed DTB */
BYTE(0); /* section always has contents */
. = _fdt_start + 0x4000; /* Pad up to 16kbyte */
_fdt_end = . ;
}
_etext = .;
/*
* Start kernel read-write segment.
*/
READWRITE_SEGMENT_START
_sdata = .;
.fardata : AT(ADDR(.fardata) - LOAD_OFFSET)
{
INIT_TASK_DATA(THREAD_SIZE)
NOSAVE_DATA
PAGE_ALIGNED_DATA(PAGE_SIZE)
CACHELINE_ALIGNED_DATA(128)
READ_MOSTLY_DATA(128)
DATA_DATA
CONSTRUCTORS
*(.data1)
*(.fardata .fardata.*)
*(.data.debug_bpt)
}
.neardata ALIGN(8) : AT(ADDR(.neardata) - LOAD_OFFSET)
{
*(.neardata2 .neardata2.* .gnu.linkonce.s2.*)
*(.neardata .neardata.* .gnu.linkonce.s.*)
. = ALIGN(8);
}
_edata = .;
__bss_start = .;
SBSS(8)
BSS(8)
.far :
{
. = ALIGN(8);
*(.dynfar)
*(.far .far.* .gnu.linkonce.b.*)
. = ALIGN(8);
}
__bss_stop = .;
_end = .;
DWARF_DEBUG
/DISCARD/ :
{
EXIT_TEXT
EXIT_DATA
EXIT_CALL
*(.discard)
*(.discard.*)
*(.interp)
}
}