Len Brown a9bcaa02a5 x86/smpboot: Remove SIPI delays from cpu_up() ... MPS 1.4 example code shows the following required delays during processor on-lining: INIT udelay(10,000) SIPI udelay(200) SIPI udelay(200) /* Linux actually implements this as udelay(300) */ Linux skips the udelay(10,000) on modern processors. This patch removes the udelay(200) after each SIPI on those same processors. All three legacy delays can be restored by the cmdline "cpu_init_udelay=10000". As measured by analyze_suspend.py, this patch speeds processor resume time on my desktop from 2.4ms to 1.8ms, per AP. Signed-off-by: Len Brown <len.brown@intel.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Igor Mammedov <imammedo@redhat.com> Cc: Jan H. Schönherr <jschoenh@amazon.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Zhu Guihua <zhugh.fnst@cn.fujitsu.com> Link: http://lkml.kernel.org/r/a5dfdbc8fbfdd813784da204aad5677fe459ac37.1439739165.git.len.brown@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>		2015-08-17 10:42:27 +02:00
..
alpha	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
arc	ARCv2: spinlock/rwlock/atomics: reduce 1 instruction in exponential backoff	2015-08-07 13:56:16 +05:30
arm	ARM: SoC fixes	2015-08-16 15:44:33 -07:00
arm64	arm64: VDSO: fix coarse clock monotonicity regression	2015-08-10 15:37:45 +01:00
avr32	avr32: handle NULL as a valid clock object	2015-07-27 09:14:07 +02:00
blackfin	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
c6x	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
cris	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
frv	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
h8300	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
hexagon	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
ia64	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
m32r	m32r: Add ioreadXX/iowriteXX big-endian mmio accessors	2015-07-23 18:08:28 -07:00
m68k	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
metag	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
microblaze	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
mips	MIPS: Fix seccomp syscall argument for MIPS64	2015-08-16 15:00:59 +02:00
mn10300	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
nios2	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
openrisc	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
parisc	parisc: mm: Fix a memory leak related to pmd not attached to the pgd	2015-07-19 08:56:14 +02:00
powerpc	signal: fix information leak in copy_siginfo_from_user32	2015-08-07 04:39:40 +03:00
s390	Just two very small & simple patches.	2015-08-05 18:50:38 +03:00
score	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
sh	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
sparc	sparc64: Fix userspace FPU register corruptions.	2015-08-06 19:13:25 -07:00
tile	signal: fix information leak in copy_siginfo_from_user32	2015-08-07 04:39:40 +03:00
um	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
unicore32	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
x86	x86/smpboot: Remove SIPI delays from cpu_up()	2015-08-17 10:42:27 +02:00
xtensa	mm: clean up per architecture MM hook header files	2015-07-17 16:39:53 -07:00
.gitignore
Kconfig	x86/fpu, sched: Introduce CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT and use it on x86	2015-07-18 03:42:51 +02:00