linux/arch/powerpc
Alexey Dobriyan 9b130ad5bb treewide: make "nr_cpu_ids" unsigned
First, number of CPUs can't be negative number.

Second, different signnnedness leads to suboptimal code in the following
cases:

1)
	kmalloc(nr_cpu_ids * sizeof(X));

"int" has to be sign extended to size_t.

2)
	while (loff_t *pos < nr_cpu_ids)

MOVSXD is 1 byte longed than the same MOV.

Other cases exist as well. Basically compiler is told that nr_cpu_ids
can't be negative which can't be deduced if it is "int".

Code savings on allyesconfig kernel: -3KB

	add/remove: 0/0 grow/shrink: 25/264 up/down: 261/-3631 (-3370)
	function                                     old     new   delta
	coretemp_cpu_online                          450     512     +62
	rcu_init_one                                1234    1272     +38
	pci_device_probe                             374     399     +25

				...

	pgdat_reclaimable_pages                      628     556     -72
	select_fallback_rq                           446     369     -77
	task_numa_find_cpu                          1923    1807    -116

Link: http://lkml.kernel.org/r/20170819114959.GA30580@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-09-08 18:26:48 -07:00
..
boot powerpc: conditionally compile platform-specific serial drivers 2017-08-31 14:26:48 +10:00
configs powerpc/configs: Enable THP and 64K for ppc64(le)_defconfig 2017-08-31 14:26:47 +10:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2017-05-02 15:53:46 -07:00
include vga: optimise console scrolling 2017-09-08 18:26:48 -07:00
kernel treewide: make "nr_cpu_ids" unsigned 2017-09-08 18:26:48 -07:00
kvm powerpc updates for 4.14 2017-09-07 10:15:40 -07:00
lib powerpc: Fix kernel crash in emulation of vector loads and stores 2017-09-04 19:38:07 +10:00
math-emu
mm powerpc/mm: Use seq_putc() in two functions 2017-09-01 16:42:52 +10:00
net powerpc updates for 4.14 2017-09-07 10:15:40 -07:00
oprofile
perf powerpc updates for 4.14 2017-09-07 10:15:40 -07:00
platforms powerpc updates for 4.14 2017-09-07 10:15:40 -07:00
purgatory powerpc/asm: Convert .llong directives to .8byte 2017-08-31 14:26:47 +10:00
sysdev treewide: make "nr_cpu_ids" unsigned 2017-09-08 18:26:48 -07:00
tools powerpc/64: Tool to check head sections location sanity 2017-05-30 14:59:51 +10:00
xmon powerpc/xmon: Add ISA v3.0 SPRs to SPR dump 2017-08-31 14:26:45 +10:00
Kconfig powerpc updates for 4.14 2017-09-07 10:15:40 -07:00
Kconfig.debug
Makefile Merge branch 'fixes' into next 2017-08-23 22:20:10 +10:00
Makefile.postlink powerpc/64: Tool to check head sections location sanity 2017-05-30 14:59:51 +10:00