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>

3 files changed, 4 insertions, 4 deletions

diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index 70f073d6c3b2..2ff2b8a19f71 100644
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -224,7 +224,7 @@ void __init allocate_pacas(void)
         paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit));
         memset(paca, 0, paca_size);
 
-        printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n",
+        printk(KERN_DEBUG "Allocated %u bytes for %u pacas at %p\n",
                 paca_size, nr_cpu_ids, paca);
 
         allocate_lppacas(nr_cpu_ids, limit);
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index 7de73589d8e2..0ac741fae90e 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -551,7 +551,7 @@ void __init smp_setup_cpu_maps(void)
                 if (maxcpus > nr_cpu_ids) {
                         printk(KERN_WARNING
                                "Partition configured for %d cpus, "
-                               "operating system maximum is %d.\n",
+                               "operating system maximum is %u.\n",
                                maxcpus, nr_cpu_ids);
                         maxcpus = nr_cpu_ids;
                 } else
diff --git a/arch/powerpc/sysdev/xive/native.c b/arch/powerpc/sysdev/xive/native.c
index 44f3a25ca630..ebc244b08d67 100644
--- a/arch/powerpc/sysdev/xive/native.c
+++ b/arch/powerpc/sysdev/xive/native.c
@@ -511,13 +511,13 @@ static bool xive_parse_provisioning(struct device_node *np)
 static void xive_native_setup_pools(void)
 {
         /* Allocate a pool big enough */
-        pr_debug("XIVE: Allocating VP block for pool size %d\n", nr_cpu_ids);
+        pr_debug("XIVE: Allocating VP block for pool size %u\n", nr_cpu_ids);
 
         xive_pool_vps = xive_native_alloc_vp_block(nr_cpu_ids);
         if (WARN_ON(xive_pool_vps == XIVE_INVALID_VP))
                 pr_err("XIVE: Failed to allocate pool VP, KVM might not function\n");
 
-        pr_debug("XIVE: Pool VPs allocated at 0x%x for %d max CPUs\n",
+        pr_debug("XIVE: Pool VPs allocated at 0x%x for %u max CPUs\n",
                  xive_pool_vps, nr_cpu_ids);
 }