linux-kernel - [PATCH 05/10] mm/percpu: Use offset_in

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Date:	Tue, 15 Sep 2015 20:08:01 +0600
From:	Alexander Kuleshov <kuleshovmail@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Michal Hocko <mhocko@...e.com>,
	Johannes Weiner <hannes@...xchg.org>,
	David Rientjes <rientjes@...gle.com>,
	Vladimir Davydov <vdavydov@...allels.com>,
	Tejun Heo <tj@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Alexander Kuleshov <kuleshovmail@...il.com>
Subject: [PATCH 05/10] mm/percpu: Use offset_in_page macro

The <linux/mm.h> provides offset_in_page() macro. Let's use already
predefined macro instead of (addr & ~PAGE_MASK).

Signed-off-by: Alexander Kuleshov <kuleshovmail@...il.com>
---
 mm/percpu.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/mm/percpu.c b/mm/percpu.c
index a63b4d8..8a943b9 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1554,12 +1554,12 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
 	PCPU_SETUP_BUG_ON(ai->nr_groups <= 0);
 #ifdef CONFIG_SMP
 	PCPU_SETUP_BUG_ON(!ai->static_size);
-	PCPU_SETUP_BUG_ON((unsigned long)__per_cpu_start & ~PAGE_MASK);
+	PCPU_SETUP_BUG_ON(offset_in_page(__per_cpu_start));
 #endif
 	PCPU_SETUP_BUG_ON(!base_addr);
-	PCPU_SETUP_BUG_ON((unsigned long)base_addr & ~PAGE_MASK);
+	PCPU_SETUP_BUG_ON(offset_in_page(base_addr));
 	PCPU_SETUP_BUG_ON(ai->unit_size < size_sum);
-	PCPU_SETUP_BUG_ON(ai->unit_size & ~PAGE_MASK);
+	PCPU_SETUP_BUG_ON(offset_in_page(ai->unit_size));
 	PCPU_SETUP_BUG_ON(ai->unit_size < PCPU_MIN_UNIT_SIZE);
 	PCPU_SETUP_BUG_ON(ai->dyn_size < PERCPU_DYNAMIC_EARLY_SIZE);
 	PCPU_SETUP_BUG_ON(pcpu_verify_alloc_info(ai) < 0);
@@ -1806,7 +1806,7 @@ static struct pcpu_alloc_info * __init pcpu_build_alloc_info(
 
 	alloc_size = roundup(min_unit_size, atom_size);
 	upa = alloc_size / min_unit_size;
-	while (alloc_size % upa || ((alloc_size / upa) & ~PAGE_MASK))
+	while (alloc_size % upa || (offset_in_page(alloc_size / upa)))
 		upa--;
 	max_upa = upa;
 
@@ -1838,7 +1838,7 @@ static struct pcpu_alloc_info * __init pcpu_build_alloc_info(
 	for (upa = max_upa; upa; upa--) {
 		int allocs = 0, wasted = 0;
 
-		if (alloc_size % upa || ((alloc_size / upa) & ~PAGE_MASK))
+		if (alloc_size % upa || (offset_in_page(alloc_size / upa)))
 			continue;
 
 		for (group = 0; group < nr_groups; group++) {
-- 
2.5.0

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