linux-kernel - [PATCH v3 4/6] openrisc: simplify pte_alloc_one

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Date:   Sun,  9 Dec 2018 17:00:22 +0200
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        "David S. Miller" <davem@...emloft.net>,
        Guan Xuetao <gxt@....edu.cn>,
        Greentime Hu <green.hu@...il.com>,
        Jonas Bonn <jonas@...thpole.se>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Hocko <mhocko@...e.com>,
        Michal Simek <monstr@...str.eu>,
        Mark Salter <msalter@...hat.com>,
        Paul Mackerras <paulus@...ba.org>,
        Rich Felker <dalias@...c.org>,
        Russell King <linux@...linux.org.uk>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Stafford Horne <shorne@...il.com>,
        Vincent Chen <deanbo422@...il.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        linux-arm-kernel@...ts.infradead.org, linux-c6x-dev@...ux-c6x.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-sh@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        openrisc@...ts.librecores.org, sparclinux@...r.kernel.org,
        Mike Rapoport <rppt@...ux.ibm.com>
Subject: [PATCH v3 4/6] openrisc: simplify pte_alloc_one_kernel()

The pte_alloc_one_kernel() function allocates a page using
__get_free_page(GFP_KERNEL) when mm initialization is complete and
memblock_phys_alloc() on the earlier stages. The physical address of the
page allocated with memblock_phys_alloc() is converted to the virtual
address and in the both cases the allocated page is cleared using
clear_page().

The code is simplified by replacing __get_free_page() with
get_zeroed_page() and by replacing memblock_phys_alloc() with
memblock_alloc().

Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
Acked-by: Stafford Horne <shorne@...il.com>
---
 arch/openrisc/mm/ioremap.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/arch/openrisc/mm/ioremap.c b/arch/openrisc/mm/ioremap.c
index c969752..cfef989 100644
--- a/arch/openrisc/mm/ioremap.c
+++ b/arch/openrisc/mm/ioremap.c
@@ -123,13 +123,10 @@ pte_t __ref *pte_alloc_one_kernel(struct mm_struct *mm,
 {
 	pte_t *pte;
 
-	if (likely(mem_init_done)) {
-		pte = (pte_t *) __get_free_page(GFP_KERNEL);
-	} else {
-		pte = (pte_t *) __va(memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE));
-	}
+	if (likely(mem_init_done))
+		pte = (pte_t *)get_zeroed_page(GFP_KERNEL);
+	else
+		pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
 
-	if (pte)
-		clear_page(pte);
 	return pte;
 }
-- 
2.7.4