linux-kernel - [PATCH v2 1/5] powerpc: mm: Simplify page_is_ram by using memblock_is

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Date:   Wed, 28 Mar 2018 02:25:40 +0200
From:   Jonathan Neuschäfer <j.neuschaefer@....net>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Christophe Leroy <christophe.leroy@....fr>,
        Jonathan Neuschäfer <j.neuschaefer@....net>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Joe Perches <joe@...ches.com>,
        "Oliver O'Halloran" <oohall@...il.com>
Subject: [PATCH v2 1/5] powerpc: mm: Simplify page_is_ram by using memblock_is_memory

Instead of open-coding the search in page_is_ram, call memblock_is_memory.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@....net>
---

v2: no changes
---
 arch/powerpc/mm/mem.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index fe8c61149fb8..da4e1555d61d 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -85,13 +85,7 @@ int page_is_ram(unsigned long pfn)
 #ifndef CONFIG_PPC64	/* XXX for now */
 	return pfn < max_pfn;
 #else
-	unsigned long paddr = (pfn << PAGE_SHIFT);
-	struct memblock_region *reg;
-
-	for_each_memblock(memory, reg)
-		if (paddr >= reg->base && paddr < (reg->base + reg->size))
-			return 1;
-	return 0;
+	return memblock_is_memory(__pfn_to_phys(pfn));
 #endif
 }
 
-- 
2.16.2