linux-kernel - [PATCH v10 08/10] arm64/kasan: use kasan_map

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Message-Id: <20171005211124.26524-9-pasha.tatashin@oracle.com>
Date:   Thu,  5 Oct 2017 17:11:22 -0400
From:   Pavel Tatashin <pasha.tatashin@...cle.com>
To:     linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        x86@...nel.org, kasan-dev@...glegroups.com, borntraeger@...ibm.com,
        heiko.carstens@...ibm.com, davem@...emloft.net,
        willy@...radead.org, mhocko@...nel.org, ard.biesheuvel@...aro.org,
        mark.rutland@....com, will.deacon@....com, catalin.marinas@....com,
        sam@...nborg.org, mgorman@...hsingularity.net,
        steven.sistare@...cle.com, daniel.m.jordan@...cle.com,
        bob.picco@...cle.com
Subject: [PATCH v10 08/10] arm64/kasan: use kasan_map_populate()

To optimize the performance of struct page initialization,
vmemmap_populate() will no longer zero memory.

Therefore, we must use a new interface to allocate and map kasan shadow
memory, that also zeroes memory for us.

Signed-off-by: Pavel Tatashin <pasha.tatashin@...cle.com>
---
 arch/arm64/mm/kasan_init.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c
index 81f03959a4ab..b6e92cfa3ea3 100644
--- a/arch/arm64/mm/kasan_init.c
+++ b/arch/arm64/mm/kasan_init.c
@@ -161,11 +161,11 @@ void __init kasan_init(void)
 
 	clear_pgds(KASAN_SHADOW_START, KASAN_SHADOW_END);
 
-	vmemmap_populate(kimg_shadow_start, kimg_shadow_end,
-			 pfn_to_nid(virt_to_pfn(lm_alias(_text))));
+	kasan_map_populate(kimg_shadow_start, kimg_shadow_end,
+			   pfn_to_nid(virt_to_pfn(lm_alias(_text))));
 
 	/*
-	 * vmemmap_populate() has populated the shadow region that covers the
+	 * kasan_map_populate() has populated the shadow region that covers the
 	 * kernel image with SWAPPER_BLOCK_SIZE mappings, so we have to round
 	 * the start and end addresses to SWAPPER_BLOCK_SIZE as well, to prevent
 	 * kasan_populate_zero_shadow() from replacing the page table entries
@@ -191,9 +191,9 @@ void __init kasan_init(void)
 		if (start >= end)
 			break;
 
-		vmemmap_populate((unsigned long)kasan_mem_to_shadow(start),
-				(unsigned long)kasan_mem_to_shadow(end),
-				pfn_to_nid(virt_to_pfn(start)));
+		kasan_map_populate((unsigned long)kasan_mem_to_shadow(start),
+				   (unsigned long)kasan_mem_to_shadow(end),
+				   pfn_to_nid(virt_to_pfn(start)));
 	}
 
 	/*
-- 
2.14.2