linux-kernel - [PATCH 09/11] Don't need to map the shadow of KASan's shadow memory

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Date:   Wed, 11 Oct 2017 16:22:25 +0800
From:   Abbott Liu <liuwenliang@...wei.com>
To:     <linux@...linux.org.uk>, <aryabinin@...tuozzo.com>,
        <liuwenliang@...wei.com>, <afzal.mohd.ma@...il.com>,
        <f.fainelli@...il.com>, <labbott@...hat.com>,
        <kirill.shutemov@...ux.intel.com>, <mhocko@...e.com>,
        <cdall@...aro.org>, <marc.zyngier@....com>,
        <catalin.marinas@....com>, <akpm@...ux-foundation.org>,
        <mawilcox@...rosoft.com>, <tglx@...utronix.de>,
        <thgarnie@...gle.com>, <keescook@...omium.org>, <arnd@...db.de>,
        <vladimir.murzin@....com>, <tixy@...aro.org>,
        <ard.biesheuvel@...aro.org>, <robin.murphy@....com>,
        <mingo@...nel.org>, <grygorii.strashko@...aro.org>
CC:     <glider@...gle.com>, <dvyukov@...gle.com>, <opendmb@...il.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <kasan-dev@...glegroups.com>,
        <linux-mm@...ck.org>, <jiazhenghua@...wei.com>,
        <dylix.dailei@...wei.com>, <zengweilin@...wei.com>,
        <heshaoliang@...wei.com>
Subject: [PATCH 09/11] Don't need to map the shadow of KASan's shadow memory

 Because the KASan's shadow memory don't need to track,so remove the
 mapping code in kasan_init.

Cc: Andrey Ryabinin <a.ryabinin@...sung.com>
---
 arch/arm/mm/kasan_init.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/arch/arm/mm/kasan_init.c b/arch/arm/mm/kasan_init.c
index 2bf0782..7cfdc39 100644
--- a/arch/arm/mm/kasan_init.c
+++ b/arch/arm/mm/kasan_init.c
@@ -218,10 +218,6 @@ void __init kasan_init(void)
 
 	clear_pgds(KASAN_SHADOW_START, KASAN_SHADOW_END);
 
-	kasan_populate_zero_shadow(
-		kasan_mem_to_shadow((void *)KASAN_SHADOW_START),
-		kasan_mem_to_shadow((void *)KASAN_SHADOW_END));
-
 	kasan_populate_zero_shadow(kasan_mem_to_shadow((void *)VMALLOC_START),
 				kasan_mem_to_shadow((void *)-1UL) + 1);
 
-- 
2.9.0