From: <miles.chen@mediatek.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>
Cc: <linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <srv_wsdupstream@mediatek.com>,
<linux-mediatek@lists.infradead.org>,
Miles Chen <miles.chen@mediatek.com>
Subject: [PATCH] arm64/mm: remove unnecessary boundary check
Date: Thu, 25 Feb 2016 11:44:34 +0800 [thread overview]
Message-ID: <1456371874-19826-1-git-send-email-miles.chen@mediatek.com> (raw)
From: Miles Chen <miles.chen@mediatek.com>
Remove the unnecessary boundary check since there is a huge
gap between user and kernel address that they would never overlap.
(arm64 does not have enough levels of page tables to cover 64-bit
virtual address)
See Documentation/arm64/memory.txt
Signed-off-by: Miles Chen <miles.chen@mediatek.com>
---
arch/arm64/mm/init.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index f3b061e..4579604 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -343,8 +343,6 @@ void __init mem_init(void)
#ifdef CONFIG_COMPAT
BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
#endif
- BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
- BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
extern int sysctl_overcommit_memory;
--
1.9.1
next reply other threads:[~2016-02-25 3:44 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-25 3:44 miles.chen [this message]
2016-02-26 9:47 ` [PATCH] arm64/mm: remove unnecessary boundary check Will Deacon
2016-02-26 13:40 ` Catalin Marinas
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