linux-kernel - [PATCH 1/2] kfence: allow providing __kfence

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Date:   Mon, 24 May 2021 17:25:29 +0800
From:   Jisheng Zhang <Jisheng.Zhang@...aptics.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, linux-mm@...ck.org
Subject: [PATCH 1/2] kfence: allow providing __kfence_pool in arch specific
 way

Some architectures may want to allocate the __kfence_pool differently
for example, allocate the __kfence_pool earlier before paging_init().
We also delay the memset() to kfence_init_pool().

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com>
---
 mm/kfence/core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/mm/kfence/core.c b/mm/kfence/core.c
index e18fbbd5d9b4..65f0210edb65 100644
--- a/mm/kfence/core.c
+++ b/mm/kfence/core.c
@@ -430,6 +430,8 @@ static bool __init kfence_init_pool(void)
 	if (!__kfence_pool)
 		return false;
 
+	memset(__kfence_pool, 0, KFENCE_POOL_SIZE);
+
 	if (!arch_kfence_init_pool())
 		goto err;
 
@@ -645,10 +647,10 @@ static DECLARE_DELAYED_WORK(kfence_timer, toggle_allocation_gate);
 
 void __init kfence_alloc_pool(void)
 {
-	if (!kfence_sample_interval)
+	if (!kfence_sample_interval || __kfence_pool)
 		return;
 
-	__kfence_pool = memblock_alloc(KFENCE_POOL_SIZE, PAGE_SIZE);
+	__kfence_pool = memblock_alloc_raw(KFENCE_POOL_SIZE, PAGE_SIZE);
 
 	if (!__kfence_pool)
 		pr_err("failed to allocate pool\n");
-- 
2.31.0