From: Zong Li <zong.li@sifive.com>
To: paul.walmsley@sifive.com, palmer@dabbelt.com,
aou@eecs.berkeley.edu, linux-riscv@lists.infradead.org,
linux-kernel@vger.kernel.org
Cc: Zong Li <zong.li@sifive.com>
Subject: [PATCH 3/8] riscv: add ARCH_SUPPORTS_DEBUG_PAGEALLOC support
Date: Mon, 17 Feb 2020 16:32:18 +0800 [thread overview]
Message-ID: <20200217083223.2011-4-zong.li@sifive.com> (raw)
In-Reply-To: <20200217083223.2011-1-zong.li@sifive.com>
ARCH_SUPPORTS_DEBUG_PAGEALLOC provides a hook to map and unmap
pages for debugging purposes. Implement the __kernel_map_pages
functions to fill the poison pattern.
Signed-off-by: Zong Li <zong.li@sifive.com>
---
arch/riscv/Kconfig | 3 +++
arch/riscv/mm/pageattr.c | 13 +++++++++++++
2 files changed, 16 insertions(+)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 07bf1a7c0dd2..f524d7e60648 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -132,6 +132,9 @@ config ARCH_SELECT_MEMORY_MODEL
config ARCH_WANT_GENERAL_HUGETLB
def_bool y
+config ARCH_SUPPORTS_DEBUG_PAGEALLOC
+ def_bool y
+
config SYS_SUPPORTS_HUGETLBFS
def_bool y
diff --git a/arch/riscv/mm/pageattr.c b/arch/riscv/mm/pageattr.c
index 7be6cd67e2ef..728759eb530a 100644
--- a/arch/riscv/mm/pageattr.c
+++ b/arch/riscv/mm/pageattr.c
@@ -172,3 +172,16 @@ int set_direct_map_default_noflush(struct page *page)
return walk_page_range(&init_mm, start, end, &pageattr_ops, &masks);
}
+
+void __kernel_map_pages(struct page *page, int numpages, int enable)
+{
+ if (!debug_pagealloc_enabled())
+ return;
+
+ if (enable)
+ __set_memory((unsigned long)page_address(page), numpages,
+ __pgprot(_PAGE_PRESENT), __pgprot(0));
+ else
+ __set_memory((unsigned long)page_address(page), numpages,
+ __pgprot(0), __pgprot(_PAGE_PRESENT));
+}
--
2.25.0
next prev parent reply other threads:[~2020-02-17 8:33 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-17 8:32 [PATCH 0/8] Support strict kernel memory permissions for security Zong Li
2020-02-17 8:32 ` [PATCH 1/8] riscv: add ARCH_HAS_SET_MEMORY support Zong Li
2020-03-05 0:57 ` Palmer Dabbelt
2020-02-17 8:32 ` [PATCH 2/8] riscv: add ARCH_HAS_SET_DIRECT_MAP support Zong Li
2020-03-05 0:57 ` Palmer Dabbelt
2020-02-17 8:32 ` Zong Li [this message]
2020-03-05 0:57 ` [PATCH 3/8] riscv: add ARCH_SUPPORTS_DEBUG_PAGEALLOC support Palmer Dabbelt
2020-02-17 8:32 ` [PATCH 4/8] riscv: move exception table immediately after RO_DATA Zong Li
2020-03-05 0:57 ` Palmer Dabbelt
2020-03-05 4:01 ` Zong Li
2020-02-17 8:32 ` [PATCH 5/8] riscv: add alignment for text, rodata and data sections Zong Li
2020-03-05 0:58 ` Palmer Dabbelt
2020-02-17 8:32 ` [PATCH 6/8] riscv: add STRICT_KERNEL_RWX support Zong Li
2020-03-05 1:21 ` Palmer Dabbelt
2020-03-05 4:08 ` Zong Li
2020-02-17 8:32 ` [PATCH 7/8] riscv: add DEBUG_WX support Zong Li
2020-03-05 1:44 ` Palmer Dabbelt
2020-03-05 5:53 ` Zong Li
2020-02-17 8:32 ` [PATCH 8/8] riscv: add two hook functions of ftrace Zong Li
2020-03-05 1:44 ` Palmer Dabbelt
2020-03-05 4:27 ` Zong Li
2020-03-05 15:55 ` [PATCH 0/8] Support strict kernel memory permissions for security Palmer Dabbelt
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