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Subject[PATCH 2/3] x86:add missing CONFIG_STRICT_KERNEL_RWX for mark_rodata_ro
Date
mark_rodata_ro is only called by the function mark_readonly
when CONFIG_STRICT_KERNEL_RWX=y

if CONFIG_STRICT_KERNEL_RWX is not set
a compile warning may be triggered: unused function

Signed-off-by: nixiaoming <nixiaoming@huawei.com>
---
arch/x86/mm/init_32.c | 2 ++
arch/x86/mm/init_64.c | 2 ++
2 files changed, 4 insertions(+)

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index c893c6a..121c567 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -920,6 +920,7 @@ static void mark_nxdata_nx(void)
set_pages_nx(virt_to_page(start), size >> PAGE_SHIFT);
}

+#ifdef CONFIG_STRICT_KERNEL_RWX
void mark_rodata_ro(void)
{
unsigned long start = PFN_ALIGN(_text);
@@ -957,3 +958,4 @@ void mark_rodata_ro(void)
if (__supported_pte_mask & _PAGE_NX)
debug_checkwx();
}
+#endif /*end of CONFIG_STRICT_KERNEL_RWX*/
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 0a40060..1b7a1a7 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1245,6 +1245,7 @@ void set_kernel_text_ro(void)
set_memory_ro(start, (end - start) >> PAGE_SHIFT);
}

+#ifdef CONFIG_STRICT_KERNEL_RWX
void mark_rodata_ro(void)
{
unsigned long start = PFN_ALIGN(_text);
@@ -1298,6 +1299,7 @@ void mark_rodata_ro(void)
*/
pti_clone_kernel_text();
}
+#endif

int kern_addr_valid(unsigned long addr)
{
--
2.10.1
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