Current __virt_to_phys() only print warning messages for non-linear
addresses. It's hard to catch all warnings by those messages. So add a
VIRTUAL_BUG_ON() to trap all non-linear and non-symbol addresses
(e.g., stack addresses)
Tested by pass stack addresses and symbol addresses to __pa(). Result:
stack addresses: kernel BUG()
symbol addresses: kernel warning message
Maybe we should trap all non-linear address translations in the future.
Signed-off-by: Miles Chen <miles.c...@mediatek.com>
---
arch/arm64/mm/physaddr.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/arm64/mm/physaddr.c b/arch/arm64/mm/physaddr.c
index 67a9ba9eaa96..f6b935dad19c 100644
--- a/arch/arm64/mm/physaddr.c
+++ b/arch/arm64/mm/physaddr.c
@@ -14,6 +14,11 @@ phys_addr_t __virt_to_phys(unsigned long x)
(void *)x,
(void *)x);
+ /* trap all non-linear and non-symbol addresses */
+ VIRTUAL_BUG_ON(!__is_lm_address(x) &&
+ (x < (unsigned long)KERNEL_START ||
+ x > (unsigned long)KERNEL_END));
+
return __virt_to_phys_nodebug(x);
}
EXPORT_SYMBOL(__virt_to_phys);
--
2.18.0
