This is a note to let you know that I've just added the patch titled
MIPS: Fixed __debug_virt_addr_valid()
to the 5.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mips-fixed-__debug_virt_addr_valid.patch
and it can be found in the queue-5.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5be07555987c9713086d22801b863791b1a5aa3a
Author: Florian Fainelli <f.fainelli@xxxxxxxxx>
Date: Thu Jul 14 15:25:12 2022 -0700
MIPS: Fixed __debug_virt_addr_valid()
[ Upstream commit 8a2b456665d1e797123669581524cbb095fb003b ]
It is permissible for kernel code to call virt_to_phys() against virtual
addresses that are in KSEG0 or KSEG1 and we need to be dealing with both
types. Rewrite the test condition to ensure that the kernel virtual
addresses are above PAGE_OFFSET which they must be, and below KSEG2
where the non-linear mapping starts.
For EVA, there is not much that we can do given the linear address range
that is offered, so just return any virtual address as being valid.
Finally, when HIGHMEM is not enabled, all virtual addresses are assumed
to be valid as well.
Fixes: dfad83cb7193 ("MIPS: Add support for CONFIG_DEBUG_VIRTUAL")
Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
Reviewed-by: Serge Semin <fancer.lancer@xxxxxxxxx>
Signed-off-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/mips/mm/physaddr.c b/arch/mips/mm/physaddr.c
index a1ced5e44951..f9b8c85e9843 100644
--- a/arch/mips/mm/physaddr.c
+++ b/arch/mips/mm/physaddr.c
@@ -5,6 +5,7 @@
#include <linux/mmdebug.h>
#include <linux/mm.h>
+#include <asm/addrspace.h>
#include <asm/sections.h>
#include <asm/io.h>
#include <asm/page.h>
@@ -12,15 +13,6 @@
static inline bool __debug_virt_addr_valid(unsigned long x)
{
- /* high_memory does not get immediately defined, and there
- * are early callers of __pa() against PAGE_OFFSET
- */
- if (!high_memory && x >= PAGE_OFFSET)
- return true;
-
- if (high_memory && x >= PAGE_OFFSET && x < (unsigned long)high_memory)
- return true;
-
/*
* MAX_DMA_ADDRESS is a virtual address that may not correspond to an
* actual physical address. Enough code relies on
@@ -30,7 +22,9 @@ static inline bool __debug_virt_addr_valid(unsigned long x)
if (x == MAX_DMA_ADDRESS)
return true;
- return false;
+ return x >= PAGE_OFFSET && (KSEGX(x) < KSEG2 ||
+ IS_ENABLED(CONFIG_EVA) ||
+ !IS_ENABLED(CONFIG_HIGHMEM));
}
phys_addr_t __virt_to_phys(volatile const void *x)
