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MIPS: Fixed __debug_virt_addr_valid()

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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: dfad83cb71 ("MIPS: Add support for CONFIG_DEBUG_VIRTUAL")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Florian Fainelli 2022-07-14 15:25:12 -07:00 committed by Thomas Bogendoerfer
parent c022e87162
commit 8a2b456665
1 changed files with 4 additions and 10 deletions
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14
arch/mips/mm/physaddr.c
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@ -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)