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sparc64: kern_addr_valid regression

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I encountered this bug when using /proc/kcore to examine the kernel. Plus a
coworker inquired about debugging tools. We computed pa but did
not use it during the maximum physical address bits test. Instead we used
the identity mapped virtual address which will always fail this test.

I believe the defect came in here:
[bpicco@zareason linus.git]$ git describe --contains bb4e6e85da
v3.18-rc1~87^2~4
.

Signed-off-by: Bob Picco <bob.picco@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
bob picco 2017-03-10 14:31:19 -05:00 committed by David S. Miller
parent 85b1da7c47
commit adfae8a5d8
1 changed files with 1 additions and 1 deletions
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2
arch/sparc/mm/init_64.c
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@ -1567,7 +1567,7 @@ bool kern_addr_valid(unsigned long addr)
if ((long)addr < 0L) {
unsigned long pa = __pa(addr);
if ((addr >> max_phys_bits) != 0UL)
if ((pa >> max_phys_bits) != 0UL)
return false;
return pfn_valid(pa >> PAGE_SHIFT);