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13 June 2022, 11:31:42 UTC
Revision 6e9538917c5f62c1a1598da9b898702800801b98 authored by Sergei Shtylyov on 16 April 2006, 19:27:21 UTC, committed by Ralf Baechle on 31 May 2006, 23:28:30 UTC 
[MIPS] Fix marking buddy of pte global for MIPS32 w/36-bit physical address
 
    
In case of CONFIG_64BIT_PHYS_ADDR, set_pte() and pte_clear() functions
only set _PAGE_GLOBAL bit in the pte_low field of the buddy PTEs,
forgetting to propagate ito to pte_high. Thus, the both pages might not
really be made global for the CPU (since it AND's the G-bit of the
odd / even PTEs together to decide whether they're global or not). Thus,
if only a single page is allocated via vmalloc() or ioremap(), it's not
really global for CPU (and it must be, since this is kernel mapping),
and thus its ASID is compared against the current process' one -- so,
we'll get into trouble sooner or later...  Also, pte_none() will fail
on global pages because _PAGE_GLOBAL bit is set in both pte_low and
pte_high, and pte_val() will return u64 value consisting of those fields
concateneted.
    
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
1 parent 343fdc3
History
Tip revision: 6e9538917c5f62c1a1598da9b898702800801b98 authored by Sergei Shtylyov on 16 April 2006, 19:27:21 UTC
[MIPS] Fix marking buddy of pte global for MIPS32 w/36-bit physical address
Tip revision: 6e95389
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