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3 Commits (95db3a60e0652a52df145aacade1a88c5acef659)

Author SHA1 Message Date
Martin Schwidefsky 050eef364a [S390] fix tlb flushing vs. concurrent /proc accesses 
The tlb flushing code uses the mm_users field of the mm_struct to
decide if each page table entry needs to be flushed individually with
IPTE or if a global flush for the mm_struct is sufficient after all page
table updates have been done. The comment for mm_users says "How many
users with user space?" but the /proc code increases mm_users after it
found the process structure by pid without creating a new user process.
Which makes mm_users useless for the decision between the two tlb
flusing methods. The current code can be confused to not flush tlb
entries by a concurrent access to /proc files if e.g. a fork is in
progres. The solution for this problem is to make the tlb flushing
logic independent from the mm_users field.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
 2010-08-24 09:26:34 +02:00
Rusty Russell 005f8eee6f [S390] cpumask: use mm_cpumask() wrapper 
Makes code futureproof against the impending change to mm->cpu_vm_mask.

It's also a chance to use the new cpumask_ ops which take a pointer
(the older ones are deprecated, but there's no hurry for arch code).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
 2009-03-26 15:24:34 +01:00
Martin Schwidefsky c6557e7f2b [S390] move include/asm-s390 to arch/s390/include/asm 
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
 2008-08-01 20:42:05 +02:00