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author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2010-08-24 11:26:21 +0400 |
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committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2010-08-24 11:26:34 +0400 |
commit | 050eef364ad700590a605a0749f825cab4834b1e (patch) | |
tree | 2714c9cf7edcbf394971cc2c929e5ab2ea34d6a6 /crypto/md5.c | |
parent | 7af048dc7639db5202c56fecf2346c310647a218 (diff) | |
download | linux-050eef364ad700590a605a0749f825cab4834b1e.tar.xz |
[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>
Diffstat (limited to 'crypto/md5.c')
0 files changed, 0 insertions, 0 deletions