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| author | Pavel Tatashin <pasha.tatashin@oracle.com> | 2017-05-31 18:25:20 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-06-06 23:45:28 +0300 |
| commit | 588974857359861891f478a070b1dc7ae04a3880 (patch) | |
| tree | 179dd8a5d88a0b14a199891aff7f562ad71fc317 /arch | |
| parent | f322980b74a15e08f8c70a34a5864ecdbf957251 (diff) | |
| download | linux-588974857359861891f478a070b1dc7ae04a3880.tar.xz | |
sparc64: reset mm cpumask after wrap
After a wrap (getting a new context version) a process must get a new
context id, which means that we would need to flush the context id from
the TLB before running for the first time with this ID on every CPU. But,
we use mm_cpumask to determine if this process has been running on this CPU
before, and this mask is not reset after a wrap. So, there are two possible
fixes for this issue:
1. Clear mm cpumask whenever mm gets a new context id
2. Unconditionally flush context every time process is running on a CPU
This patch implements the first solution
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: Bob Picco <bob.picco@oracle.com>
Reviewed-by: Steven Sistare <steven.sistare@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc/mm/init_64.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index 7ca1b9dc7d64..f8e30a3906be 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -759,6 +759,8 @@ void get_new_mmu_context(struct mm_struct *mm) goto out; } } + if (mm->context.sparc64_ctx_val) + cpumask_clear(mm_cpumask(mm)); mmu_context_bmap[new_ctx>>6] |= (1UL << (new_ctx & 63)); new_ctx |= (tlb_context_cache & CTX_VERSION_MASK); out: |