When a user page mapping is released via kunmap*() functions, the D-cache needs
to be flushed via flush_dcache_page() to avoid D-cache aliasing issues.
This patch fixes aio on the parisc platform (and probably others).
Signed-off-by: Helge Deller <deller@xxxxxx>
To: Benjamin LaHaise <bcrl@xxxxxxxxx>
To: linux-aio@xxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx # 3.12+
diff --git a/fs/aio.c b/fs/aio.c
index 823efcb..2181821 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -514,6 +514,7 @@ static void free_ioctx(struct work_struct *work)
atomic_add(avail, &ctx->reqs_available);
ring->head = ring->tail;
kunmap_atomic(ring);
+ flush_dcache_page(ctx->ring_pages[0]);
if (atomic_read(&ctx->reqs_available) >= ctx->nr_events - 1)
break;
@@ -568,6 +569,7 @@ static int ioctx_add_table(struct kioctx *ctx, struct mm_struct *mm)
ring = kmap_atomic(ctx->ring_pages[0]);
ring->id = ctx->id;
kunmap_atomic(ring);
+ flush_dcache_page(ctx->ring_pages[0]);
return 0;
}
@@ -1032,6 +1034,7 @@ static long aio_read_events_ring(struct kioctx *ctx,
head = ring->head;
tail = ring->tail;
kunmap_atomic(ring);
+ flush_dcache_page(ctx->ring_pages[0]);
pr_debug("h%u t%u m%u\n", head, tail, ctx->nr_events);
--
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