lkml.org 
[lkml]   [2013]   [Nov]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH] aio: fix D-cache aliasing issues
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@gmx.de>
To: Benjamin LaHaise <bcrl@kvack.org>
To: linux-aio@kvack.org
Cc: stable@vger.kernel.org # 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);



\
 
 \ /
  Last update: 2013-11-15 23:41    [W:0.065 / U:0.516 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site