From: John Hubbard <jhubbard@nvidia.com>
To: LKML <linux-kernel@vger.kernel.org>
Cc: John Hubbard <jhubbard@nvidia.com>,
"David S . Miller" <davem@davemloft.net>,
<sparclinux@vger.kernel.org>
Subject: [PATCH] oradax: convert get_user_pages() --> pin_user_pages()
Date: Sat, 16 May 2020 19:08:29 -0700 [thread overview]
Message-ID: <20200517020829.856731-1-jhubbard@nvidia.com> (raw)
This code was using get_user_pages_fast(), in a "Case 2" scenario
(DMA/RDMA), using the categorization from [1]. That means that it's
time to convert the get_user_pages_fast() + put_page() calls to
pin_user_pages_fast() + unpin_user_pages() calls.
There is some helpful background in [2]: basically, this is a small
part of fixing a long-standing disconnect between pinning pages, and
file systems' use of those pages.
[1] Documentation/core-api/pin_user_pages.rst
[2] "Explicit pinning of user-space pages":
https://lwn.net/Articles/807108/
Cc: David S. Miller <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
---
drivers/sbus/char/oradax.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/drivers/sbus/char/oradax.c b/drivers/sbus/char/oradax.c
index 8af216287a84..21b7cb6e7e70 100644
--- a/drivers/sbus/char/oradax.c
+++ b/drivers/sbus/char/oradax.c
@@ -410,9 +410,7 @@ static void dax_unlock_pages(struct dax_ctx *ctx, int ccb_index, int nelem)
if (p) {
dax_dbg("freeing page %p", p);
- if (j == OUT)
- set_page_dirty(p);
- put_page(p);
+ unpin_user_pages_dirty_lock(&p, 1, j == OUT);
ctx->pages[i][j] = NULL;
}
}
@@ -425,13 +423,13 @@ static int dax_lock_page(void *va, struct page **p)
dax_dbg("uva %p", va);
- ret = get_user_pages_fast((unsigned long)va, 1, FOLL_WRITE, p);
+ ret = pin_user_pages_fast((unsigned long)va, 1, FOLL_WRITE, p);
if (ret == 1) {
dax_dbg("locked page %p, for VA %p", *p, va);
return 0;
}
- dax_dbg("get_user_pages failed, va=%p, ret=%d", va, ret);
+ dax_dbg("pin_user_pages failed, va=%p, ret=%d", va, ret);
return -1;
}
base-commit: 3d1c1e5931ce45b3a3f309385bbc00c78e9951c6
--
2.26.2
next reply other threads:[~2020-05-17 2:08 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-17 2:08 John Hubbard [this message]
2020-05-17 19:46 ` [PATCH] oradax: convert get_user_pages() --> pin_user_pages() David Miller
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