2020-05-31 07:17:27

by Souptick Joarder

Subject: [PATCH] staging: gasket: Convert get_user_pages*() --> pin_user_pages*()

In 2019, we introduced pin_user_pages*() and now we are converting
get_user_pages*() to the new API as appropriate. [1] & [2] could
be referred for more information.

[1] Documentation/core-api/pin_user_pages.rst

[2] "Explicit pinning of user-space pages":
https://lwn.net/Articles/807108/

Signed-off-by: Souptick Joarder <[email protected]>
Cc: John Hubbard <[email protected]>
Cc: Dan Carpenter <[email protected]>

---
Hi,

I'm compile tested this, but unable to run-time test, so any testing
help is much appriciated.

drivers/staging/gasket/gasket_page_table.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/gasket/gasket_page_table.c b/drivers/staging/gasket/gasket_page_table.c
index f6d7157..d712ad4 100644
--- a/drivers/staging/gasket/gasket_page_table.c
+++ b/drivers/staging/gasket/gasket_page_table.c
@@ -449,7 +449,7 @@ static bool gasket_release_page(struct page *page)

if (!PageReserved(page))
SetPageDirty(page);
- put_page(page);
+ unpin_user_page(page);

return true;
}
@@ -486,12 +486,12 @@ static int gasket_perform_mapping(struct gasket_page_table *pg_tbl,
ptes[i].dma_addr = pg_tbl->coherent_pages[0].paddr +
off + i * PAGE_SIZE;
} else {
- ret = get_user_pages_fast(page_addr - offset, 1,
+ ret = pin_user_pages_fast(page_addr - offset, 1,
FOLL_WRITE, &page);

if (ret <= 0) {
dev_err(pg_tbl->device,
- "get user pages failed for addr=0x%lx, offset=0x%lx [ret=%d]\n",
+ "pin user pages failed for addr=0x%lx, offset=0x%lx [ret=%d]\n",
page_addr, offset, ret);
return ret ? ret : -ENOMEM;
}
--
1.9.1

2020-05-31 09:07:50

by Dan Carpenter

Subject: Re: [PATCH] staging: gasket: Convert get_user_pages*() --> pin_user_pages*()

On Sun, May 31, 2020 at 12:53:11PM +0530, Souptick Joarder wrote:
> In 2019, we introduced pin_user_pages*() and now we are converting
> get_user_pages*() to the new API as appropriate. [1] & [2] could
> be referred for more information.
>
> [1] Documentation/core-api/pin_user_pages.rst
>
> [2] "Explicit pinning of user-space pages":
> https://lwn.net/Articles/807108/
>
> Signed-off-by: Souptick Joarder <[email protected]>
> Cc: John Hubbard <[email protected]>
> Cc: Dan Carpenter <[email protected]>
>

Acked-by: Dan Carpenter <[email protected]>

regards,
dan carpenter