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* [PATCH] firmware_loader: Replace kmap() with kmap_local_page()
@ 2022-07-10 10:11 Fabio M. De Francesco
  2022-07-10 10:24 ` Greg Kroah-Hartman
  2022-07-10 11:43 ` kernel test robot
  0 siblings, 2 replies; 10+ messages in thread
From: Fabio M. De Francesco @ 2022-07-10 10:11 UTC (permalink / raw)
  To: Luis Chamberlain, Russ Weight, Greg Kroah-Hartman,
	Rafael J. Wysocki, Nick Terrell, linux-kernel
  Cc: Fabio M. De Francesco, Ira Weiny

The use of kmap() is being deprecated in favor of kmap_local_page().

With kmap_local_page() the mappings are per thread, CPU local, can take
page faults, and can be called from any context (including interrupts).

Call kmap_local_page() in firmware_loader wherever kmap() is currently
used. In firmware_rw() use the copy_{from,to}_page() helpers instead of
open coding the local mappings plus memcpy().

Suggested-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
---
 drivers/base/firmware_loader/main.c  | 4 ++--
 drivers/base/firmware_loader/sysfs.c | 9 ++++-----
 2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmware_loader/main.c
index ac3f34e80194..7c3590fd97c2 100644
--- a/drivers/base/firmware_loader/main.c
+++ b/drivers/base/firmware_loader/main.c
@@ -435,11 +435,11 @@ static int fw_decompress_xz_pages(struct device *dev, struct fw_priv *fw_priv,
 
 		/* decompress onto the new allocated page */
 		page = fw_priv->pages[fw_priv->nr_pages - 1];
-		xz_buf.out = kmap(page);
+		xz_buf.out = kmap_local_page(page);
 		xz_buf.out_pos = 0;
 		xz_buf.out_size = PAGE_SIZE;
 		xz_ret = xz_dec_run(xz_dec, &xz_buf);
-		kunmap(page);
+		kunmap_local(xz_buf.out);
 		fw_priv->size += xz_buf.out_pos;
 		/* partial decompression means either end or error */
 		if (xz_buf.out_pos != PAGE_SIZE)
diff --git a/drivers/base/firmware_loader/sysfs.c b/drivers/base/firmware_loader/sysfs.c
index 5b0b85b70b6f..10ae9c8fb6cf 100644
--- a/drivers/base/firmware_loader/sysfs.c
+++ b/drivers/base/firmware_loader/sysfs.c
@@ -247,14 +247,13 @@ static void firmware_rw(struct fw_priv *fw_priv, char *buffer,
 		int page_ofs = offset & (PAGE_SIZE - 1);
 		int page_cnt = min_t(size_t, PAGE_SIZE - page_ofs, count);
 
-		page_data = kmap(fw_priv->pages[page_nr]);
-
 		if (read)
-			memcpy(buffer, page_data + page_ofs, page_cnt);
+			memcpy_from_page(buffer, fw_priv->pages[page_nr],
+					 page_ofs, page_cnt);
 		else
-			memcpy(page_data + page_ofs, buffer, page_cnt);
+			memcpy_to_page(fw_priv->pages[page_nr], page_ofs,
+				       buffer, page_cnt);
 
-		kunmap(fw_priv->pages[page_nr]);
 		buffer += page_cnt;
 		offset += page_cnt;
 		count -= page_cnt;
-- 
2.36.1


^ permalink raw reply related	[flat|nested] 10+ messages in thread

end of thread, other threads:[~2022-07-14 23:54 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-07-10 10:11 [PATCH] firmware_loader: Replace kmap() with kmap_local_page() Fabio M. De Francesco
2022-07-10 10:24 ` Greg Kroah-Hartman
2022-07-10 11:18   ` Fabio M. De Francesco
2022-07-10 11:57     ` Greg Kroah-Hartman
2022-07-10 12:24       ` Fabio M. De Francesco
2022-07-11 18:52       ` Fabio M. De Francesco
2022-07-14 14:50         ` Greg Kroah-Hartman
2022-07-14 20:40           ` Luis Chamberlain
2022-07-14 23:54             ` Fabio M. De Francesco
2022-07-10 11:43 ` kernel test robot

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