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From: Marco Felsch <>
Subject: [PATCH v3 1/3] driver: add flag to check if cdev is an mci device
Date: Mon, 10 May 2021 12:25:21 +0200	[thread overview]
Message-ID: <> (raw)

We need this during mount() to check if the cdev is an mmc/mci main|user
hardware partition device. Later on we add the feature to pass
"root=/dev/mmcblkXpN" as kernel command line.

Signed-off-by: Marco Felsch <>
- no changes

- dropped the !!
- renamed the flag due to v1 comments
- renamed the function to

 include/driver.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/driver.h b/include/driver.h
index 0d43b36148..d84fe35d50 100644
--- a/include/driver.h
+++ b/include/driver.h
@@ -496,6 +496,7 @@ int cdev_erase(struct cdev *cdev, loff_t count, loff_t offset);
 #define DEVFS_IS_CHARACTER_DEV		(1U << 3)
+#define DEVFS_IS_MCI_MAIN_PART_DEV	(1U << 5)
 struct cdev *devfs_add_partition(const char *devname, loff_t offset,
 		loff_t size, unsigned int flags, const char *name);
@@ -509,6 +510,11 @@ static inline void cdev_create_default_automount(struct cdev *cdev)
+static inline bool cdev_is_mci_main_part_dev(struct cdev *cdev)
+	return cdev->flags & DEVFS_IS_MCI_MAIN_PART_DEV;

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             reply	other threads:[~2021-05-10 10:30 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-10 10:25 Marco Felsch [this message]
2021-05-10 10:25 ` [PATCH v3 2/3] mci: mci-core: set the DEVFS_IS_MCI_MAIN_PART_DEV flag Marco Felsch
2021-05-10 10:25 ` [PATCH v3 3/3] fs: add linux_rootarg 'root=mmcblkXpN' support Marco Felsch
2021-05-12  5:25 ` [PATCH v3 1/3] driver: add flag to check if cdev is an mci device Sascha Hauer

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