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From: Mark Brown <>
To: Changbin Du <>
Cc: Mark Brown <>,,,,,,,,,,,,,
Subject: Applied "regulator: add dummy function of_find_regulator_by_node" to the regulator tree
Date: Sat,  5 May 2018 02:44:13 +0100 (BST)	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

The patch

   regulator: add dummy function of_find_regulator_by_node

has been applied to the regulator tree at 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.


>From 08813e0ec1cb48e53c86a24d88d26b26878e7b6e Mon Sep 17 00:00:00 2001
From: Changbin Du <>
Date: Wed, 2 May 2018 21:44:57 +0800
Subject: [PATCH] regulator: add dummy function of_find_regulator_by_node

If device tree is not enabled, of_find_regulator_by_node() should have
a dummy function since the function call is still there.

This is to fix build error after CONFIG_NO_AUTO_INLINE is introduced.
If this option is enabled, GCC will not auto-inline functions that are
not explicitly marked as inline.

In this case (no CONFIG_OF), the copmiler will report error in function

W/O NO_AUTO_INLINE, function of_get_regulator() is auto-inlined and then
the call to of_find_regulator_by_node() is optimized out since
of_get_regulator() always return NULL.

W/ NO_AUTO_INLINE, the return value of of_get_regulator() is a variable
so the call to of_find_regulator_by_node() cannot be optimized out. So
we need a stub of_find_regulator_by_node().

static struct regulator_dev *regulator_dev_lookup(struct device *dev,
						  const char *supply)
	struct regulator_dev *r = NULL;
	struct device_node *node;
	struct regulator_map *map;
	const char *devname = NULL;

	regulator_supply_alias(&dev, &supply);

	/* first do a dt based lookup */
	if (dev && dev->of_node) {
		node = of_get_regulator(dev, supply);
		if (node) {
			r = of_find_regulator_by_node(node);
			if (r)
				return r;

Signed-off-by: Changbin Du <>
Signed-off-by: Mark Brown <>
 drivers/regulator/internal.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/regulator/internal.h b/drivers/regulator/internal.h
index abfd56e8c78a..24fde1e08f3a 100644
--- a/drivers/regulator/internal.h
+++ b/drivers/regulator/internal.h
@@ -56,14 +56,19 @@ static inline struct regulator_dev *dev_to_rdev(struct device *dev)
 	return container_of(dev, struct regulator_dev, dev);
-struct regulator_dev *of_find_regulator_by_node(struct device_node *np);
 #ifdef CONFIG_OF
+struct regulator_dev *of_find_regulator_by_node(struct device_node *np);
 struct regulator_init_data *regulator_of_get_init_data(struct device *dev,
 			         const struct regulator_desc *desc,
 				 struct regulator_config *config,
 				 struct device_node **node);
+static inline struct regulator_dev *
+of_find_regulator_by_node(struct device_node *np)
+	return NULL;
 static inline struct regulator_init_data *
 regulator_of_get_init_data(struct device *dev,
 			   const struct regulator_desc *desc,

  parent reply	other threads:[~2018-05-05  1:44 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-01 13:00 [PATCH 0/5] kernel hacking: GCC optimization for debug experience (-Og) changbin.du
2018-05-01 13:00 ` [PATCH 1/5] x86/mm: surround level4_kernel_pgt with #ifdef CONFIG_X86_5LEVEL...#endif changbin.du
2018-05-01 13:00 ` [PATCH 2/5] regulator: add dummy of_find_regulator_by_node changbin.du
2018-05-01 20:40   ` Mark Brown
2018-05-02  9:24     ` Du, Changbin
2018-05-05  1:44   ` Mark Brown [this message]
2018-05-01 13:00 ` [PATCH 3/5] kernel hacking: new config NO_AUTO_INLINE to disable compiler atuo-inline optimizations changbin.du
2018-05-01 14:54   ` Steven Rostedt
2018-05-02  9:27     ` Du, Changbin
2018-05-01 13:00 ` [PATCH 4/5] kernel hacking: new config DEBUG_EXPERIENCE to apply GCC -Og optimization changbin.du
2018-05-01 15:25   ` Randy Dunlap
2018-05-02  9:24     ` Du, Changbin
2018-05-02 20:30   ` Arnd Bergmann
2018-05-01 13:00 ` [PATCH 5/5] asm-generic: fix build error in fix_to_virt with CONFIG_DEBUG_EXPERIENCE changbin.du
2018-05-02  7:33 ` [PATCH 0/5] kernel hacking: GCC optimization for debug experience (-Og) Ingo Molnar
2018-05-02  9:07   ` Du, Changbin
2018-05-02 11:09     ` Ingo Molnar

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