[PATCH v2 1/3] nvmem: rmem: get, don't request, memory region

[PATCH v2 1/3] nvmem: rmem: get, don't request, memory region

[Ahmad Fatoum]

nvmem-rmem is a compatible for reserved memory entries, so the driver
can't expect exclusive access to this region.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
v1 -> v2:
  - no change
---
 drivers/nvmem/rmem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvmem/rmem.c b/drivers/nvmem/rmem.c
index cd735e5ef39d..b9331f48ffac 100644
--- a/drivers/nvmem/rmem.c
+++ b/drivers/nvmem/rmem.c
@@ -31,7 +31,7 @@ static int rmem_probe(struct device_d *dev)
 	struct resource *mem;
 	struct rmem *priv;
 
-	mem = dev_request_mem_resource(dev, 0);
+	mem = dev_get_resource(dev, IORESOURCE_MEM, 0);
 	if (IS_ERR(mem))
 		return PTR_ERR(mem);
 
-- 
2.30.2


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[PATCH v2 2/3] of: remove unused and misleading #cells in /memreserve

[Ahmad Fatoum]

barebox creates a /memreserve node to hold FDT reservation entries
inside its reg property for unflattened device trees that are copied
back into the FDT reservation table on flattening.

These reservation entries are pairs of big-endian 64-bit start+size
pairs. To properly describe these in DT, we would need the
(#address|#size)-cells properties at the root node, not in the same node
having the reg property. As we don't read back these properties anyway,
just drop them.

No functional change.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
v1 -> v2:
  - new patch
---
 drivers/of/fdt.c | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 5ccbd1bb69f8..42f45bbd4fb5 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -70,7 +70,6 @@ static int of_unflatten_reservemap(struct device_node *root,
 	int n;
 	struct property *p;
 	struct device_node *memreserve;
-	__be32 cells;
 
 	n = of_reservemap_num_entries(fdt);
 	if (n <= 0)
@@ -80,16 +79,6 @@ static int of_unflatten_reservemap(struct device_node *root,
 	if (!memreserve)
 		return -ENOMEM;
 
-	cells = cpu_to_be32(2);
-
-	p = of_new_property(memreserve, "#address-cells", &cells, sizeof(__be32));
-	if (!p)
-		return -ENOMEM;
-
-	p = of_new_property(memreserve, "#size-cells", &cells, sizeof(__be32));
-	if (!p)
-		return -ENOMEM;
-
 	p = of_new_property(memreserve, "reg",
 			    (void *)fdt + be32_to_cpu(fdt->off_mem_rsvmap),
 			    n * sizeof(struct fdt_reserve_entry));
-- 
2.30.2


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[PATCH v2 3/3] of: request reserved memory regions so other code can't

[Ahmad Fatoum]

Add a new of_reserved_mem_walk that can be used to request
reserved memory regions. This avoids e.g. bootm trying to
place the kernel into a reserved region.

Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
v1 -> v2:
  - don't use of_reserve_entry accounting and instead
    directly request memory (Sascha)
---
 common/memory.c           | 21 ++++++++++--
 drivers/of/Makefile       |  1 +
 drivers/of/reserved-mem.c | 71 +++++++++++++++++++++++++++++++++++++++
 include/of.h              |  9 +++++
 4 files changed, 99 insertions(+), 3 deletions(-)
 create mode 100644 drivers/of/reserved-mem.c

diff --git a/common/memory.c b/common/memory.c
index 95995bb6e310..fd782c7f24f6 100644
--- a/common/memory.c
+++ b/common/memory.c
@@ -3,6 +3,8 @@
  * Copyright (c) 2011 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
  */
 
+#define pr_fmt(fmt) "memory: " fmt
+
 #include <common.h>
 #include <memory.h>
 #include <of.h>
@@ -12,6 +14,7 @@
 #include <asm-generic/memory_layout.h>
 #include <asm/sections.h>
 #include <malloc.h>
+#include <of.h>
 
 /*
  * Begin and End of memory area for malloc(), and current "brk"
@@ -53,9 +56,20 @@ void mem_malloc_init(void *start, void *end)
 	mem_malloc_initialized = 1;
 }
 
-#if !defined __SANDBOX__
+static int request_reservation(const struct resource *res)
+{
+	if (!(res->flags & IORESOURCE_EXCLUSIVE))
+		return 0;
+
+	pr_debug("region %s %pa-%pa\n", res->name, &res->start, &res->end);
+
+	request_sdram_region(res->name, res->start, resource_size(res));
+	return 0;
+}
+
 static int mem_malloc_resource(void)
 {
+#if !defined __SANDBOX__
 	/*
 	 * Normally it's a bug when one of these fails,
 	 * but we have some setups where some of these
@@ -77,13 +91,14 @@ static int mem_malloc_resource(void)
 			(unsigned long)&__bss_start,
 			(unsigned long)&__bss_stop -
 			(unsigned long)&__bss_start);
+#endif
 #ifdef STACK_BASE
 	request_sdram_region("stack", STACK_BASE, STACK_SIZE);
 #endif
-	return 0;
+
+	return of_reserved_mem_walk(request_reservation);
 }
 coredevice_initcall(mem_malloc_resource);
-#endif
 
 static void *sbrk_no_zero(ptrdiff_t increment)
 {
diff --git a/drivers/of/Makefile b/drivers/of/Makefile
index ca8da71cb4f0..99b610cba85e 100644
--- a/drivers/of/Makefile
+++ b/drivers/of/Makefile
@@ -5,6 +5,7 @@ obj-$(CONFIG_OF_GPIO) += of_gpio.o
 obj-$(CONFIG_OF_PCI) += of_pci.o
 obj-y += partition.o
 obj-y += of_net.o
+obj-$(CONFIG_OFDEVICE) += reserved-mem.o
 obj-$(CONFIG_MTD) += of_mtd.o
 obj-$(CONFIG_OF_BAREBOX_DRIVERS) += barebox.o
 obj-$(CONFIG_OF_OVERLAY) += overlay.o resolver.o of_firmware.o
diff --git a/drivers/of/reserved-mem.c b/drivers/of/reserved-mem.c
new file mode 100644
index 000000000000..34e61dfea343
--- /dev/null
+++ b/drivers/of/reserved-mem.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// SPDX-FileCopyrightText: 2021 Rouven Czerwinski <r.czerwinski@pengutronix.de>, Pengutronix
+
+#include <stdio.h>
+#include <of.h>
+#include <of_address.h>
+
+#define MEMRESERVE_NCELLS	2
+#define MEMRESERVE_FLAGS	(IORESOURCE_MEM | IORESOURCE_EXCLUSIVE)
+
+int of_reserved_mem_walk(int (*handler)(const struct resource *res))
+{
+	struct device_node *node, *child;
+	int ncells = 0;
+	const __be32 *reg;
+	int ret;
+
+	node = of_find_node_by_path("/reserved-memory");
+	if (node) {
+		for_each_available_child_of_node(node, child) {
+			struct resource resource = {};
+
+			/* skip e.g. linux,cma */
+			if (!of_get_property(child, "reg", NULL))
+				continue;
+
+			of_address_to_resource(child, 0, &resource);
+
+			resource.name = child->name;
+			resource.flags = MEMRESERVE_FLAGS;
+
+			ret = handler(&resource);
+			if (ret)
+				return ret;
+		}
+	}
+
+	node = of_find_node_by_path("/memreserve");
+	reg = of_get_property(node, "reg", &ncells);
+	ncells /= sizeof(__be32);
+	if (reg) {
+		char name[sizeof "fdt-memreserve-4294967295"];
+		int i = 0, n = 0;
+
+		while (i < ncells) {
+			struct resource resource = {};
+			u64 size;
+
+			snprintf(name, sizeof(name), "fdt-memreserve-%u", n++);
+			resource.name = name;
+			resource.flags = MEMRESERVE_FLAGS;
+
+			resource.start = of_read_number(reg + i, MEMRESERVE_NCELLS);
+			i += MEMRESERVE_NCELLS;
+
+			size = of_read_number(reg + i, MEMRESERVE_NCELLS);
+			i += MEMRESERVE_NCELLS;
+
+			if (!size)
+				continue;
+
+			resource.end = resource.start + size - 1;
+
+			ret = handler(&resource);
+			if (ret)
+				return ret;
+		}
+	}
+
+	return 0;
+}
diff --git a/include/of.h b/include/of.h
index 46b96277d581..c0b715924a18 100644
--- a/include/of.h
+++ b/include/of.h
@@ -64,6 +64,7 @@ void fdt_add_reserve_map(void *fdt);
 
 struct device_d;
 struct driver_d;
+struct resource;
 
 int of_fix_tree(struct device_node *);
 
@@ -317,6 +318,9 @@ struct device_node *of_find_node_by_path_or_alias(struct device_node *root,
 int of_autoenable_device_by_path(char *path);
 int of_autoenable_i2c_by_component(char *path);
 int of_prepend_machine_compatible(struct device_node *root, const char *compat);
+
+int of_reserved_mem_walk(int (*handler)(const struct resource *res));
+
 #else
 static inline bool of_node_name_eq(const struct device_node *np, const char *name)
 {
@@ -841,6 +845,11 @@ static inline int of_prepend_machine_compatible(struct device_node *root,
 	return -ENODEV;
 }
 
+static inline int of_reserved_mem_walk(int (*handler)(const struct resource *res))
+{
+	return 0;
+}
+
 #endif
 
 #define for_each_property_of_node(dn, pp) \
-- 
2.30.2


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Re: [PATCH v2 1/3] nvmem: rmem: get, don't request, memory region

[Sascha Hauer]

On Thu, Jun 09, 2022 at 01:18:08PM +0200, Ahmad Fatoum wrote:
> nvmem-rmem is a compatible for reserved memory entries, so the driver
> can't expect exclusive access to this region.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
> ---
> v1 -> v2:
>   - no change
> ---
>  drivers/nvmem/rmem.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied, thanks

Sascha

> 
> diff --git a/drivers/nvmem/rmem.c b/drivers/nvmem/rmem.c
> index cd735e5ef39d..b9331f48ffac 100644
> --- a/drivers/nvmem/rmem.c
> +++ b/drivers/nvmem/rmem.c
> @@ -31,7 +31,7 @@ static int rmem_probe(struct device_d *dev)
>  	struct resource *mem;
>  	struct rmem *priv;
>  
> -	mem = dev_request_mem_resource(dev, 0);
> +	mem = dev_get_resource(dev, IORESOURCE_MEM, 0);
>  	if (IS_ERR(mem))
>  		return PTR_ERR(mem);
>  
> -- 
> 2.30.2
> 
> 
> _______________________________________________
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> barebox@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/barebox
> 

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Re: [PATCH v2 3/3] of: request reserved memory regions so other code can't

[Sascha Hauer]

On Thu, Jun 09, 2022 at 01:18:10PM +0200, Ahmad Fatoum wrote:
> Add a new of_reserved_mem_walk that can be used to request
> reserved memory regions. This avoids e.g. bootm trying to
> place the kernel into a reserved region.
> 
> Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
> ---
> v1 -> v2:
>   - don't use of_reserve_entry accounting and instead
>     directly request memory (Sascha)
> ---
>  common/memory.c           | 21 ++++++++++--
>  drivers/of/Makefile       |  1 +
>  drivers/of/reserved-mem.c | 71 +++++++++++++++++++++++++++++++++++++++
>  include/of.h              |  9 +++++
>  4 files changed, 99 insertions(+), 3 deletions(-)
>  create mode 100644 drivers/of/reserved-mem.c
> 
> diff --git a/common/memory.c b/common/memory.c
> index 95995bb6e310..fd782c7f24f6 100644
> --- a/common/memory.c
> +++ b/common/memory.c
> @@ -3,6 +3,8 @@
>   * Copyright (c) 2011 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
>   */
>  
> +#define pr_fmt(fmt) "memory: " fmt
> +
>  #include <common.h>
>  #include <memory.h>
>  #include <of.h>
> @@ -12,6 +14,7 @@
>  #include <asm-generic/memory_layout.h>
>  #include <asm/sections.h>
>  #include <malloc.h>
> +#include <of.h>
>  
>  /*
>   * Begin and End of memory area for malloc(), and current "brk"
> @@ -53,9 +56,20 @@ void mem_malloc_init(void *start, void *end)
>  	mem_malloc_initialized = 1;
>  }
>  
> -#if !defined __SANDBOX__
> +static int request_reservation(const struct resource *res)
> +{
> +	if (!(res->flags & IORESOURCE_EXCLUSIVE))
> +		return 0;
> +
> +	pr_debug("region %s %pa-%pa\n", res->name, &res->start, &res->end);
> +
> +	request_sdram_region(res->name, res->start, resource_size(res));
> +	return 0;
> +}
> +
>  static int mem_malloc_resource(void)
>  {
> +#if !defined __SANDBOX__
>  	/*
>  	 * Normally it's a bug when one of these fails,
>  	 * but we have some setups where some of these
> @@ -77,13 +91,14 @@ static int mem_malloc_resource(void)
>  			(unsigned long)&__bss_start,
>  			(unsigned long)&__bss_stop -
>  			(unsigned long)&__bss_start);
> +#endif
>  #ifdef STACK_BASE
>  	request_sdram_region("stack", STACK_BASE, STACK_SIZE);
>  #endif
> -	return 0;
> +
> +	return of_reserved_mem_walk(request_reservation);
>  }
>  coredevice_initcall(mem_malloc_resource);
> -#endif
>  
>  static void *sbrk_no_zero(ptrdiff_t increment)
>  {
> diff --git a/drivers/of/Makefile b/drivers/of/Makefile
> index ca8da71cb4f0..99b610cba85e 100644
> --- a/drivers/of/Makefile
> +++ b/drivers/of/Makefile
> @@ -5,6 +5,7 @@ obj-$(CONFIG_OF_GPIO) += of_gpio.o
>  obj-$(CONFIG_OF_PCI) += of_pci.o
>  obj-y += partition.o
>  obj-y += of_net.o
> +obj-$(CONFIG_OFDEVICE) += reserved-mem.o

Compilation of this file depends on CONFIG_OFDEVICE, but the static
inline wrapper or not decision depends on CONFIG_OFTREE. This breaks a
number of defconfigs.
I took the easiest way out for now and changed to obj-y above to fix
this.

Sascha

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Pengutronix e.K.                           |                             |
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Re: [PATCH v2 3/3] of: request reserved memory regions so other code can't

[Ahmad Fatoum]

On 15.06.22 07:08, Sascha Hauer wrote:
> On Thu, Jun 09, 2022 at 01:18:10PM +0200, Ahmad Fatoum wrote:
>> Add a new of_reserved_mem_walk that can be used to request
>> reserved memory regions. This avoids e.g. bootm trying to
>> place the kernel into a reserved region.
>>
>> Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
>> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
>> ---
>> v1 -> v2:
>>   - don't use of_reserve_entry accounting and instead
>>     directly request memory (Sascha)
>> ---
>>  common/memory.c           | 21 ++++++++++--
>>  drivers/of/Makefile       |  1 +
>>  drivers/of/reserved-mem.c | 71 +++++++++++++++++++++++++++++++++++++++
>>  include/of.h              |  9 +++++
>>  4 files changed, 99 insertions(+), 3 deletions(-)
>>  create mode 100644 drivers/of/reserved-mem.c
>>
>> diff --git a/common/memory.c b/common/memory.c
>> index 95995bb6e310..fd782c7f24f6 100644
>> --- a/common/memory.c
>> +++ b/common/memory.c
>> @@ -3,6 +3,8 @@
>>   * Copyright (c) 2011 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
>>   */
>>  
>> +#define pr_fmt(fmt) "memory: " fmt
>> +
>>  #include <common.h>
>>  #include <memory.h>
>>  #include <of.h>
>> @@ -12,6 +14,7 @@
>>  #include <asm-generic/memory_layout.h>
>>  #include <asm/sections.h>
>>  #include <malloc.h>
>> +#include <of.h>
>>  
>>  /*
>>   * Begin and End of memory area for malloc(), and current "brk"
>> @@ -53,9 +56,20 @@ void mem_malloc_init(void *start, void *end)
>>  	mem_malloc_initialized = 1;
>>  }
>>  
>> -#if !defined __SANDBOX__
>> +static int request_reservation(const struct resource *res)
>> +{
>> +	if (!(res->flags & IORESOURCE_EXCLUSIVE))
>> +		return 0;
>> +
>> +	pr_debug("region %s %pa-%pa\n", res->name, &res->start, &res->end);
>> +
>> +	request_sdram_region(res->name, res->start, resource_size(res));
>> +	return 0;
>> +}
>> +
>>  static int mem_malloc_resource(void)
>>  {
>> +#if !defined __SANDBOX__
>>  	/*
>>  	 * Normally it's a bug when one of these fails,
>>  	 * but we have some setups where some of these
>> @@ -77,13 +91,14 @@ static int mem_malloc_resource(void)
>>  			(unsigned long)&__bss_start,
>>  			(unsigned long)&__bss_stop -
>>  			(unsigned long)&__bss_start);
>> +#endif
>>  #ifdef STACK_BASE
>>  	request_sdram_region("stack", STACK_BASE, STACK_SIZE);
>>  #endif
>> -	return 0;
>> +
>> +	return of_reserved_mem_walk(request_reservation);
>>  }
>>  coredevice_initcall(mem_malloc_resource);
>> -#endif
>>  
>>  static void *sbrk_no_zero(ptrdiff_t increment)
>>  {
>> diff --git a/drivers/of/Makefile b/drivers/of/Makefile
>> index ca8da71cb4f0..99b610cba85e 100644
>> --- a/drivers/of/Makefile
>> +++ b/drivers/of/Makefile
>> @@ -5,6 +5,7 @@ obj-$(CONFIG_OF_GPIO) += of_gpio.o
>>  obj-$(CONFIG_OF_PCI) += of_pci.o
>>  obj-y += partition.o
>>  obj-y += of_net.o
>> +obj-$(CONFIG_OFDEVICE) += reserved-mem.o
> 
> Compilation of this file depends on CONFIG_OFDEVICE, but the static
> inline wrapper or not decision depends on CONFIG_OFTREE. This breaks a
> number of defconfigs.
> I took the easiest way out for now and changed to obj-y above to fix
> this.

I am surprised that works. With !CONFIG_OFTREE, <of.h> included in
reserved-mem.c would provide a static inline helper that should
clash with of_reserved_mem_walk defined with external linkage
in that file. Can you change this into obj-$(CONFIG_OFTREE)?

Thanks and sorry for the hassle,
Ahmad

> 
> Sascha
> 


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Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
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Re: [PATCH v2 3/3] of: request reserved memory regions so other code can't

[Sascha Hauer]

On Wed, Jun 15, 2022 at 08:06:29AM +0200, Ahmad Fatoum wrote:
> On 15.06.22 07:08, Sascha Hauer wrote:
> > On Thu, Jun 09, 2022 at 01:18:10PM +0200, Ahmad Fatoum wrote:
> >> Add a new of_reserved_mem_walk that can be used to request
> >> reserved memory regions. This avoids e.g. bootm trying to
> >> place the kernel into a reserved region.
> >>
> >> Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
> >> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
> >> ---
> >> v1 -> v2:
> >>   - don't use of_reserve_entry accounting and instead
> >>     directly request memory (Sascha)
> >> ---
> >>  common/memory.c           | 21 ++++++++++--
> >>  drivers/of/Makefile       |  1 +
> >>  drivers/of/reserved-mem.c | 71 +++++++++++++++++++++++++++++++++++++++
> >>  include/of.h              |  9 +++++
> >>  4 files changed, 99 insertions(+), 3 deletions(-)
> >>  create mode 100644 drivers/of/reserved-mem.c
> >>
> >> diff --git a/common/memory.c b/common/memory.c
> >> index 95995bb6e310..fd782c7f24f6 100644
> >> --- a/common/memory.c
> >> +++ b/common/memory.c
> >> @@ -3,6 +3,8 @@
> >>   * Copyright (c) 2011 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
> >>   */
> >>  
> >> +#define pr_fmt(fmt) "memory: " fmt
> >> +
> >>  #include <common.h>
> >>  #include <memory.h>
> >>  #include <of.h>
> >> @@ -12,6 +14,7 @@
> >>  #include <asm-generic/memory_layout.h>
> >>  #include <asm/sections.h>
> >>  #include <malloc.h>
> >> +#include <of.h>
> >>  
> >>  /*
> >>   * Begin and End of memory area for malloc(), and current "brk"
> >> @@ -53,9 +56,20 @@ void mem_malloc_init(void *start, void *end)
> >>  	mem_malloc_initialized = 1;
> >>  }
> >>  
> >> -#if !defined __SANDBOX__
> >> +static int request_reservation(const struct resource *res)
> >> +{
> >> +	if (!(res->flags & IORESOURCE_EXCLUSIVE))
> >> +		return 0;
> >> +
> >> +	pr_debug("region %s %pa-%pa\n", res->name, &res->start, &res->end);
> >> +
> >> +	request_sdram_region(res->name, res->start, resource_size(res));
> >> +	return 0;
> >> +}
> >> +
> >>  static int mem_malloc_resource(void)
> >>  {
> >> +#if !defined __SANDBOX__
> >>  	/*
> >>  	 * Normally it's a bug when one of these fails,
> >>  	 * but we have some setups where some of these
> >> @@ -77,13 +91,14 @@ static int mem_malloc_resource(void)
> >>  			(unsigned long)&__bss_start,
> >>  			(unsigned long)&__bss_stop -
> >>  			(unsigned long)&__bss_start);
> >> +#endif
> >>  #ifdef STACK_BASE
> >>  	request_sdram_region("stack", STACK_BASE, STACK_SIZE);
> >>  #endif
> >> -	return 0;
> >> +
> >> +	return of_reserved_mem_walk(request_reservation);
> >>  }
> >>  coredevice_initcall(mem_malloc_resource);
> >> -#endif
> >>  
> >>  static void *sbrk_no_zero(ptrdiff_t increment)
> >>  {
> >> diff --git a/drivers/of/Makefile b/drivers/of/Makefile
> >> index ca8da71cb4f0..99b610cba85e 100644
> >> --- a/drivers/of/Makefile
> >> +++ b/drivers/of/Makefile
> >> @@ -5,6 +5,7 @@ obj-$(CONFIG_OF_GPIO) += of_gpio.o
> >>  obj-$(CONFIG_OF_PCI) += of_pci.o
> >>  obj-y += partition.o
> >>  obj-y += of_net.o
> >> +obj-$(CONFIG_OFDEVICE) += reserved-mem.o
> > 
> > Compilation of this file depends on CONFIG_OFDEVICE, but the static
> > inline wrapper or not decision depends on CONFIG_OFTREE. This breaks a
> > number of defconfigs.
> > I took the easiest way out for now and changed to obj-y above to fix
> > this.
> 
> I am surprised that works. With !CONFIG_OFTREE, <of.h> included in
> reserved-mem.c would provide a static inline helper that should
> clash with of_reserved_mem_walk defined with external linkage
> in that file. Can you change this into obj-$(CONFIG_OFTREE)?

I should have mentioned it's obj-$(CONFIG_OFTREE) implicitly because the
directory is obj-$(CONFIG_OFTREE).

Sascha

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