of: Specify initrd location using 64-bit

On some PAE architectures, the entire range of physical memory could reside
outside the 32-bit limit.  These systems need the ability to specify the
initrd location using 64-bit numbers.

This patch globally modifies the early_init_dt_setup_initrd_arch() function to
use 64-bit numbers instead of the current unsigned long.

There has been quite a bit of debate about whether to use u64 or phys_addr_t.
It was concluded to stick to u64 to be consistent with rest of the device
tree code. As summarized by Geert, "The address to load the initrd is decided
by the bootloader/user and set at that point later in time. The dtb should not
be tied to the kernel you are booting"

More details on the discussion can be found here:
https://lkml.org/lkml/2013/6/20/690
https://lkml.org/lkml/2012/9/13/544

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>

diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c
index a08ce71854233e05510d45fc1183c19ecd35cb7c..81279ec73a6a7873b4a10fc8ec4c3546413bfd05 100644 (file)
--- a/arch/arc/mm/init.c
+++ b/arch/arc/mm/init.c
@@ -127,9 +127,8 @@ void __init free_initrd_mem(unsigned long start, unsigned long end)
 #endif
 
 #ifdef CONFIG_OF_FLATTREE
-void __init early_init_dt_setup_initrd_arch(unsigned long start,
-                                           unsigned long end)
+void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
 {
-       pr_err("%s(%lx, %lx)\n", __func__, start, end);
+       pr_err("%s(%llx, %llx)\n", __func__, start, end);
 }
 #endif /* CONFIG_OF_FLATTREE */

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 15225d829d7173b6169076ad063a388ceefe1248..81484177c9b86f571efd9e88cd91a402306c7d9a 100644 (file)
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -77,7 +77,7 @@ static int __init parse_tag_initrd2(const struct tag *tag)
 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
 
 #ifdef CONFIG_OF_FLATTREE
-void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end)
+void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
 {
        phys_initrd_start = start;
        phys_initrd_size = end - start;

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 67e8d7ce3fe7a68ac1c974058de83b8d6226086e..de2de5db628de2382e555b4256b9ad1f0f92ada5 100644 (file)
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -44,8 +44,7 @@ static unsigned long phys_initrd_size __initdata = 0;
 
 phys_addr_t memstart_addr __read_mostly = 0;
 
-void __init early_init_dt_setup_initrd_arch(unsigned long start,
-                                           unsigned long end)
+void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
 {
        phys_initrd_start = start;
        phys_initrd_size = end - start;

diff --git a/arch/c6x/kernel/devicetree.c b/arch/c6x/kernel/devicetree.c
index bdb56f09d0acc42eacf87398e48e08645ac727c8..287d0e64dfba58b955c10b4b8d4268140271c9c8 100644 (file)
--- a/arch/c6x/kernel/devicetree.c
+++ b/arch/c6x/kernel/devicetree.c
@@ -33,8 +33,7 @@ void __init early_init_devtree(void *params)
 
 
 #ifdef CONFIG_BLK_DEV_INITRD
-void __init early_init_dt_setup_initrd_arch(unsigned long start,
-               unsigned long end)
+void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
 {
        initrd_start = (unsigned long)__va(start);
        initrd_end = (unsigned long)__va(end);

diff --git a/arch/metag/mm/init.c b/arch/metag/mm/init.c
index 28813f164730f7110ccf470d6ef610932f166580..123919534b80fe3724612b61697441305d5b10a6 100644 (file)
--- a/arch/metag/mm/init.c
+++ b/arch/metag/mm/init.c
@@ -407,10 +407,9 @@ void free_initrd_mem(unsigned long start, unsigned long end)
 #endif
 
 #ifdef CONFIG_OF_FLATTREE
-void __init early_init_dt_setup_initrd_arch(unsigned long start,
-                                           unsigned long end)
+void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
 {
-       pr_err("%s(%lx, %lx)\n",
+       pr_err("%s(%llx, %llx)\n",
               __func__, start, end);
 }
 #endif /* CONFIG_OF_FLATTREE */

diff --git a/arch/microblaze/kernel/prom.c b/arch/microblaze/kernel/prom.c
index 0a2c68f9f9b0d61cf14e3f28de7ef23d87adcced..62e2e8f2c5d617a2a1c3271166441630b63b85cf 100644 (file)
--- a/arch/microblaze/kernel/prom.c
+++ b/arch/microblaze/kernel/prom.c
@@ -136,8 +136,7 @@ void __init early_init_devtree(void *params)
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
-void __init early_init_dt_setup_initrd_arch(unsigned long start,
-               unsigned long end)
+void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
 {
        initrd_start = (unsigned long)__va(start);
        initrd_end = (unsigned long)__va(end);

diff --git a/arch/mips/kernel/prom.c b/arch/mips/kernel/prom.c
index 7e954042f2526e66f21579f73d609452a5b1d726..0fa0b69cdd53bcc7e7d7d0bf836d3e40c767b4a4 100644 (file)
--- a/arch/mips/kernel/prom.c
+++ b/arch/mips/kernel/prom.c
@@ -58,8 +58,7 @@ void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
-void __init early_init_dt_setup_initrd_arch(unsigned long start,
-                                           unsigned long end)
+void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
 {
        initrd_start = (unsigned long)__va(start);
        initrd_end = (unsigned long)__va(end);

diff --git a/arch/openrisc/kernel/prom.c b/arch/openrisc/kernel/prom.c
index 5869e3fa5dd3ac4f9b31cd63140ac01592593ddd..150215a9171145655a5973cd376916699810f3aa 100644 (file)
--- a/arch/openrisc/kernel/prom.c
+++ b/arch/openrisc/kernel/prom.c
@@ -96,8 +96,7 @@ void __init early_init_devtree(void *params)
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
-void __init early_init_dt_setup_initrd_arch(unsigned long start,
-               unsigned long end)
+void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
 {
        initrd_start = (unsigned long)__va(start);
        initrd_end = (unsigned long)__va(end);

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index eb23ac92abb9089cea9ebc7fa19fd3a7e1404dbd..67d18dad43688d81d137225a03957c1b1e01a8d1 100644 (file)
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -550,8 +550,7 @@ void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
-void __init early_init_dt_setup_initrd_arch(unsigned long start,
-               unsigned long end)
+void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
 {
        initrd_start = (unsigned long)__va(start);
        initrd_end = (unsigned long)__va(end);

diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
index 69eb2fa254942e23537266c4e8a4d0a77c7ee04f..376dc7873447c80e27b8b765e6ff41a8f737da8a 100644 (file)
--- a/arch/x86/kernel/devicetree.c
+++ b/arch/x86/kernel/devicetree.c
@@ -52,8 +52,7 @@ void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
-void __init early_init_dt_setup_initrd_arch(unsigned long start,
-                                           unsigned long end)
+void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
 {
        initrd_start = (unsigned long)__va(start);
        initrd_end = (unsigned long)__va(end);

diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
index 42a8bba0b0ead4235add5133b7e849187641da53..101012bc1ff6d4d99ce408ad8614d1f6f3e2322e 100644 (file)
--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -170,8 +170,7 @@ static int __init parse_tag_fdt(const bp_tag_t *tag)
 
 __tagtable(BP_TAG_FDT, parse_tag_fdt);
 
-void __init early_init_dt_setup_initrd_arch(unsigned long start,
-               unsigned long end)
+void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
 {
        initrd_start = (void *)__va(start);
        initrd_end = (void *)__va(end);

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 6bb7cf2de556b559d1f54f9d1c7c3ff297138a3a..3f473d158d79567447ae720dd8d4bb48cf1e53b6 100644 (file)
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -550,7 +550,8 @@ int __init of_flat_dt_match(unsigned long node, const char *const *compat)
  */
 void __init early_init_dt_check_for_initrd(unsigned long node)
 {
-       unsigned long start, end, len;
+       u64 start, end;
+       unsigned long len;
        __be32 *prop;
 
        pr_debug("Looking for initrd properties... ");
@@ -558,15 +559,16 @@ void __init early_init_dt_check_for_initrd(unsigned long node)
        prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);
        if (!prop)
                return;
-       start = of_read_ulong(prop, len/4);
+       start = of_read_number(prop, len/4);
 
        prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);
        if (!prop)
                return;
-       end = of_read_ulong(prop, len/4);
+       end = of_read_number(prop, len/4);
 
        early_init_dt_setup_initrd_arch(start, end);
-       pr_debug("initrd_start=0x%lx  initrd_end=0x%lx\n", start, end);
+       pr_debug("initrd_start=0x%llx  initrd_end=0x%llx\n",
+                (unsigned long long)start, (unsigned long long)end);
 }
 #else
 inline void early_init_dt_check_for_initrd(unsigned long node)

diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
index ed136ad698ce622e4d150d7fda337a99c78d5a4e..4a17939b95cc100ff09e63135aa4543ad3f3e72a 100644 (file)
--- a/include/linux/of_fdt.h
+++ b/include/linux/of_fdt.h
@@ -106,8 +106,7 @@ extern u64 dt_mem_next_cell(int s, __be32 **cellp);
  * physical addresses.
  */
 #ifdef CONFIG_BLK_DEV_INITRD
-extern void early_init_dt_setup_initrd_arch(unsigned long start,
-                                           unsigned long end);
+extern void early_init_dt_setup_initrd_arch(u64 start, u64 end);
 #endif
 
 /* Early flat tree scan hooks */