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authorTobias Wolf <dev-NTEO@vplace.de>2018-08-19 13:04:02 +0200
committerJohn Crispin <john@phrozen.org>2018-09-10 10:07:42 +0200
commit93bfafb8dc209f153022796d9e747149e66cc29e (patch)
treef4d72e20ee692071a31ed97b0ee2745062e00fb0 /target/linux/ramips
parent78a5d25dca5de9b00890e7a414a6e423c4ba6e19 (diff)
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ramips: Fix early memory calculation for certain MIPS platforms
Kernel upstream commit 67a3ba25aa95 ("MIPS: Fix incorrect mem=X@Y handling") introduced a new issue for rt288x where "PHYS_OFFSET" is 0x0 but the calculated "ramstart" is not. As the prerequisite of custom memory map has been removed, this results in the full memory range of 0x0 - 0x8000000 to be marked as reserved for this platform. This patch adds the originally intended prerequisite again. Signed-off-by: Tobias Wolf <dev-NTEO@vplace.de>
Diffstat (limited to 'target/linux/ramips')
-rw-r--r--target/linux/ramips/patches-4.14/0003-MIPS-Fix-memory-reservation-in-bootmem_init-for-cert.patch45
1 files changed, 45 insertions, 0 deletions
diff --git a/target/linux/ramips/patches-4.14/0003-MIPS-Fix-memory-reservation-in-bootmem_init-for-cert.patch b/target/linux/ramips/patches-4.14/0003-MIPS-Fix-memory-reservation-in-bootmem_init-for-cert.patch
new file mode 100644
index 0000000000..d47f27e194
--- /dev/null
+++ b/target/linux/ramips/patches-4.14/0003-MIPS-Fix-memory-reservation-in-bootmem_init-for-cert.patch
@@ -0,0 +1,45 @@
+From: Tobias Wolf <dev-NTEO@vplace.de>
+Subject: [v2] MIPS: Fix memory reservation in bootmem_init for certain non-usermem setups
+
+Commit 67a3ba25aa95 ("MIPS: Fix incorrect mem=X@Y handling") introduced a new
+issue for rt288x where "PHYS_OFFSET" is 0x0 but the calculated "ramstart" is
+not. As the prerequisite of custom memory map has been removed, this results
+in the full memory range of 0x0 - 0x8000000 to be marked as reserved for this
+platform.
+
+v2: Correctly compare that usermem is not null.
+
+This patch adds the originally intended prerequisite again.
+
+Signed-off-by: Tobias Wolf <dev-NTEO@vplace.de>
+---
+
+--- a/arch/mips/kernel/setup.c 2018-08-18 19:07:07.142066706 +0200
++++ b/arch/mips/kernel/setup.c 2018-08-18 19:10:17.827918423 +0200
+@@ -369,6 +369,8 @@ static unsigned long __init bootmap_byte
+ return ALIGN(bytes, sizeof(long));
+ }
+
++static int usermem __initdata;
++
+ static void __init bootmem_init(void)
+ {
+ unsigned long reserved_end;
+@@ -442,7 +444,7 @@ static void __init bootmem_init(void)
+ /*
+ * Reserve any memory between the start of RAM and PHYS_OFFSET
+ */
+- if (ramstart > PHYS_OFFSET)
++ if (usermem && ramstart > PHYS_OFFSET)
+ add_memory_region(PHYS_OFFSET, ramstart - PHYS_OFFSET,
+ BOOT_MEM_RESERVED);
+
+@@ -652,8 +654,6 @@ static void __init bootmem_init(void)
+ * initialization hook for anything else was introduced.
+ */
+
+-static int usermem __initdata;
+-
+ static int __init early_parse_mem(char *p)
+ {
+ phys_addr_t start, size;