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ramips: Fix early memory calculation for certain MIPS platforms

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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>
This commit is contained in:
Tobias Wolf 2018-08-19 13:04:02 +02:00 committed by John Crispin
parent 78a5d25dca
commit 93bfafb8dc
1 changed files with 45 additions and 0 deletions
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45
target/linux/ramips/patches-4.14/0003-MIPS-Fix-memory-reservation-in-bootmem_init-for-cert.patch Normal file
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@ -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;