[PATCH 02/13] csky: move setup_initrd() to setup.c

Mike Rapoport
2025-03-06T18:52:11Z

Memory used by initrd should be reserved as soon as possible before
there any memblock allocations that might overwrite that memory.

This will also help with pulling out memblock_free_all() to the generic
code and reducing code duplication in arch::mem_init().

Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
---
arch/csky/kernel/setup.c | 43 ++++++++++++++++++++++++++++++++++++++++
arch/csky/mm/init.c | 43 ----------------------------------------
2 files changed, 43 insertions(+), 43 deletions(-)

diff --git a/arch/csky/kernel/setup.c b/arch/csky/kernel/setup.c
index fe715b707fd0..e0d6ca86ea8c 100644
--- a/arch/csky/kernel/setup.c
+++ b/arch/csky/kernel/setup.c
@@ -12,6 +12,45 @@
#include <asm/mmu_context.h>
#include <asm/pgalloc.h>

+#ifdef CONFIG_BLK_DEV_INITRD
+static void __init setup_initrd(void)
+{
+ unsigned long size;
+
+ if (initrd_start >= initrd_end) {
+ pr_err("initrd not found or empty");
+ goto disable;
+ }
+
+ if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
+ pr_err("initrd extends beyond end of memory");
+ goto disable;
+ }
+
+ size = initrd_end - initrd_start;
+
+ if (memblock_is_region_reserved(__pa(initrd_start), size)) {
+ pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region",
+ __pa(initrd_start), size);
+ goto disable;
+ }
+
+ memblock_reserve(__pa(initrd_start), size);
+
+ pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
+ (void *)(initrd_start), size);
+
+ initrd_below_start_ok = 1;
+
+ return;
+
+disable:
+ initrd_start = initrd_end = 0;
+
+ pr_err(" - disabling initrd\n");
+}
+#endif
+
static void __init csky_memblock_init(void)
{
unsigned long lowmem_size = PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET);
@@ -40,6 +79,10 @@ static void __init csky_memblock_init(void)
max_low_pfn = min_low_pfn + sseg_size;
}

+#ifdef CONFIG_BLK_DEV_INITRD
+ setup_initrd();
+#endif
+
max_zone_pfn[ZONE_NORMAL] = max_low_pfn;

mmu_init(min_low_pfn, max_low_pfn);
diff --git a/arch/csky/mm/init.c b/arch/csky/mm/init.c
index bde7cabd23df..ab51acbc19b2 100644
--- a/arch/csky/mm/init.c
+++ b/arch/csky/mm/init.c
@@ -42,45 +42,6 @@ unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
__page_aligned_bss;
EXPORT_SYMBOL(empty_zero_page);

-#ifdef CONFIG_BLK_DEV_INITRD
-static void __init setup_initrd(void)
-{
- unsigned long size;
-
- if (initrd_start >= initrd_end) {
- pr_err("initrd not found or empty");
- goto disable;
- }
-
- if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
- pr_err("initrd extends beyond end of memory");
- goto disable;
- }
-
- size = initrd_end - initrd_start;
-
- if (memblock_is_region_reserved(__pa(initrd_start), size)) {
- pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region",
- __pa(initrd_start), size);
- goto disable;
- }
-
- memblock_reserve(__pa(initrd_start), size);
-
- pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
- (void *)(initrd_start), size);
-
- initrd_below_start_ok = 1;
-
- return;
-
-disable:
- initrd_start = initrd_end = 0;
-
- pr_err(" - disabling initrd\n");
-}
-#endif
-
void __init mem_init(void)
{
#ifdef CONFIG_HIGHMEM
@@ -92,10 +53,6 @@ void __init mem_init(void)
#endif
high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);

-#ifdef CONFIG_BLK_DEV_INITRD
- setup_initrd();
-#endif
-
memblock_free_all();

#ifdef CONFIG_HIGHMEM
--
2.47.2