mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-09-04 20:19:47 +08:00
c6f239796b
Before SLUB initialization, various subsystems used memblock_alloc to allocate memory. In most cases, when memory allocation fails, an immediate panic is required. To simplify this behavior and reduce repetitive checks, introduce `memblock_alloc_or_panic`. This function ensures that memory allocation failures result in a panic automatically, improving code readability and consistency across subsystems that require this behavior. [guoweikang.kernel@gmail.com: arch/s390: save_area_alloc default failure behavior changed to panic] Link: https://lkml.kernel.org/r/20250109033136.2845676-1-guoweikang.kernel@gmail.com Link: https://lore.kernel.org/lkml/Z2fknmnNtiZbCc7x@kernel.org/ Link: https://lkml.kernel.org/r/20250102072528.650926-1-guoweikang.kernel@gmail.com Signed-off-by: Guo Weikang <guoweikang.kernel@gmail.com> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k] Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com> [s390] Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
128 lines
2.8 KiB
C
128 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* linux/arch/m68k/mm/init.c
|
|
*
|
|
* Copyright (C) 1995 Hamish Macdonald
|
|
*
|
|
* Contains common initialization routines, specific init code moved
|
|
* to motorola.c and sun3mmu.c
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/types.h>
|
|
#include <linux/init.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/gfp.h>
|
|
|
|
#include <asm/setup.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/traps.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/io.h>
|
|
#ifdef CONFIG_ATARI
|
|
#include <asm/atari_stram.h>
|
|
#endif
|
|
#include <asm/sections.h>
|
|
#include <asm/tlb.h>
|
|
|
|
/*
|
|
* ZERO_PAGE is a special page that is used for zero-initialized
|
|
* data and COW.
|
|
*/
|
|
void *empty_zero_page;
|
|
EXPORT_SYMBOL(empty_zero_page);
|
|
|
|
#ifdef CONFIG_MMU
|
|
|
|
int m68k_virt_to_node_shift;
|
|
|
|
void __init m68k_setup_node(int node)
|
|
{
|
|
node_set_online(node);
|
|
}
|
|
|
|
#else /* CONFIG_MMU */
|
|
|
|
/*
|
|
* paging_init() continues the virtual memory environment setup which
|
|
* was begun by the code in arch/head.S.
|
|
* The parameters are pointers to where to stick the starting and ending
|
|
* addresses of available kernel virtual memory.
|
|
*/
|
|
void __init paging_init(void)
|
|
{
|
|
/*
|
|
* Make sure start_mem is page aligned, otherwise bootmem and
|
|
* page_alloc get different views of the world.
|
|
*/
|
|
unsigned long end_mem = memory_end & PAGE_MASK;
|
|
unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, };
|
|
|
|
high_memory = (void *) end_mem;
|
|
|
|
empty_zero_page = memblock_alloc_or_panic(PAGE_SIZE, PAGE_SIZE);
|
|
max_zone_pfn[ZONE_DMA] = end_mem >> PAGE_SHIFT;
|
|
free_area_init(max_zone_pfn);
|
|
}
|
|
|
|
#endif /* CONFIG_MMU */
|
|
|
|
void free_initmem(void)
|
|
{
|
|
#ifndef CONFIG_MMU_SUN3
|
|
free_initmem_default(-1);
|
|
#endif /* CONFIG_MMU_SUN3 */
|
|
}
|
|
|
|
#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
|
|
#define VECTORS &vectors[0]
|
|
#else
|
|
#define VECTORS _ramvec
|
|
#endif
|
|
|
|
static inline void init_pointer_tables(void)
|
|
{
|
|
#if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
|
|
int i, j;
|
|
|
|
/* insert pointer tables allocated so far into the tablelist */
|
|
init_pointer_table(kernel_pg_dir, TABLE_PGD);
|
|
for (i = 0; i < PTRS_PER_PGD; i++) {
|
|
pud_t *pud = (pud_t *)&kernel_pg_dir[i];
|
|
pmd_t *pmd_dir;
|
|
|
|
if (!pud_present(*pud))
|
|
continue;
|
|
|
|
pmd_dir = (pmd_t *)pgd_page_vaddr(kernel_pg_dir[i]);
|
|
init_pointer_table(pmd_dir, TABLE_PMD);
|
|
|
|
for (j = 0; j < PTRS_PER_PMD; j++) {
|
|
pmd_t *pmd = &pmd_dir[j];
|
|
pte_t *pte_dir;
|
|
|
|
if (!pmd_present(*pmd))
|
|
continue;
|
|
|
|
pte_dir = (pte_t *)pmd_page_vaddr(*pmd);
|
|
init_pointer_table(pte_dir, TABLE_PTE);
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void __init mem_init(void)
|
|
{
|
|
/* this will put all memory onto the freelists */
|
|
memblock_free_all();
|
|
init_pointer_tables();
|
|
}
|