mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-09-04 20:19:47 +08:00

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>
46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* OpenRISC ioremap.c
|
|
*
|
|
* Linux architectural port borrowing liberally from similar works of
|
|
* others. All original copyrights apply as per the original source
|
|
* declaration.
|
|
*
|
|
* Modifications for the OpenRISC architecture:
|
|
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
|
|
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
|
|
*/
|
|
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/io.h>
|
|
#include <linux/pgtable.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/fixmap.h>
|
|
#include <asm/bug.h>
|
|
#include <linux/sched.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
extern int mem_init_done;
|
|
|
|
/*
|
|
* OK, this one's a bit tricky... ioremap can get called before memory is
|
|
* initialized (early serial console does this) and will want to alloc a page
|
|
* for its mapping. No userspace pages will ever get allocated before memory
|
|
* is initialized so this applies only to kernel pages. In the event that
|
|
* this is called before memory is initialized we allocate the page using
|
|
* the memblock infrastructure.
|
|
*/
|
|
|
|
pte_t __ref *pte_alloc_one_kernel(struct mm_struct *mm)
|
|
{
|
|
pte_t *pte;
|
|
|
|
if (likely(mem_init_done)) {
|
|
pte = (pte_t *)get_zeroed_page(GFP_KERNEL);
|
|
} else {
|
|
pte = memblock_alloc_or_panic(PAGE_SIZE, PAGE_SIZE);
|
|
}
|
|
|
|
return pte;
|
|
}
|