mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-04 09:06:55 +07:00
72a7fe3967
This patchset adds a flags variable to reserve_bootmem() and uses the BOOTMEM_EXCLUSIVE flag in crashkernel reservation code to detect collisions between crashkernel area and already used memory. This patch: Change the reserve_bootmem() function to accept a new flag BOOTMEM_EXCLUSIVE. If that flag is set, the function returns with -EBUSY if the memory already has been reserved in the past. This is to avoid conflicts. Because that code runs before SMP initialisation, there's no race condition inside reserve_bootmem_core(). [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: fix powerpc build] Signed-off-by: Bernhard Walle <bwalle@suse.de> Cc: <linux-arch@vger.kernel.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
88 lines
2.0 KiB
C
88 lines
2.0 KiB
C
/*
|
|
* linux/arch/arm/mm/nommu.c
|
|
*
|
|
* ARM uCLinux supporting functions.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/bootmem.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/io.h>
|
|
#include <asm/page.h>
|
|
#include <asm/mach/arch.h>
|
|
|
|
#include "mm.h"
|
|
|
|
extern void _stext, __data_start, _end;
|
|
|
|
/*
|
|
* Reserve the various regions of node 0
|
|
*/
|
|
void __init reserve_node_zero(pg_data_t *pgdat)
|
|
{
|
|
/*
|
|
* Register the kernel text and data with bootmem.
|
|
* Note that this can only be in node 0.
|
|
*/
|
|
#ifdef CONFIG_XIP_KERNEL
|
|
reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start,
|
|
BOOTMEM_DEFAULT);
|
|
#else
|
|
reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext,
|
|
BOOTMEM_DEFAULT);
|
|
#endif
|
|
|
|
/*
|
|
* Register the exception vector page.
|
|
* some architectures which the DRAM is the exception vector to trap,
|
|
* alloc_page breaks with error, although it is not NULL, but "0."
|
|
*/
|
|
reserve_bootmem_node(pgdat, CONFIG_VECTORS_BASE, PAGE_SIZE,
|
|
BOOTMEM_DEFAULT);
|
|
}
|
|
|
|
/*
|
|
* paging_init() sets up the page tables, initialises the zone memory
|
|
* maps, and sets up the zero page, bad page and bad page tables.
|
|
*/
|
|
void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc)
|
|
{
|
|
bootmem_init(mi);
|
|
}
|
|
|
|
/*
|
|
* We don't need to do anything here for nommu machines.
|
|
*/
|
|
void setup_mm_for_reboot(char mode)
|
|
{
|
|
}
|
|
|
|
void flush_dcache_page(struct page *page)
|
|
{
|
|
__cpuc_flush_dcache_page(page_address(page));
|
|
}
|
|
EXPORT_SYMBOL(flush_dcache_page);
|
|
|
|
void __iomem *__arm_ioremap_pfn(unsigned long pfn, unsigned long offset,
|
|
size_t size, unsigned int mtype)
|
|
{
|
|
if (pfn >= (0x100000000ULL >> PAGE_SHIFT))
|
|
return NULL;
|
|
return (void __iomem *) (offset + (pfn << PAGE_SHIFT));
|
|
}
|
|
EXPORT_SYMBOL(__arm_ioremap_pfn);
|
|
|
|
void __iomem *__arm_ioremap(unsigned long phys_addr, size_t size,
|
|
unsigned int mtype)
|
|
{
|
|
return (void __iomem *)phys_addr;
|
|
}
|
|
EXPORT_SYMBOL(__arm_ioremap);
|
|
|
|
void __iounmap(volatile void __iomem *addr)
|
|
{
|
|
}
|
|
EXPORT_SYMBOL(__iounmap);
|