linux_dsm_epyc7002/arch/riscv/include/asm/fixmap.h
Anup Patel ff0e2a7bd1
RISC-V: Fix FIXMAP_TOP to avoid overlap with VMALLOC area
The FIXMAP area overlaps with VMALLOC area in Linux-5.1-rc1 hence we get
below warning in Linux RISC-V 32bit kernel. This warning does not show-up
in Linux RISC-V 64bit kernel due to large VMALLOC area.

WARNING: CPU: 0 PID: 22 at mm/vmalloc.c:150 vmap_page_range_noflush+0x134/0x15c
Modules linked in:
CPU: 0 PID: 22 Comm: kworker/0:1 Not tainted 5.1.0-rc1-00005-gebc2f658040e #1
Workqueue: events pcpu_balance_workfn
Call Trace:
[<c002b950>] walk_stackframe+0x0/0xa0
[<c002baac>] show_stack+0x28/0x32
[<c0587354>] dump_stack+0x62/0x7e
[<c002fdee>] __warn+0x98/0xce
[<c002fe52>] warn_slowpath_null+0x2e/0x3c
[<c00e71ce>] vmap_page_range_noflush+0x134/0x15c
[<c00e7886>] map_kernel_range_noflush+0xc/0x14
[<c00d54b8>] pcpu_populate_chunk+0x19e/0x236
[<c00d610e>] pcpu_balance_workfn+0x448/0x464
[<c00408d6>] process_one_work+0x16c/0x2ea
[<c0040b46>] worker_thread+0xf2/0x3b2
[<c004519a>] kthread+0xce/0xdc
[<c002a974>] ret_from_exception+0x0/0xc

This patch fixes above warning by placing FIXMAP area below VMALLOC area.

Fixes: f2c17aabc9 ("RISC-V: Implement compile-time fixed mappings")
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-03-28 23:16:04 -07:00

45 lines
1.2 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2019 Western Digital Corporation or its affiliates.
*/
#ifndef _ASM_RISCV_FIXMAP_H
#define _ASM_RISCV_FIXMAP_H
#include <linux/kernel.h>
#include <linux/sizes.h>
#include <asm/page.h>
#include <asm/pgtable.h>
/*
* Here we define all the compile-time 'special' virtual addresses.
* The point is to have a constant address at compile time, but to
* set the physical address only in the boot process.
*
* These 'compile-time allocated' memory buffers are page-sized. Use
* set_fixmap(idx,phys) to associate physical memory with fixmap indices.
*/
enum fixed_addresses {
FIX_HOLE,
FIX_EARLYCON_MEM_BASE,
__end_of_fixed_addresses
};
#define FIXADDR_SIZE (__end_of_fixed_addresses * PAGE_SIZE)
#define FIXADDR_TOP (VMALLOC_START)
#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
#define FIXMAP_PAGE_IO PAGE_KERNEL
#define __early_set_fixmap __set_fixmap
#define __late_set_fixmap __set_fixmap
#define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR)
extern void __set_fixmap(enum fixed_addresses idx,
phys_addr_t phys, pgprot_t prot);
#include <asm-generic/fixmap.h>
#endif /* _ASM_RISCV_FIXMAP_H */