mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-15 00:04:15 +08:00
ca15ca406f
Patch series "mm: cleanup usage of <asm/pgalloc.h>"
Most architectures have very similar versions of pXd_alloc_one() and
pXd_free_one() for intermediate levels of page table. These patches add
generic versions of these functions in <asm-generic/pgalloc.h> and enable
use of the generic functions where appropriate.
In addition, functions declared and defined in <asm/pgalloc.h> headers are
used mostly by core mm and early mm initialization in arch and there is no
actual reason to have the <asm/pgalloc.h> included all over the place.
The first patch in this series removes unneeded includes of
<asm/pgalloc.h>
In the end it didn't work out as neatly as I hoped and moving
pXd_alloc_track() definitions to <asm-generic/pgalloc.h> would require
unnecessary changes to arches that have custom page table allocations, so
I've decided to move lib/ioremap.c to mm/ and make pgalloc-track.h local
to mm/.
This patch (of 8):
In most cases <asm/pgalloc.h> header is required only for allocations of
page table memory. Most of the .c files that include that header do not
use symbols declared in <asm/pgalloc.h> and do not require that header.
As for the other header files that used to include <asm/pgalloc.h>, it is
possible to move that include into the .c file that actually uses symbols
from <asm/pgalloc.h> and drop the include from the header file.
The process was somewhat automated using
sed -i -E '/[<"]asm\/pgalloc\.h/d' \
$(grep -L -w -f /tmp/xx \
$(git grep -E -l '[<"]asm/pgalloc\.h'))
where /tmp/xx contains all the symbols defined in
arch/*/include/asm/pgalloc.h.
[rppt@linux.ibm.com: fix powerpc warning]
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k]
Cc: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Matthew Wilcox <willy@infradead.org>
Link: http://lkml.kernel.org/r/20200627143453.31835-1-rppt@kernel.org
Link: http://lkml.kernel.org/r/20200627143453.31835-2-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
105 lines
2.3 KiB
C
105 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/nmi.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
#include <asm/cpu_entry_area.h>
|
|
#include <asm/fixmap.h>
|
|
#include <asm/e820/api.h>
|
|
#include <asm/tlb.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/io.h>
|
|
#include <linux/vmalloc.h>
|
|
|
|
unsigned int __VMALLOC_RESERVE = 128 << 20;
|
|
|
|
/*
|
|
* Associate a virtual page frame with a given physical page frame
|
|
* and protection flags for that frame.
|
|
*/
|
|
void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
|
|
{
|
|
pgd_t *pgd;
|
|
p4d_t *p4d;
|
|
pud_t *pud;
|
|
pmd_t *pmd;
|
|
pte_t *pte;
|
|
|
|
pgd = swapper_pg_dir + pgd_index(vaddr);
|
|
if (pgd_none(*pgd)) {
|
|
BUG();
|
|
return;
|
|
}
|
|
p4d = p4d_offset(pgd, vaddr);
|
|
if (p4d_none(*p4d)) {
|
|
BUG();
|
|
return;
|
|
}
|
|
pud = pud_offset(p4d, vaddr);
|
|
if (pud_none(*pud)) {
|
|
BUG();
|
|
return;
|
|
}
|
|
pmd = pmd_offset(pud, vaddr);
|
|
if (pmd_none(*pmd)) {
|
|
BUG();
|
|
return;
|
|
}
|
|
pte = pte_offset_kernel(pmd, vaddr);
|
|
if (!pte_none(pteval))
|
|
set_pte_at(&init_mm, vaddr, pte, pteval);
|
|
else
|
|
pte_clear(&init_mm, vaddr, pte);
|
|
|
|
/*
|
|
* It's enough to flush this one mapping.
|
|
* (PGE mappings get flushed as well)
|
|
*/
|
|
flush_tlb_one_kernel(vaddr);
|
|
}
|
|
|
|
unsigned long __FIXADDR_TOP = 0xfffff000;
|
|
EXPORT_SYMBOL(__FIXADDR_TOP);
|
|
|
|
/*
|
|
* vmalloc=size forces the vmalloc area to be exactly 'size'
|
|
* bytes. This can be used to increase (or decrease) the
|
|
* vmalloc area - the default is 128m.
|
|
*/
|
|
static int __init parse_vmalloc(char *arg)
|
|
{
|
|
if (!arg)
|
|
return -EINVAL;
|
|
|
|
/* Add VMALLOC_OFFSET to the parsed value due to vm area guard hole*/
|
|
__VMALLOC_RESERVE = memparse(arg, &arg) + VMALLOC_OFFSET;
|
|
return 0;
|
|
}
|
|
early_param("vmalloc", parse_vmalloc);
|
|
|
|
/*
|
|
* reservetop=size reserves a hole at the top of the kernel address space which
|
|
* a hypervisor can load into later. Needed for dynamically loaded hypervisors,
|
|
* so relocating the fixmap can be done before paging initialization.
|
|
*/
|
|
static int __init parse_reservetop(char *arg)
|
|
{
|
|
unsigned long address;
|
|
|
|
if (!arg)
|
|
return -EINVAL;
|
|
|
|
address = memparse(arg, &arg);
|
|
reserve_top_address(address);
|
|
early_ioremap_init();
|
|
return 0;
|
|
}
|
|
early_param("reservetop", parse_reservetop);
|