mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-14 06:35:12 +00:00
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>
100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* arch/parisc/mm/ioremap.c
|
|
*
|
|
* (C) Copyright 1995 1996 Linus Torvalds
|
|
* (C) Copyright 2001-2019 Helge Deller <deller@gmx.de>
|
|
* (C) Copyright 2005 Kyle McMartin <kyle@parisc-linux.org>
|
|
*/
|
|
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/module.h>
|
|
#include <linux/io.h>
|
|
#include <linux/mm.h>
|
|
|
|
/*
|
|
* Generic mapping function (not visible outside):
|
|
*/
|
|
|
|
/*
|
|
* Remap an arbitrary physical address space into the kernel virtual
|
|
* address space.
|
|
*
|
|
* NOTE! We need to allow non-page-aligned mappings too: we will obviously
|
|
* have to convert them into an offset in a page-aligned mapping, but the
|
|
* caller shouldn't need to know that small detail.
|
|
*/
|
|
void __iomem *ioremap(unsigned long phys_addr, unsigned long size)
|
|
{
|
|
void __iomem *addr;
|
|
struct vm_struct *area;
|
|
unsigned long offset, last_addr;
|
|
pgprot_t pgprot;
|
|
|
|
#ifdef CONFIG_EISA
|
|
unsigned long end = phys_addr + size - 1;
|
|
/* Support EISA addresses */
|
|
if ((phys_addr >= 0x00080000 && end < 0x000fffff) ||
|
|
(phys_addr >= 0x00500000 && end < 0x03bfffff))
|
|
phys_addr |= F_EXTEND(0xfc000000);
|
|
#endif
|
|
|
|
/* Don't allow wraparound or zero size */
|
|
last_addr = phys_addr + size - 1;
|
|
if (!size || last_addr < phys_addr)
|
|
return NULL;
|
|
|
|
/*
|
|
* Don't allow anybody to remap normal RAM that we're using..
|
|
*/
|
|
if (phys_addr < virt_to_phys(high_memory)) {
|
|
char *t_addr, *t_end;
|
|
struct page *page;
|
|
|
|
t_addr = __va(phys_addr);
|
|
t_end = t_addr + (size - 1);
|
|
|
|
for (page = virt_to_page(t_addr);
|
|
page <= virt_to_page(t_end); page++) {
|
|
if(!PageReserved(page))
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
pgprot = __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY |
|
|
_PAGE_ACCESSED | _PAGE_NO_CACHE);
|
|
|
|
/*
|
|
* Mappings have to be page-aligned
|
|
*/
|
|
offset = phys_addr & ~PAGE_MASK;
|
|
phys_addr &= PAGE_MASK;
|
|
size = PAGE_ALIGN(last_addr + 1) - phys_addr;
|
|
|
|
/*
|
|
* Ok, go for it..
|
|
*/
|
|
area = get_vm_area(size, VM_IOREMAP);
|
|
if (!area)
|
|
return NULL;
|
|
|
|
addr = (void __iomem *) area->addr;
|
|
if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size,
|
|
phys_addr, pgprot)) {
|
|
vunmap(addr);
|
|
return NULL;
|
|
}
|
|
|
|
return (void __iomem *) (offset + (char __iomem *)addr);
|
|
}
|
|
EXPORT_SYMBOL(ioremap);
|
|
|
|
void iounmap(const volatile void __iomem *io_addr)
|
|
{
|
|
unsigned long addr = (unsigned long)io_addr & PAGE_MASK;
|
|
|
|
if (is_vmalloc_addr((void *)addr))
|
|
vunmap((void *)addr);
|
|
}
|
|
EXPORT_SYMBOL(iounmap);
|