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https://github.com/torvalds/linux
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e31cf2f4ca
Patch series "mm: consolidate definitions of page table accessors", v2.
The low level page table accessors (pXY_index(), pXY_offset()) are
duplicated across all architectures and sometimes more than once. For
instance, we have 31 definition of pgd_offset() for 25 supported
architectures.
Most of these definitions are actually identical and typically it boils
down to, e.g.
static inline unsigned long pmd_index(unsigned long address)
{
return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
}
static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
{
return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
}
These definitions can be shared among 90% of the arches provided
XYZ_SHIFT, PTRS_PER_XYZ and xyz_page_vaddr() are defined.
For architectures that really need a custom version there is always
possibility to override the generic version with the usual ifdefs magic.
These patches introduce include/linux/pgtable.h that replaces
include/asm-generic/pgtable.h and add the definitions of the page table
accessors to the new header.
This patch (of 12):
The linux/mm.h header includes <asm/pgtable.h> to allow inlining of the
functions involving page table manipulations, e.g. pte_alloc() and
pmd_alloc(). So, there is no point to explicitly include <asm/pgtable.h>
in the files that include <linux/mm.h>.
The include statements in such cases are remove with a simple loop:
for f in $(git grep -l "include <linux/mm.h>") ; do
sed -i -e '/include <asm\/pgtable.h>/ d' $f
done
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Cain <bcain@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: Guo Ren <guoren@kernel.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Mark Salter <msalter@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nick Hu <nickhu@andestech.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vincent Chen <deanbo422@gmail.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: http://lkml.kernel.org/r/20200514170327.31389-1-rppt@kernel.org
Link: http://lkml.kernel.org/r/20200514170327.31389-2-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
108 lines
2.1 KiB
C
108 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org),
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* derived from r4xx0.c by David S. Miller (davem@davemloft.net).
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <asm/mipsregs.h>
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#include <asm/bcache.h>
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#include <asm/cacheops.h>
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#include <asm/page.h>
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#include <asm/mmu_context.h>
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#include <asm/r4kcache.h>
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/* Secondary cache size in bytes, if present. */
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static unsigned long scache_size;
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#define SC_LINE 32
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#define SC_PAGE (128*SC_LINE)
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static inline void blast_r5000_scache(void)
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{
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unsigned long start = INDEX_BASE;
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unsigned long end = start + scache_size;
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while(start < end) {
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cache_op(R5K_Page_Invalidate_S, start);
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start += SC_PAGE;
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}
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}
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static void r5k_dma_cache_inv_sc(unsigned long addr, unsigned long size)
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{
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unsigned long end, a;
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/* Catch bad driver code */
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BUG_ON(size == 0);
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if (size >= scache_size) {
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blast_r5000_scache();
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return;
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}
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/* On the R5000 secondary cache we cannot
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* invalidate less than a page at a time.
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* The secondary cache is physically indexed, write-through.
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*/
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a = addr & ~(SC_PAGE - 1);
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end = (addr + size - 1) & ~(SC_PAGE - 1);
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while (a <= end) {
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cache_op(R5K_Page_Invalidate_S, a);
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a += SC_PAGE;
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}
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}
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static void r5k_sc_enable(void)
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{
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unsigned long flags;
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local_irq_save(flags);
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set_c0_config(R5K_CONF_SE);
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blast_r5000_scache();
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local_irq_restore(flags);
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}
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static void r5k_sc_disable(void)
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{
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unsigned long flags;
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local_irq_save(flags);
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blast_r5000_scache();
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clear_c0_config(R5K_CONF_SE);
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local_irq_restore(flags);
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}
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static inline int __init r5k_sc_probe(void)
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{
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unsigned long config = read_c0_config();
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if (config & CONF_SC)
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return 0;
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scache_size = (512 * 1024) << ((config & R5K_CONF_SS) >> 20);
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printk("R5000 SCACHE size %ldkB, linesize 32 bytes.\n",
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scache_size >> 10);
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return 1;
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}
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static struct bcache_ops r5k_sc_ops = {
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.bc_enable = r5k_sc_enable,
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.bc_disable = r5k_sc_disable,
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.bc_wback_inv = r5k_dma_cache_inv_sc,
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.bc_inv = r5k_dma_cache_inv_sc
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};
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void r5k_sc_init(void)
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{
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if (r5k_sc_probe()) {
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r5k_sc_enable();
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bcops = &r5k_sc_ops;
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}
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}
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