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>
104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* TLB shootdown specifics for powerpc
|
|
*
|
|
* Copyright (C) 2002 Anton Blanchard, IBM Corp.
|
|
* Copyright (C) 2002 Paul Mackerras, IBM Corp.
|
|
*/
|
|
#ifndef _ASM_POWERPC_TLB_H
|
|
#define _ASM_POWERPC_TLB_H
|
|
#ifdef __KERNEL__
|
|
|
|
#ifndef __powerpc64__
|
|
#include <linux/pgtable.h>
|
|
#endif
|
|
#ifndef __powerpc64__
|
|
#include <asm/page.h>
|
|
#include <asm/mmu.h>
|
|
#endif
|
|
|
|
#include <linux/pagemap.h>
|
|
|
|
#define tlb_start_vma(tlb, vma) do { } while (0)
|
|
#define tlb_end_vma(tlb, vma) do { } while (0)
|
|
#define __tlb_remove_tlb_entry __tlb_remove_tlb_entry
|
|
|
|
#define tlb_flush tlb_flush
|
|
extern void tlb_flush(struct mmu_gather *tlb);
|
|
/*
|
|
* book3s:
|
|
* Hash does not use the linux page-tables, so we can avoid
|
|
* the TLB invalidate for page-table freeing, Radix otoh does use the
|
|
* page-tables and needs the TLBI.
|
|
*
|
|
* nohash:
|
|
* We still do TLB invalidate in the __pte_free_tlb routine before we
|
|
* add the page table pages to mmu gather table batch.
|
|
*/
|
|
#define tlb_needs_table_invalidate() radix_enabled()
|
|
|
|
/* Get the generic bits... */
|
|
#include <asm-generic/tlb.h>
|
|
|
|
extern void flush_hash_entry(struct mm_struct *mm, pte_t *ptep,
|
|
unsigned long address);
|
|
|
|
static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
|
|
unsigned long address)
|
|
{
|
|
#ifdef CONFIG_PPC_BOOK3S_32
|
|
if (pte_val(*ptep) & _PAGE_HASHPTE)
|
|
flush_hash_entry(tlb->mm, ptep, address);
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
static inline int mm_is_core_local(struct mm_struct *mm)
|
|
{
|
|
return cpumask_subset(mm_cpumask(mm),
|
|
topology_sibling_cpumask(smp_processor_id()));
|
|
}
|
|
|
|
#ifdef CONFIG_PPC_BOOK3S_64
|
|
static inline int mm_is_thread_local(struct mm_struct *mm)
|
|
{
|
|
if (atomic_read(&mm->context.active_cpus) > 1)
|
|
return false;
|
|
return cpumask_test_cpu(smp_processor_id(), mm_cpumask(mm));
|
|
}
|
|
static inline void mm_reset_thread_local(struct mm_struct *mm)
|
|
{
|
|
WARN_ON(atomic_read(&mm->context.copros) > 0);
|
|
/*
|
|
* It's possible for mm_access to take a reference on mm_users to
|
|
* access the remote mm from another thread, but it's not allowed
|
|
* to set mm_cpumask, so mm_users may be > 1 here.
|
|
*/
|
|
WARN_ON(current->mm != mm);
|
|
atomic_set(&mm->context.active_cpus, 1);
|
|
cpumask_clear(mm_cpumask(mm));
|
|
cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
|
|
}
|
|
#else /* CONFIG_PPC_BOOK3S_64 */
|
|
static inline int mm_is_thread_local(struct mm_struct *mm)
|
|
{
|
|
return cpumask_equal(mm_cpumask(mm),
|
|
cpumask_of(smp_processor_id()));
|
|
}
|
|
#endif /* !CONFIG_PPC_BOOK3S_64 */
|
|
|
|
#else /* CONFIG_SMP */
|
|
static inline int mm_is_core_local(struct mm_struct *mm)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static inline int mm_is_thread_local(struct mm_struct *mm)
|
|
{
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* __ASM_POWERPC_TLB_H */
|