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>
93 lines
2 KiB
C
93 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __PARISC_MMU_CONTEXT_H
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#define __PARISC_MMU_CONTEXT_H
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/atomic.h>
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#include <asm-generic/mm_hooks.h>
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static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
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{
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}
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/* on PA-RISC, we actually have enough contexts to justify an allocator
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* for them. prumpf */
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extern unsigned long alloc_sid(void);
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extern void free_sid(unsigned long);
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static inline int
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init_new_context(struct task_struct *tsk, struct mm_struct *mm)
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{
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BUG_ON(atomic_read(&mm->mm_users) != 1);
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mm->context = alloc_sid();
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return 0;
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}
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static inline void
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destroy_context(struct mm_struct *mm)
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{
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free_sid(mm->context);
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mm->context = 0;
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}
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static inline unsigned long __space_to_prot(mm_context_t context)
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{
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#if SPACEID_SHIFT == 0
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return context << 1;
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#else
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return context >> (SPACEID_SHIFT - 1);
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#endif
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}
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static inline void load_context(mm_context_t context)
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{
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mtsp(context, 3);
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mtctl(__space_to_prot(context), 8);
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}
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static inline void switch_mm_irqs_off(struct mm_struct *prev,
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struct mm_struct *next, struct task_struct *tsk)
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{
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if (prev != next) {
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mtctl(__pa(next->pgd), 25);
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load_context(next->context);
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}
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}
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static inline void switch_mm(struct mm_struct *prev,
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struct mm_struct *next, struct task_struct *tsk)
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{
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unsigned long flags;
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if (prev == next)
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return;
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local_irq_save(flags);
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switch_mm_irqs_off(prev, next, tsk);
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local_irq_restore(flags);
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}
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#define switch_mm_irqs_off switch_mm_irqs_off
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#define deactivate_mm(tsk,mm) do { } while (0)
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static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
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{
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/*
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* Activate_mm is our one chance to allocate a space id
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* for a new mm created in the exec path. There's also
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* some lazy tlb stuff, which is currently dead code, but
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* we only allocate a space id if one hasn't been allocated
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* already, so we should be OK.
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*/
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BUG_ON(next == &init_mm); /* Should never happen */
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if (next->context == 0)
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next->context = alloc_sid();
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switch_mm(prev,next,current);
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}
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#endif
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