mirror of
https://github.com/torvalds/linux
synced 2024-10-16 16:29:20 +00:00
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>
227 lines
6.2 KiB
C
227 lines
6.2 KiB
C
/*
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* Copyright (C) 1995 Linus Torvalds
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*
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* Pentium III FXSR, SSE support
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* Gareth Hughes <gareth@valinux.com>, May 2000
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*/
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/*
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* This file handles the architecture-dependent parts of process handling..
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*/
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#include <linux/cpu.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/sched/task.h>
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#include <linux/sched/task_stack.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/elfcore.h>
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#include <linux/smp.h>
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#include <linux/stddef.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/user.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/reboot.h>
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#include <linux/mc146818rtc.h>
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#include <linux/export.h>
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#include <linux/kallsyms.h>
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#include <linux/ptrace.h>
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#include <linux/personality.h>
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#include <linux/percpu.h>
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#include <linux/prctl.h>
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#include <linux/ftrace.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <linux/kdebug.h>
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#include <linux/syscalls.h>
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#include <asm/ldt.h>
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#include <asm/processor.h>
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#include <asm/fpu/internal.h>
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#include <asm/desc.h>
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#include <linux/err.h>
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#include <asm/tlbflush.h>
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#include <asm/cpu.h>
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#include <asm/debugreg.h>
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#include <asm/switch_to.h>
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#include <asm/vm86.h>
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#include <asm/resctrl.h>
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#include <asm/proto.h>
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#include "process.h"
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void __show_regs(struct pt_regs *regs, enum show_regs_mode mode)
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{
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unsigned long cr0 = 0L, cr2 = 0L, cr3 = 0L, cr4 = 0L;
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unsigned long d0, d1, d2, d3, d6, d7;
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unsigned short gs;
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if (user_mode(regs))
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gs = get_user_gs(regs);
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else
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savesegment(gs, gs);
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show_ip(regs, KERN_DEFAULT);
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printk(KERN_DEFAULT "EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
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regs->ax, regs->bx, regs->cx, regs->dx);
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printk(KERN_DEFAULT "ESI: %08lx EDI: %08lx EBP: %08lx ESP: %08lx\n",
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regs->si, regs->di, regs->bp, regs->sp);
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printk(KERN_DEFAULT "DS: %04x ES: %04x FS: %04x GS: %04x SS: %04x EFLAGS: %08lx\n",
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(u16)regs->ds, (u16)regs->es, (u16)regs->fs, gs, regs->ss, regs->flags);
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if (mode != SHOW_REGS_ALL)
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return;
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cr0 = read_cr0();
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cr2 = read_cr2();
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cr3 = __read_cr3();
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cr4 = __read_cr4();
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printk(KERN_DEFAULT "CR0: %08lx CR2: %08lx CR3: %08lx CR4: %08lx\n",
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cr0, cr2, cr3, cr4);
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get_debugreg(d0, 0);
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get_debugreg(d1, 1);
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get_debugreg(d2, 2);
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get_debugreg(d3, 3);
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get_debugreg(d6, 6);
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get_debugreg(d7, 7);
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/* Only print out debug registers if they are in their non-default state. */
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if ((d0 == 0) && (d1 == 0) && (d2 == 0) && (d3 == 0) &&
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(d6 == DR6_RESERVED) && (d7 == 0x400))
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return;
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printk(KERN_DEFAULT "DR0: %08lx DR1: %08lx DR2: %08lx DR3: %08lx\n",
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d0, d1, d2, d3);
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printk(KERN_DEFAULT "DR6: %08lx DR7: %08lx\n",
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d6, d7);
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}
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void release_thread(struct task_struct *dead_task)
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{
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BUG_ON(dead_task->mm);
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release_vm86_irqs(dead_task);
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}
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void
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start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp)
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{
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set_user_gs(regs, 0);
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regs->fs = 0;
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regs->ds = __USER_DS;
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regs->es = __USER_DS;
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regs->ss = __USER_DS;
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regs->cs = __USER_CS;
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regs->ip = new_ip;
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regs->sp = new_sp;
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regs->flags = X86_EFLAGS_IF;
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}
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EXPORT_SYMBOL_GPL(start_thread);
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/*
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* switch_to(x,y) should switch tasks from x to y.
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*
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* We fsave/fwait so that an exception goes off at the right time
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* (as a call from the fsave or fwait in effect) rather than to
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* the wrong process. Lazy FP saving no longer makes any sense
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* with modern CPU's, and this simplifies a lot of things (SMP
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* and UP become the same).
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*
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* NOTE! We used to use the x86 hardware context switching. The
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* reason for not using it any more becomes apparent when you
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* try to recover gracefully from saved state that is no longer
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* valid (stale segment register values in particular). With the
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* hardware task-switch, there is no way to fix up bad state in
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* a reasonable manner.
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*
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* The fact that Intel documents the hardware task-switching to
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* be slow is a fairly red herring - this code is not noticeably
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* faster. However, there _is_ some room for improvement here,
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* so the performance issues may eventually be a valid point.
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* More important, however, is the fact that this allows us much
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* more flexibility.
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*
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* The return value (in %ax) will be the "prev" task after
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* the task-switch, and shows up in ret_from_fork in entry.S,
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* for example.
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*/
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__visible __notrace_funcgraph struct task_struct *
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__switch_to(struct task_struct *prev_p, struct task_struct *next_p)
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{
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struct thread_struct *prev = &prev_p->thread,
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*next = &next_p->thread;
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struct fpu *prev_fpu = &prev->fpu;
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struct fpu *next_fpu = &next->fpu;
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int cpu = smp_processor_id();
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/* never put a printk in __switch_to... printk() calls wake_up*() indirectly */
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if (!test_thread_flag(TIF_NEED_FPU_LOAD))
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switch_fpu_prepare(prev_fpu, cpu);
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/*
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* Save away %gs. No need to save %fs, as it was saved on the
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* stack on entry. No need to save %es and %ds, as those are
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* always kernel segments while inside the kernel. Doing this
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* before setting the new TLS descriptors avoids the situation
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* where we temporarily have non-reloadable segments in %fs
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* and %gs. This could be an issue if the NMI handler ever
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* used %fs or %gs (it does not today), or if the kernel is
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* running inside of a hypervisor layer.
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*/
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lazy_save_gs(prev->gs);
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/*
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* Load the per-thread Thread-Local Storage descriptor.
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*/
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load_TLS(next, cpu);
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switch_to_extra(prev_p, next_p);
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/*
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* Leave lazy mode, flushing any hypercalls made here.
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* This must be done before restoring TLS segments so
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* the GDT and LDT are properly updated.
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*/
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arch_end_context_switch(next_p);
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/*
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* Reload esp0 and cpu_current_top_of_stack. This changes
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* current_thread_info(). Refresh the SYSENTER configuration in
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* case prev or next is vm86.
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*/
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update_task_stack(next_p);
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refresh_sysenter_cs(next);
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this_cpu_write(cpu_current_top_of_stack,
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(unsigned long)task_stack_page(next_p) +
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THREAD_SIZE);
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/*
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* Restore %gs if needed (which is common)
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*/
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if (prev->gs | next->gs)
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lazy_load_gs(next->gs);
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this_cpu_write(current_task, next_p);
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switch_fpu_finish(next_fpu);
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/* Load the Intel cache allocation PQR MSR. */
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resctrl_sched_in();
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return prev_p;
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}
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SYSCALL_DEFINE2(arch_prctl, int, option, unsigned long, arg2)
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{
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return do_arch_prctl_common(current, option, arg2);
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}
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