FM / asm-generic

/usr/src/linux-headers-5.15.0-190/include/asm-generic/

/usr/src/linux-headers-5.15.0-190/include/asm-generic

Name	Size	Mode	Actions
bitops/	-	0755	rm
vdso/	-	0755	rm
asm-offsets.h	35	0644	edit dl rm
asm-prototypes.h	507	0644	edit dl rm
atomic.h	3569	0644	edit dl rm
atomic64.h	2549	0644	edit dl rm
audit_change_attr.h	529	0644	edit dl rm
audit_dir_write.h	528	0644	edit dl rm
audit_read.h	337	0644	edit dl rm
audit_signal.h	36	0644	edit dl rm
audit_write.h	461	0644	edit dl rm
barrier.h	6518	0644	edit dl rm
bitops.h	1197	0644	edit dl rm
bitsperlong.h	1207	0644	edit dl rm
bug.h	6939	0644	edit dl rm
cache.h	384	0644	edit dl rm
cacheflush.h	2401	0644	edit dl rm
checksum.h	1634	0644	edit dl rm
cmpxchg-local.h	1464	0644	edit dl rm
cmpxchg.h	2440	0644	edit dl rm
compat.h	1190	0644	edit dl rm
current.h	256	0644	edit dl rm
delay.h	1157	0644	edit dl rm
device.h	245	0644	edit dl rm
div64.h	7437	0644	edit dl rm
dma-mapping.h	248	0644	edit dl rm
dma.h	553	0644	edit dl rm
early_ioremap.h	1501	0644	edit dl rm
emergency-restart.h	248	0644	edit dl rm
error-injection.h	1162	0644	edit dl rm
exec.h	460	0644	edit dl rm
export.h	2344	0644	edit dl rm
extable.h	802	0644	edit dl rm
fb.h	271	0644	edit dl rm
fixmap.h	2932	0644	edit dl rm
flat.h	610	0644	edit dl rm
ftrace.h	314	0644	edit dl rm
futex.h	2669	0644	edit dl rm
getorder.h	1262	0644	edit dl rm
gpio.h	4537	0644	edit dl rm
hardirq.h	568	0644	edit dl rm
hugetlb.h	3030	0644	edit dl rm
hw_irq.h	270	0644	edit dl rm
hyperv-tlfs.h	19828	0644	edit dl rm
ide_iops.h	791	0644	edit dl rm
int-ll64.h	863	0644	edit dl rm
io.h	23436	0644	edit dl rm
ioctl.h	506	0644	edit dl rm
iomap.h	4019	0644	edit dl rm
irq.h	403	0644	edit dl rm
irqflags.h	1543	0644	edit dl rm
irq_regs.h	773	0644	edit dl rm
irq_work.h	194	0644	edit dl rm
Kbuild	1643	0644	edit dl rm
kdebug.h	182	0644	edit dl rm
kmap_size.h	263	0644	edit dl rm
kprobes.h	833	0644	edit dl rm
kvm_para.h	549	0644	edit dl rm
kvm_types.h	113	0644	edit dl rm
linkage.h	225	0644	edit dl rm
local.h	2282	0644	edit dl rm
local64.h	3887	0644	edit dl rm
logic_io.h	2402	0644	edit dl rm
mcs_spinlock.h	260	0644	edit dl rm
memory_model.h	1441	0644	edit dl rm
mmiowb.h	1764	0644	edit dl rm
mmiowb_types.h	249	0644	edit dl rm
mmu.h	449	0644	edit dl rm
mmu_context.h	1654	0644	edit dl rm
mm_hooks.h	753	0644	edit dl rm
module.h	1118	0644	edit dl rm
module.lds.h	278	0644	edit dl rm
mshyperv.h	7727	0644	edit dl rm
msi.h	1053	0644	edit dl rm
nommu_context.h	420	0644	edit dl rm
numa.h	1642	0644	edit dl rm
page.h	2351	0644	edit dl rm
param.h	367	0644	edit dl rm
parport.h	604	0644	edit dl rm
pci.h	401	0644	edit dl rm
pci_iomap.h	1920	0644	edit dl rm
percpu.h	12957	0644	edit dl rm
pgalloc.h	4747	0644	edit dl rm
pgtable-nop4d.h	1758	0644	edit dl rm
pgtable-nopmd.h	1980	0644	edit dl rm
pgtable-nopud.h	1995	0644	edit dl rm
pgtable_uffd.h	1052	0644	edit dl rm
preempt.h	1995	0644	edit dl rm
qrwlock.h	3859	0644	edit dl rm
qrwlock_types.h	682	0644	edit dl rm
qspinlock.h	3354	0644	edit dl rm
qspinlock_types.h	2134	0644	edit dl rm
resource.h	1100	0644	edit dl rm
rwonce.h	2932	0644	edit dl rm
seccomp.h	1187	0644	edit dl rm
sections.h	6104	0644	edit dl rm
serial.h	345	0644	edit dl rm
set_memory.h	362	0644	edit dl rm
shmparam.h	207	0644	edit dl rm
signal.h	308	0644	edit dl rm
simd.h	436	0644	edit dl rm
softirq_stack.h	286	0644	edit dl rm
spinlock.h	329	0644	edit dl rm
statfs.h	169	0644	edit dl rm
string.h	281	0644	edit dl rm
switch_to.h	755	0644	edit dl rm
syscall.h	5735	0644	edit dl rm
syscalls.h	739	0644	edit dl rm
termios-base.h	2164	0644	edit dl rm
termios.h	2877	0644	edit dl rm
timex.h	508	0644	edit dl rm
tlb.h	21693	0644	edit dl rm
tlbflush.h	485	0644	edit dl rm
topology.h	2219	0644	edit dl rm
trace_clock.h	391	0644	edit dl rm
uaccess.h	6508	0644	edit dl rm
unaligned.h	2886	0644	edit dl rm
user.h	242	0644	edit dl rm
vermagic.h	179	0644	edit dl rm
vga.h	587	0644	edit dl rm
vmlinux.lds.h	32881	0644	edit dl rm
vtime.h	52	0644	edit dl rm
word-at-a-time.h	2826	0644	edit dl rm
xor.h	13560	0644	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-190/include/asm-generic/tlb.h (21693B)

/* SPDX-License-Identifier: GPL-2.0-or-later */
/* include/asm-generic/tlb.h
 *
 *	Generic TLB shootdown code
 *
 * Copyright 2001 Red Hat, Inc.
 * Based on code from mm/memory.c Copyright Linus Torvalds and others.
 *
 * Copyright 2011 Red Hat, Inc., Peter Zijlstra
 */
#ifndef _ASM_GENERIC__TLB_H
#define _ASM_GENERIC__TLB_H

#include <linux/mmu_notifier.h>
#include <linux/swap.h>
#include <linux/hugetlb_inline.h>
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>

/*
 * Blindly accessing user memory from NMI context can be dangerous
 * if we're in the middle of switching the current user task or switching
 * the loaded mm.
 */
#ifndef nmi_uaccess_okay
# define nmi_uaccess_okay() true
#endif

#ifdef CONFIG_MMU

/*
 * Generic MMU-gather implementation.
 *
 * The mmu_gather data structure is used by the mm code to implement the
 * correct and efficient ordering of freeing pages and TLB invalidations.
 *
 * This correct ordering is:
 *
 *  1) unhook page
 *  2) TLB invalidate page
 *  3) free page
 *
 * That is, we must never free a page before we have ensured there are no live
 * translations left to it. Otherwise it might be possible to observe (or
 * worse, change) the page content after it has been reused.
 *
 * The mmu_gather API consists of:
 *
 *  - tlb_gather_mmu() / tlb_gather_mmu_fullmm() / tlb_gather_mmu_vma() /
 *    tlb_finish_mmu()
 *
 *    start and finish a mmu_gather
 *
 *    Finish in particular will issue a (final) TLB invalidate and free
 *    all (remaining) queued pages.
 *
 *  - tlb_start_vma() / tlb_end_vma(); marks the start / end of a VMA
 *
 *    Defaults to flushing at tlb_end_vma() to reset the range; helps when
 *    there's large holes between the VMAs.
 *
 *  - tlb_remove_table()
 *
 *    tlb_remove_table() is the basic primitive to free page-table directories
 *    (__p*_free_tlb()).  In it's most primitive form it is an alias for
 *    tlb_remove_page() below, for when page directories are pages and have no
 *    additional constraints.
 *
 *    See also MMU_GATHER_TABLE_FREE and MMU_GATHER_RCU_TABLE_FREE.
 *
 *  - tlb_remove_page() / __tlb_remove_page()
 *  - tlb_remove_page_size() / __tlb_remove_page_size()
 *
 *    __tlb_remove_page_size() is the basic primitive that queues a page for
 *    freeing. __tlb_remove_page() assumes PAGE_SIZE. Both will return a
 *    boolean indicating if the queue is (now) full and a call to
 *    tlb_flush_mmu() is required.
 *
 *    tlb_remove_page() and tlb_remove_page_size() imply the call to
 *    tlb_flush_mmu() when required and has no return value.
 *
 *  - tlb_change_page_size()
 *
 *    call before __tlb_remove_page*() to set the current page-size; implies a
 *    possible tlb_flush_mmu() call.
 *
 *  - tlb_flush_mmu() / tlb_flush_mmu_tlbonly()
 *
 *    tlb_flush_mmu_tlbonly() - does the TLB invalidate (and resets
 *                              related state, like the range)
 *
 *    tlb_flush_mmu() - in addition to the above TLB invalidate, also frees
 *			whatever pages are still batched.
 *
 *  - mmu_gather::fullmm
 *
 *    A flag set by tlb_gather_mmu_fullmm() to indicate we're going to free
 *    the entire mm; this allows a number of optimizations.
 *
 *    - We can ignore tlb_{start,end}_vma(); because we don't
 *      care about ranges. Everything will be shot down.
 *
 *    - (RISC) architectures that use ASIDs can cycle to a new ASID
 *      and delay the invalidation until ASID space runs out.
 *
 *  - mmu_gather::need_flush_all
 *
 *    A flag that can be set by the arch code if it wants to force
 *    flush the entire TLB irrespective of the range. For instance
 *    x86-PAE needs this when changing top-level entries.
 *
 * And allows the architecture to provide and implement tlb_flush():
 *
 * tlb_flush() may, in addition to the above mentioned mmu_gather fields, make
 * use of:
 *
 *  - mmu_gather::start / mmu_gather::end
 *
 *    which provides the range that needs to be flushed to cover the pages to
 *    be freed.
 *
 *  - mmu_gather::freed_tables
 *
 *    set when we freed page table pages
 *
 *  - tlb_get_unmap_shift() / tlb_get_unmap_size()
 *
 *    returns the smallest TLB entry size unmapped in this range.
 *
 * If an architecture does not provide tlb_flush() a default implementation
 * based on flush_tlb_range() will be used, unless MMU_GATHER_NO_RANGE is
 * specified, in which case we'll default to flush_tlb_mm().
 *
 * Additionally there are a few opt-in features:
 *
 *  MMU_GATHER_PAGE_SIZE
 *
 *  This ensures we call tlb_flush() every time tlb_change_page_size() actually
 *  changes the size and provides mmu_gather::page_size to tlb_flush().
 *
 *  This might be useful if your architecture has size specific TLB
 *  invalidation instructions.
 *
 *  MMU_GATHER_TABLE_FREE
 *
 *  This provides tlb_remove_table(), to be used instead of tlb_remove_page()
 *  for page directores (__p*_free_tlb()).
 *
 *  Useful if your architecture has non-page page directories.
 *
 *  When used, an architecture is expected to provide __tlb_remove_table()
 *  which does the actual freeing of these pages.
 *
 *  MMU_GATHER_RCU_TABLE_FREE
 *
 *  Like MMU_GATHER_TABLE_FREE, and adds semi-RCU semantics to the free (see
 *  comment below).
 *
 *  Useful if your architecture doesn't use IPIs for remote TLB invalidates
 *  and therefore doesn't naturally serialize with software page-table walkers.
 *
 *  MMU_GATHER_NO_RANGE
 *
 *  Use this if your architecture lacks an efficient flush_tlb_range().
 *
 *  MMU_GATHER_NO_GATHER
 *
 *  If the option is set the mmu_gather will not track individual pages for
 *  delayed page free anymore. A platform that enables the option needs to
 *  provide its own implementation of the __tlb_remove_page_size() function to
 *  free pages.
 *
 *  This is useful if your architecture already flushes TLB entries in the
 *  various ptep_get_and_clear() functions.
 */

#ifdef CONFIG_MMU_GATHER_TABLE_FREE

struct mmu_table_batch {
#ifdef CONFIG_MMU_GATHER_RCU_TABLE_FREE
	struct rcu_head		rcu;
#endif
	unsigned int		nr;
	void			*tables[0];
};

#define MAX_TABLE_BATCH		\
	((PAGE_SIZE - sizeof(struct mmu_table_batch)) / sizeof(void *))

extern void tlb_remove_table(struct mmu_gather *tlb, void *table);

#else /* !CONFIG_MMU_GATHER_HAVE_TABLE_FREE */

/*
 * Without MMU_GATHER_TABLE_FREE the architecture is assumed to have page based
 * page directories and we can use the normal page batching to free them.
 */
#define tlb_remove_table(tlb, page) tlb_remove_page((tlb), (page))

#endif /* CONFIG_MMU_GATHER_TABLE_FREE */

#ifdef CONFIG_MMU_GATHER_RCU_TABLE_FREE
/*
 * This allows an architecture that does not use the linux page-tables for
 * hardware to skip the TLBI when freeing page tables.
 */
#ifndef tlb_needs_table_invalidate
#define tlb_needs_table_invalidate() (true)
#endif

void tlb_remove_table_sync_one(void);

#else

#ifdef tlb_needs_table_invalidate
#error tlb_needs_table_invalidate() requires MMU_GATHER_RCU_TABLE_FREE
#endif

static inline void tlb_remove_table_sync_one(void) { }

#endif /* CONFIG_MMU_GATHER_RCU_TABLE_FREE */

#ifndef CONFIG_MMU_GATHER_NO_GATHER
/*
 * If we can't allocate a page to make a big batch of page pointers
 * to work on, then just handle a few from the on-stack structure.
 */
#define MMU_GATHER_BUNDLE	8

struct mmu_gather_batch {
	struct mmu_gather_batch	*next;
	unsigned int		nr;
	unsigned int		max;
	struct page		*pages[0];
};

#define MAX_GATHER_BATCH	\
	((PAGE_SIZE - sizeof(struct mmu_gather_batch)) / sizeof(void *))

/*
 * Limit the maximum number of mmu_gather batches to reduce a risk of soft
 * lockups for non-preemptible kernels on huge machines when a lot of memory
 * is zapped during unmapping.
 * 10K pages freed at once should be safe even without a preemption point.
 */
#define MAX_GATHER_BATCH_COUNT	(10000UL/MAX_GATHER_BATCH)

extern bool __tlb_remove_page_size(struct mmu_gather *tlb, struct page *page,
				   int page_size);
#endif

/*
 * struct mmu_gather is an opaque type used by the mm code for passing around
 * any data needed by arch specific code for tlb_remove_page.
 */
struct mmu_gather {
	struct mm_struct	*mm;

#ifdef CONFIG_MMU_GATHER_TABLE_FREE
	struct mmu_table_batch	*batch;
#endif

unsigned long		start;
	unsigned long		end;
	/*
	 * we are in the middle of an operation to clear
	 * a full mm and can make some optimizations
	 */
	unsigned int		fullmm : 1;

/*
	 * we have performed an operation which
	 * requires a complete flush of the tlb
	 */
	unsigned int		need_flush_all : 1;

/*
	 * we have removed page directories
	 */
	unsigned int		freed_tables : 1;

/*
	 * at which levels have we cleared entries?
	 */
	unsigned int		cleared_ptes : 1;
	unsigned int		cleared_pmds : 1;
	unsigned int		cleared_puds : 1;
	unsigned int		cleared_p4ds : 1;

/*
	 * tracks VM_EXEC | VM_HUGETLB in tlb_start_vma
	 */
	unsigned int		vma_exec : 1;
	unsigned int		vma_huge : 1;

/*
	 * Did we unshare (unmap) any shared page tables? For now only
	 * used for hugetlb PMD table sharing.
	 */
	unsigned int		unshared_tables : 1;

/*
	 * Did we unshare any page tables such that they are now exclusive
	 * and could get reused+modified by the new owner? When setting this
	 * flag, "unshared_tables" will be set as well. For now only used
	 * for hugetlb PMD table sharing.
	 */
	unsigned int		fully_unshared_tables : 1;

unsigned int		batch_count;

#ifndef CONFIG_MMU_GATHER_NO_GATHER
	struct mmu_gather_batch *active;
	struct mmu_gather_batch	local;
	struct page		*__pages[MMU_GATHER_BUNDLE];

#ifdef CONFIG_MMU_GATHER_PAGE_SIZE
	unsigned int page_size;
#endif
#endif
};

void tlb_flush_mmu(struct mmu_gather *tlb);

static inline void __tlb_adjust_range(struct mmu_gather *tlb,
				      unsigned long address,
				      unsigned int range_size)
{
	tlb->start = min(tlb->start, address);
	tlb->end = max(tlb->end, address + range_size);
}

static inline void __tlb_reset_range(struct mmu_gather *tlb)
{
	if (tlb->fullmm) {
		tlb->start = tlb->end = ~0;
	} else {
		tlb->start = TASK_SIZE;
		tlb->end = 0;
	}
	tlb->freed_tables = 0;
	tlb->cleared_ptes = 0;
	tlb->cleared_pmds = 0;
	tlb->cleared_puds = 0;
	tlb->cleared_p4ds = 0;
	tlb->unshared_tables = 0;
	/*
	 * Do not reset mmu_gather::vma_* fields here, we do not
	 * call into tlb_start_vma() again to set them if there is an
	 * intermediate flush.
	 */
}

#ifdef CONFIG_MMU_GATHER_NO_RANGE

#if defined(tlb_flush) || defined(tlb_start_vma) || defined(tlb_end_vma)
#error MMU_GATHER_NO_RANGE relies on default tlb_flush(), tlb_start_vma() and tlb_end_vma()
#endif

/*
 * When an architecture does not have efficient means of range flushing TLBs
 * there is no point in doing intermediate flushes on tlb_end_vma() to keep the
 * range small. We equally don't have to worry about page granularity or other
 * things.
 *
 * All we need to do is issue a full flush for any !0 range.
 */
static inline void tlb_flush(struct mmu_gather *tlb)
{
	if (tlb->end)
		flush_tlb_mm(tlb->mm);
}

static inline void
tlb_update_vma_flags(struct mmu_gather *tlb, struct vm_area_struct *vma) { }

#define tlb_end_vma tlb_end_vma
static inline void tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma) { }

#else /* CONFIG_MMU_GATHER_NO_RANGE */

#ifndef tlb_flush

#if defined(tlb_start_vma) || defined(tlb_end_vma)
#error Default tlb_flush() relies on default tlb_start_vma() and tlb_end_vma()
#endif

/*
 * When an architecture does not provide its own tlb_flush() implementation
 * but does have a reasonably efficient flush_vma_range() implementation
 * use that.
 */
static inline void tlb_flush(struct mmu_gather *tlb)
{
	if (tlb->fullmm || tlb->need_flush_all) {
		flush_tlb_mm(tlb->mm);
	} else if (tlb->end) {
		struct vm_area_struct vma = {
			.vm_mm = tlb->mm,
			.vm_flags = (tlb->vma_exec ? VM_EXEC    : 0) |
				    (tlb->vma_huge ? VM_HUGETLB : 0),
		};

flush_tlb_range(&vma, tlb->start, tlb->end);
	}
}

static inline void
tlb_update_vma_flags(struct mmu_gather *tlb, struct vm_area_struct *vma)
{
	/*
	 * flush_tlb_range() implementations that look at VM_HUGETLB (tile,
	 * mips-4k) flush only large pages.
	 *
	 * flush_tlb_range() implementations that flush I-TLB also flush D-TLB
	 * (tile, xtensa, arm), so it's ok to just add VM_EXEC to an existing
	 * range.
	 *
	 * We rely on tlb_end_vma() to issue a flush, such that when we reset
	 * these values the batch is empty.
	 */
	tlb->vma_huge = is_vm_hugetlb_page(vma);
	tlb->vma_exec = !!(vma->vm_flags & VM_EXEC);
}

#else

static inline void
tlb_update_vma_flags(struct mmu_gather *tlb, struct vm_area_struct *vma) { }

#endif

#endif /* CONFIG_MMU_GATHER_NO_RANGE */

static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb)
{
	/*
	 * Anything calling __tlb_adjust_range() also sets at least one of
	 * these bits.
	 */
	if (!(tlb->freed_tables || tlb->cleared_ptes || tlb->cleared_pmds ||
	      tlb->cleared_puds || tlb->cleared_p4ds || tlb->unshared_tables))
		return;

tlb_flush(tlb);
	mmu_notifier_invalidate_range(tlb->mm, tlb->start, tlb->end);
	__tlb_reset_range(tlb);
}

static inline void tlb_remove_page_size(struct mmu_gather *tlb,
					struct page *page, int page_size)
{
	if (__tlb_remove_page_size(tlb, page, page_size))
		tlb_flush_mmu(tlb);
}

static inline bool __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
	return __tlb_remove_page_size(tlb, page, PAGE_SIZE);
}

/* tlb_remove_page
 *	Similar to __tlb_remove_page but will call tlb_flush_mmu() itself when
 *	required.
 */
static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
	return tlb_remove_page_size(tlb, page, PAGE_SIZE);
}

static inline void tlb_change_page_size(struct mmu_gather *tlb,
						     unsigned int page_size)
{
#ifdef CONFIG_MMU_GATHER_PAGE_SIZE
	if (tlb->page_size && tlb->page_size != page_size) {
		if (!tlb->fullmm && !tlb->need_flush_all)
			tlb_flush_mmu(tlb);
	}

tlb->page_size = page_size;
#endif
}

static inline unsigned long tlb_get_unmap_shift(struct mmu_gather *tlb)
{
	if (tlb->cleared_ptes)
		return PAGE_SHIFT;
	if (tlb->cleared_pmds)
		return PMD_SHIFT;
	if (tlb->cleared_puds)
		return PUD_SHIFT;
	if (tlb->cleared_p4ds)
		return P4D_SHIFT;

return PAGE_SHIFT;
}

static inline unsigned long tlb_get_unmap_size(struct mmu_gather *tlb)
{
	return 1UL << tlb_get_unmap_shift(tlb);
}

/*
 * In the case of tlb vma handling, we can optimise these away in the
 * case where we're doing a full MM flush.  When we're doing a munmap,
 * the vmas are adjusted to only cover the region to be torn down.
 */
#ifndef tlb_start_vma
static inline void tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
{
	if (tlb->fullmm)
		return;

tlb_update_vma_flags(tlb, vma);
	flush_cache_range(vma, vma->vm_start, vma->vm_end);
}
#endif

#ifndef tlb_end_vma
static inline void tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
{
	if (tlb->fullmm)
		return;

/*
	 * Do a TLB flush and reset the range at VMA boundaries; this avoids
	 * the ranges growing with the unused space between consecutive VMAs,
	 * but also the mmu_gather::vma_* flags from tlb_start_vma() rely on
	 * this.
	 */
	tlb_flush_mmu_tlbonly(tlb);
}
#endif

/*
 * tlb_flush_{pte|pmd|pud|p4d}_range() adjust the tlb->start and tlb->end,
 * and set corresponding cleared_*.
 */
static inline void tlb_flush_pte_range(struct mmu_gather *tlb,
				     unsigned long address, unsigned long size)
{
	__tlb_adjust_range(tlb, address, size);
	tlb->cleared_ptes = 1;
}

static inline void tlb_flush_pmd_range(struct mmu_gather *tlb,
				     unsigned long address, unsigned long size)
{
	__tlb_adjust_range(tlb, address, size);
	tlb->cleared_pmds = 1;
}

static inline void tlb_flush_pud_range(struct mmu_gather *tlb,
				     unsigned long address, unsigned long size)
{
	__tlb_adjust_range(tlb, address, size);
	tlb->cleared_puds = 1;
}

static inline void tlb_flush_p4d_range(struct mmu_gather *tlb,
				     unsigned long address, unsigned long size)
{
	__tlb_adjust_range(tlb, address, size);
	tlb->cleared_p4ds = 1;
}

#ifndef __tlb_remove_tlb_entry
#define __tlb_remove_tlb_entry(tlb, ptep, address) do { } while (0)
#endif

/**
 * tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation.
 *
 * Record the fact that pte's were really unmapped by updating the range,
 * so we can later optimise away the tlb invalidate.   This helps when
 * userspace is unmapping already-unmapped pages, which happens quite a lot.
 */
#define tlb_remove_tlb_entry(tlb, ptep, address)		\
	do {							\
		tlb_flush_pte_range(tlb, address, PAGE_SIZE);	\
		__tlb_remove_tlb_entry(tlb, ptep, address);	\
	} while (0)

#define tlb_remove_huge_tlb_entry(h, tlb, ptep, address)	\
	do {							\
		unsigned long _sz = huge_page_size(h);		\
		if (_sz >= P4D_SIZE)				\
			tlb_flush_p4d_range(tlb, address, _sz);	\
		else if (_sz >= PUD_SIZE)			\
			tlb_flush_pud_range(tlb, address, _sz);	\
		else if (_sz >= PMD_SIZE)			\
			tlb_flush_pmd_range(tlb, address, _sz);	\
		else						\
			tlb_flush_pte_range(tlb, address, _sz);	\
		__tlb_remove_tlb_entry(tlb, ptep, address);	\
	} while (0)

/**
 * tlb_remove_pmd_tlb_entry - remember a pmd mapping for later tlb invalidation
 * This is a nop so far, because only x86 needs it.
 */
#ifndef __tlb_remove_pmd_tlb_entry
#define __tlb_remove_pmd_tlb_entry(tlb, pmdp, address) do {} while (0)
#endif

#define tlb_remove_pmd_tlb_entry(tlb, pmdp, address)			\
	do {								\
		tlb_flush_pmd_range(tlb, address, HPAGE_PMD_SIZE);	\
		__tlb_remove_pmd_tlb_entry(tlb, pmdp, address);		\
	} while (0)

/**
 * tlb_remove_pud_tlb_entry - remember a pud mapping for later tlb
 * invalidation. This is a nop so far, because only x86 needs it.
 */
#ifndef __tlb_remove_pud_tlb_entry
#define __tlb_remove_pud_tlb_entry(tlb, pudp, address) do {} while (0)
#endif

#define tlb_remove_pud_tlb_entry(tlb, pudp, address)			\
	do {								\
		tlb_flush_pud_range(tlb, address, HPAGE_PUD_SIZE);	\
		__tlb_remove_pud_tlb_entry(tlb, pudp, address);		\
	} while (0)

/*
 * For things like page tables caches (ie caching addresses "inside" the
 * page tables, like x86 does), for legacy reasons, flushing an
 * individual page had better flush the page table caches behind it. This
 * is definitely how x86 works, for example. And if you have an
 * architected non-legacy page table cache (which I'm not aware of
 * anybody actually doing), you're going to have some architecturally
 * explicit flushing for that, likely *separate* from a regular TLB entry
 * flush, and thus you'd need more than just some range expansion..
 *
 * So if we ever find an architecture
 * that would want something that odd, I think it is up to that
 * architecture to do its own odd thing, not cause pain for others
 * http://lkml.kernel.org/r/CA+55aFzBggoXtNXQeng5d_mRoDnaMBE5Y+URs+PHR67nUpMtaw@mail.gmail.com
 *
 * For now w.r.t page table cache, mark the range_size as PAGE_SIZE
 */

#ifndef pte_free_tlb
#define pte_free_tlb(tlb, ptep, address)			\
	do {							\
		tlb_flush_pmd_range(tlb, address, PAGE_SIZE);	\
		tlb->freed_tables = 1;				\
		__pte_free_tlb(tlb, ptep, address);		\
	} while (0)
#endif

#ifndef pmd_free_tlb
#define pmd_free_tlb(tlb, pmdp, address)			\
	do {							\
		tlb_flush_pud_range(tlb, address, PAGE_SIZE);	\
		tlb->freed_tables = 1;				\
		__pmd_free_tlb(tlb, pmdp, address);		\
	} while (0)
#endif

#ifndef pud_free_tlb
#define pud_free_tlb(tlb, pudp, address)			\
	do {							\
		tlb_flush_p4d_range(tlb, address, PAGE_SIZE);	\
		tlb->freed_tables = 1;				\
		__pud_free_tlb(tlb, pudp, address);		\
	} while (0)
#endif

#ifndef p4d_free_tlb
#define p4d_free_tlb(tlb, pudp, address)			\
	do {							\
		__tlb_adjust_range(tlb, address, PAGE_SIZE);	\
		tlb->freed_tables = 1;				\
		__p4d_free_tlb(tlb, pudp, address);		\
	} while (0)
#endif

#if defined(CONFIG_ARCH_WANT_HUGE_PMD_SHARE) && defined(CONFIG_HUGETLB_PAGE)
static inline void tlb_unshare_pmd_ptdesc(struct mmu_gather *tlb, struct page *pt,
					  unsigned long addr)
{
	/*
	 * The caller must make sure that concurrent unsharing + exclusive
	 * reuse is impossible until tlb_flush_unshared_tables() was called.
	 */
	VM_WARN_ON_ONCE(!atomic_read(&pt->pt_share_count));
	atomic_dec(&pt->pt_share_count);

/* Clearing a PUD pointing at a PMD table with PMD leaves. */
	tlb_flush_pmd_range(tlb, addr & PUD_MASK, PUD_SIZE);

/*
	 * If the page table is now exclusively owned, we fully unshared
	 * a page table.
	 */
	if (!atomic_read(&pt->pt_share_count))
		tlb->fully_unshared_tables = true;
	tlb->unshared_tables = true;
}

static inline void tlb_flush_unshared_tables(struct mmu_gather *tlb)
{
	/*
	 * As soon as the caller drops locks to allow for reuse of
	 * previously-shared tables, these tables could get modified and
	 * even reused outside of hugetlb context, so we have to make sure that
	 * any page table walkers (incl. TLB, GUP-fast) are aware of that
	 * change.
	 *
	 * Even if we are not fully unsharing a PMD table, we must
	 * flush the TLB for the unsharer now.
	 */
	if (tlb->unshared_tables)
		tlb_flush_mmu_tlbonly(tlb);

/*
	 * Similarly, we must make sure that concurrent GUP-fast will not
	 * walk previously-shared page tables that are getting modified+reused
	 * elsewhere. So broadcast an IPI to wait for any concurrent GUP-fast.
	 *
	 * We only perform this when we are the last sharer of a page table,
	 * as the IPI will reach all CPUs: any GUP-fast.
	 *
	 * Note that on configs where tlb_remove_table_sync_one() is a NOP,
	 * the expectation is that the tlb_flush_mmu_tlbonly() would have issued
	 * required IPIs already for us.
	 */
	if (tlb->fully_unshared_tables) {
		tlb_remove_table_sync_one();
		tlb->fully_unshared_tables = false;
	}
}
#endif

#endif /* CONFIG_MMU */

#endif /* _ASM_GENERIC__TLB_H */

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