Revision e700898fa075c69b3ae02b702ab57fb75e1a82ec authored by Mike Kravetz on 12 December 2022, 23:50:41 UTC, committed by Andrew Morton on 21 December 2022, 22:31:52 UTC
Commit bbff39cc6cbc ("hugetlb: allocate vma lock for all sharable vmas") removed the pmd sharable checks in the vma lock helper routines. However, it left the functional version of helper routines behind #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE. Therefore, the vma lock is not being used for sharable vmas on architectures that do not support pmd sharing. On these architectures, a potential fault/truncation race is exposed that could leave pages in a hugetlb file past i_size until the file is removed. Move the functional vma lock helpers outside the ifdef, and remove the non-functional stubs. Since the vma lock is not just for pmd sharing, rename the routine __vma_shareable_flags_pmd. Link: https://lkml.kernel.org/r/20221212235042.178355-1-mike.kravetz@oracle.com Fixes: bbff39cc6cbc ("hugetlb: allocate vma lock for all sharable vmas") Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com> Reviewed-by: Miaohe Lin <linmiaohe@huawei.com> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Cc: David Hildenbrand <david@redhat.com> Cc: James Houghton <jthoughton@google.com> Cc: Mina Almasry <almasrymina@google.com> Cc: Muchun Song <songmuchun@bytedance.com> Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev> Cc: Peter Xu <peterx@redhat.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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fhci-dbg.c
// SPDX-License-Identifier: GPL-2.0+
/*
* Freescale QUICC Engine USB Host Controller Driver
*
* Copyright (c) Freescale Semicondutor, Inc. 2006.
* Shlomi Gridish <gridish@freescale.com>
* Jerry Huang <Chang-Ming.Huang@freescale.com>
* Copyright (c) Logic Product Development, Inc. 2007
* Peter Barada <peterb@logicpd.com>
* Copyright (c) MontaVista Software, Inc. 2008.
* Anton Vorontsov <avorontsov@ru.mvista.com>
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include "fhci.h"
void fhci_dbg_isr(struct fhci_hcd *fhci, int usb_er)
{
int i;
if (usb_er == -1) {
fhci->usb_irq_stat[12]++;
return;
}
for (i = 0; i < 12; ++i) {
if (usb_er & (1 << i))
fhci->usb_irq_stat[i]++;
}
}
static int fhci_dfs_regs_show(struct seq_file *s, void *v)
{
struct fhci_hcd *fhci = s->private;
struct qe_usb_ctlr __iomem *regs = fhci->regs;
seq_printf(s,
"mode: 0x%x\n" "addr: 0x%x\n"
"command: 0x%x\n" "ep0: 0x%x\n"
"event: 0x%x\n" "mask: 0x%x\n"
"status: 0x%x\n" "SOF timer: %d\n"
"frame number: %d\n"
"lines status: 0x%x\n",
in_8(®s->usb_usmod), in_8(®s->usb_usadr),
in_8(®s->usb_uscom), in_be16(®s->usb_usep[0]),
in_be16(®s->usb_usber), in_be16(®s->usb_usbmr),
in_8(®s->usb_usbs), in_be16(®s->usb_ussft),
in_be16(®s->usb_usfrn),
fhci_ioports_check_bus_state(fhci));
return 0;
}
DEFINE_SHOW_ATTRIBUTE(fhci_dfs_regs);
static int fhci_dfs_irq_stat_show(struct seq_file *s, void *v)
{
struct fhci_hcd *fhci = s->private;
int *usb_irq_stat = fhci->usb_irq_stat;
seq_printf(s,
"RXB: %d\n" "TXB: %d\n" "BSY: %d\n"
"SOF: %d\n" "TXE0: %d\n" "TXE1: %d\n"
"TXE2: %d\n" "TXE3: %d\n" "IDLE: %d\n"
"RESET: %d\n" "SFT: %d\n" "MSF: %d\n"
"IDLE_ONLY: %d\n",
usb_irq_stat[0], usb_irq_stat[1], usb_irq_stat[2],
usb_irq_stat[3], usb_irq_stat[4], usb_irq_stat[5],
usb_irq_stat[6], usb_irq_stat[7], usb_irq_stat[8],
usb_irq_stat[9], usb_irq_stat[10], usb_irq_stat[11],
usb_irq_stat[12]);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(fhci_dfs_irq_stat);
void fhci_dfs_create(struct fhci_hcd *fhci)
{
struct device *dev = fhci_to_hcd(fhci)->self.controller;
fhci->dfs_root = debugfs_create_dir(dev_name(dev), usb_debug_root);
debugfs_create_file("regs", S_IFREG | S_IRUGO, fhci->dfs_root, fhci,
&fhci_dfs_regs_fops);
debugfs_create_file("irq_stat", S_IFREG | S_IRUGO, fhci->dfs_root, fhci,
&fhci_dfs_irq_stat_fops);
}
void fhci_dfs_destroy(struct fhci_hcd *fhci)
{
debugfs_remove_recursive(fhci->dfs_root);
}
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