Revision 7e6582ef32f6cbd55b9c752727847b0ee6710e78 authored by Linus Torvalds on 06 March 2020, 22:38:33 UTC, committed by Linus Torvalds on 06 March 2020, 22:38:33 UTC
Pull RISC-V fixes from Palmer Dabbelt:
"This contains a handful of fixes that I would like to target for 5.6:
- A pair of fixes to module loading, which we hope solve the last of
the issues with module text being loaded too sparsely for our call
relocations.
- A Kconfig fix that disallows selecting memory models not supported
by NOMMU.
- A series of Kconfig updates to ease selecting the drivers necessary
to run on QEMU's virt platform.
- DTS updates for SiFive's HiFive Unleashed.
- A fix to our seccomp support that avoids mangling restartable
syscalls"
* tag 'riscv-for-linus-5.6-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
riscv: fix seccomp reject syscall code path
riscv: dts: Add GPIO reboot method to HiFive Unleashed DTS file
RISC-V: Select Goldfish RTC driver for QEMU virt machine
RISC-V: Select SYSCON Reboot and Poweroff for QEMU virt machine
RISC-V: Enable QEMU virt machine support in defconfigs
RISC-V: Add kconfig option for QEMU virt machine
riscv: Fix range looking for kernel image memblock
riscv: Force flat memory model with no-mmu
riscv: Change code model of module to medany to improve data accessing
riscv: avoid the PIC offset of static percpu data in module beyond 2G limits
msync.c
// SPDX-License-Identifier: GPL-2.0
/*
* linux/mm/msync.c
*
* Copyright (C) 1994-1999 Linus Torvalds
*/
/*
* The msync() system call.
*/
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/file.h>
#include <linux/syscalls.h>
#include <linux/sched.h>
/*
* MS_SYNC syncs the entire file - including mappings.
*
* MS_ASYNC does not start I/O (it used to, up to 2.5.67).
* Nor does it marks the relevant pages dirty (it used to up to 2.6.17).
* Now it doesn't do anything, since dirty pages are properly tracked.
*
* The application may now run fsync() to
* write out the dirty pages and wait on the writeout and check the result.
* Or the application may run fadvise(FADV_DONTNEED) against the fd to start
* async writeout immediately.
* So by _not_ starting I/O in MS_ASYNC we provide complete flexibility to
* applications.
*/
SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags)
{
unsigned long end;
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
int unmapped_error = 0;
int error = -EINVAL;
start = untagged_addr(start);
if (flags & ~(MS_ASYNC | MS_INVALIDATE | MS_SYNC))
goto out;
if (offset_in_page(start))
goto out;
if ((flags & MS_ASYNC) && (flags & MS_SYNC))
goto out;
error = -ENOMEM;
len = (len + ~PAGE_MASK) & PAGE_MASK;
end = start + len;
if (end < start)
goto out;
error = 0;
if (end == start)
goto out;
/*
* If the interval [start,end) covers some unmapped address ranges,
* just ignore them, but return -ENOMEM at the end.
*/
down_read(&mm->mmap_sem);
vma = find_vma(mm, start);
for (;;) {
struct file *file;
loff_t fstart, fend;
/* Still start < end. */
error = -ENOMEM;
if (!vma)
goto out_unlock;
/* Here start < vma->vm_end. */
if (start < vma->vm_start) {
start = vma->vm_start;
if (start >= end)
goto out_unlock;
unmapped_error = -ENOMEM;
}
/* Here vma->vm_start <= start < vma->vm_end. */
if ((flags & MS_INVALIDATE) &&
(vma->vm_flags & VM_LOCKED)) {
error = -EBUSY;
goto out_unlock;
}
file = vma->vm_file;
fstart = (start - vma->vm_start) +
((loff_t)vma->vm_pgoff << PAGE_SHIFT);
fend = fstart + (min(end, vma->vm_end) - start) - 1;
start = vma->vm_end;
if ((flags & MS_SYNC) && file &&
(vma->vm_flags & VM_SHARED)) {
get_file(file);
up_read(&mm->mmap_sem);
error = vfs_fsync_range(file, fstart, fend, 1);
fput(file);
if (error || start >= end)
goto out;
down_read(&mm->mmap_sem);
vma = find_vma(mm, start);
} else {
if (start >= end) {
error = 0;
goto out_unlock;
}
vma = vma->vm_next;
}
}
out_unlock:
up_read(&mm->mmap_sem);
out:
return error ? : unmapped_error;
}
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