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2717c6b649
When a PTE is updated in the page table, the _PAGE_NEWPAGE bit will always be set. And the corresponding page will always be mapped or unmapped depending on whether the PTE is present or not. The check on the _PAGE_NEWPROT bit is not really reachable. Abandoning it will allow us to simplify the code and remove the unreachable code. Reviewed-by: Benjamin Berg <benjamin.berg@intel.com> Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20241011102354.1682626-2-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>
59 lines
1.2 KiB
C
59 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
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* Copyright (C) 2005 Jeff Dike (jdike@karaya.com)
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*/
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#ifndef __STUB_DATA_H
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#define __STUB_DATA_H
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#include <linux/compiler_types.h>
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#include <as-layout.h>
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#include <sysdep/tls.h>
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struct stub_init_data {
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unsigned long stub_start;
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int stub_code_fd;
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unsigned long stub_code_offset;
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int stub_data_fd;
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unsigned long stub_data_offset;
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unsigned long segv_handler;
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};
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#define STUB_NEXT_SYSCALL(s) \
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((struct stub_syscall *) (((unsigned long) s) + (s)->cmd_len))
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enum stub_syscall_type {
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STUB_SYSCALL_UNSET = 0,
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STUB_SYSCALL_MMAP,
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STUB_SYSCALL_MUNMAP,
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};
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struct stub_syscall {
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struct {
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unsigned long addr;
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unsigned long length;
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unsigned long offset;
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int fd;
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int prot;
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} mem;
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enum stub_syscall_type syscall;
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};
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struct stub_data {
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unsigned long offset;
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long err, child_err;
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int syscall_data_len;
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/* 128 leaves enough room for additional fields in the struct */
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struct stub_syscall syscall_data[(UM_KERN_PAGE_SIZE - 128) / sizeof(struct stub_syscall)] __aligned(16);
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/* Stack for our signal handlers and for calling into . */
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unsigned char sigstack[UM_KERN_PAGE_SIZE] __aligned(UM_KERN_PAGE_SIZE);
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};
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#endif
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