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synced 2026-08-09 06:14:34 +02:00
Yury NorovandAndrew Morton
c02be2ad2b
The kernel allows arches to select between inline and outline
implementations of the copy_{from,to}_user() by defining individual
INLINE_COPY_FROM_USER and INLINE_COPY_TO_USER, correspondingly. However,
all arches enable or disable them always together.
Without the real use-case for one helper being inlined while the other
outlined, having independent controls is excessive and error prone.
Switch the codebase to the single unified INLINE_COPY_USER control.
Link: https://lore.kernel.org/20260425020857.356850-3-ynorov@nvidia.com
Signed-off-by: Yury Norov <ynorov@nvidia.com>
Tested-by: Alice Ryhl <aliceryhl@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Viktor Malik <vmalik@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
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* Copyright (C) 2015 Richard Weinberger (richard@nod.at)
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*/
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#ifndef __UM_UACCESS_H
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#define __UM_UACCESS_H
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#include <asm/elf.h>
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#include <linux/unaligned.h>
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#include <sysdep/faultinfo.h>
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#define __under_task_size(addr, size) \
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(((unsigned long) (addr) < TASK_SIZE) && \
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(((unsigned long) (addr) + (size)) < TASK_SIZE))
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#define __addr_range_nowrap(addr, size) \
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((unsigned long) (addr) <= ((unsigned long) (addr) + (size)))
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extern unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n);
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extern unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n);
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extern unsigned long __clear_user(void __user *mem, unsigned long len);
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static inline int __access_ok(const void __user *ptr, unsigned long size);
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/* Teach asm-generic/uaccess.h that we have C functions for these. */
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#define __access_ok __access_ok
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#define __clear_user __clear_user
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#define INLINE_COPY_USER
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#include <asm-generic/uaccess.h>
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static inline int __access_ok(const void __user *ptr, unsigned long size)
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{
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unsigned long addr = (unsigned long)ptr;
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return __addr_range_nowrap(addr, size) && __under_task_size(addr, size);
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}
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#define __get_kernel_nofault(dst, src, type, err_label) \
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do { \
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int __faulted; \
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\
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___backtrack_faulted(__faulted); \
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if (__faulted) { \
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*((type *)dst) = (type) 0; \
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goto err_label; \
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} \
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*((type *)dst) = get_unaligned((type *)(src)); \
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barrier(); \
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current->thread.segv_continue = NULL; \
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} while (0)
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#define __put_kernel_nofault(dst, src, type, err_label) \
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do { \
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int __faulted; \
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\
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___backtrack_faulted(__faulted); \
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if (__faulted) \
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goto err_label; \
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put_unaligned(*((type *)src), (type *)(dst)); \
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barrier(); \
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current->thread.segv_continue = NULL; \
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} while (0)
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#endif
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