From a5bde5d8fde8a8cb28e59a672d5ddc5b9c1e7656 Mon Sep 17 00:00:00 2001 From: Breno Leitao Date: Wed, 5 Aug 2026 07:52:36 -0700 Subject: workqueue: skip the node_nr_active update for non-unbound workqueues apply_wqattrs_commit() updates node_nr_active->max unconditionally. wq->node_nr_active[] is only allocated for unbound workqueues, so guard the call before per-cpu workqueues start using this path. No functional change: only unbound workqueues reach apply_wqattrs_*() today. Signed-off-by: Breno Leitao Signed-off-by: Tejun Heo --- arch/parisc/lib/memcpy.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 arch/parisc/lib/memcpy.c (limited to 'arch/parisc/lib/memcpy.c') diff --git a/arch/parisc/lib/memcpy.c b/arch/parisc/lib/memcpy.c new file mode 100644 index 000000000..03165c82d --- /dev/null +++ b/arch/parisc/lib/memcpy.c @@ -0,0 +1,73 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Optimized memory copy routines. + * + * Copyright (C) 2004 Randolph Chung + * Copyright (C) 2013-2017 Helge Deller + * + * Portions derived from the GNU C Library + * Copyright (C) 1991, 1997, 2003 Free Software Foundation, Inc. + */ + +#include +#include +#include +#include + +#define get_user_space() mfsp(SR_USER) +#define get_kernel_space() SR_KERNEL + +/* Returns 0 for success, otherwise, returns number of bytes not transferred. */ +extern unsigned long pa_memcpy(void *dst, const void *src, + unsigned long len); + +unsigned long raw_copy_to_user(void __user *dst, const void *src, + unsigned long len) +{ + mtsp(get_kernel_space(), SR_TEMP1); + mtsp(get_user_space(), SR_TEMP2); + return pa_memcpy((void __force *)dst, src, len); +} +EXPORT_SYMBOL(raw_copy_to_user); + +unsigned long raw_copy_from_user(void *dst, const void __user *src, + unsigned long len) +{ + unsigned long start = (unsigned long) src; + unsigned long end = start + len; + unsigned long newlen = len; + + mtsp(get_user_space(), SR_TEMP1); + mtsp(get_kernel_space(), SR_TEMP2); + + /* Check region is user accessible */ + while (start < end) { + if (!prober_user(SR_TEMP1, start)) { + newlen = (start - (unsigned long) src); + break; + } + start += PAGE_SIZE; + /* align to page boundry which may have different permission */ + start = PAGE_ALIGN_DOWN(start); + } + return len - newlen + pa_memcpy(dst, (void __force *)src, newlen); +} +EXPORT_SYMBOL(raw_copy_from_user); + +void * memcpy(void * dst,const void *src, size_t count) +{ + mtsp(get_kernel_space(), SR_TEMP1); + mtsp(get_kernel_space(), SR_TEMP2); + pa_memcpy(dst, src, count); + return dst; +} + +EXPORT_SYMBOL(memcpy); + +bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) +{ + if ((unsigned long)unsafe_src < PAGE_SIZE) + return false; + /* check for I/O space F_EXTEND(0xfff00000) access as well? */ + return true; +} -- cgit v1.3.1