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2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e 
 kernel/arch/parisc/kernel/process.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  *    PARISC Architecture-dependent parts of process handling
34  *    based on the work for i386
....@@ -15,21 +16,6 @@
1516  *    Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org>
1617  *    Copyright (C) 2001-2014 Helge Deller <deller@gmx.de>
1718  *    Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org>
18
- *
19
- *
20
- *    This program is free software; you can redistribute it and/or modify
21
- *    it under the terms of the GNU General Public License as published by
22
- *    the Free Software Foundation; either version 2 of the License, or
23
- *    (at your option) any later version.
24
- *
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- *    This program is distributed in the hope that it will be useful,
26
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
27
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
28
- *    GNU General Public License for more details.
29
- *
30
- *    You should have received a copy of the GNU General Public License
31
- *    along with this program; if not, write to the Free Software
32
- *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
3319  */
3420 
3521 #include <stdarg.h>
....@@ -61,7 +47,6 @@
6147 #include <asm/assembly.h>
6248 #include <asm/pdc.h>
6349 #include <asm/pdc_chassis.h>
64
-#include <asm/pgalloc.h>
6550 #include <asm/unwind.h>
6651 #include <asm/sections.h>
6752 
....@@ -138,13 +123,18 @@
138123 	/* It seems we have no way to power the system off via
139124 	 * software. The user has to press the button himself. */
140125 
141
-	printk(KERN_EMERG "System shut down completed.\n"
142
-	       "Please power this system off now.");
126
+	printk("Power off or press RETURN to reboot.\n");
143127 
144128 	/* prevent soft lockup/stalled CPU messages for endless loop. */
145129 	rcu_sysrq_start();
146130 	lockup_detector_soft_poweroff();
147
-	for (;;);
131
+	while (1) {
132
+		/* reboot if user presses RETURN key */
133
+		if (pdc_iodc_getc() == 13) {
134
+			printk("Rebooting...\n");
135
+			machine_restart(NULL);
136
+		}
137
+	}
148138 }
149139 
150140 void (*pm_power_off)(void);
....@@ -167,32 +157,13 @@
167157 }
168158 
169159 /*
170
- * Fill in the FPU structure for a core dump.
171
- */
172
-
173
-int dump_fpu (struct pt_regs * regs, elf_fpregset_t *r)
174
-{
175
-	if (regs == NULL)
176
-		return 0;
177
-
178
-	memcpy(r, regs->fr, sizeof *r);
179
-	return 1;
180
-}
181
-
182
-int dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *r)
183
-{
184
-	memcpy(r, tsk->thread.regs.fr, sizeof(*r));
185
-	return 1;
186
-}
187
-
188
-/*
189160  * Idle thread support
190161  *
191162  * Detect when running on QEMU with SeaBIOS PDC Firmware and let
192163  * QEMU idle the host too.
193164  */
194165 
195
-int running_on_qemu __read_mostly;
166
+int running_on_qemu __ro_after_init;
196167 EXPORT_SYMBOL(running_on_qemu);
197168 
198169 void __cpuidle arch_cpu_idle_dead(void)
....@@ -203,7 +174,7 @@
203174 
204175 void __cpuidle arch_cpu_idle(void)
205176 {
206
-	local_irq_enable();
177
+	raw_local_irq_enable();
207178 
208179 	/* nop on real hardware, qemu will idle sleep. */
209180 	asm volatile("or %%r10,%%r10,%%r10\n":::);
....@@ -223,7 +194,7 @@
223194  */
224195 int
225196 copy_thread(unsigned long clone_flags, unsigned long usp,
226
-	    unsigned long kthread_arg, struct task_struct *p)
197
+	    unsigned long kthread_arg, struct task_struct *p, unsigned long tls)
227198 {
228199 	struct pt_regs *cregs = &(p->thread.regs);
229200 	void *stack = task_stack_page(p);
....@@ -234,7 +205,7 @@
234205 	extern void * const ret_from_kernel_thread;
235206 	extern void * const child_return;
236207 
237
-	if (unlikely(p->flags & PF_KTHREAD)) {
208
+	if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) {
238209 		/* kernel thread */
239210 		memset(cregs, 0, sizeof(struct pt_regs));
240211 		if (!usp) /* idle thread */
....@@ -268,9 +239,9 @@
268239 		cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE;
269240 		cregs->kpc = (unsigned long) &child_return;
270241 
271
-		/* Setup thread TLS area from the 4th parameter in clone */
242
+		/* Setup thread TLS area */
272243 		if (clone_flags & CLONE_SETTLS)
273
-			cregs->cr27 = cregs->gr[23];
244
+			cregs->cr27 = tls;
274245 	}
275246 
276247 	return 0;
....@@ -307,7 +278,7 @@
307278 	Elf64_Fdesc *desc = ptr;
308279 	void *p;
309280 
310
-	if (!probe_kernel_address(&desc->addr, p))
281
+	if (!get_kernel_nofault(p, (void *)&desc->addr))
311282 		ptr = p;
312283 	return ptr;
313284 }