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bf4afc53b7
This was done entirely with mindless brute force, using
git grep -l '\<k[vmz]*alloc_objs*(.*, GFP_KERNEL)' |
xargs sed -i 's/\(alloc_objs*(.*\), GFP_KERNEL)/\1)/'
to convert the new alloc_obj() users that had a simple GFP_KERNEL
argument to just drop that argument.
Note that due to the extreme simplicity of the scripting, any slightly
more complex cases spread over multiple lines would not be triggered:
they definitely exist, but this covers the vast bulk of the cases, and
the resulting diff is also then easier to check automatically.
For the same reason the 'flex' versions will be done as a separate
conversion.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
102 lines
2.2 KiB
C
102 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2012
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* Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
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*/
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#include <linux/kernel.h>
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#include <linux/syscalls.h>
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#include <linux/signal.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/kernel_stat.h>
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#include <linux/sched/task_stack.h>
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#include <asm/runtime_instr.h>
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#include <asm/cpu_mf.h>
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#include <asm/irq.h>
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#include "entry.h"
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/* empty control block to disable RI by loading it */
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struct runtime_instr_cb runtime_instr_empty_cb;
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void runtime_instr_release(struct task_struct *tsk)
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{
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kfree(tsk->thread.ri_cb);
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}
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static void disable_runtime_instr(void)
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{
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struct task_struct *task = current;
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struct pt_regs *regs;
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if (!task->thread.ri_cb)
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return;
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regs = task_pt_regs(task);
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preempt_disable();
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load_runtime_instr_cb(&runtime_instr_empty_cb);
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kfree(task->thread.ri_cb);
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task->thread.ri_cb = NULL;
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preempt_enable();
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/*
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* Make sure the RI bit is deleted from the PSW. If the user did not
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* switch off RI before the system call the process will get a
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* specification exception otherwise.
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*/
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regs->psw.mask &= ~PSW_MASK_RI;
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}
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static void init_runtime_instr_cb(struct runtime_instr_cb *cb)
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{
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cb->rla = 0xfff;
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cb->s = 1;
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cb->k = 1;
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cb->ps = 1;
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cb->pc = 1;
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cb->key = PAGE_DEFAULT_KEY >> 4;
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cb->v = 1;
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}
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/*
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* The signum argument is unused. In older kernels it was used to
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* specify a real-time signal. For backwards compatibility user space
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* should pass a valid real-time signal number (the signum argument
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* was checked in older kernels).
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*/
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SYSCALL_DEFINE2(s390_runtime_instr, int, command, int, signum)
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{
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struct runtime_instr_cb *cb;
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if (!test_facility(64))
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return -EOPNOTSUPP;
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if (command == S390_RUNTIME_INSTR_STOP) {
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disable_runtime_instr();
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return 0;
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}
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if (command != S390_RUNTIME_INSTR_START)
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return -EINVAL;
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if (!current->thread.ri_cb) {
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cb = kzalloc_obj(*cb);
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if (!cb)
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return -ENOMEM;
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} else {
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cb = current->thread.ri_cb;
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memset(cb, 0, sizeof(*cb));
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}
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init_runtime_instr_cb(cb);
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/* now load the control block to make it available */
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preempt_disable();
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current->thread.ri_cb = cb;
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load_runtime_instr_cb(cb);
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preempt_enable();
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return 0;
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}
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