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OpenRISC updates for 5.6

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A few cleanups all over the place, things of note:
  - Enable the clone3 syscall
  - Remove CONFIG_CROSS_COMPILE from Krzysztof Kozlowski
  - Update to use mmgrab from Julia Lawall
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Merge tag 'for-linus' of git://github.com/openrisc/linux

Pull OpenRISC updates from Stafford Horne:
 "A few cleanups all over the place, things of note:

   - Enable the clone3 syscall

   - Remove CONFIG_CROSS_COMPILE from Krzysztof Kozlowski

   - Update to use mmgrab from Julia Lawall"

* tag 'for-linus' of git://github.com/openrisc/linux:
  openrisc: Remove obsolete show_trace_task function
  openrisc: Cleanup copy_thread_tls docs and comments
  openrisc: Enable the clone3 syscall
  openrisc: Convert copy_thread to copy_thread_tls
  openrisc: use mmgrab
  openrisc: configs: Cleanup CONFIG_CROSS_COMPILE
This commit is contained in:
Linus Torvalds 2020-04-07 12:33:37 -07:00
commit d5d247661e
8 changed files with 12 additions and 24 deletions
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4
Documentation/openrisc/openrisc_port.rst
View File

@ -37,8 +37,8 @@ or Stafford's toolchain build and release scripts.
Build the Linux kernel as usual::
make ARCH=openrisc defconfig
make ARCH=openrisc
make ARCH=openrisc CROSS_COMPILE="or1k-linux-" defconfig
make ARCH=openrisc CROSS_COMPILE="or1k-linux-"
3) Running on FPGA (optional)

1
arch/openrisc/Kconfig
View File

@ -16,6 +16,7 @@ config OPENRISC
select HANDLE_DOMAIN_IRQ
select GPIOLIB
select HAVE_ARCH_TRACEHOOK
select HAVE_COPY_THREAD_TLS
select SPARSE_IRQ
select GENERIC_IRQ_CHIP
select GENERIC_IRQ_PROBE

1
arch/openrisc/configs/or1ksim_defconfig
View File

@ -1,4 +1,3 @@
CONFIG_CROSS_COMPILE="or1k-linux-"
CONFIG_NO_HZ=y
CONFIG_LOG_BUF_SHIFT=14
CONFIG_BLK_DEV_INITRD=y

1
arch/openrisc/configs/simple_smp_defconfig
View File

@ -1,4 +1,3 @@
CONFIG_CROSS_COMPILE="or1k-linux-"
CONFIG_LOCALVERSION="-simple-smp"
CONFIG_NO_HZ=y
CONFIG_LOG_BUF_SHIFT=14

1
arch/openrisc/include/uapi/asm/unistd.h
View File

@ -24,6 +24,7 @@
#define __ARCH_WANT_SET_GET_RLIMIT
#define __ARCH_WANT_SYS_FORK
#define __ARCH_WANT_SYS_CLONE
#define __ARCH_WANT_SYS_CLONE3
#define __ARCH_WANT_TIME32_SYSCALLS
#include <asm-generic/unistd.h>

18
arch/openrisc/kernel/process.c
View File

@ -117,12 +117,12 @@ void release_thread(struct task_struct *dead_task)
extern asmlinkage void ret_from_fork(void);
/*
* copy_thread
* copy_thread_tls
* @clone_flags: flags
* @usp: user stack pointer or fn for kernel thread
* @arg: arg to fn for kernel thread; always NULL for userspace thread
* @p: the newly created task
* @regs: CPU context to copy for userspace thread; always NULL for kthread
* @tls: the Thread Local Storage pointer for the new process
*
* At the top of a newly initialized kernel stack are two stacked pt_reg
* structures. The first (topmost) is the userspace context of the thread.
@ -148,8 +148,8 @@ extern asmlinkage void ret_from_fork(void);
*/
int
copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long arg, struct task_struct *p)
copy_thread_tls(unsigned long clone_flags, unsigned long usp,
unsigned long arg, struct task_struct *p, unsigned long tls)
{
struct pt_regs *userregs;
struct pt_regs *kregs;
@ -179,16 +179,10 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
userregs->sp = usp;
/*
* For CLONE_SETTLS set "tp" (r10) to the TLS pointer passed to sys_clone.
*
* The kernel entry is:
* int clone (long flags, void *child_stack, int *parent_tid,
* int *child_tid, struct void *tls)
*
* This makes the source r7 in the kernel registers.
* For CLONE_SETTLS set "tp" (r10) to the TLS pointer.
*/
if (clone_flags & CLONE_SETTLS)
userregs->gpr[10] = userregs->gpr[7];
userregs->gpr[10] = tls;
userregs->gpr[11] = 0; /* Result from fork() */

3
arch/openrisc/kernel/smp.c
View File

@ -14,6 +14,7 @@
#include <linux/smp.h>
#include <linux/cpu.h>
#include <linux/sched.h>
#include <linux/sched/mm.h>
#include <linux/irq.h>
#include <asm/cpuinfo.h>
#include <asm/mmu_context.h>
@ -113,7 +114,7 @@ asmlinkage __init void secondary_start_kernel(void)
* All kernel threads share the same mm context; grab a
* reference and switch to it.
*/
atomic_inc(&mm->mm_count);
mmgrab(mm);
current->active_mm = mm;
cpumask_set_cpu(cpu, mm_cpumask(mm));

7
arch/openrisc/kernel/traps.c
View File

@ -55,13 +55,6 @@ void show_stack(struct task_struct *task, unsigned long *esp)
unwind_stack(NULL, esp, print_trace);
}
void show_trace_task(struct task_struct *tsk)
{
/*
* TODO: SysRq-T trace dump...
*/
}
void show_registers(struct pt_regs *regs)
{
int i;