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s390/syscalls: Use define instead of '1' to indicate PER trap

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Make the code a bit easier to read by defining SYSCALL_PER_TRAP
instead of passing '1' to __do_syscall().

Suggested-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Sven Schnelle 2026-07-09 21:55:00 +02:00 committed by Vasily Gorbik
parent f588c5cb0b
commit 5c92744c1f
3 changed files with 5 additions and 4 deletions
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2
arch/s390/kernel/entry.S
View File

@ -368,7 +368,7 @@ SYM_CODE_START(pgm_check_handler)
mvc __LC_RETURN_PSW(8,%r13),__LC_SVC_NEW_PSW(%r13)
larl %r14,.Lsysc_per
stg %r14,__LC_RETURN_PSW+8(%r13)
lghi %r14,1
lghi %r14,SYSCALL_FLAG_PER_TRAP
LBEAR __LC_PGM_LAST_BREAK(%r13)
LPSWEY __LC_RETURN_PSW,__LC_RETURN_LPSWE # branch to .Lsysc_per
SYM_CODE_END(pgm_check_handler)

3
arch/s390/kernel/entry.h
View File

@ -3,6 +3,7 @@
#define _ENTRY_H
#define PGM_FLAG_GUEST_FAULT 1
#define SYSCALL_FLAG_PER_TRAP 1
#ifndef __ASSEMBLER__
@ -26,7 +27,7 @@ void early_pgm_check_handler(void);
struct task_struct *__switch_to_asm(struct task_struct *prev, struct task_struct *next);
void __ret_from_fork(struct task_struct *prev, struct pt_regs *regs);
void __do_pgm_check(struct pt_regs *regs, unsigned long flags);
void __do_syscall(struct pt_regs *regs, int per_trap);
void __do_syscall(struct pt_regs *regs, unsigned long flags);
void __do_early_pgm_check(struct pt_regs *regs);
void do_protection_exception(struct pt_regs *regs);

4
arch/s390/kernel/syscall.c
View File

@ -93,7 +93,7 @@ SYSCALL_DEFINE0(ni_syscall)
return -ENOSYS;
}
void noinstr __do_syscall(struct pt_regs *regs, int per_trap)
void noinstr __do_syscall(struct pt_regs *regs, unsigned long flags)
{
unsigned long nr;
@ -106,7 +106,7 @@ void noinstr __do_syscall(struct pt_regs *regs, int per_trap)
current->thread.last_break = regs->last_break;
local_irq_enable();
regs->orig_gpr2 = regs->gprs[2];
if (unlikely(per_trap))
if (unlikely(flags & SYSCALL_FLAG_PER_TRAP))
set_thread_flag(TIF_PER_TRAP);
regs->flags = 0;
set_pt_regs_flag(regs, PIF_SYSCALL);