linux-kernel - [RFC PATCH 7/8] s390/syscalls: Remove system call table pointer from thread

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Message-ID: <20251110185440.2667511-8-hca@linux.ibm.com>
Date: Mon, 10 Nov 2025 19:54:39 +0100
From: Heiko Carstens <hca@...ux.ibm.com>
To: Alexander Gordeev <agordeev@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Andreas Krebbel <krebbel@...ux.ibm.com>, Arnd Bergmann <arnd@...db.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: [RFC PATCH 7/8] s390/syscalls: Remove system call table pointer from thread_struct

With compat support gone there is only one system call table
left. Therefore remove the sys_call_table pointer from
thread_struct and use the sys_call_table directly.

Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
---
 arch/s390/include/asm/elf.h       | 1 -
 arch/s390/include/asm/processor.h | 1 -
 arch/s390/kernel/syscall.c        | 2 +-
 3 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/s390/include/asm/elf.h b/arch/s390/include/asm/elf.h
index 2b6ab483b1ca..bb63fa4d20bb 100644
--- a/arch/s390/include/asm/elf.h
+++ b/arch/s390/include/asm/elf.h
@@ -217,7 +217,6 @@ extern char elf_platform[];
 do {								\
 	set_personality(PER_LINUX |				\
 		(current->personality & (~PER_MASK)));		\
-	current->thread.sys_call_table = sys_call_table;	\
 } while (0)
 
 /*
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index e3e3230aaf11..44d558fb8422 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -175,7 +175,6 @@ struct thread_struct {
 	unsigned long system_timer;		/* task cputime in kernel space */
 	unsigned long hardirq_timer;		/* task cputime in hardirq context */
 	unsigned long softirq_timer;		/* task cputime in softirq context */
-	const sys_call_ptr_t *sys_call_table;	/* system call table address */
 	union teid gmap_teid;			/* address and flags of last gmap fault */
 	unsigned int gmap_int_code;		/* int code of last gmap fault */
 	int ufpu_flags;				/* user fpu flags */
diff --git a/arch/s390/kernel/syscall.c b/arch/s390/kernel/syscall.c
index 4fee74553ca2..3b7ea1ef468a 100644
--- a/arch/s390/kernel/syscall.c
+++ b/arch/s390/kernel/syscall.c
@@ -122,7 +122,7 @@ void noinstr __do_syscall(struct pt_regs *regs, int per_trap)
 		goto out;
 	regs->gprs[2] = -ENOSYS;
 	if (likely(nr < NR_syscalls))
-		regs->gprs[2] = current->thread.sys_call_table[nr](regs);
+		regs->gprs[2] = sys_call_table[nr](regs);
 out:
 	syscall_exit_to_user_mode(regs);
 }
-- 
2.48.1