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syscall_user_dispatch: Introduce ARCH_SUPPORTS_SYSCALL_USER_DISPATCH

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Currently, only x86 genuinely implements and supports Syscall User Dispatch
(SUD).

Multiple architectures provide a stub arch_syscall_is_vdso_sigreturn()
returning 'false' simply to satisfy GENERIC_ENTRY compilation, which
creates a false impression of feature support.

Introduce ARCH_SUPPORTS_SYSCALL_USER_DISPATCH to decouple this mechanism
from GENERIC_ENTRY. Select it exclusively on x86 and remove the redundant
stub functions from other architectures.

Suggested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Reviewed-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Link: https://patch.msgid.link/20260713035422.582771-1-ruanjinjie@huawei.com
This commit is contained in:
Jinjie Ruan
2026-07-14 16:34:07 +02:00
committed by Thomas Gleixner
parent 4a3591287f
commit 8383e05af7
6 changed files with 5 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/Kconfig
+4
View File
@@ -114,8 +114,12 @@ config GENERIC_ENTRY
select GENERIC_IRQ_ENTRY
select GENERIC_SYSCALL
config ARCH_SUPPORTS_SYSCALL_USER_DISPATCH
bool
config SYSCALL_USER_DISPATCH
bool "Syscall User Dispatch"
depends on ARCH_SUPPORTS_SYSCALL_USER_DISPATCH
depends on GENERIC_ENTRY
default y
help
arch/loongarch/include/asm/syscall.h
-6
View File
@@ -84,10 +84,4 @@ static inline int syscall_get_arch(struct task_struct *task)
return AUDIT_ARCH_LOONGARCH64;
#endif
}
static inline bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs)
{
return false;
}
#endif /* __ASM_LOONGARCH_SYSCALL_H */
arch/powerpc/include/asm/syscall.h
-5
View File
@@ -139,9 +139,4 @@ static inline int syscall_get_arch(struct task_struct *task)
else
return AUDIT_ARCH_PPC64;
}
static inline bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs)
{
return false;
}
#endif /* _ASM_SYSCALL_H */
arch/riscv/include/asm/syscall.h
-5
View File
@@ -112,11 +112,6 @@ static inline void syscall_handler(struct pt_regs *regs, ulong syscall)
regs->a0 = fn(regs);
}
static inline bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs)
{
return false;
}
asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t);
asmlinkage long sys_riscv_hwprobe(struct riscv_hwprobe *, size_t, size_t,
arch/s390/include/asm/syscall.h
-5
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@@ -89,11 +89,6 @@ static inline int syscall_get_arch(struct task_struct *task)
return AUDIT_ARCH_S390X;
}
static inline bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs)
{
return false;
}
#define SYSCALL_FMT_0
#define SYSCALL_FMT_1 , "0" (r2)
#define SYSCALL_FMT_2 , "d" (r3) SYSCALL_FMT_1
arch/x86/Kconfig
+1
View File
@@ -335,6 +335,7 @@ config X86
select SCHED_SMT if SMP
select ARCH_SUPPORTS_SCHED_CLUSTER if SMP
select ARCH_SUPPORTS_SCHED_MC if SMP
select ARCH_SUPPORTS_SYSCALL_USER_DISPATCH
select HAVE_SINGLE_FTRACE_DIRECT_OPS if X86_64 && DYNAMIC_FTRACE_WITH_DIRECT_CALLS
config INSTRUCTION_DECODER