Re: [PATCH 1/5] parisc: Avoid compat syscalls when COMPAT=n

On Wed, 8 Apr 2026, Helge Deller wrote:

> From: Helge Deller <[email protected]>
> 
> Drop unnecessary code and syscall tables when we run a 64-bit
> kernel with conpat mode disabled.
> 
> Signed-off-by: Helge Deller <[email protected]>

Hi

Where can I download 64-bit parisc userspace? I am interested in trying 
it.

Mikulas

> ---
>  arch/parisc/kernel/syscall.S | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S
> index f58c4bccfbce..bc5421ca537f 100644
> --- a/arch/parisc/kernel/syscall.S
> +++ b/arch/parisc/kernel/syscall.S
> @@ -241,7 +241,7 @@ linux_gateway_entry:
>  	/* Note!  We cannot use the syscall table that is mapped
>  	nearby since the gateway page is mapped execute-only. */
>  
> -#ifdef CONFIG_64BIT
> +#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
>  	ldil	L%sys_call_table, %r1
>  	or,ev	%r2,%r2,%r2
>  	ldil	L%sys_call_table64, %r1
> @@ -250,7 +250,7 @@ linux_gateway_entry:
>  	ldo	R%sys_call_table64(%r1), %r19
>  #else
>  	load32	sys_call_table, %r19
> -#endif	
> +#endif
>  	comiclr,>>	__NR_Linux_syscalls, %r20, %r0
>  	b,n	.Lsyscall_nosys
>  	
> @@ -374,7 +374,7 @@ tracesys_next:
>  	/* Note!  We cannot use the syscall table that is mapped
>  	nearby since the gateway page is mapped execute-only. */
>  
> -#ifdef CONFIG_64BIT
> +#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
>  	LDREG	TASK_PT_GR30(%r1), %r19		/* get users sp back */
>  	extrd,u	%r19,63,1,%r2			/* W hidden in bottom bit */
>  
> @@ -1326,16 +1326,19 @@ ENTRY(lws_table)
>  END(lws_table)
>  	/* End of lws table */
>  
> -#ifdef CONFIG_64BIT
> +#ifdef CONFIG_COMPAT
>  #define __SYSCALL_WITH_COMPAT(nr, native, compat)	__SYSCALL(nr, compat)
>  #else
>  #define __SYSCALL_WITH_COMPAT(nr, native, compat)	__SYSCALL(nr, native)
>  #endif
>  #define __SYSCALL(nr, entry)	ASM_ULONG_INSN entry
> +
>  	.align 8
>  ENTRY(sys_call_table)
>  	.export sys_call_table,data
> +#if defined(CONFIG_COMPAT) || !defined(CONFIG_64BIT)
>  #include <asm/syscall_table_32.h>    /* 32-bit syscalls */
> +#endif
>  END(sys_call_table)
>  
>  #ifdef CONFIG_64BIT
> -- 
> 2.53.0
> 
>