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x86/syscalls: Stop filling syscall arrays with *_sys_ni_syscall 

This is a follow-up cleanup after switching to the generic syscalltbl.sh.

The old x86 specific script skipped non-existing syscalls. So, the
generated syscalls_64.h, for example, had a big hole in the syscall numbers
335-423 range. That is why there exists [0 ... __NR_*_syscall_max] =
&__*_sys_ni_cyscall.

The new script, scripts/syscalltbl.sh automatically fills holes
with __SYSCALL(<nr>, sys_ni_syscall), hence such ugly code can
go away. The designated initializers, '[nr] =' are also unneeded.

Also, there is no need to give __NR_*_syscall_max+1 because the array
size is implied by the number of syscalls in the generated headers.
Hence, there is no need to include <asm/unistd.h>, either.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210517073815.97426-4-masahiroy@kernel.org
This commit is contained in:
Masahiro Yamada 2021-05-17 16:38:11 +09:00 committed by Thomas Gleixner
parent 6218d0f6b8
commit 44fe4895f4
5 changed files with 6 additions and 36 deletions
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10
arch/x86/entry/syscall_32.c
View File

@ -5,7 +5,6 @@
#include <linux/sys.h>
#include <linux/cache.h>
#include <linux/syscalls.h>
#include <asm/unistd.h>
#include <asm/syscall.h>
#ifdef CONFIG_IA32_EMULATION
@ -19,13 +18,8 @@
#include <asm/syscalls_32.h>
#undef __SYSCALL
#define __SYSCALL(nr, sym) [nr] = __ia32_##sym,
#define __SYSCALL(nr, sym) __ia32_##sym,
__visible const sys_call_ptr_t ia32_sys_call_table[__NR_ia32_syscall_max+1] = {
/*
* Smells like a compiler bug -- it doesn't work
* when the & below is removed.
*/
[0 ... __NR_ia32_syscall_max] = &__ia32_sys_ni_syscall,
__visible const sys_call_ptr_t ia32_sys_call_table[] = {
#include <asm/syscalls_32.h>
};

10
arch/x86/entry/syscall_64.c
View File

@ -5,20 +5,14 @@
#include <linux/sys.h>
#include <linux/cache.h>
#include <linux/syscalls.h>
#include <asm/unistd.h>
#include <asm/syscall.h>
#define __SYSCALL(nr, sym) extern long __x64_##sym(const struct pt_regs *);
#include <asm/syscalls_64.h>
#undef __SYSCALL
#define __SYSCALL(nr, sym) [nr] = __x64_##sym,
#define __SYSCALL(nr, sym) __x64_##sym,
asmlinkage const sys_call_ptr_t sys_call_table[__NR_syscall_max+1] = {
/*
* Smells like a compiler bug -- it doesn't work
* when the & below is removed.
*/
[0 ... __NR_syscall_max] = &__x64_sys_ni_syscall,
asmlinkage const sys_call_ptr_t sys_call_table[] = {
#include <asm/syscalls_64.h>
};

10
arch/x86/entry/syscall_x32.c
View File

@ -5,20 +5,14 @@
#include <linux/sys.h>
#include <linux/cache.h>
#include <linux/syscalls.h>
#include <asm/unistd.h>
#include <asm/syscall.h>
#define __SYSCALL(nr, sym) extern long __x64_##sym(const struct pt_regs *);
#include <asm/syscalls_x32.h>
#undef __SYSCALL
#define __SYSCALL(nr, sym) [nr] = __x64_##sym,
#define __SYSCALL(nr, sym) __x64_##sym,
asmlinkage const sys_call_ptr_t x32_sys_call_table[__NR_x32_syscall_max+1] = {
/*
* Smells like a compiler bug -- it doesn't work
* when the & below is removed.
*/
[0 ... __NR_x32_syscall_max] = &__x64_sys_ni_syscall,
asmlinkage const sys_call_ptr_t x32_sys_call_table[] = {
#include <asm/syscalls_x32.h>
};

6
arch/x86/um/sys_call_table_32.c
View File

@ -7,7 +7,6 @@
#include <linux/linkage.h>
#include <linux/sys.h>
#include <linux/cache.h>
#include <asm/unistd.h>
#include <asm/syscall.h>
#define __NO_STUBS
@ -37,11 +36,6 @@
extern asmlinkage long sys_ni_syscall(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long);
const sys_call_ptr_t sys_call_table[] ____cacheline_aligned = {
/*
* Smells like a compiler bug -- it doesn't work
* when the & below is removed.
*/
[0 ... __NR_syscall_max] = &sys_ni_syscall,
#include <asm/syscalls_32.h>
};

6
arch/x86/um/sys_call_table_64.c
View File

@ -7,7 +7,6 @@
#include <linux/linkage.h>
#include <linux/sys.h>
#include <linux/cache.h>
#include <asm/unistd.h>
#include <asm/syscall.h>
#define __NO_STUBS
@ -45,11 +44,6 @@
extern asmlinkage long sys_ni_syscall(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long);
const sys_call_ptr_t sys_call_table[] ____cacheline_aligned = {
/*
* Smells like a compiler bug -- it doesn't work
* when the & below is removed.
*/
[0 ... __NR_syscall_max] = &sys_ni_syscall,
#include <asm/syscalls_64.h>
};