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Commit 80d63bc3 authored by Mark Rutland's avatar Mark Rutland Committed by Will Deacon
Browse files

arm64: drop alignment from syscall tables 



Our syscall tables are aligned to 4096 bytes, which allowed their
addresses to be generated with a single adrp in entry.S. This has the
unfortunate property of wasting space in .rodata for the necessary
padding.

Now that the address is generated by C code, we can rely on the compiler
to do the right thing, and drop the alignemnt.

Signed-off-by: default avatarMark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent baaa7237

arch/arm64/kernel/sys.c

+1 −5
Original line number Diff line number Diff line
@@ -56,11 +56,7 @@ asmlinkage long sys_rt_sigreturn(void); 
#undef __SYSCALL

#define __SYSCALL(nr, sym)	[nr] = (syscall_fn_t)sym,



/*

 * The sys_call_table array must be 4K aligned to be accessible from

 * kernel/entry.S.

 */

const syscall_fn_t sys_call_table[__NR_syscalls] __aligned(4096) = {

const syscall_fn_t sys_call_table[__NR_syscalls] = {

	[0 ... __NR_syscalls - 1] = (syscall_fn_t)sys_ni_syscall,

#include <asm/unistd.h>

};

arch/arm64/kernel/sys32.c

+1 −5
Original line number Diff line number Diff line
@@ -44,11 +44,7 @@ asmlinkage long compat_sys_mmap2_wrapper(void); 
#undef __SYSCALL

#define __SYSCALL(nr, sym)	[nr] = (syscall_fn_t)sym,



/*

 * The sys_call_table array must be 4K aligned to be accessible from

 * kernel/entry.S.

 */

const syscall_fn_t compat_sys_call_table[__NR_compat_syscalls] __aligned(4096) = {

const syscall_fn_t compat_sys_call_table[__NR_compat_syscalls] = {

	[0 ... __NR_compat_syscalls - 1] = (syscall_fn_t)sys_ni_syscall,

#include <asm/unistd32.h>

};