[PATCHv5,14/21] arm64: drop alignment from syscall tables

Message ID 20180711135656.20670-15-mark.rutland@arm.com
State Accepted
Commit 80d63bc39f9ace9c1d2bef7f921d2f3ef2037d4b
Headers show
Series
  • arm64: invoke syscalls with pt_regs
Related show

Commit Message

Mark Rutland July 11, 2018, 1:56 p.m.
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: Mark Rutland <mark.rutland@arm.com>

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
---
 arch/arm64/kernel/sys.c   | 6 +-----
 arch/arm64/kernel/sys32.c | 6 +-----
 2 files changed, 2 insertions(+), 10 deletions(-)

-- 
2.11.0

Patch

diff --git a/arch/arm64/kernel/sys.c b/arch/arm64/kernel/sys.c
index 7f0907261269..df8180175515 100644
--- a/arch/arm64/kernel/sys.c
+++ b/arch/arm64/kernel/sys.c
@@ -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>
 };
diff --git a/arch/arm64/kernel/sys32.c b/arch/arm64/kernel/sys32.c
index d993214118aa..4ddeaae90128 100644
--- a/arch/arm64/kernel/sys32.c
+++ b/arch/arm64/kernel/sys32.c
@@ -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>
 };