xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

arch/tile: eliminate pt_regs trampolines for syscalls

Browse Source 
Using the new current_pt_regs() model, we can remove some trampolines
from assembly code and call directly to the C syscall implementations.
rt_sigreturn() and clone() still need some assembly wrapping, but no
longer are passed a pt_regs pointer.  sigaltstack() and the
tilepro-specific cmpxchg_badaddr() syscalls are now just straight C.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf
2012-10-23 13:30:54 -04:00
committed by Al Viro
parent 530550651f
commit 6b14e4198c
10 changed files with 39 additions and 57 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
arch/tile/kernel/process.c
View File

@@ -584,10 +584,10 @@ int do_work_pending(struct pt_regs *regs, u32 thread_info_flags)
}
/* Note there is an implicit fifth argument if (clone_flags & CLONE_SETTLS). */
SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp,
void __user *, parent_tidptr, void __user *, child_tidptr,
struct pt_regs *, regs)
SYSCALL_DEFINE4(clone, unsigned long, clone_flags, unsigned long, newsp,
void __user *, parent_tidptr, void __user *, child_tidptr)
{
struct pt_regs *regs = current_pt_regs();
if (!newsp)
newsp = regs->sp;
return do_fork(clone_flags, newsp, regs, 0,