mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Roland McGrath](/assets/img/avatar_default.png)
We fixed this bug before, but it didn't take. It may have been the case that the problem was first noticed to occur in a CONFIG_REGPARM compile. But it's not regparm functions that need not to make tail calls, it's asmlinkage functions called with a user pt_regs frame on the stack supplying their arguments. prevent_tail_call probably doesn't do anything at all in regparm functions (your argument registers are going to be clobbered, period). It was a braino to conditionalize that definition in the first place. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
15 lines
391 B
C
15 lines
391 B
C
#ifndef __ASM_LINKAGE_H
|
|
#define __ASM_LINKAGE_H
|
|
|
|
#define asmlinkage CPP_ASMLINKAGE __attribute__((regparm(0)))
|
|
#define FASTCALL(x) x __attribute__((regparm(3)))
|
|
#define fastcall __attribute__((regparm(3)))
|
|
|
|
#define prevent_tail_call(ret) __asm__ ("" : "=r" (ret) : "0" (ret))
|
|
|
|
#ifdef CONFIG_X86_ALIGNMENT_16
|
|
#define __ALIGN .align 16,0x90
|
|
#define __ALIGN_STR ".align 16,0x90"
|
|
#endif
|
|
|
|
#endif
|