[PATCH] CONFIG_GENERIC_SIGALTSTACK build breakage with asm-generic/syscalls.h

[Vineet Gupta]

For arches which include asm-generic/syscalls.h as well as newly
introduced CONFIG_GENERIC_SIGALTSTACK, there's a build breakage due to
conflicting prototypes of sys_sigaltstack(), due to removal of struct
pt_regs from latter based code.

----------------------->8-------------------------
In file included from
/home/vineetg/arc/upstream-kernel/arch/arc/include/asm/syscalls.h:25,
                 from arch/arc/kernel/sys.c:6:
include/asm-generic/syscalls.h:26: error: conflicting types for
'sys_sigaltstack'
include/linux/syscalls.h:304: note: previous declaration of
'sys_sigaltstack' was here
make[2]: *** [arch/arc/kernel/sys.o] Error 1
----------------------->8-------------------------

Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
Cc: james.hogan@xxxxxxxxxx
Cc: arnd@xxxxxxxx
Cc: torvalds@xxxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-arch@xxxxxxxxxxxxxxx
---
 include/asm-generic/syscalls.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/include/asm-generic/syscalls.h b/include/asm-generic/syscalls.h
index 58f466f..1db51b8 100644
--- a/include/asm-generic/syscalls.h
+++ b/include/asm-generic/syscalls.h
@@ -21,10 +21,12 @@ asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
 			unsigned long fd, off_t pgoff);
 #endif
 
+#ifndef CONFIG_GENERIC_SIGALTSTACK
 #ifndef sys_sigaltstack
 asmlinkage long sys_sigaltstack(const stack_t __user *, stack_t __user *,
 			struct pt_regs *);
 #endif
+#endif
 
 #ifndef sys_rt_sigreturn
 asmlinkage long sys_rt_sigreturn(struct pt_regs *regs);
-- 
1.7.4.1

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