diff options
| author | Jeff Dike <jdike@addtoit.com> | 2008-02-04 22:31:29 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-05 09:44:32 -0800 |
| commit | f87ea91d988637b3bbf6aa2d281c6010e7d5f48d (patch) | |
| tree | e93fa224b495af740537a25faa1c6d45e4a9d376 /arch/um/sys-x86_64 | |
| parent | 966f1d8f344bcec3db7d774a4ba3ab0dedfad873 (diff) | |
uml: redo the calculation of NR_syscalls
Redo the calculation of NR_syscalls since that disappeared from i386 and
use a similar mechanism on x86_64.
We now figure out the size of the system call table in arch code and stick
that in syscall_table_size. arch/um/kernel/skas/syscall.c defines
NR_syscalls in terms of that since its the only thing that needs to know
how many system calls there are.
The old mechananism that was used on x86_64 is gone.
arch/um/include/sysdep-i386/syscalls.h got some formatting since I was
looking at it.
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um/sys-x86_64')
| -rw-r--r-- | arch/um/sys-x86_64/syscall_table.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/arch/um/sys-x86_64/syscall_table.c b/arch/um/sys-x86_64/syscall_table.c index 555faee0d81..c128eb89700 100644 --- a/arch/um/sys-x86_64/syscall_table.c +++ b/arch/um/sys-x86_64/syscall_table.c @@ -52,11 +52,19 @@ typedef void (*sys_call_ptr_t)(void); extern void sys_ni_syscall(void); -sys_call_ptr_t sys_call_table[UM_NR_syscall_max+1] __cacheline_aligned = { - /* - * Smells like a like a compiler bug -- it doesn't work when the & - * below is removed. - */ - [0 ... UM_NR_syscall_max] = &sys_ni_syscall, +/* + * We used to have a trick here which made sure that holes in the + * x86_64 table were filled in with sys_ni_syscall, but a comment in + * unistd_64.h says that holes aren't allowed, so the trick was + * removed. + * The trick looked like this + * [0 ... UM_NR_syscall_max] = &sys_ni_syscall + * before including unistd_64.h - the later initializations overwrote + * the sys_ni_syscall filler. + */ + +sys_call_ptr_t sys_call_table[] __cacheline_aligned = { #include <asm-x86/unistd_64.h> }; + +int syscall_table_size = sizeof(sys_call_table); |