Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

x32: Switch to a 64-bit clock_t

Browse source 
clock_t is used mainly to give the number of jiffies a certain process
has burned.  It is entirely feasible for a long-running process to
consume more than 2^32 jiffies especially in a multiprocess system.
As such, switch to a 64-bit clock_t for x32, just as we already
switched to a 64-bit time_t.

clock_t is only used in a handful of places, and as such it is really
not a very significant change.  The one that has the biggest impact is
in struct siginfo, but since the *size* of struct siginfo doesn't
change (it is padded to the hilt) it is fairly easy to make this a
localized change.

This also gets rid of sys_x32_times, however since this is a pretty
late change don't compactify the system call numbers; we can reuse
system call slot 521 next time we need an x32 system call.

Reported-by: Gregory M. Lueck <gregory.m.lueck@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: H. J. Lu <hjl.tools@gmail.com>
Link: http://lkml.kernel.org/r/1329696488-16970-1-git-send-email-hpa@zytor.com
This commit is contained in:
H. Peter Anvin 2012-03-05 13:40:24 -08:00
parent a628b684d2
commit e7084fd52e
3 changed files with 19 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
arch/x86/ia32/ia32_signal.c
View file

@ -37,6 +37,7 @@
int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
{
int err = 0;
bool ia32 = !is_ia32_task();
if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
return -EFAULT;
@ -66,8 +67,13 @@ int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
case __SI_FAULT >> 16:
break;
case __SI_CHLD >> 16:
put_user_ex(from->si_utime, &to->si_utime);
put_user_ex(from->si_stime, &to->si_stime);
if (ia32) {
put_user_ex(from->si_utime, &to->si_utime);
put_user_ex(from->si_stime, &to->si_stime);
} else {
put_user_ex(from->si_utime, &to->_sifields._sigchld_x32._utime);
put_user_ex(from->si_stime, &to->_sifields._sigchld_x32._stime);
}
put_user_ex(from->si_status, &to->si_status);
/* FALL THROUGH */
default:

9
arch/x86/include/asm/ia32.h
View file

@ -125,6 +125,15 @@ typedef struct compat_siginfo {
compat_clock_t _stime;
} _sigchld;
/* SIGCHLD (x32 version) */
struct {
unsigned int _pid; /* which child */
unsigned int _uid; /* sender's uid */
int _status; /* exit code */
s64 _utime;
s64 _stime;
} _sigchld_x32;
/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
struct {
unsigned int _addr; /* faulting insn/memory ref. */

4
arch/x86/syscalls/syscall_64.tbl
View file

@ -106,7 +106,7 @@
97 common getrlimit sys_getrlimit
98 common getrusage sys_getrusage
99 common sysinfo sys_sysinfo
100 64 times sys_times
100 common times sys_times
101 common ptrace sys_ptrace
102 common getuid sys_getuid
103 common syslog sys_syslog
@ -331,7 +331,7 @@
518 x32 sendmsg compat_sys_sendmsg
519 x32 recvmsg compat_sys_recvmsg
520 x32 execve stub_x32_execve
521 x32 times compat_sys_times
# 521 available
522 x32 rt_sigpending sys32_rt_sigpending
523 x32 rt_sigtimedwait compat_sys_rt_sigtimedwait
524 x32 rt_sigqueueinfo sys32_rt_sigqueueinfo