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An SMP-specific change: Remove an unnecessary lock acquire and release

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from every system call.  (Storing a 32-bit constant is inherently
atomic.)

Reviewed by:	Matthew Dillon <dillon@apollo.backplane.com>
This commit is contained in:
Alan Cox 1999-06-27 21:31:43 +00:00
parent 6e4989b255
commit fd56d8b7fe
3 changed files with 39 additions and 15 deletions
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18
sys/amd64/amd64/exception.S
View File

@ -30,7 +30,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: exception.s,v 1.60 1999/05/06 09:44:49 bde Exp $
* $Id: exception.s,v 1.61 1999/06/01 18:19:36 jlemon Exp $
*/
#include "npx.h"
@ -270,13 +270,17 @@ IDTVEC(syscall)
FAKE_MCOUNT(13*4(%esp))
MPLOCKED incl _cnt+V_SYSCALL
SYSCALL_LOCK
ECPL_LOCK
#if 0
ECPL_LOCK /* restore the locking if ... */
#endif
#ifdef CPL_AND_CML
movl $SWI_AST_MASK,_cml
#else
movl $SWI_AST_MASK,_cpl
movl $SWI_AST_MASK,_cpl /* this critical sections expands */
#endif
#if 0
ECPL_UNLOCK
#endif
call _syscall
/*
@ -307,13 +311,17 @@ IDTVEC(int0x80_syscall)
FAKE_MCOUNT(13*4(%esp))
MPLOCKED incl _cnt+V_SYSCALL
ALTSYSCALL_LOCK
ECPL_LOCK
#if 0
ECPL_LOCK /* restore the locking if ... */
#endif
#ifdef CPL_AND_CML
movl $SWI_AST_MASK,_cml
#else
movl $SWI_AST_MASK,_cpl
movl $SWI_AST_MASK,_cpl /* this critical sections expands */
#endif
#if 0
ECPL_UNLOCK
#endif
call _syscall
/*

18
sys/amd64/amd64/exception.s
View File

@ -30,7 +30,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: exception.s,v 1.60 1999/05/06 09:44:49 bde Exp $
* $Id: exception.s,v 1.61 1999/06/01 18:19:36 jlemon Exp $
*/
#include "npx.h"
@ -270,13 +270,17 @@ IDTVEC(syscall)
FAKE_MCOUNT(13*4(%esp))
MPLOCKED incl _cnt+V_SYSCALL
SYSCALL_LOCK
ECPL_LOCK
#if 0
ECPL_LOCK /* restore the locking if ... */
#endif
#ifdef CPL_AND_CML
movl $SWI_AST_MASK,_cml
#else
movl $SWI_AST_MASK,_cpl
movl $SWI_AST_MASK,_cpl /* this critical sections expands */
#endif
#if 0
ECPL_UNLOCK
#endif
call _syscall
/*
@ -307,13 +311,17 @@ IDTVEC(int0x80_syscall)
FAKE_MCOUNT(13*4(%esp))
MPLOCKED incl _cnt+V_SYSCALL
ALTSYSCALL_LOCK
ECPL_LOCK
#if 0
ECPL_LOCK /* restore the locking if ... */
#endif
#ifdef CPL_AND_CML
movl $SWI_AST_MASK,_cml
#else
movl $SWI_AST_MASK,_cpl
movl $SWI_AST_MASK,_cpl /* this critical sections expands */
#endif
#if 0
ECPL_UNLOCK
#endif
call _syscall
/*

18
sys/i386/i386/exception.s
View File

@ -30,7 +30,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: exception.s,v 1.60 1999/05/06 09:44:49 bde Exp $
* $Id: exception.s,v 1.61 1999/06/01 18:19:36 jlemon Exp $
*/
#include "npx.h"
@ -270,13 +270,17 @@ IDTVEC(syscall)
FAKE_MCOUNT(13*4(%esp))
MPLOCKED incl _cnt+V_SYSCALL
SYSCALL_LOCK
ECPL_LOCK
#if 0
ECPL_LOCK /* restore the locking if ... */
#endif
#ifdef CPL_AND_CML
movl $SWI_AST_MASK,_cml
#else
movl $SWI_AST_MASK,_cpl
movl $SWI_AST_MASK,_cpl /* this critical sections expands */
#endif
#if 0
ECPL_UNLOCK
#endif
call _syscall
/*
@ -307,13 +311,17 @@ IDTVEC(int0x80_syscall)
FAKE_MCOUNT(13*4(%esp))
MPLOCKED incl _cnt+V_SYSCALL
ALTSYSCALL_LOCK
ECPL_LOCK
#if 0
ECPL_LOCK /* restore the locking if ... */
#endif
#ifdef CPL_AND_CML
movl $SWI_AST_MASK,_cml
#else
movl $SWI_AST_MASK,_cpl
movl $SWI_AST_MASK,_cpl /* this critical sections expands */
#endif
#if 0
ECPL_UNLOCK
#endif
call _syscall
/*