lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[PATCH] s390: atomic primitives

Browse Source 
Hugh Dickins <hugh@veritas.com>

Fix the broken atomic_cmpxchg primitive.  Add atomic_sub_and_test,
atomic64_sub_return, atomic64_sub_and_test, atomic64_cmpxchg,
atomic64_add_unless and atomic64_inc_not_zero.  Replace old style
atomic_compare_and_swap by atomic_cmpxchg.  Shorten the whole header by
defining most primitives with the two inline functions atomic_add_return and
atomic_sub_return.

In addition this patch contains the s390 related fixes of Hugh's "mm: fill
arch atomic64 gaps" patch.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Martin Schwidefsky
2006-01-06 00:19:07 -08:00
committed by Linus Torvalds
parent 8d93c700a4
commit 973bd99375
10 changed files with 97 additions and 132 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/s390/kernel/machine_kexec.c
View File

@@ -85,7 +85,7 @@ kexec_halt_all_cpus(void *kernel_image)
pfault_fini();
#endif
if (atomic_compare_and_swap(-1, smp_processor_id(), &cpuid))
if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) != -1)
signal_processor(smp_processor_id(), sigp_stop);
/* Wait for all other cpus to enter stopped state */

6
arch/s390/kernel/smp.c
View File

@@ -263,7 +263,7 @@ static void do_machine_restart(void * __unused)
int cpu;
static atomic_t cpuid = ATOMIC_INIT(-1);
if (atomic_compare_and_swap(-1, smp_processor_id(), &cpuid))
if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) != -1)
signal_processor(smp_processor_id(), sigp_stop);
/* Wait for all other cpus to enter stopped state */
@@ -313,7 +313,7 @@ static void do_machine_halt(void * __unused)
{
static atomic_t cpuid = ATOMIC_INIT(-1);
if (atomic_compare_and_swap(-1, smp_processor_id(), &cpuid) == 0) {
if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) == -1) {
smp_send_stop();
if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
cpcmd(vmhalt_cmd, NULL, 0, NULL);
@@ -332,7 +332,7 @@ static void do_machine_power_off(void * __unused)
{
static atomic_t cpuid = ATOMIC_INIT(-1);
if (atomic_compare_and_swap(-1, smp_processor_id(), &cpuid) == 0) {
if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) == -1) {
smp_send_stop();
if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
cpcmd(vmpoff_cmd, NULL, 0, NULL);