* [Qemu-devel] [PATCH for-2.8] qtail: clean up direct access to tqe_prev field
@ 2016-07-25 12:47 Igor Mammedov
2016-08-01 10:05 ` Paolo Bonzini
0 siblings, 1 reply; 2+ messages in thread
From: Igor Mammedov @ 2016-07-25 12:47 UTC (permalink / raw)
To: qemu-devel
Cc: Markus Armbruster, Kevin Wolf, Max Reitz, Paolo Bonzini,
Peter Crosthwaite, Richard Henderson, Jason Wang,
open list:Block layer core
instead of accessing tqe_prev field dircetly outside
of queue.h use macros to check if element is in list
and make sure that afer element is removed from list
tqe_prev field could be used to do the same check.
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
The patch is split from as cleanup is not urgent
[PATCH 0/6] Fix migration issues with arbitrary cpu-hot(un)plug
and made on top of
[PATCH v2 0/6] Fix migration issues with arbitrary cpu-hot(un)plug
posting it to list so that it won't be forgotten or lost
and affected people could review it at there leisure time.
---
include/qemu/queue.h | 2 ++
blockdev.c | 2 +-
exec.c | 3 +--
net/filter.c | 2 +-
4 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/include/qemu/queue.h b/include/qemu/queue.h
index c2b6c81..342073f 100644
--- a/include/qemu/queue.h
+++ b/include/qemu/queue.h
@@ -407,6 +407,7 @@ struct { \
else \
(head)->tqh_last = (elm)->field.tqe_prev; \
*(elm)->field.tqe_prev = (elm)->field.tqe_next; \
+ (elm)->field.tqe_prev = NULL; \
} while (/*CONSTCOND*/0)
#define QTAILQ_FOREACH(var, head, field) \
@@ -430,6 +431,7 @@ struct { \
#define QTAILQ_EMPTY(head) ((head)->tqh_first == NULL)
#define QTAILQ_FIRST(head) ((head)->tqh_first)
#define QTAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
+#define QTAILQ_IN_USE(elm, field) ((elm)->field.tqe_prev != NULL)
#define QTAILQ_LAST(head, headname) \
(*(((struct headname *)((head)->tqh_last))->tqh_last))
diff --git a/blockdev.c b/blockdev.c
index eafeba9..0b73158 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -4031,7 +4031,7 @@ void qmp_x_blockdev_del(bool has_id, const char *id,
goto out;
}
- if (!blk && !bs->monitor_list.tqe_prev) {
+ if (!blk && !QTAILQ_IN_USE(bs, monitor_list)) {
error_setg(errp, "Node %s is not owned by the monitor",
bs->node_name);
goto out;
diff --git a/exec.c b/exec.c
index 50e3ee2..8e8416b 100644
--- a/exec.c
+++ b/exec.c
@@ -614,14 +614,13 @@ void cpu_exec_exit(CPUState *cpu)
CPUClass *cc = CPU_GET_CLASS(cpu);
cpu_list_lock();
- if (cpu->node.tqe_prev == NULL) {
+ if (!QTAILQ_IN_USE(cpu, node)) {
/* there is nothing to undo since cpu_exec_init() hasn't been called */
cpu_list_unlock();
return;
}
QTAILQ_REMOVE(&cpus, cpu, node);
- cpu->node.tqe_prev = NULL;
cpu->cpu_index = UNASSIGNED_CPU_INDEX;
cpu_list_unlock();
diff --git a/net/filter.c b/net/filter.c
index 888fe6d..1dfd2ca 100644
--- a/net/filter.c
+++ b/net/filter.c
@@ -239,7 +239,7 @@ static void netfilter_finalize(Object *obj)
}
if (nf->netdev && !QTAILQ_EMPTY(&nf->netdev->filters) &&
- nf->next.tqe_prev) {
+ QTAILQ_IN_USE(nf, next)) {
QTAILQ_REMOVE(&nf->netdev->filters, nf, next);
}
g_free(nf->netdev_id);
--
2.7.4
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [Qemu-devel] [PATCH for-2.8] qtail: clean up direct access to tqe_prev field
2016-07-25 12:47 [Qemu-devel] [PATCH for-2.8] qtail: clean up direct access to tqe_prev field Igor Mammedov
@ 2016-08-01 10:05 ` Paolo Bonzini
0 siblings, 0 replies; 2+ messages in thread
From: Paolo Bonzini @ 2016-08-01 10:05 UTC (permalink / raw)
To: Igor Mammedov, qemu-devel
Cc: Markus Armbruster, Kevin Wolf, Max Reitz, Peter Crosthwaite,
Richard Henderson, Jason Wang, open list:Block layer core
On 25/07/2016 14:47, Igor Mammedov wrote:
> instead of accessing tqe_prev field dircetly outside
> of queue.h use macros to check if element is in list
> and make sure that afer element is removed from list
> tqe_prev field could be used to do the same check.
>
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> ---
> The patch is split from as cleanup is not urgent
> [PATCH 0/6] Fix migration issues with arbitrary cpu-hot(un)plug
> and made on top of
> [PATCH v2 0/6] Fix migration issues with arbitrary cpu-hot(un)plug
>
> posting it to list so that it won't be forgotten or lost
> and affected people could review it at there leisure time.
>
> ---
> include/qemu/queue.h | 2 ++
> blockdev.c | 2 +-
> exec.c | 3 +--
> net/filter.c | 2 +-
> 4 files changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/include/qemu/queue.h b/include/qemu/queue.h
> index c2b6c81..342073f 100644
> --- a/include/qemu/queue.h
> +++ b/include/qemu/queue.h
> @@ -407,6 +407,7 @@ struct { \
> else \
> (head)->tqh_last = (elm)->field.tqe_prev; \
> *(elm)->field.tqe_prev = (elm)->field.tqe_next; \
> + (elm)->field.tqe_prev = NULL; \
> } while (/*CONSTCOND*/0)
>
> #define QTAILQ_FOREACH(var, head, field) \
> @@ -430,6 +431,7 @@ struct { \
> #define QTAILQ_EMPTY(head) ((head)->tqh_first == NULL)
> #define QTAILQ_FIRST(head) ((head)->tqh_first)
> #define QTAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
> +#define QTAILQ_IN_USE(elm, field) ((elm)->field.tqe_prev != NULL)
>
> #define QTAILQ_LAST(head, headname) \
> (*(((struct headname *)((head)->tqh_last))->tqh_last))
> diff --git a/blockdev.c b/blockdev.c
> index eafeba9..0b73158 100644
> --- a/blockdev.c
> +++ b/blockdev.c
> @@ -4031,7 +4031,7 @@ void qmp_x_blockdev_del(bool has_id, const char *id,
> goto out;
> }
>
> - if (!blk && !bs->monitor_list.tqe_prev) {
> + if (!blk && !QTAILQ_IN_USE(bs, monitor_list)) {
> error_setg(errp, "Node %s is not owned by the monitor",
> bs->node_name);
> goto out;
> diff --git a/exec.c b/exec.c
> index 50e3ee2..8e8416b 100644
> --- a/exec.c
> +++ b/exec.c
> @@ -614,14 +614,13 @@ void cpu_exec_exit(CPUState *cpu)
> CPUClass *cc = CPU_GET_CLASS(cpu);
>
> cpu_list_lock();
> - if (cpu->node.tqe_prev == NULL) {
> + if (!QTAILQ_IN_USE(cpu, node)) {
> /* there is nothing to undo since cpu_exec_init() hasn't been called */
> cpu_list_unlock();
> return;
> }
>
> QTAILQ_REMOVE(&cpus, cpu, node);
> - cpu->node.tqe_prev = NULL;
> cpu->cpu_index = UNASSIGNED_CPU_INDEX;
> cpu_list_unlock();
>
> diff --git a/net/filter.c b/net/filter.c
> index 888fe6d..1dfd2ca 100644
> --- a/net/filter.c
> +++ b/net/filter.c
> @@ -239,7 +239,7 @@ static void netfilter_finalize(Object *obj)
> }
>
> if (nf->netdev && !QTAILQ_EMPTY(&nf->netdev->filters) &&
> - nf->next.tqe_prev) {
> + QTAILQ_IN_USE(nf, next)) {
> QTAILQ_REMOVE(&nf->netdev->filters, nf, next);
> }
> g_free(nf->netdev_id);
>
Looks good, thanks!
Paolo
^ permalink raw reply [flat|nested] 2+ messages in thread
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2016-08-01 10:05 ` Paolo Bonzini
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