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[Qemu-devel] [PATCH v2] migration: Don't use *_to_cpup() and cpu_to_*w()
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [PATCH v2] migration: Don't use *_to_cpup() and cpu_to_*w() |
Date: |
Fri, 10 Jun 2016 17:09:22 +0100 |
The *_to_cpup() and cpu_to_*w() functions just compose a pointer
dereference with a byteswap. Instead use ld*_p() and st*_p(),
which handle potential pointer misalignment and avoid the need
to cast the pointer.
Signed-off-by: Peter Maydell <address@hidden>
---
Changes v1->v2: fix cpu_to_*w() uses too.
The motivation here is that I'd like to get rid of _to_cpup()
and cpu_to_*w() entirely: we don't have many places that use them.
---
migration/migration.c | 12 ++++++------
migration/savevm.c | 4 ++--
2 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/migration/migration.c b/migration/migration.c
index 7ecbade..551da0a 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1381,7 +1381,7 @@ static void *source_return_path_thread(void *opaque)
/* OK, we have the message and the data */
switch (header_type) {
case MIG_RP_MSG_SHUT:
- sibling_error = be32_to_cpup((uint32_t *)buf);
+ sibling_error = ldl_be_p(buf);
trace_source_return_path_thread_shut(sibling_error);
if (sibling_error) {
error_report("RP: Sibling indicated error %d", sibling_error);
@@ -1395,13 +1395,13 @@ static void *source_return_path_thread(void *opaque)
goto out;
case MIG_RP_MSG_PONG:
- tmp32 = be32_to_cpup((uint32_t *)buf);
+ tmp32 = ldl_be_p(buf);
trace_source_return_path_thread_pong(tmp32);
break;
case MIG_RP_MSG_REQ_PAGES:
- start = be64_to_cpup((uint64_t *)buf);
- len = be32_to_cpup((uint32_t *)(buf + 8));
+ start = ldq_be_p(buf);
+ len = ldl_be_p(buf + 8);
migrate_handle_rp_req_pages(ms, NULL, start, len);
break;
@@ -1409,8 +1409,8 @@ static void *source_return_path_thread(void *opaque)
expected_len = 12 + 1; /* header + termination */
if (header_len >= expected_len) {
- start = be64_to_cpup((uint64_t *)buf);
- len = be32_to_cpup((uint32_t *)(buf + 8));
+ start = ldq_be_p(buf);
+ len = ldl_be_p(buf + 8);
/* Now we expect an idstr */
tmp32 = buf[12]; /* Length of the following idstr */
buf[13 + tmp32] = '\0';
diff --git a/migration/savevm.c b/migration/savevm.c
index 6c21231..7da46a6 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -822,9 +822,9 @@ void qemu_savevm_send_postcopy_ram_discard(QEMUFile *f,
const char *name,
buf[tmplen++] = '\0';
for (t = 0; t < len; t++) {
- cpu_to_be64w((uint64_t *)(buf + tmplen), start_list[t]);
+ stq_be_p(buf + tmplen, start_list[t]);
tmplen += 8;
- cpu_to_be64w((uint64_t *)(buf + tmplen), length_list[t]);
+ stq_be_p(buf + tmplen, length_list[t]);
tmplen += 8;
}
qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_RAM_DISCARD, tmplen, buf);
--
1.9.1
- [Qemu-devel] [PATCH v2] migration: Don't use *_to_cpup() and cpu_to_*w(),
Peter Maydell <=