[PATCH] x86/ACPI: constify acpi_enter_sleep argument

[Frediano Ziglio <frediano.ziglio@xxxxxxxxx>]

Minor style change, structure is not changed.
No functional change.

Signed-off-by: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
---
 xen/arch/x86/acpi/power.c       | 2 +-
 xen/arch/x86/include/asm/acpi.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/acpi/power.c b/xen/arch/x86/acpi/power.c
index 81233738b1..861d12aab0 100644
--- a/xen/arch/x86/acpi/power.c
+++ b/xen/arch/x86/acpi/power.c
@@ -342,7 +342,7 @@ static long cf_check enter_state_helper(void *data)
  * Dom0 issues this hypercall in place of writing pm1a_cnt. Xen then
  * takes over the control and put the system into sleep state really.
  */
-int acpi_enter_sleep(struct xenpf_enter_acpi_sleep *sleep)
+int acpi_enter_sleep(const struct xenpf_enter_acpi_sleep *sleep)
 {
     if ( sleep->sleep_state == ACPI_STATE_S3 &&
          (!acpi_sinfo.wakeup_vector || !acpi_sinfo.vector_width ||
diff --git a/xen/arch/x86/include/asm/acpi.h b/xen/arch/x86/include/asm/acpi.h
index 6ce79ce465..68cee10f9a 100644
--- a/xen/arch/x86/include/asm/acpi.h
+++ b/xen/arch/x86/include/asm/acpi.h
@@ -106,7 +106,7 @@ extern s8 acpi_numa;
 extern struct acpi_sleep_info acpi_sinfo;
 #define acpi_video_flags bootsym(video_flags)
 struct xenpf_enter_acpi_sleep;
-extern int acpi_enter_sleep(struct xenpf_enter_acpi_sleep *sleep);
+extern int acpi_enter_sleep(const struct xenpf_enter_acpi_sleep *sleep);
 extern int acpi_enter_state(u32 state);
 
 struct acpi_sleep_info {
-- 
2.34.1