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authorNadav Amit <namit@vmware.com>2018-09-20 10:30:16 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-25 20:11:42 +0200
commit0395be3ece114cda496dafd1fb337288c8305e7b (patch)
treea7042d863635af49f25d04adadd180311358692e /drivers/misc/vmw_balloon.c
parent8b079cd00f70cf8ad2df00fb36674683d637fae0 (diff)
vmw_balloon: simplify vmballoon_send_get_target()
As we want to leave as little as possible on the global balloon structure, to avoid possible future races, we want to get rid sysinfo. We can actually get the total_ram directly, and simplify the logic of vmballoon_send_get_target() a little. While we are doing that, let's return int and avoid mistakes due to bool/int conversions. Reviewed-by: Xavier Deguillard <xdeguillard@vmware.com> Signed-off-by: Nadav Amit <namit@vmware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/vmw_balloon.c')
-rw-r--r--drivers/misc/vmw_balloon.c35
1 files changed, 14 insertions, 21 deletions
diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c
index 0d9f223d463e..3c80a21e0f91 100644
--- a/drivers/misc/vmw_balloon.c
+++ b/drivers/misc/vmw_balloon.c
@@ -223,8 +223,6 @@ struct vmballoon {
struct dentry *dbg_entry;
#endif
- struct sysinfo sysinfo;
-
struct delayed_work dwork;
struct vmci_handle vmci_doorbell;
@@ -353,34 +351,29 @@ static u16 vmballoon_page_size(bool is_2m_page)
return 1;
}
-/*
- * Retrieve desired balloon size from the host.
+/**
+ * vmballoon_send_get_target() - Retrieve desired balloon size from the host.
+ *
+ * @b: pointer to the balloon.
+ *
+ * Return: zero on success, EINVAL if limit does not fit in 32-bit, as required
+ * by the host-guest protocol and EIO if an error occurred in communicating with
+ * the host.
*/
-static bool vmballoon_send_get_target(struct vmballoon *b)
+static int vmballoon_send_get_target(struct vmballoon *b)
{
unsigned long status;
unsigned long limit;
- u32 limit32;
- /*
- * si_meminfo() is cheap. Moreover, we want to provide dynamic
- * max balloon size later. So let us call si_meminfo() every
- * iteration.
- */
- si_meminfo(&b->sysinfo);
- limit = b->sysinfo.totalram;
+ limit = totalram_pages;
/* Ensure limit fits in 32-bits */
- limit32 = (u32)limit;
- if (limit != limit32)
- return false;
+ if (limit != (u32)limit)
+ return -EINVAL;
status = vmballoon_cmd(b, VMW_BALLOON_CMD_GET_TARGET, limit, 0);
- if (status == VMW_BALLOON_SUCCESS)
- return true;
-
- return false;
+ return status == VMW_BALLOON_SUCCESS ? 0 : -EIO;
}
static struct page *vmballoon_alloc_page(bool is_2m_page)
@@ -962,7 +955,7 @@ static void vmballoon_work(struct work_struct *work)
if (b->reset_required)
vmballoon_reset(b);
- if (vmballoon_send_get_target(b))
+ if (!vmballoon_send_get_target(b))
change = vmballoon_change(b);
if (change != 0) {