diff options
| author | Nadav Amit <namit@vmware.com> | 2018-09-20 10:30:16 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-25 20:11:42 +0200 |
| commit | 0395be3ece114cda496dafd1fb337288c8305e7b (patch) | |
| tree | a7042d863635af49f25d04adadd180311358692e /drivers/misc | |
| parent | 8b079cd00f70cf8ad2df00fb36674683d637fae0 (diff) | |
| download | linux-0395be3ece114cda496dafd1fb337288c8305e7b.tar.bz2 | |
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')
| -rw-r--r-- | drivers/misc/vmw_balloon.c | 35 |
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) { |