From 0395be3ece114cda496dafd1fb337288c8305e7b Mon Sep 17 00:00:00 2001 From: Nadav Amit Date: Thu, 20 Sep 2018 10:30:16 -0700 Subject: 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 Signed-off-by: Nadav Amit Signed-off-by: Greg Kroah-Hartman --- drivers/misc/vmw_balloon.c | 35 ++++++++++++++--------------------- 1 file changed, 14 insertions(+), 21 deletions(-) (limited to 'drivers/misc') 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) { -- cgit v1.2.3-59-g8ed1b