Messages in this thread Patch in this message | | | From | Nadav Amit <> | Subject | [PATCH 09/19] vmw_balloon: simplify vmballoon_send_get_target() | Date | Mon, 17 Sep 2018 23:38:43 -0700 |
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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> --- drivers/misc/vmw_balloon.c | 35 ++++++++++++++--------------------- 1 file changed, 14 insertions(+), 21 deletions(-)
diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c index aafd087809e9..17ac066a20fe 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) @@ -960,7 +953,7 @@ 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) { -- 2.17.1
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