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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2013-12-31 15:55:39 -0500 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2014-01-06 10:44:16 -0500 |
| commit | 7f256020cc599bc0b736c57d702b864dbbefcefb (patch) | |
| tree | a6eb6a8f1d809cf98c058ff7272a6eddf51ca57f /drivers/xen/grant-table.c | |
| parent | 2771374d47220c7ec271281437625e9519505bb2 (diff) | |
| download | lwn-7f256020cc599bc0b736c57d702b864dbbefcefb.tar.gz lwn-7f256020cc599bc0b736c57d702b864dbbefcefb.zip | |
xen/grants: Remove gnttab_max_grant_frames dependency on gnttab_init.
The function gnttab_max_grant_frames() returns the maximum amount
of frames (pages) of grants we can have. Unfortunatly it was
dependent on gnttab_init() having been run before to initialize
the boot max value (boot_max_nr_grant_frames).
This meant that users of gnttab_max_grant_frames would always
get a zero value if they called before gnttab_init() - such as
'platform_pci_init' (drivers/xen/platform-pci.c).
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Diffstat (limited to 'drivers/xen/grant-table.c')
| -rw-r--r-- | drivers/xen/grant-table.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c index aa846a48f400..99399cb0fd1c 100644 --- a/drivers/xen/grant-table.c +++ b/drivers/xen/grant-table.c @@ -62,7 +62,6 @@ static grant_ref_t **gnttab_list; static unsigned int nr_grant_frames; -static unsigned int boot_max_nr_grant_frames; static int gnttab_free_count; static grant_ref_t gnttab_free_head; static DEFINE_SPINLOCK(gnttab_list_lock); @@ -827,6 +826,11 @@ static unsigned int __max_nr_grant_frames(void) unsigned int gnttab_max_grant_frames(void) { unsigned int xen_max = __max_nr_grant_frames(); + static unsigned int boot_max_nr_grant_frames; + + /* First time, initialize it properly. */ + if (!boot_max_nr_grant_frames) + boot_max_nr_grant_frames = __max_nr_grant_frames(); if (xen_max > boot_max_nr_grant_frames) return boot_max_nr_grant_frames; @@ -1227,13 +1231,12 @@ int gnttab_init(void) gnttab_request_version(); nr_grant_frames = 1; - boot_max_nr_grant_frames = __max_nr_grant_frames(); /* Determine the maximum number of frames required for the * grant reference free list on the current hypervisor. */ BUG_ON(grefs_per_grant_frame == 0); - max_nr_glist_frames = (boot_max_nr_grant_frames * + max_nr_glist_frames = (gnttab_max_grant_frames() * grefs_per_grant_frame / RPP); gnttab_list = kmalloc(max_nr_glist_frames * sizeof(grant_ref_t *), |