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| author | Dexuan Cui <decui@microsoft.com> | 2018-09-23 21:10:44 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-13 11:08:34 -0800 |
| commit | 56628c1936aea563d3e4e2eaddb2efb4a0acdc87 (patch) | |
| tree | e57c94830b595b3a385336d10826573442cd0420 /drivers/hv | |
| parent | a28549b8c14c868827dd32d856738685261d0e31 (diff) | |
| download | linux-stable-56628c1936aea563d3e4e2eaddb2efb4a0acdc87.tar.gz linux-stable-56628c1936aea563d3e4e2eaddb2efb4a0acdc87.tar.bz2 linux-stable-56628c1936aea563d3e4e2eaddb2efb4a0acdc87.zip | |
Drivers: hv: vmbus: Use cpumask_var_t for on-stack cpu mask
[ Upstream commit 25355252607ca288f329ee033f387764883393f6 ]
A cpumask structure on the stack can cause a warning with
CONFIG_NR_CPUS=8192 (e.g. Ubuntu 16.04 and 18.04 use this):
drivers/hv//channel_mgmt.c: In function ‘init_vp_index’:
drivers/hv//channel_mgmt.c:702:1: warning: the frame size of 1032 bytes
is larger than 1024 bytes [-Wframe-larger-than=]
Nowadays it looks most distros enable CONFIG_CPUMASK_OFFSTACK=y, and
hence we can work around the warning by using cpumask_var_t.
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv')
| -rw-r--r-- | drivers/hv/channel_mgmt.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c index 0f0e091c117c..c4a1ebcfffb6 100644 --- a/drivers/hv/channel_mgmt.c +++ b/drivers/hv/channel_mgmt.c @@ -606,16 +606,18 @@ static void init_vp_index(struct vmbus_channel *channel, u16 dev_type) bool perf_chn = vmbus_devs[dev_type].perf_device; struct vmbus_channel *primary = channel->primary_channel; int next_node; - struct cpumask available_mask; + cpumask_var_t available_mask; struct cpumask *alloced_mask; if ((vmbus_proto_version == VERSION_WS2008) || - (vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) { + (vmbus_proto_version == VERSION_WIN7) || (!perf_chn) || + !alloc_cpumask_var(&available_mask, GFP_KERNEL)) { /* * Prior to win8, all channel interrupts are * delivered on cpu 0. * Also if the channel is not a performance critical * channel, bind it to cpu 0. + * In case alloc_cpumask_var() fails, bind it to cpu 0. */ channel->numa_node = 0; channel->target_cpu = 0; @@ -653,7 +655,7 @@ static void init_vp_index(struct vmbus_channel *channel, u16 dev_type) cpumask_clear(alloced_mask); } - cpumask_xor(&available_mask, alloced_mask, + cpumask_xor(available_mask, alloced_mask, cpumask_of_node(primary->numa_node)); cur_cpu = -1; @@ -671,10 +673,10 @@ static void init_vp_index(struct vmbus_channel *channel, u16 dev_type) } while (true) { - cur_cpu = cpumask_next(cur_cpu, &available_mask); + cur_cpu = cpumask_next(cur_cpu, available_mask); if (cur_cpu >= nr_cpu_ids) { cur_cpu = -1; - cpumask_copy(&available_mask, + cpumask_copy(available_mask, cpumask_of_node(primary->numa_node)); continue; } @@ -704,6 +706,8 @@ static void init_vp_index(struct vmbus_channel *channel, u16 dev_type) channel->target_cpu = cur_cpu; channel->target_vp = hv_cpu_number_to_vp_number(cur_cpu); + + free_cpumask_var(available_mask); } static void vmbus_wait_for_unload(void) |