[tip: x86/cache] x86/resctrl: Group struct rdt_hw_domain cleanup

tip-bot2 for James Morse
2022-09-23T18:03:41Z

The following commit has been merged into the x86/cache branch of tip:

Commit-ID: 7add3af4178d9e25afc8d990a7d1000ccb22b6a0
Gitweb: https://git.kernel.org/tip/7add3af4178d9e25afc8d990a7d1000ccb22b6a0
Author: James Morse <james.morse@arm.com>
AuthorDate: Fri, 02 Sep 2022 15:48:12
Committer: Borislav Petkov <bp@suse.de>
CommitterDate: Thu, 22 Sep 2022 15:27:15 +02:00

x86/resctrl: Group struct rdt_hw_domain cleanup

domain_add_cpu() and domain_remove_cpu() need to kfree() the child
arrays that were allocated by domain_setup_ctrlval().

As this memory is moved around, and new arrays are created, adjusting
the error handling cleanup code becomes noisier.

To simplify this, move all the kfree() calls into a domain_free() helper.
This depends on struct rdt_hw_domain being kzalloc()d, allowing it to
unconditionally kfree() all the child arrays.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Jamie Iles <quic_jiles@quicinc.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@fujitsu.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Xin Hao <xhao@linux.alibaba.com>
Tested-by: Shaopeng Tan <tan.shaopeng@fujitsu.com>
Tested-by: Cristian Marussi <cristian.marussi@arm.com>
Link: https://lore.kernel.org/r/20220902154829.30399-5-james.morse@arm.com
---
arch/x86/kernel/cpu/resctrl/core.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 25f3014..e37889f 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -414,6 +414,13 @@ void setup_default_ctrlval(struct rdt_resource *r, u32 *dc, u32 *dm)
}
}

+static void domain_free(struct rdt_hw_domain *hw_dom)
+{
+ kfree(hw_dom->ctrl_val);
+ kfree(hw_dom->mbps_val);
+ kfree(hw_dom);
+}
+
static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d)
{
struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
@@ -488,7 +495,7 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
rdt_domain_reconfigure_cdp(r);

if (r->alloc_capable && domain_setup_ctrlval(r, d)) {
- kfree(hw_dom);
+ domain_free(hw_dom);
return;
}

@@ -497,9 +504,7 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
err = resctrl_online_domain(r, d);
if (err) {
list_del(&d->list);
- kfree(hw_dom->ctrl_val);
- kfree(hw_dom->mbps_val);
- kfree(hw_dom);
+ domain_free(hw_dom);
}
}

@@ -547,12 +552,10 @@ static void domain_remove_cpu(int cpu, struct rdt_resource *r)
if (d->plr)
d->plr->d = NULL;

- kfree(hw_dom->ctrl_val);
- kfree(hw_dom->mbps_val);
bitmap_free(d->rmid_busy_llc);
kfree(d->mbm_total);
kfree(d->mbm_local);
- kfree(hw_dom);
+ domain_free(hw_dom);
return;
}