On Wed, Jan 24, 2024 at 10:51:49AM -0800, Reinette Chatre wrote:
> Thank you very much. For what it is worth, I do agree with the actual fix
> and you can add:
> Acked-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>
Ok, have a look at the below, pls, and lemme know if that's ok too.
mbm_config_write_domain() only returns 0 so it can be void. So the
callsite doesn't need to check retval either.
Thx.
---
From: Babu Moger <babu.moger@xxxxxxx>
Date: Wed, 24 Jan 2024 11:52:56 -0600
Subject: [PATCH] x86/resctrl: Remove redundant variable in
mbm_config_write_domain()
The kernel test robot reported the following warning after
54e35eb8611c ("x86/resctrl: Read supported bandwidth sources from CPUID").
even though the issue is present even in the original patch which added
this function
92bd5a139033 ("x86/resctrl: Add interface to write mbm_total_bytes_config")
$ make C=1 CHECK=scripts/coccicheck arch/x86/kernel/cpu/resctrl/rdtgroup.o
...
arch/x86/kernel/cpu/resctrl/rdtgroup.c:1621:5-8: Unneeded variable: "ret". Return "0" on line 1655
Remove the local variable 'ret'.
[ bp: Massage commit message, make mbm_config_write_domain() void. ]
Fixes: 92bd5a139033 ("x86/resctrl: Add interface to write mbm_total_bytes_config")
Closes: https://lore.kernel.org/oe-kbuild-all/202401241810.jbd8Ipa1-lkp@xxxxxxxxx/
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Acked-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>
Link: https://lore.kernel.org/r/202401241810.jbd8Ipa1-lkp@xxxxxxxxx
---
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 13 +++----------
1 file changed, 3 insertions(+), 10 deletions(-)
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 2b69e560b05f..c33eb77b6d70 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1614,11 +1614,10 @@ static void mon_event_config_write(void *info)
wrmsr(MSR_IA32_EVT_CFG_BASE + index, mon_info->mon_config, 0);
}
-static int mbm_config_write_domain(struct rdt_resource *r,
+static void mbm_config_write_domain(struct rdt_resource *r,
struct rdt_domain *d, u32 evtid, u32 val)
{
struct mon_config_info mon_info = {0};
- int ret = 0;
/*
* Read the current config value first. If both are the same then
@@ -1627,7 +1626,7 @@ static int mbm_config_write_domain(struct rdt_resource *r,
mon_info.evtid = evtid;
mondata_config_read(d, &mon_info);
if (mon_info.mon_config == val)
- goto out;
+ return;
mon_info.mon_config = val;
@@ -1650,9 +1649,6 @@ static int mbm_config_write_domain(struct rdt_resource *r,
* mbm_local and mbm_total counts for all the RMIDs.
*/
resctrl_arch_reset_rmid_all(r, d);
-
-out:
- return ret;
}
static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
@@ -1661,7 +1657,6 @@ static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
char *dom_str = NULL, *id_str;
unsigned long dom_id, val;
struct rdt_domain *d;
- int ret = 0;
next:
if (!tok || tok[0] == '\0')
@@ -1690,9 +1685,7 @@ static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
list_for_each_entry(d, &r->domains, list) {
if (d->id == dom_id) {
- ret = mbm_config_write_domain(r, d, evtid, val);
- if (ret)
- return -EINVAL;
+ mbm_config_write_domain(r, d, evtid, val);
goto next;
}
}
--
2.43.0
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
