Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-11 05:33:09 +00:00
Code Issues Packages Projects Releases Wiki Activity

x86/resctrl: Remove unnecessary check for cbm_validate()

Browse Source 
The Smatch static checker reports the following error after commit:

  a36c5ff560 ("x86/resctrl: Bring cbm_validate() into the resource structure"):

  arch/x86/kernel/cpu/resctrl/ctrlmondata.c:227 parse_cbm()
  error: uninitialized symbol 'cbm_val'.
  arch/x86/kernel/cpu/resctrl/ctrlmondata.c:236 parse_cbm()
  error: uninitialized symbol 'cbm_val'.

This could happen if ->cbm_validate() is NULL which could leave cbm_val
uninitialized.

However, there is no case where ->cbm_validate() can be NULL as it is
initialized based on a vendor check. So it is either an Intel or an AMD
version it points to. And in both the cases it is initialized properly.
Thus, remove the first check.

Verified the fix running Smatch.

 [ bp: massage commit message. ]

Fixes: a36c5ff560 ("x86/resctrl: Bring cbm_validate() into the resource structure")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20181128224234.22998-1-babu.moger@amd.com
This commit is contained in:
Babu Moger 2018-11-28 22:42:47 +00:00 committed by Borislav Petkov
parent 456824896d
commit cb74635faa
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/kernel/cpu/resctrl/ctrlmondata.c
View File

@ -219,7 +219,7 @@ int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
return -EINVAL;
}
if (r->cbm_validate && !r->cbm_validate(data->buf, &cbm_val, r))
if (!r->cbm_validate(data->buf, &cbm_val, r))
return -EINVAL;
if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||