From: Fenghua Yu <fenghua.yu@intel.com>
To: "Shuah Khan" <shuah@kernel.org>,
"Reinette Chatre" <reinette.chatre@intel.com>,
"Tony Luck" <tony.luck@intel.com>,
"Babu Moger" <babu.moger@amd.com>,
"James Morse" <james.morse@arm.com>,
"Borislav Petkov" <bp@alien8.de>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ravi V Shankar" <ravi.v.shankar@intel.com>
Cc: "linux-kselftest" <linux-kselftest@vger.kernel.org>,
"linux-kernel" <linux-kernel@vger.kernel.org>,
Fenghua Yu <fenghua.yu@intel.com>
Subject: [PATCH v3 21/21] selftests/resctrl: Don't use global variable for capacity bitmask (CBM)
Date: Tue, 20 Oct 2020 23:51:26 +0000 [thread overview]
Message-ID: <20201020235126.1871815-22-fenghua.yu@intel.com> (raw)
In-Reply-To: <20201020235126.1871815-1-fenghua.yu@intel.com>
Reinette reported following compilation issue on Fedora 32, gcc version
10.1.1
/usr/bin/ld: cmt_test.o:<src_dir>/cmt_test.c:19: multiple definition of
`cbm_mask'; cat_test.o:<src_dir>/cat_test.c:20: first defined here
/usr/bin/ld: resctrlfs.o:<src_dir>/resctrlfs.c:52: multiple definition of
`cbm_mask'; cat_test.o:<src_dir>/cat_test.c:20: first defined here
Compiler throws an error because cbm_mask is defined as a global
variable in three different .c files, namely resctrlfs.c, cat_test.c and
cmt_test.c.
cbm_mask is a global variable that is supposed to hold the capacity
bitmask (CBM) value read from resctrl/info directory. This is done by
get_cbm_mask() function which then sets the global variable.
To reduce the use of global variables (thereby improving readability and
maintainability) change get_cbm_mask() implementation such that it now
accepts a reference to a string. Upon success, get_cbm_mask() populates the
string with CBM value read from resctrl/info directory and returns 0 and on
failure, returns -1.
Please note that this change to get_cbm_mask() fixes the issue reported by
Reinette because cbm_mask isn't a global variable anymore.
Fixes: 78941183d1b15 ("selftests/resctrl: Add Cache QoS Monitoring (CQM) selftest")
Fixes: 790bf585b0eee ("selftests/resctrl: Add Cache Allocation Technology (CAT) selftest")
Reported-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
---
tools/testing/selftests/resctrl/cat_test.c | 5 ++---
tools/testing/selftests/resctrl/cmt_test.c | 5 ++---
tools/testing/selftests/resctrl/resctrl.h | 2 +-
tools/testing/selftests/resctrl/resctrlfs.c | 10 +++++-----
4 files changed, 10 insertions(+), 12 deletions(-)
diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
index e518f8f7b4d8..60b31b85b484 100644
--- a/tools/testing/selftests/resctrl/cat_test.c
+++ b/tools/testing/selftests/resctrl/cat_test.c
@@ -17,8 +17,6 @@
#define MAX_DIFF_PERCENT 4
#define MAX_DIFF 1000000
-char cbm_mask[256];
-
/*
* Change schemata. Write schemata to specified
* con_mon grp, mon_grp in resctrl FS.
@@ -120,6 +118,7 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
{
unsigned long l_mask, l_mask_1, long_mask, cache_size;
int ret, pipefd[2], sibling_cpu_no, count_of_bits;
+ char cbm_mask[256];
char pipe_message;
pid_t bm_pid;
@@ -130,7 +129,7 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
return ret;
/* Get default cbm mask for L3/L2 cache */
- ret = get_cbm_mask(cache_type);
+ ret = get_cbm_mask(cache_type, cbm_mask);
if (ret)
return ret;
diff --git a/tools/testing/selftests/resctrl/cmt_test.c b/tools/testing/selftests/resctrl/cmt_test.c
index f0cb441cca9f..0bee3e6480a3 100644
--- a/tools/testing/selftests/resctrl/cmt_test.c
+++ b/tools/testing/selftests/resctrl/cmt_test.c
@@ -16,8 +16,6 @@
#define MAX_DIFF 2000000
#define MAX_DIFF_PERCENT 15
-char cbm_mask[256];
-
static int cmt_setup(int num, ...)
{
struct resctrl_val_param *p;
@@ -112,6 +110,7 @@ int cmt_resctrl_val(int cpu_no, int n, char **benchmark_cmd)
{
int ret, mum_resctrlfs, count_of_bits;
unsigned long long_mask, cache_size;
+ char cbm_mask[256];
cache_size = 0;
mum_resctrlfs = 1;
@@ -120,7 +119,7 @@ int cmt_resctrl_val(int cpu_no, int n, char **benchmark_cmd)
if (ret)
return ret;
- ret = get_cbm_mask("L3");
+ ret = get_cbm_mask("L3", cbm_mask);
if (ret)
return ret;
diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
index 65ca24bf3eac..2546435864d0 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -96,7 +96,7 @@ void tests_cleanup(void);
void mbm_test_cleanup(void);
int mba_schemata_change(int cpu_no, char *bw_report, char **benchmark_cmd);
void mba_test_cleanup(void);
-int get_cbm_mask(char *cache_type);
+int get_cbm_mask(char *cache_type, char *cbm_mask);
int get_cache_size(int cpu_no, char *cache_type, unsigned long *cache_size);
void ctrlc_handler(int signum, siginfo_t *info, void *ptr);
int cat_val(struct resctrl_val_param *param);
diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
index 21281fd895b7..a07118e01590 100644
--- a/tools/testing/selftests/resctrl/resctrlfs.c
+++ b/tools/testing/selftests/resctrl/resctrlfs.c
@@ -49,8 +49,6 @@ static int find_resctrl_mount(char *buffer)
return -ENOENT;
}
-char cbm_mask[256];
-
/*
* remount_resctrlfs - Remount resctrl FS at /sys/fs/resctrl
* @mum_resctrlfs: Should the resctrl FS be remounted?
@@ -208,16 +206,18 @@ int get_cache_size(int cpu_no, char *cache_type, unsigned long *cache_size)
/*
* get_cbm_mask - Get cbm mask for given cache
* @cache_type: Cache level L2/L3
- *
- * Mask is stored in cbm_mask which is global variable.
+ * @cbm_mask: cbm_mask returned as a string
*
* Return: = 0 on success, < 0 on failure.
*/
-int get_cbm_mask(char *cache_type)
+int get_cbm_mask(char *cache_type, char *cbm_mask)
{
char cbm_mask_path[1024];
FILE *fp;
+ if (!cbm_mask)
+ return -1;
+
sprintf(cbm_mask_path, "%s/%s/cbm_mask", CBM_MASK_PATH, cache_type);
fp = fopen(cbm_mask_path, "r");
--
2.29.0
next prev parent reply other threads:[~2020-10-20 23:51 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-20 23:51 [PATCH v3 00/21] Miscellaneous fixes for resctrl selftests Fenghua Yu
2020-10-20 23:51 ` [PATCH v3 01/21] selftests/resctrl: Rename CQM test as CMT test Fenghua Yu
2020-10-27 20:55 ` Shuah Khan
2020-10-20 23:51 ` [PATCH v3 02/21] selftests/resctrl: Fix typo Fenghua Yu
2020-10-27 20:56 ` Shuah Khan
2020-10-20 23:51 ` [PATCH v3 03/21] selftests/resctrl: Fix typo in help text Fenghua Yu
2020-10-27 20:58 ` Shuah Khan
2020-10-20 23:51 ` [PATCH v3 04/21] selftests/resctrl: Declare global variables as extern Fenghua Yu
2020-10-20 23:51 ` [PATCH v3 05/21] selftests/resctrl: Return if resctrl file system is not supported Fenghua Yu
2020-10-27 21:34 ` Shuah Khan
2020-10-20 23:51 ` [PATCH v3 06/21] selftests/resctrl: Check for resctrl mount point only if resctrl FS is supported Fenghua Yu
2020-10-20 23:51 ` [PATCH v3 07/21] selftests/resctrl: Use resctrl/info for feature detection Fenghua Yu
2020-10-20 23:51 ` [PATCH v3 08/21] selftests/resctrl: Ensure sibling CPU is not same as original CPU Fenghua Yu
2020-10-20 23:51 ` [PATCH v3 09/21] selftests/resctrl: Fix missing options "-n" and "-p" Fenghua Yu
2020-10-20 23:51 ` [PATCH v3 10/21] selftests/resctrl: Fix MBA/MBM results reporting format Fenghua Yu
2020-10-20 23:51 ` [PATCH v3 11/21] selftests/resctrl: Abort running tests if not root user Fenghua Yu
2020-10-20 23:51 ` [PATCH v3 12/21] selftests/resctrl: Enable gcc checks to detect buffer overflows Fenghua Yu
2020-10-20 23:51 ` [PATCH v3 13/21] selftests/resctrl: Don't hard code value of "no_of_bits" variable Fenghua Yu
2020-10-20 23:51 ` [PATCH v3 14/21] selftests/resctrl: Modularize resctrl test suite main() function Fenghua Yu
2020-10-20 23:51 ` [PATCH v3 15/21] selftests/resctrl: Skip the test if requested resctrl feature is not supported Fenghua Yu
2020-10-20 23:51 ` [PATCH v3 16/21] selftests/resctrl: Umount resctrl FS only if mounted Fenghua Yu
2020-10-20 23:51 ` [PATCH v3 17/21] selftests/resctrl: Unmount resctrl FS after running all tests Fenghua Yu
2020-10-20 23:51 ` [PATCH v3 18/21] selftests/resctrl: Fix incorrect parsing of iMC counters Fenghua Yu
2020-10-20 23:51 ` [PATCH v3 19/21] selftests/resctrl: Fix checking for < 0 for unsigned values Fenghua Yu
2020-10-20 23:51 ` [PATCH v3 20/21] selftests/resctrl: Fix unnecessary usage of global variables Fenghua Yu
2020-10-20 23:51 ` Fenghua Yu [this message]
2020-10-28 0:46 ` [PATCH v3 00/21] Miscellaneous fixes for resctrl selftests Shuah Khan
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