6.6-stable review patch. If anyone has any objections, please let me know.
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From: Ilpo Järvinen ilpo.jarvinen@linux.intel.com
[ Upstream commit 24be05591fb7a2a3edd639092c045298dd57aeea ]
There are unnecessary nested calls in fill_buf.c: - run_fill_buf() calls fill_cache() - alloc_buffer() calls malloc_and_init_memory()
Simplify the code flow and remove those unnecessary call levels by moving the called code inside the calling function and remove the duplicated error print.
Resolve the difference in run_fill_buf() and fill_cache() parameter name into 'buf_size' which is more descriptive than 'span'. Also, while moving the allocation related code, rename 'p' into 'buf' to be consistent in naming the variables.
Signed-off-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Reviewed-by: Reinette Chatre reinette.chatre@intel.com Signed-off-by: Shuah Khan skhan@linuxfoundation.org Stable-dep-of: caf02626b2bf ("selftests/resctrl: Fix memory overflow due to unhandled wraparound") Signed-off-by: Sasha Levin sashal@kernel.org --- tools/testing/selftests/resctrl/fill_buf.c | 59 +++++++--------------- tools/testing/selftests/resctrl/resctrl.h | 2 +- 2 files changed, 18 insertions(+), 43 deletions(-)
diff --git a/tools/testing/selftests/resctrl/fill_buf.c b/tools/testing/selftests/resctrl/fill_buf.c index 6d1d5eed595cd..635f938b11f09 100644 --- a/tools/testing/selftests/resctrl/fill_buf.c +++ b/tools/testing/selftests/resctrl/fill_buf.c @@ -51,29 +51,6 @@ static void mem_flush(unsigned char *buf, size_t buf_size) sb(); }
-static void *malloc_and_init_memory(size_t buf_size) -{ - void *p = NULL; - uint64_t *p64; - size_t s64; - int ret; - - ret = posix_memalign(&p, PAGE_SIZE, buf_size); - if (ret < 0) - return NULL; - - p64 = (uint64_t *)p; - s64 = buf_size / sizeof(uint64_t); - - while (s64 > 0) { - *p64 = (uint64_t)rand(); - p64 += (CL_SIZE / sizeof(uint64_t)); - s64 -= (CL_SIZE / sizeof(uint64_t)); - } - - return p; -} - static int fill_one_span_read(unsigned char *buf, size_t buf_size) { unsigned char *end_ptr = buf + buf_size; @@ -137,12 +114,25 @@ static int fill_cache_write(unsigned char *buf, size_t buf_size, bool once)
static unsigned char *alloc_buffer(size_t buf_size, int memflush) { - unsigned char *buf; + void *buf = NULL; + uint64_t *p64; + size_t s64; + int ret;
- buf = malloc_and_init_memory(buf_size); - if (!buf) + ret = posix_memalign(&buf, PAGE_SIZE, buf_size); + if (ret < 0) return NULL;
+ /* Initialize the buffer */ + p64 = buf; + s64 = buf_size / sizeof(uint64_t); + + while (s64 > 0) { + *p64 = (uint64_t)rand(); + p64 += (CL_SIZE / sizeof(uint64_t)); + s64 -= (CL_SIZE / sizeof(uint64_t)); + } + /* Flush the memory before using to avoid "cache hot pages" effect */ if (memflush) mem_flush(buf, buf_size); @@ -150,7 +140,7 @@ static unsigned char *alloc_buffer(size_t buf_size, int memflush) return buf; }
-static int fill_cache(size_t buf_size, int memflush, int op, bool once) +int run_fill_buf(size_t buf_size, int memflush, int op, bool once) { unsigned char *buf; int ret; @@ -164,21 +154,6 @@ static int fill_cache(size_t buf_size, int memflush, int op, bool once) else ret = fill_cache_write(buf, buf_size, once); free(buf); - - if (ret) { - printf("\n Error in fill cache read/write...\n"); - return -1; - } - - return ret; -} - -int run_fill_buf(size_t span, int memflush, int op, bool once) -{ - size_t cache_size = span; - int ret; - - ret = fill_cache(cache_size, memflush, op, once); if (ret) { printf("\n Error in fill cache\n"); return -1; diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h index dd3546655657a..a848e9c755787 100644 --- a/tools/testing/selftests/resctrl/resctrl.h +++ b/tools/testing/selftests/resctrl/resctrl.h @@ -91,7 +91,7 @@ int write_bm_pid_to_resctrl(pid_t bm_pid, char *ctrlgrp, char *mongrp, char *resctrl_val); int perf_event_open(struct perf_event_attr *hw_event, pid_t pid, int cpu, int group_fd, unsigned long flags); -int run_fill_buf(size_t span, int memflush, int op, bool once); +int run_fill_buf(size_t buf_size, int memflush, int op, bool once); int resctrl_val(const char * const *benchmark_cmd, struct resctrl_val_param *param); int mbm_bw_change(int cpu_no, const char * const *benchmark_cmd); void tests_cleanup(void);