[dpdk-dev] [PATCH v3 03/33] eal: define the public API for trace support

[<jerinj@marvell.com>]

From: Jerin Jacob <jerinj@marvell.com>

Define the public API for trace support.
This patch also adds support for the build infrastructure and
update the MAINTAINERS file for the trace subsystem.

Signed-off-by: Jerin Jacob <jerinj@marvell.com>
Signed-off-by: Sunil Kumar Kori <skori@marvell.com>
---
 MAINTAINERS                               |   6 +
 config/common_base                        |   1 +
 config/rte_config.h                       |   1 +
 doc/api/doxy-api-index.md                 |   3 +-
 lib/librte_eal/common/Makefile            |   1 +
 lib/librte_eal/common/eal_common_trace.c  |   6 +
 lib/librte_eal/common/include/rte_trace.h | 522 ++++++++++++++++++++++
 lib/librte_eal/common/meson.build         |   2 +
 lib/librte_eal/freebsd/eal/Makefile       |   1 +
 lib/librte_eal/linux/eal/Makefile         |   1 +
 10 files changed, 543 insertions(+), 1 deletion(-)
 create mode 100644 lib/librte_eal/common/eal_common_trace.c
 create mode 100644 lib/librte_eal/common/include/rte_trace.h

diff --git a/MAINTAINERS b/MAINTAINERS
index db235c2cc..7ce224330 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -196,6 +196,12 @@ F: app/test/test_string_fns.c
 F: app/test/test_tailq.c
 F: app/test/test_version.c
 
+Trace
+M: Jerin Jacob <jerinj@marvell.com>
+M: Sunil Kumar Kori <skori@marvell.com>
+F: lib/librte_eal/common/include/rte_trace*.h
+F: lib/librte_eal/common/eal_common_trace*.c
+
 Memory Allocation
 M: Anatoly Burakov <anatoly.burakov@intel.com>
 F: lib/librte_eal/common/include/rte_fbarray.h
diff --git a/config/common_base b/config/common_base
index c31175f9d..a3508d1f2 100644
--- a/config/common_base
+++ b/config/common_base
@@ -99,6 +99,7 @@ CONFIG_RTE_MAX_MEMZONE=2560
 CONFIG_RTE_MAX_TAILQ=32
 CONFIG_RTE_ENABLE_ASSERT=n
 CONFIG_RTE_LOG_DP_LEVEL=RTE_LOG_INFO
+CONFIG_RTE_ENABLE_TRACE_DP=n
 CONFIG_RTE_LOG_HISTORY=256
 CONFIG_RTE_BACKTRACE=y
 CONFIG_RTE_LIBEAL_USE_HPET=n
diff --git a/config/rte_config.h b/config/rte_config.h
index d30786bc0..6b250288c 100644
--- a/config/rte_config.h
+++ b/config/rte_config.h
@@ -42,6 +42,7 @@
 #define RTE_MAX_MEMZONE 2560
 #define RTE_MAX_TAILQ 32
 #define RTE_LOG_DP_LEVEL RTE_LOG_INFO
+#define RTE_ENABLE_TRACE_DP 0
 #define RTE_BACKTRACE 1
 #define RTE_MAX_VFIO_CONTAINERS 64
 
diff --git a/doc/api/doxy-api-index.md b/doc/api/doxy-api-index.md
index dff496be0..190f0ccc2 100644
--- a/doc/api/doxy-api-index.md
+++ b/doc/api/doxy-api-index.md
@@ -174,7 +174,8 @@ The public API headers are grouped by topics:
   [hexdump]            (@ref rte_hexdump.h),
   [debug]              (@ref rte_debug.h),
   [log]                (@ref rte_log.h),
-  [errno]              (@ref rte_errno.h)
+  [errno]              (@ref rte_errno.h),
+  [trace]              (@ref rte_trace.h)
 
 - **misc**:
   [EAL config]         (@ref rte_eal.h),
diff --git a/lib/librte_eal/common/Makefile b/lib/librte_eal/common/Makefile
index c2c6d92cd..9384d6f6e 100644
--- a/lib/librte_eal/common/Makefile
+++ b/lib/librte_eal/common/Makefile
@@ -9,6 +9,7 @@ INC += rte_debug.h rte_eal.h rte_eal_interrupts.h
 INC += rte_errno.h rte_launch.h rte_lcore.h
 INC += rte_log.h rte_memory.h rte_memzone.h
 INC += rte_per_lcore.h rte_random.h
+INC += rte_trace.h
 INC += rte_tailq.h rte_interrupts.h rte_alarm.h
 INC += rte_string_fns.h rte_version.h
 INC += rte_eal_memconfig.h
diff --git a/lib/librte_eal/common/eal_common_trace.c b/lib/librte_eal/common/eal_common_trace.c
new file mode 100644
index 000000000..e18ba1c95
--- /dev/null
+++ b/lib/librte_eal/common/eal_common_trace.c
@@ -0,0 +1,6 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(C) 2020 Marvell International Ltd.
+ */
+
+#include <rte_trace.h>
+
diff --git a/lib/librte_eal/common/include/rte_trace.h b/lib/librte_eal/common/include/rte_trace.h
new file mode 100644
index 000000000..459374d86
--- /dev/null
+++ b/lib/librte_eal/common/include/rte_trace.h
@@ -0,0 +1,522 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(C) 2020 Marvell International Ltd.
+ */
+
+#ifndef _RTE_TRACE_H_
+#define _RTE_TRACE_H_
+
+/**
+ * @file
+ *
+ * RTE Trace API
+ *
+ * This file provides the trace API to RTE applications.
+ *
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdbool.h>
+#include <stdio.h>
+
+#include <rte_common.h>
+#include <rte_compat.h>
+
+/** The trace object. The trace APIs are based on this opaque object. */
+typedef uint64_t rte_trace_t;
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Enumerate trace mode operation.
+ */
+enum rte_trace_mode {
+	/**
+	 * In this mode, When no space left in trace buffer, the subsequent
+	 * events overwrite the old events in the trace buffer.
+	 */
+	RTE_TRACE_MODE_OVERWRITE,
+	/**
+	 * In this mode, When no space left on trace buffer, the subsequent
+	 * events shall not be recorded in the trace buffer.
+	 */
+	RTE_TRACE_MODE_DISCARD,
+};
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Test if global trace is enabled.
+ *
+ * @return
+ *    true if global trace is enabled, false otherwise.
+ */
+__rte_experimental
+bool rte_trace_global_is_enabled(void);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Test if global trace is disabled.
+ *
+ * @return
+ *    true if global trace is disabled, false otherwise.
+ */
+__rte_experimental
+bool rte_trace_global_is_disabled(void);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Test if a given trace is invalid.
+ * @param trace
+ *    The trace object.
+ * @return
+ *    true if global trace is invalid, false otherwise.
+ */
+__rte_experimental
+bool rte_trace_is_id_invalid(rte_trace_t *trace);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Set the global trace level.
+ *
+ * After this call, trace with a level lower or equal than the level
+ * passed as argument will be captured in the trace buffer.
+ *
+ * @param level
+ *   Trace level. A value between RTE_LOG_EMERG (1) and RTE_LOG_DEBUG (8).
+ */
+__rte_experimental
+void rte_trace_global_level_set(uint32_t level);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Get the global trace level.
+ *
+ * @return
+ *   The current global trace level.
+ */
+__rte_experimental
+uint32_t rte_trace_global_level_get(void);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Set the global trace mode.
+ *
+ * After this call, All tracepoints will be switched to new mode.
+ *
+ * @param mode
+ *   Trace mode.
+ */
+__rte_experimental
+void rte_trace_global_mode_set(enum rte_trace_mode mode);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Get the global trace mode.
+ *
+ * @return
+ *   The current global trace mode.
+ */
+__rte_experimental
+enum rte_trace_mode rte_trace_global_mode_get(void);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Enable recording of the given tracepoint in the trace buffer.
+ *
+ * @param trace
+ *   The tracepoint object to enable.
+ * @return
+ *   - 0: Success.
+ *   - (-ERANGE): Trace object is not registered.
+ *   - (-EACCES): Trace object level is less than the global trace level.
+ */
+__rte_experimental
+int rte_trace_enable(rte_trace_t *trace);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Disable recording of the given tracepoint in the trace buffer.
+ *
+ * @param trace
+ *   The tracepoint object to disable.
+ * @return
+ *   - 0: Success.
+ *   - (-ERANGE): Trace object is not registered.
+ */
+__rte_experimental
+int rte_trace_disable(rte_trace_t *trace);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Test if given trace is enabled.
+ *
+ * @param trace
+ *    The trace object.
+ * @return
+ *    true if trace is enabled, false otherwise.
+ */
+__rte_experimental
+bool rte_trace_is_enabled(rte_trace_t *trace);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Test if given trace is disabled.
+ *
+ * @param trace
+ *    The trace object.
+ * @return
+ *    true if trace is disabled, false otherwise.
+ */
+__rte_experimental
+bool rte_trace_is_disabled(rte_trace_t *trace);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Set the trace level for the given tracepoint.
+ *
+ * After this call, if passed trace level lower or equal than the global trace
+ * level and this trace is enabled then trace will be captured in the
+ * trace buffer.
+ *
+ * @param trace
+ *    The trace object.
+ * @param level
+ *   Trace level. A value between RTE_LOG_EMERG (1) and RTE_LOG_DEBUG (8).
+ * @return
+ *   - 0: Success.
+ *   - (-EINVAL): Trace object is not registered or invalid trace level.
+ */
+__rte_experimental
+int rte_trace_level_set(rte_trace_t *trace, uint32_t level);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Get the trace level for the given tracepoint.
+ *
+ * @param trace
+ *    The trace object.
+ * @return
+ *   - A value between RTE_LOG_EMERG (1) and RTE_LOG_DEBUG (8).
+ *   - 0: Trace object is not registered.
+ */
+__rte_experimental
+uint32_t rte_trace_level_get(rte_trace_t *trace);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Set the trace mode for the given tracepoint.
+ *
+ * @param trace
+ *    The trace object.
+ * @param mode
+ *   Trace mode.
+ * @return
+ *   - 0: Success.
+ *   - (-EINVAL): Trace object is not registered or invalid trace level.
+ */
+__rte_experimental
+int rte_trace_mode_set(rte_trace_t *trace, enum rte_trace_mode mode);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Get the trace mode for the given tracepoint.
+ *
+ * @param trace
+ *    The trace object.
+ * @return
+ *   - Zero or positive: Mode encoded as enum rte_trace_mode.
+ *   - (-EINVAL): Trace object is not registered.
+ */
+__rte_experimental
+int rte_trace_mode_get(rte_trace_t *trace);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Enable/Disable a set of tracepoints based on shell pattern.
+ *
+ * @param pattern
+ *   The match pattern identifying the tracepoint.
+ * @param enable
+ *    true to enable tracepoint, false to disable the tracepoint, upon match.
+ * @return
+ *   - 0: Success and no pattern match.
+ *   - 1: Success and found pattern match.
+ *   - (-ERANGE): Trace object is not registered.
+ */
+__rte_experimental
+int rte_trace_pattern(const char *pattern, bool enable);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Enable/Disable a set of tracepoints based on regular expression.
+ *
+ * @param regex
+ *   A regular expression identifying the tracepoint.
+ * @param enable
+ *    true to enable tracepoint, false to disable the tracepoint, upon match.
+ * @return
+ *   - 0: Success.
+ *   - (-ERANGE): Trace object is not registered.
+ *   - (-EINVAL): Invalid regular expression rule.
+ */
+__rte_experimental
+int rte_trace_regexp(const char *regex, bool enable);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Save the trace buffer to the trace directory.
+ *
+ * By default, trace directory will be created at HOME directory and this can be
+ * overridden by --trace-dir EAL parameter.
+ *
+ * @return
+ *   - 0: Success.
+ *   - <0 : Failure.
+ */
+__rte_experimental
+int rte_trace_save(void);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Search a trace object from its name.
+ *
+ * @param name
+ *   The name of the tracepoint.
+ * @return
+ *   The tracepoint object or NULL if not found.
+ */
+__rte_experimental
+rte_trace_t *rte_trace_by_name(const char *name);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Dump the trace metadata to a file.
+ *
+ * @param f
+ *   A pointer to a file for output
+ * @return
+ *   - 0: Success.
+ *   - <0 : Failure.
+ */
+__rte_experimental
+int rte_trace_metadata_dump(FILE *f);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ * Dump the trace subsystem status to a file.
+ *
+ * @param f
+ *   A pointer to a file for output
+ */
+__rte_experimental
+void rte_trace_dump(FILE *f);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Test if the trace datapath compile-time option is enabled.
+ *
+ * @return
+ *   true if trace datapath enabled, false otherwise.
+ */
+static __rte_always_inline bool
+rte_trace_is_dp_enabled(void)
+{
+#ifdef RTE_ENABLE_TRACE_DP
+	return RTE_ENABLE_TRACE_DP;
+#else
+	return false;
+#endif
+}
+
+/** Macro to define the tracepoint. */
+#define RTE_TRACE_POINT_DEFINE(tp)\
+rte_trace_t __attribute__((section("__rte_trace_point"))) __##tp
+
+/**
+ * Macro to define the tracepoint arguments in RTE_TRACE_POINT macro.
+
+ * @see RTE_TRACE_POINT RTE_TRACE_POINT_DP
+ */
+#define RTE_TRACE_POINT_ARGS
+
+/** @internal Helper Macro to support RTE_TRACE_POINT and RTE_TRACE_POINT_DP */
+#define __RTE_TRACE_POINT(_mode, _tp, _args, ...)\
+extern rte_trace_t __##_tp;\
+static __rte_always_inline void \
+_tp _args \
+{\
+	__rte_trace_emit_header_##_mode(&__##_tp);\
+	__VA_ARGS__\
+}
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Create a tracepoint definition.
+ *
+ * A tracepoint definition defines, for a given tracepoint:
+ * - Its input arguments. They are the C function style parameters to define
+ * the arguments of tracepoint function. These input arguments embedded using
+ * RTE_TRACE_POINT_ARGS macro.
+ * - Its output event fields. They are the sources of event fields that form
+ * the payload of any event that the execution of the tracepoint macro emits
+ * for this particular tracepoint. The application uses rte_trace_ctf_* macros
+ * to emit the output event fields.
+ *
+ * @param tp
+ *   Tracepoint object. Before using the tracepoint, an application needs to
+ * define the tracepoint using RTE_TRACE_POINT_DEFINE() macro.
+ * @param args
+ *   C function style input arguments to define the arguments to tracepoint
+ * function.
+ * @param ...
+ *   Define the payload of trace function. The payload will be formed using
+ * rte_trace_ctf_* macros, Use ";" delimiter between two payloads.
+ *
+ * @see RTE_TRACE_POINT_ARGS, RTE_TRACE_POINT_DEFINE, rte_trace_ctf_*
+ */
+#define RTE_TRACE_POINT(tp, args, ...)\
+	__RTE_TRACE_POINT(generic, tp, args, __VA_ARGS__)
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Create a tracepoint definition for the data path.
+ *
+ * Similar to RTE_TRACE_POINT(), except that it is removed at compilation time
+ * using RTE_ENABLE_TRACE_DP configuration parameter.
+ *
+ * @param tp
+ *   Tracepoint object. Before using the tracepoint, an application needs to
+ * define the tracepoint using RTE_TRACE_POINT_DEFINE() macro.
+ * @param args
+ *   C function style input arguments to define the arguments to tracepoint
+ * function.
+ * @param ...
+ *   Define the payload of trace function. The payload will be formed using
+ * rte_trace_ctf_* macros, Use ";" delimiter between two payloads.
+ *
+ * @see rte_trace_is_dp_enabled, RTE_TRACE_POINT()
+ */
+#define RTE_TRACE_POINT_DP(tp, args, ...)\
+	__RTE_TRACE_POINT(dp, tp, args, __VA_ARGS__)
+
+#ifdef __DOXYGEN__
+
+/**
+ * Macro to select rte_trace_ctf_* definition for trace register function.
+ *
+ * rte_trace_ctf_* emits different definitions for trace function.
+ * Application must define RTE_TRACE_POINT_REGISTER_SELECT before including
+ * rte_trace.h in the C file where RTE_TRACE_POINT_REGISTER() used.
+ *
+ * @see RTE_TRACE_POINT_REGISTER()
+ */
+#define RTE_TRACE_POINT_REGISTER_SELECT
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Register a dynamic tracepoint.
+ *
+ * @param trace
+ *   The tracepoint object created using RTE_TRACE_POINT_DEFINE().
+ * @param name
+ *   The name of the tracepoint object.
+ * @param level
+ *   Trace level. A value between RTE_LOG_EMERG (1) and RTE_LOG_DEBUG (8).
+ * @return
+ *   - 0: Successfully registered the tracepoint.
+ *   - <0: Failure to register the tracepoint.
+ *
+ * @see RTE_TRACE_POINT_REGISTER_SELECT
+ */
+#define RTE_TRACE_POINT_REGISTER(trace, name, level)
+
+/** Tracepoint function payload for uint64_t datatype */
+#define rte_trace_ctf_u64(val)
+/** Tracepoint function payload for int64_t datatype */
+#define rte_trace_ctf_i64(val)
+/** Tracepoint function payload for uint32_t datatype */
+#define rte_trace_ctf_u32(val)
+/** Tracepoint function payload for int32_t datatype */
+#define rte_trace_ctf_i32(val)
+/** Tracepoint function payload for uint16_t datatype */
+#define rte_trace_ctf_u16(val)
+/** Tracepoint function payload for int16_t datatype */
+#define rte_trace_ctf_i16(val)
+/** Tracepoint function payload for uint8_t datatype */
+#define rte_trace_ctf_u8(val)
+/** Tracepoint function payload for int8_t datatype */
+#define rte_trace_ctf_i8(val)
+/** Tracepoint function payload for int datatype */
+#define rte_trace_ctf_int(val)
+/** Tracepoint function payload for long datatype */
+#define rte_trace_ctf_long(val)
+/** Tracepoint function payload for float datatype */
+#define rte_trace_ctf_float(val)
+/** Tracepoint function payload for double datatype */
+#define rte_trace_ctf_double(val)
+/** Tracepoint function payload for pointer datatype */
+#define rte_trace_ctf_ptr(val)
+/** Tracepoint function payload for string datatype */
+#define rte_trace_ctf_string(val)
+
+#endif /* __DOXYGEN__ */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_TRACE_H_ */
diff --git a/lib/librte_eal/common/meson.build b/lib/librte_eal/common/meson.build
index 2b97715a2..30fb9b85f 100644
--- a/lib/librte_eal/common/meson.build
+++ b/lib/librte_eal/common/meson.build
@@ -28,6 +28,7 @@ common_sources = files(
 	'eal_common_tailqs.c',
 	'eal_common_thread.c',
 	'eal_common_timer.c',
+	'eal_common_trace.c',
 	'eal_common_uuid.c',
 	'hotplug_mp.c',
 	'malloc_elem.c',
@@ -84,6 +85,7 @@ common_headers = files(
 	'include/rte_service_component.h',
 	'include/rte_string_fns.h',
 	'include/rte_tailq.h',
+	'include/rte_trace.h',
 	'include/rte_time.h',
 	'include/rte_uuid.h',
 	'include/rte_version.h',
diff --git a/lib/librte_eal/freebsd/eal/Makefile b/lib/librte_eal/freebsd/eal/Makefile
index b160b5790..b2fcc4212 100644
--- a/lib/librte_eal/freebsd/eal/Makefile
+++ b/lib/librte_eal/freebsd/eal/Makefile
@@ -60,6 +60,7 @@ SRCS-$(CONFIG_RTE_EXEC_ENV_FREEBSD) += eal_common_thread.c
 SRCS-$(CONFIG_RTE_EXEC_ENV_FREEBSD) += eal_common_proc.c
 SRCS-$(CONFIG_RTE_EXEC_ENV_FREEBSD) += eal_common_fbarray.c
 SRCS-$(CONFIG_RTE_EXEC_ENV_FREEBSD) += eal_common_uuid.c
+SRCS-$(CONFIG_RTE_EXEC_ENV_FREEBSD) += eal_common_trace.c
 SRCS-$(CONFIG_RTE_EXEC_ENV_FREEBSD) += rte_malloc.c
 SRCS-$(CONFIG_RTE_EXEC_ENV_FREEBSD) += hotplug_mp.c
 SRCS-$(CONFIG_RTE_EXEC_ENV_FREEBSD) += malloc_elem.c
diff --git a/lib/librte_eal/linux/eal/Makefile b/lib/librte_eal/linux/eal/Makefile
index e70cf104a..95470d3bb 100644
--- a/lib/librte_eal/linux/eal/Makefile
+++ b/lib/librte_eal/linux/eal/Makefile
@@ -68,6 +68,7 @@ SRCS-$(CONFIG_RTE_EXEC_ENV_LINUX) += eal_common_thread.c
 SRCS-$(CONFIG_RTE_EXEC_ENV_LINUX) += eal_common_proc.c
 SRCS-$(CONFIG_RTE_EXEC_ENV_LINUX) += eal_common_fbarray.c
 SRCS-$(CONFIG_RTE_EXEC_ENV_LINUX) += eal_common_uuid.c
+SRCS-$(CONFIG_RTE_EXEC_ENV_LINUX) += eal_common_trace.c
 SRCS-$(CONFIG_RTE_EXEC_ENV_LINUX) += rte_malloc.c
 SRCS-$(CONFIG_RTE_EXEC_ENV_LINUX) += hotplug_mp.c
 SRCS-$(CONFIG_RTE_EXEC_ENV_LINUX) += malloc_elem.c
-- 
2.25.1