Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull perf fixes from Thomas Gleixner:

 - plug a memory leak in the intel pmu init code

 - clang fixes

 - tooling fix to avoid including kernel headers

 - a fix for jvmti to generate correct debug information for inlined
   code

 - replace backtick with a regular shell function

 - fix the build in hardened environments

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/intel: Plug memory leak in intel_pmu_init()
  x86/asm: Allow again using asm.h when building for the 'bpf' clang target
  tools arch s390: Do not include header files from the kernel sources
  perf jvmti: Generate correct debug information for inlined code
  perf tools: Fix up build in hardened environments
  perf tools: Use shell function for perl cflags retrieval

arch/x86/events/intel/core.c

@@ -3847,6 +3847,8 @@ static struct attribute *intel_pmu_attrs[] = {
 
 __init int intel_pmu_init(void)
 {
+	struct attribute **extra_attr = NULL;
+	struct attribute **to_free = NULL;
 	union cpuid10_edx edx;
 	union cpuid10_eax eax;
 	union cpuid10_ebx ebx;
@@ -3854,7 +3856,6 @@ __init int intel_pmu_init(void)
 	unsigned int unused;
 	struct extra_reg *er;
 	int version, i;
-	struct attribute **extra_attr = NULL;
 	char *name;
 
 	if (!cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON)) {
@@ -4294,6 +4295,7 @@ __init int intel_pmu_init(void)
 		extra_attr = boot_cpu_has(X86_FEATURE_RTM) ?
 			hsw_format_attr : nhm_format_attr;
 		extra_attr = merge_attr(extra_attr, skl_format_attr);
+		to_free = extra_attr;
 		x86_pmu.cpu_events = get_hsw_events_attrs();
 		intel_pmu_pebs_data_source_skl(
 			boot_cpu_data.x86_model == INTEL_FAM6_SKYLAKE_X);
@@ -4401,6 +4403,7 @@ __init int intel_pmu_init(void)
 		pr_cont("full-width counters, ");
 	}
 
+	kfree(to_free);
 	return 0;
 }
 

arch/x86/include/asm/asm.h

@@ -136,6 +136,7 @@
 #endif
 
 #ifndef __ASSEMBLY__
+#ifndef __BPF__
 /*
  * This output constraint should be used for any inline asm which has a "call"
  * instruction.  Otherwise the asm may be inserted before the frame pointer
@@ -145,5 +146,6 @@
 register unsigned long current_stack_pointer asm(_ASM_SP);
 #define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
 #endif
+#endif
 
 #endif /* _ASM_X86_ASM_H */

tools/arch/s390/include/uapi/asm/perf_regs.h

+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _ASM_S390_PERF_REGS_H
+#define _ASM_S390_PERF_REGS_H
+
+enum perf_event_s390_regs {
+	PERF_REG_S390_R0,
+	PERF_REG_S390_R1,
+	PERF_REG_S390_R2,
+	PERF_REG_S390_R3,
+	PERF_REG_S390_R4,
+	PERF_REG_S390_R5,
+	PERF_REG_S390_R6,
+	PERF_REG_S390_R7,
+	PERF_REG_S390_R8,
+	PERF_REG_S390_R9,
+	PERF_REG_S390_R10,
+	PERF_REG_S390_R11,
+	PERF_REG_S390_R12,
+	PERF_REG_S390_R13,
+	PERF_REG_S390_R14,
+	PERF_REG_S390_R15,
+	PERF_REG_S390_FP0,
+	PERF_REG_S390_FP1,
+	PERF_REG_S390_FP2,
+	PERF_REG_S390_FP3,
+	PERF_REG_S390_FP4,
+	PERF_REG_S390_FP5,
+	PERF_REG_S390_FP6,
+	PERF_REG_S390_FP7,
+	PERF_REG_S390_FP8,
+	PERF_REG_S390_FP9,
+	PERF_REG_S390_FP10,
+	PERF_REG_S390_FP11,
+	PERF_REG_S390_FP12,
+	PERF_REG_S390_FP13,
+	PERF_REG_S390_FP14,
+	PERF_REG_S390_FP15,
+	PERF_REG_S390_MASK,
+	PERF_REG_S390_PC,
+
+	PERF_REG_S390_MAX
+};
+
+#endif /* _ASM_S390_PERF_REGS_H */

tools/perf/Makefile.config

@@ -188,9 +188,7 @@ ifdef PYTHON_CONFIG
   PYTHON_EMBED_LDFLAGS := $(call strip-libs,$(PYTHON_EMBED_LDOPTS))
   PYTHON_EMBED_LIBADD := $(call grep-libs,$(PYTHON_EMBED_LDOPTS)) -lutil
   PYTHON_EMBED_CCOPTS := $(shell $(PYTHON_CONFIG_SQ) --cflags 2>/dev/null)
-  ifeq ($(CC_NO_CLANG), 1)
   PYTHON_EMBED_CCOPTS := $(filter-out -specs=%,$(PYTHON_EMBED_CCOPTS))
-  endif
   FLAGS_PYTHON_EMBED := $(PYTHON_EMBED_CCOPTS) $(PYTHON_EMBED_LDOPTS)
 endif
 
@@ -576,14 +574,15 @@ ifndef NO_GTK2
   endif
 endif
 
-
 ifdef NO_LIBPERL
   CFLAGS += -DNO_LIBPERL
 else
   PERL_EMBED_LDOPTS = $(shell perl -MExtUtils::Embed -e ldopts 2>/dev/null)
   PERL_EMBED_LDFLAGS = $(call strip-libs,$(PERL_EMBED_LDOPTS))
   PERL_EMBED_LIBADD = $(call grep-libs,$(PERL_EMBED_LDOPTS))
-  PERL_EMBED_CCOPTS = `perl -MExtUtils::Embed -e ccopts 2>/dev/null`
+  PERL_EMBED_CCOPTS = $(shell perl -MExtUtils::Embed -e ccopts 2>/dev/null)
+  PERL_EMBED_CCOPTS := $(filter-out -specs=%,$(PERL_EMBED_CCOPTS))
+  PERL_EMBED_LDOPTS := $(filter-out -specs=%,$(PERL_EMBED_LDOPTS))
   FLAGS_PERL_EMBED=$(PERL_EMBED_CCOPTS) $(PERL_EMBED_LDOPTS)
 
   ifneq ($(feature-libperl), 1)

tools/perf/arch/s390/include/perf_regs.h

@@ -3,7 +3,7 @@
 
 #include <stdlib.h>
 #include <linux/types.h>
-#include <../../../../arch/s390/include/uapi/asm/perf_regs.h>
+#include <asm/perf_regs.h>
 
 void perf_regs_load(u64 *regs);
 

tools/perf/check-headers.sh

@@ -21,6 +21,7 @@ arch/x86/include/asm/cpufeatures.h
 arch/arm/include/uapi/asm/perf_regs.h
 arch/arm64/include/uapi/asm/perf_regs.h
 arch/powerpc/include/uapi/asm/perf_regs.h
+arch/s390/include/uapi/asm/perf_regs.h
 arch/x86/include/uapi/asm/perf_regs.h
 arch/x86/include/uapi/asm/kvm.h
 arch/x86/include/uapi/asm/kvm_perf.h

tools/perf/jvmti/jvmti_agent.c

@@ -384,13 +384,13 @@ jvmti_write_code(void *agent, char const *sym,
 }
 
 int
-jvmti_write_debug_info(void *agent, uint64_t code, const char *file,
-		       jvmti_line_info_t *li, int nr_lines)
+jvmti_write_debug_info(void *agent, uint64_t code,
+    int nr_lines, jvmti_line_info_t *li,
+    const char * const * file_names)
 {
 	struct jr_code_debug_info rec;
-	size_t sret, len, size, flen;
+	size_t sret, len, size, flen = 0;
 	uint64_t addr;
-	const char *fn = file;
 	FILE *fp = agent;
 	int i;
 
@@ -405,7 +405,9 @@ jvmti_write_debug_info(void *agent, uint64_t code, const char *file,
 		return -1;
 	}
 
-	flen = strlen(file) + 1;
+	for (i = 0; i < nr_lines; ++i) {
+	    flen += strlen(file_names[i]) + 1;
+	}
 
 	rec.p.id        = JIT_CODE_DEBUG_INFO;
 	size            = sizeof(rec);
@@ -421,7 +423,7 @@ jvmti_write_debug_info(void *agent, uint64_t code, const char *file,
 	 * file[]   : source file name
 	 */
 	size += nr_lines * sizeof(struct debug_entry);
-	size += flen * nr_lines;
+	size += flen;
 	rec.p.total_size = size;
 
 	/*
@@ -452,7 +454,7 @@ jvmti_write_debug_info(void *agent, uint64_t code, const char *file,
 		if (sret != 1)
 			goto error;
 
-		sret = fwrite_unlocked(fn, flen, 1, fp);
+		sret = fwrite_unlocked(file_names[i], strlen(file_names[i]) + 1, 1, fp);
 		if (sret != 1)
 			goto error;
 	}

tools/perf/jvmti/jvmti_agent.h

@@ -14,6 +14,7 @@ typedef struct {
 	unsigned long	pc;
 	int		line_number;
 	int		discrim; /* discriminator -- 0 for now */
+	jmethodID	methodID;
 } jvmti_line_info_t;
 
 void *jvmti_open(void);
@@ -22,11 +23,9 @@ int   jvmti_write_code(void *agent, char const *symbol_name,
 		       uint64_t vma, void const *code,
 		       const unsigned int code_size);
 
-int   jvmti_write_debug_info(void *agent,
-		             uint64_t code,
-			     const char *file,
+int   jvmti_write_debug_info(void *agent, uint64_t code, int nr_lines,
 			     jvmti_line_info_t *li,
-			     int nr_lines);
+			     const char * const * file_names);
 
 #if defined(__cplusplus)
 }

tools/perf/jvmti/libjvmti.c

@@ -47,6 +47,7 @@ do_get_line_numbers(jvmtiEnv *jvmti, void *pc, jmethodID m, jint bci,
 			tab[lines].pc = (unsigned long)pc;
 			tab[lines].line_number = loc_tab[i].line_number;
 			tab[lines].discrim = 0; /* not yet used */
+			tab[lines].methodID = m;
 			lines++;
 		} else {
 			break;
@@ -125,6 +126,99 @@ get_line_numbers(jvmtiEnv *jvmti, const void *compile_info, jvmti_line_info_t **
 	return JVMTI_ERROR_NONE;
 }
 
+static void
+copy_class_filename(const char * class_sign, const char * file_name, char * result, size_t max_length)
+{
+	/*
+	* Assume path name is class hierarchy, this is a common practice with Java programs
+	*/
+	if (*class_sign == 'L') {
+		int j, i = 0;
+		char *p = strrchr(class_sign, '/');
+		if (p) {
+			/* drop the 'L' prefix and copy up to the final '/' */
+			for (i = 0; i < (p - class_sign); i++)
+				result[i] = class_sign[i+1];
+		}
+		/*
+		* append file name, we use loops and not string ops to avoid modifying
+		* class_sign which is used later for the symbol name
+		*/
+		for (j = 0; i < (max_length - 1) && file_name && j < strlen(file_name); j++, i++)
+			result[i] = file_name[j];
+
+		result[i] = '\0';
+	} else {
+		/* fallback case */
+		size_t file_name_len = strlen(file_name);
+		strncpy(result, file_name, file_name_len < max_length ? file_name_len : max_length);
+	}
+}
+
+static jvmtiError
+get_source_filename(jvmtiEnv *jvmti, jmethodID methodID, char ** buffer)
+{
+	jvmtiError ret;
+	jclass decl_class;
+	char *file_name = NULL;
+	char *class_sign = NULL;
+	char fn[PATH_MAX];
+	size_t len;
+
+	ret = (*jvmti)->GetMethodDeclaringClass(jvmti, methodID, &decl_class);
+	if (ret != JVMTI_ERROR_NONE) {
+		print_error(jvmti, "GetMethodDeclaringClass", ret);
+		return ret;
+	}
+
+	ret = (*jvmti)->GetSourceFileName(jvmti, decl_class, &file_name);
+	if (ret != JVMTI_ERROR_NONE) {
+		print_error(jvmti, "GetSourceFileName", ret);
+		return ret;
+	}
+
+	ret = (*jvmti)->GetClassSignature(jvmti, decl_class, &class_sign, NULL);
+	if (ret != JVMTI_ERROR_NONE) {
+		print_error(jvmti, "GetClassSignature", ret);
+		goto free_file_name_error;
+	}
+
+	copy_class_filename(class_sign, file_name, fn, PATH_MAX);
+	len = strlen(fn);
+	*buffer = malloc((len + 1) * sizeof(char));
+	if (!*buffer) {
+		print_error(jvmti, "GetClassSignature", ret);
+		ret = JVMTI_ERROR_OUT_OF_MEMORY;
+		goto free_class_sign_error;
+	}
+	strcpy(*buffer, fn);
+	ret = JVMTI_ERROR_NONE;
+
+free_class_sign_error:
+	(*jvmti)->Deallocate(jvmti, (unsigned char *)class_sign);
+free_file_name_error:
+	(*jvmti)->Deallocate(jvmti, (unsigned char *)file_name);
+
+	return ret;
+}
+
+static jvmtiError
+fill_source_filenames(jvmtiEnv *jvmti, int nr_lines,
+		      const jvmti_line_info_t * line_tab,
+		      char ** file_names)
+{
+	int index;
+	jvmtiError ret;
+
+	for (index = 0; index < nr_lines; ++index) {
+		ret = get_source_filename(jvmti, line_tab[index].methodID, &(file_names[index]));
+		if (ret != JVMTI_ERROR_NONE)
+			return ret;
+	}
+
+	return JVMTI_ERROR_NONE;
+}
+
 static void JNICALL
 compiled_method_load_cb(jvmtiEnv *jvmti,
 			jmethodID method,
@@ -135,16 +229,18 @@ compiled_method_load_cb(jvmtiEnv *jvmti,
 			const void *compile_info)
 {
 	jvmti_line_info_t *line_tab = NULL;
+	char ** line_file_names = NULL;
 	jclass decl_class;
 	char *class_sign = NULL;
 	char *func_name = NULL;
 	char *func_sign = NULL;
-	char *file_name= NULL;
+	char *file_name = NULL;
 	char fn[PATH_MAX];
 	uint64_t addr = (uint64_t)(uintptr_t)code_addr;
 	jvmtiError ret;
 	int nr_lines = 0; /* in line_tab[] */
 	size_t len;
+	int output_debug_info = 0;
 
 	ret = (*jvmti)->GetMethodDeclaringClass(jvmti, method,
 						&decl_class);
@@ -158,6 +254,19 @@ compiled_method_load_cb(jvmtiEnv *jvmti,
 		if (ret != JVMTI_ERROR_NONE) {
 			warnx("jvmti: cannot get line table for method");
 			nr_lines = 0;
+		} else if (nr_lines > 0) {
+			line_file_names = malloc(sizeof(char*) * nr_lines);
+			if (!line_file_names) {
+				warnx("jvmti: cannot allocate space for line table method names");
+			} else {
+				memset(line_file_names, 0, sizeof(char*) * nr_lines);
+				ret = fill_source_filenames(jvmti, nr_lines, line_tab, line_file_names);
+				if (ret != JVMTI_ERROR_NONE) {
+					warnx("jvmti: fill_source_filenames failed");
+				} else {
+					output_debug_info = 1;
+				}
+			}
 		}
 	}
 
@@ -181,32 +290,13 @@ compiled_method_load_cb(jvmtiEnv *jvmti,
 		goto error;
 	}
 
-	/*
-	 * Assume path name is class hierarchy, this is a common practice with Java programs
-	 */
-	if (*class_sign == 'L') {
-		int j, i = 0;
-		char *p = strrchr(class_sign, '/');
-		if (p) {
-			/* drop the 'L' prefix and copy up to the final '/' */
-			for (i = 0; i < (p - class_sign); i++)
-				fn[i] = class_sign[i+1];
-		}
-		/*
-		 * append file name, we use loops and not string ops to avoid modifying
-		 * class_sign which is used later for the symbol name
-		 */
-		for (j = 0; i < (PATH_MAX - 1) && file_name && j < strlen(file_name); j++, i++)
-			fn[i] = file_name[j];
-		fn[i] = '\0';
-	} else {
-		/* fallback case */
-		strcpy(fn, file_name);
-	}
+	copy_class_filename(class_sign, file_name, fn, PATH_MAX);
+
 	/*
 	 * write source line info record if we have it
 	 */
-	if (jvmti_write_debug_info(jvmti_agent, addr, fn, line_tab, nr_lines))
+	if (output_debug_info)
+		if (jvmti_write_debug_info(jvmti_agent, addr, nr_lines, line_tab, (const char * const *) line_file_names))
 			warnx("jvmti: write_debug_info() failed");
 
 	len = strlen(func_name) + strlen(class_sign) + strlen(func_sign) + 2;
@@ -223,6 +313,13 @@ compiled_method_load_cb(jvmtiEnv *jvmti,
 	(*jvmti)->Deallocate(jvmti, (unsigned char *)class_sign);
 	(*jvmti)->Deallocate(jvmti, (unsigned char *)file_name);
 	free(line_tab);
+	while (line_file_names && (nr_lines > 0)) {
+	    if (line_file_names[nr_lines - 1]) {
+	        free(line_file_names[nr_lines - 1]);
+	    }
+	    nr_lines -= 1;
+	}
+	free(line_file_names);
 }
 
 static void JNICALL