gcov: use kvmalloc()

Using vmalloc() in gcov is really quite wasteful, many of the objects
allocated are really small (e.g.  I've seen 24 bytes.) Use kvmalloc() to
automatically pick the better of kmalloc() or vmalloc() depending on the
size.

[johannes.berg@intel.com: fix clang-11+ build]
  Link: https://lkml.kernel.org/r/20210412214210.6e1ecca9cdc5.I24459763acf0591d5e6b31c7e3a59890d802f79c@changeid

Link: https://lkml.kernel.org/r/20210315235453.799e7a9d627d.I741d0db096c6f312910f7f1bcdfde0fda20801a4@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Cc: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/gcov/clang.c

@@ -49,7 +49,7 @@
 #include <linux/printk.h>
 #include <linux/ratelimit.h>
 #include <linux/slab.h>
-#include <linux/vmalloc.h>
+#include <linux/mm.h>
 #include "gcov.h"
 
 typedef void (*llvm_gcov_callback)(void);
@@ -333,8 +333,8 @@ void gcov_info_add(struct gcov_info *dst, struct gcov_info *src)
 static struct gcov_fn_info *gcov_fn_info_dup(struct gcov_fn_info *fn)
 {
 	size_t cv_size; /* counter values size */
-	struct gcov_fn_info *fn_dup = kmemdup(fn, sizeof(*fn),
-			GFP_KERNEL);
+	struct gcov_fn_info *fn_dup = kmemdup(fn, sizeof(*fn), GFP_KERNEL);
+
 	if (!fn_dup)
 		return NULL;
 	INIT_LIST_HEAD(&fn_dup->head);
@@ -344,7 +344,7 @@ static struct gcov_fn_info *gcov_fn_info_dup(struct gcov_fn_info *fn)
 		goto err_name;
 
 	cv_size = fn->num_counters * sizeof(fn->counters[0]);
-	fn_dup->counters = vmalloc(cv_size);
+	fn_dup->counters = kvmalloc(cv_size, GFP_KERNEL);
 	if (!fn_dup->counters)
 		goto err_counters;
 	memcpy(fn_dup->counters, fn->counters, cv_size);
@@ -368,7 +368,7 @@ static struct gcov_fn_info *gcov_fn_info_dup(struct gcov_fn_info *fn)
 	INIT_LIST_HEAD(&fn_dup->head);
 
 	cv_size = fn->num_counters * sizeof(fn->counters[0]);
-	fn_dup->counters = vmalloc(cv_size);
+	fn_dup->counters = kvmalloc(cv_size, GFP_KERNEL);
 	if (!fn_dup->counters) {
 		kfree(fn_dup);
 		return NULL;
@@ -439,7 +439,7 @@ void gcov_info_free(struct gcov_info *info)
 	struct gcov_fn_info *fn, *tmp;
 
 	list_for_each_entry_safe(fn, tmp, &info->functions, head) {
-		vfree(fn->counters);
+		kvfree(fn->counters);
 		list_del(&fn->head);
 		kfree(fn);
 	}

kernel/gcov/fs.c

@@ -26,7 +26,7 @@
 #include <linux/slab.h>
 #include <linux/mutex.h>
 #include <linux/seq_file.h>
-#include <linux/vmalloc.h>
+#include <linux/mm.h>
 #include "gcov.h"
 
 /**
@@ -116,7 +116,7 @@ static struct gcov_iterator *gcov_iter_new(struct gcov_info *info)
 	/* Dry-run to get the actual buffer size. */
 	size = convert_to_gcda(NULL, info);
 
-	iter = vmalloc(struct_size(iter, buffer, size));
+	iter = kvmalloc(struct_size(iter, buffer, size), GFP_KERNEL);
 	if (!iter)
 		return NULL;
 
@@ -134,7 +134,7 @@ static struct gcov_iterator *gcov_iter_new(struct gcov_info *info)
  */
 static void gcov_iter_free(struct gcov_iterator *iter)
 {
-	vfree(iter);
+	kvfree(iter);
 }
 
 /**

kernel/gcov/gcc_4_7.c

@@ -15,7 +15,7 @@
 #include <linux/errno.h>
 #include <linux/slab.h>
 #include <linux/string.h>
-#include <linux/vmalloc.h>
+#include <linux/mm.h>
 #include "gcov.h"
 
 #if (__GNUC__ >= 10)
@@ -309,7 +309,7 @@ struct gcov_info *gcov_info_dup(struct gcov_info *info)
 
 			cv_size = sizeof(gcov_type) * sci_ptr->num;
 
-			dci_ptr->values = vmalloc(cv_size);
+			dci_ptr->values = kvmalloc(cv_size, GFP_KERNEL);
 
 			if (!dci_ptr->values)
 				goto err_free;
@@ -351,7 +351,7 @@ void gcov_info_free(struct gcov_info *info)
 		ci_ptr = info->functions[fi_idx]->ctrs;
 
 		for (ct_idx = 0; ct_idx < active; ct_idx++, ci_ptr++)
-			vfree(ci_ptr->values);
+			kvfree(ci_ptr->values);
 
 		kfree(info->functions[fi_idx]);
 	}