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Commit 2e1483c9 authored by Catalin Marinas's avatar Catalin Marinas
Browse files

kmemleak: Remove some of the kmemleak false positives 



There are allocations for which the main pointer cannot be found but
they are not memory leaks. This patch fixes some of them. For more
information on false positives, see Documentation/kmemleak.txt.

Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 4f2294b6

drivers/char/vt.c

+7 −0
Original line number Diff line number Diff line
@@ -104,6 +104,7 @@ 
#include <linux/io.h>

#include <asm/system.h>

#include <linux/uaccess.h>

#include <linux/kmemleak.h>



#define MAX_NR_CON_DRIVER 16
@@ -2880,6 +2881,12 @@ static int __init con_init(void) 
	 */

	for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {

		vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));

		/*

		 * Kmemleak does not track the memory allocated via

		 * alloc_bootmem() but this block contains pointers to

		 * other blocks allocated via kmalloc.

		 */

		kmemleak_alloc(vc, sizeof(struct vc_data), 1, GFP_ATOMIC);

		INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);

		visual_init(vc, currcons, 1);

		vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);

fs/block_dev.c

+6 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ 
#include <linux/uio.h>

#include <linux/namei.h>

#include <linux/log2.h>

#include <linux/kmemleak.h>

#include <asm/uaccess.h>

#include "internal.h"
@@ -492,6 +493,11 @@ void __init bdev_cache_init(void) 
	bd_mnt = kern_mount(&bd_type);

	if (IS_ERR(bd_mnt))

		panic("Cannot create bdev pseudo-fs");

	/*

	 * This vfsmount structure is only used to obtain the

	 * blockdev_superblock, so tell kmemleak not to report it.

	 */

	kmemleak_not_leak(bd_mnt);

	blockdev_superblock = bd_mnt->mnt_sb;	/* For writeback */

}

include/linux/percpu.h

+5 −0
Original line number Diff line number Diff line
@@ -86,7 +86,12 @@ struct percpu_data { 
	void *ptrs[1];

};



/* pointer disguising messes up the kmemleak objects tracking */

#ifndef CONFIG_DEBUG_KMEMLEAK

#define __percpu_disguise(pdata) (struct percpu_data *)~(unsigned long)(pdata)

#else

#define __percpu_disguise(pdata) (struct percpu_data *)(pdata)

#endif



#define per_cpu_ptr(ptr, cpu)						\

({									\