From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <001701c2e8d0$a017ef80$370da8c0@aman>
From: "Aman" <aman@mistralsoftware.com>
To: "linuxppc embedded" <linuxppc-embedded@lists.linuxppc.org>
Subject: Memory Leak
Date: Thu, 13 Mar 2003 01:20:25 +0530
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 Hi All
 I am using consistent_alloc () to allocate consistent memory for DMA.  When
I free the buffers using consistent_free(), the /proc/meminfo shows a
memory leak of the buffer size allocated.

 I have attached a  module code to allocate memory when inserted and free
 when removed. The memory leak can be found using the command cat
/proc/meminfo.

 Also the consistent_alloc call gives an error something like "Kernel bug at
cachemap.." if we try to allocate more than 2MB.

Can anyone help me in solving these issues

Thanking you in advance
Regards
Aman




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	filename="alloc_test.c"

#define __NO_VERSION__=0A=
#include <linux/module.h>=0A=
#include <linux/version.h>=0A=
#include <linux/init.h>=0A=
#include <linux/kernel.h>=0A=
#include <linux/fs.h>=0A=
#include <linux/slab.h>=0A=
#include <linux/sched.h>=0A=
#include <linux/ioctl.h>=0A=
#include <linux/proc_fs.h>=0A=
#include <linux/wrapper.h>=0A=
#include <asm/io.h>=0A=
=0A=
=0A=
typedef int sint32_t;=0A=
=0A=
char kernel_version[]=3D UTS_RELEASE;=0A=
=0A=
uint8_t        *pu8_buffer;=0A=
=0A=
int init_module (void)=0A=
{=0A=
    dma_addr_t      str_phys_addr;=0A=
=0A=
    printk ("Init module\n");=0A=
=0A=
    pu8_buffer =3D consistent_alloc (GFP_KERNEL, 0x200000, =
&str_phys_addr);=0A=
=0A=
    if (pu8_buffer =3D=3D NULL)=0A=
    {=0A=
        printk ("Could not allocate memory\n");=0A=
=0A=
        return 0;=0A=
    }=0A=
=0A=
    printk ("Physical address =3D 0x%x\n", str_phys_addr);=0A=
    printk ("Virtual address =3D 0x%x\n", (uint32_t) pu8_buffer);=0A=
=0A=
    return 0;=0A=
}=0A=
=0A=
void cleanup_module (void)=0A=
{=0A=
    printk ("Freeing )x%x\n", (uint32_t) pu8_buffer);=0A=
=0A=
    consistent_free (pu8_buffer);=0A=
=0A=
    return;=0A=
}=0A=

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