[Linux-ia64] Integer to Pointer Cast Warnings when Building 2.4.17

[Linux-ia64] Integer to Pointer Cast Warnings when Building 2.4.17

[LAKSHMIPATHY,ARUN (HP-India,ex2)]

Hi,

I Get an integer to pointer typecast warning from some of the sources when
building the 2.4.17 kernel, I am using the base 2.4.17 kernel and the ia64
patch with no other patches, the kernel builds fine and comes up fine.
Wanted to be sure that this is not a cause for concern. Enclosed below is
the excerpt of the build o/p.

make[1]: Entering directory `/kernel/linux/arch/ia64/ia32'
sys_ia32.c: In function `sys32_brk':
sys_ia32.c:3824: warning: passing arg 1 of `__do_clear_user' makes pointer
from integer without a cast

make[4]: Entering directory `/kernel/linux/drivers/acpi/dispatcher'
dswexec.c: In function `acpi_ds_exec_end_op':
dswexec.c:580: warning: cast from pointer to integer of different size 

make[4]: Entering directory `/kernel/linux/drivers/acpi/events'
evevent.c: In function `acpi_ev_asynch_execute_gpe_method':
evevent.c:686: warning: cast from pointer to integer of different size
evevent.c: In function `acpi_ev_gpe_dispatch':
evevent.c:802: warning: cast to pointer from integer of different size

make[3]: Entering directory `/kernel/linux/drivers/acpi'
os.c: In function `acpi_os_get_root_pointer':
os.c:206: warning: assignment makes integer from pointer without a cast

make[3]: Entering directory `/kernel/linux/drivers/scsi'
megaraid.c: In function `megaraid_queue':
megaraid.c:3805: warning: cast to pointer from integer of different size

Regards
Arun

RE: [Linux-ia64] Integer to Pointer Cast Warnings when Building 2

[Matt_Domsch]

> make[3]: Entering directory `/kernel/linux/drivers/scsi'
> megaraid.c: In function `megaraid_queue':
> megaraid.c:3805: warning: cast to pointer from integer of 
> different size

This one is OK, albeit not obvious.  That's inside an ioctl that can only be
called by a 32-bit user space application (no equivalent 64-bit app exists).
The code is:

  char *user_area = NULL;    
  user_area = (char *)*((u32*)&pScb->SCpnt->cmnd[4]);
  copy_to_user(user_area,...)

a 32-bit value which is a pointer inside a 32-bit application gets promoted
to a 64-bit pointer inside the ioctl so that copy_to_user can be used.

Thanks,
Matt 

--
Matt Domsch
Sr. Software Engineer
Dell Linux Solutions www.dell.com/linux
Linux on Dell mailing lists @ http://lists.us.dell.com
#1 US Linux Server provider for 2001!

Re: [Linux-ia64] Integer to Pointer Cast Warnings when Building 2.4.17

[n0ano]

Arun-

Looks like the prototype for `__do_clear_user' changed, I can fix this
when I get home this evening.

On Mon, Jun 03, 2002 at 05:57:47PM +0530, LAKSHMIPATHY,ARUN (HP-India,ex2) wrote:
> Hi,
> 
> I Get an integer to pointer typecast warning from some of the sources when
> building the 2.4.17 kernel, I am using the base 2.4.17 kernel and the ia64
> patch with no other patches, the kernel builds fine and comes up fine.
> Wanted to be sure that this is not a cause for concern. Enclosed below is
> the excerpt of the build o/p.
> 
> make[1]: Entering directory `/kernel/linux/arch/ia64/ia32'
> sys_ia32.c: In function `sys32_brk':
> sys_ia32.c:3824: warning: passing arg 1 of `__do_clear_user' makes pointer
> from integer without a cast
> 

-- 
Don Dugger
"Censeo Toto nos in Kansa esse decisse." - D. Gale
n0ano@indstorage.com
Ph: 303/652-0870x117

Re: [Linux-ia64] Integer to Pointer Cast Warnings when Building 2.4.17

[David Mosberger]

>>>>> On Mon, 3 Jun 2002 17:57:47 +0530, "LAKSHMIPATHY,ARUN (HP-India,ex2)" <arun_lakshmipathy@hp.com> said:

  Arun> make[4]: Entering directory
  Arun> `/kernel/linux/drivers/acpi/dispatcher' dswexec.c: In function
  Arun> `acpi_ds_exec_end_op': dswexec.c:580: warning: cast from
  Arun> pointer to integer of different size

  Arun> make[4]: Entering directory
  Arun> `/kernel/linux/drivers/acpi/events' evevent.c: In function
  Arun> `acpi_ev_asynch_execute_gpe_method': evevent.c:686: warning:
  Arun> cast from pointer to integer of different size evevent.c: In
  Arun> function `acpi_ev_gpe_dispatch': evevent.c:802: warning: cast
  Arun> to pointer from integer of different size

  Arun> make[3]: Entering directory `/kernel/linux/drivers/acpi' os.c:
  Arun> In function `acpi_os_get_root_pointer': os.c:206: warning:
  Arun> assignment makes integer from pointer without a cast

These come from the ACPI subsystem.  They annoy me, too, but it's up
to the ACPI folks to fix them.  It's possible they're already fixed in
the latest ACPI drops.

	--david

Re: [Linux-ia64] Integer to Pointer Cast Warnings when Building 2.4.17

[Matthew Wilcox]

On Mon, Jun 03, 2002 at 10:23:09AM -0700, David Mosberger wrote:
> These come from the ACPI subsystem.  They annoy me, too, but it's up
> to the ACPI folks to fix them.  It's possible they're already fixed in
> the latest ACPI drops.

When compiling my current tree which includes ACPI CA 20020517, the only
warning I get is:

pci_irq.c: In function `acpi_pci_irq_enable':
pci_irq.c:304: warning: unused variable `irq_mask'

which is a fairly benign type of warning.

-- 
Revolutions do not require corporate support.