* [PATCH] powerpc: fix uninitialised error in numa.c
@ 2012-06-20 4:17 Michael Neuling
2012-06-20 5:38 ` Tony Breeds
0 siblings, 1 reply; 4+ messages in thread
From: Michael Neuling @ 2012-06-20 4:17 UTC (permalink / raw)
To: benh, Jimi Xenidis; +Cc: linuxppc-dev
chroma_defconfig currently gives me this with gcc 4.6:
arch/powerpc/mm/numa.c:638:13: error: 'dm' may be used uninitialized in this function [-Werror=uninitialized]
It's a bogus warning since of_get_drconf_memory() only writes it
anyway.
Signed-off-by: Michael Neuling <mikey@neuling.org>
cc: stable@kernel.org
---
Also affects 3.4 and 3.3 stable.
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 5ca3a15..880acde 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -637,7 +637,7 @@ static inline int __init read_usm_ranges(const u32 **usm)
*/
static void __init parse_drconf_memory(struct device_node *memory)
{
- const u32 *dm, *usm;
+ const u32 *dm = NULL, *usm;
unsigned int n, rc, ranges, is_kexec_kdump = 0;
unsigned long lmb_size, base, size, sz;
int nid;
^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [PATCH] powerpc: fix uninitialised error in numa.c
2012-06-20 4:17 [PATCH] powerpc: fix uninitialised error in numa.c Michael Neuling
@ 2012-06-20 5:38 ` Tony Breeds
2012-06-20 5:46 ` Michael Neuling
0 siblings, 1 reply; 4+ messages in thread
From: Tony Breeds @ 2012-06-20 5:38 UTC (permalink / raw)
To: Michael Neuling; +Cc: linuxppc-dev
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On Wed, Jun 20, 2012 at 02:17:47PM +1000, Michael Neuling wrote:
> chroma_defconfig currently gives me this with gcc 4.6:
> arch/powerpc/mm/numa.c:638:13: error: 'dm' may be used uninitialized in this function [-Werror=uninitialized]
>
> It's a bogus warning since of_get_drconf_memory() only writes it
> anyway.
>
> Signed-off-by: Michael Neuling <mikey@neuling.org>
> cc: stable@kernel.org
> ---
> Also affects 3.4 and 3.3 stable.
>
> diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
> index 5ca3a15..880acde 100644
> --- a/arch/powerpc/mm/numa.c
> +++ b/arch/powerpc/mm/numa.c
> @@ -637,7 +637,7 @@ static inline int __init read_usm_ranges(const u32 **usm)
> */
> static void __init parse_drconf_memory(struct device_node *memory)
> {
> - const u32 *dm, *usm;
> + const u32 *dm = NULL, *usm;
Woot bikeshed! I think that's what the uninitialized_var() macro is for.
Yours Tony
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^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] powerpc: fix uninitialised error in numa.c
2012-06-20 5:38 ` Tony Breeds
@ 2012-06-20 5:46 ` Michael Neuling
2012-06-20 6:01 ` Michael Neuling
0 siblings, 1 reply; 4+ messages in thread
From: Michael Neuling @ 2012-06-20 5:46 UTC (permalink / raw)
To: Tony Breeds; +Cc: linuxppc-dev
Tony Breeds <tony@bakeyournoodle.com> wrote:
> On Wed, Jun 20, 2012 at 02:17:47PM +1000, Michael Neuling wrote:
> > chroma_defconfig currently gives me this with gcc 4.6:
> > arch/powerpc/mm/numa.c:638:13: error: 'dm' may be used uninitialized in this function [-Werror=uninitialized]
> >
> > It's a bogus warning since of_get_drconf_memory() only writes it
> > anyway.
> >
> > Signed-off-by: Michael Neuling <mikey@neuling.org>
> > cc: stable@kernel.org
> > ---
> > Also affects 3.4 and 3.3 stable.
> >
> > diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
> > index 5ca3a15..880acde 100644
> > --- a/arch/powerpc/mm/numa.c
> > +++ b/arch/powerpc/mm/numa.c
> > @@ -637,7 +637,7 @@ static inline int __init read_usm_ranges(const u32 **usm)
> > */
> > static void __init parse_drconf_memory(struct device_node *memory)
> > {
> > - const u32 *dm, *usm;
> > + const u32 *dm = NULL, *usm;
>
> Woot bikeshed! I think that's what the uninitialized_var() macro is for.
Doesn't work here. Produces the same error.
Mikey
^ permalink raw reply [flat|nested] 4+ messages in thread* [PATCH] powerpc: fix uninitialised error in numa.c
2012-06-20 5:46 ` Michael Neuling
@ 2012-06-20 6:01 ` Michael Neuling
0 siblings, 0 replies; 4+ messages in thread
From: Michael Neuling @ 2012-06-20 6:01 UTC (permalink / raw)
To: benh, Jimi Xenidis; +Cc: linuxppc-dev
chroma_defconfig currently gives me this with gcc 4.6:
arch/powerpc/mm/numa.c:638:13: error: 'dm' may be used uninitialized in this function [-Werror=uninitialized]
It's a bogus warning/error since of_get_drconf_memory() only writes it
anyway.
Signed-off-by: Michael Neuling <mikey@neuling.org>
cc: stable@kernel.org
---
> > > static void __init parse_drconf_memory(struct device_node *memory)
> > > {
> > > - const u32 *dm, *usm;
> > > + const u32 *dm = NULL, *usm;
> >
> > Woot bikeshed! I think that's what the uninitialized_var() macro is for.
>
> Doesn't work here. Produces the same error.
My bad.. I was using it wrong
Still affects 3.4 and 3.3 stable.
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 5ca3a15..7c28589 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -637,7 +637,7 @@ static inline int __init read_usm_ranges(const u32 **usm)
*/
static void __init parse_drconf_memory(struct device_node *memory)
{
- const u32 *dm, *usm;
+ const u32 *uninitialized_var(dm), *usm;
unsigned int n, rc, ranges, is_kexec_kdump = 0;
unsigned long lmb_size, base, size, sz;
int nid;
^ permalink raw reply related [flat|nested] 4+ messages in thread
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2012-06-20 4:17 [PATCH] powerpc: fix uninitialised error in numa.c Michael Neuling
2012-06-20 5:38 ` Tony Breeds
2012-06-20 5:46 ` Michael Neuling
2012-06-20 6:01 ` Michael Neuling
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