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Date: Sun, 3 Jun 2007 10:17:48 +0200
From: Sam Ravnborg <sam@...nborg.org>
To: Christoph Lameter <clameter@....com>
Cc: Roman Zippel <zippel@...ux-m68k.org>, akpm@...ux-foundation.org,
linux-kernel@...r.kernel.org, Dave Jones <davej@...hat.com>
Subject: Re: Conditionals for development tests and output
On Sat, Jun 02, 2007 at 04:29:27PM -0700, Christoph Lameter wrote:
> On Sat, 2 Jun 2007, Sam Ravnborg wrote:
>
> > The below patch suffers from the problem that changing the
> > value of DEVELKERNEL in the Makefile are not automatically
> > reflected in autoconf.h.
>
> Well you are restating what is in the description. See below.
This turned out to be a simple dependency issue.
Added Makefile as prerequisite solved it as far as my testing showed.
Updated patch below.
The naming I do not like.
What about: KERNELHACKING (to make association with the Kernel hacking menu)?
Thats a claer signal that if you hack on the kernel you better set this.
Sam
diff --git a/Makefile b/Makefile
index 562a909..d1e1e6e 100644
--- a/Makefile
+++ b/Makefile
@@ -3,6 +3,7 @@ PATCHLEVEL = 6
SUBLEVEL = 22
EXTRAVERSION = -rc3
NAME = Jeff Thinks I Should Change This, But To What?
+DEVELKERNEL = 1
# *DOCUMENTATION*
# To see a list of typical targets execute "make help"
@@ -320,7 +321,7 @@ AFLAGS := -D__ASSEMBLY__
KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
-export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
+export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION DEVELKERNEL
export ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
@@ -453,7 +454,8 @@ $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
# with it and forgot to run make oldconfig.
# if auto.conf.cmd is missing then we are probably in a cleaned tree so
# we execute the config step to be sure to catch updated Kconfig files
-include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
+include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd Makefile
+ $(Q)echo " Kconfig - silentoldconfig"
$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
else
# external modules needs include/linux/autoconf.h and include/config/auto.conf
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 45353d7..cb98841 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -375,4 +375,18 @@ struct sysinfo {
#define NUMA_BUILD 0
#endif
+#ifdef CONFIG_DEVELKERNEL
+#define DEVELKERNEL 1
+#else
+#define DEVELKERNEL 0
+#endif
+
+#define DEVEL_WARN_ON(x) WARN_ON(DEVELKERNEL && (x))
+#define DEVEL_WARN_ON_ONCE(x) WARN_ON_ONCE(DEVELKERNEL && (x))
+
+#define devel_printk(fmt,arg...) ({ \
+ if (DEVELKERNEL) \
+ printk(fmt, ##arg); \
+})
+
#endif
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 0764c82..8c58d44 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -74,7 +74,7 @@ static inline int kmalloc_index(size_t size)
* We should return 0 if size == 0 but we use the smallest object
* here for SLAB legacy reasons.
*/
- WARN_ON_ONCE(size == 0);
+ DEVEL_WARN_ON_ONCE(size == 0);
if (size > KMALLOC_MAX_SIZE)
return -1;
diff --git a/mm/slab.c b/mm/slab.c
index 2e71a32..0b7aca9 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -774,7 +774,7 @@ static inline struct kmem_cache *__find_general_cachep(size_t size,
*/
BUG_ON(malloc_sizes[INDEX_AC].cs_cachep == NULL);
#endif
- WARN_ON_ONCE(size == 0);
+ DEVEL_WARN_ON_ONCE(size == 0);
while (size > csizep->cs_size)
csizep++;
diff --git a/mm/slub.c b/mm/slub.c
index 3e5aefc..4de2b24 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2464,8 +2464,8 @@ void __init kmem_cache_init(void)
kmem_size = offsetof(struct kmem_cache, cpu_slab) +
nr_cpu_ids * sizeof(struct page *);
- printk(KERN_INFO "SLUB: Genslabs=%d, HWalign=%d, Order=%d-%d, MinObjects=%d,"
- " Processors=%d, Nodes=%d\n",
+ devel_printk(KERN_INFO "SLUB: Genslabs=%d, HWalign=%d, Order=%d-%d, "
+ "MinObjects=%d, Processors=%d, Nodes=%d\n",
KMALLOC_SHIFT_HIGH, cache_line_size(),
slub_min_order, slub_max_order, slub_min_objects,
nr_cpu_ids, nr_node_ids);
diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
index c35dcc5..bf788ad 100644
--- a/scripts/kconfig/symbol.c
+++ b/scripts/kconfig/symbol.c
@@ -72,6 +72,15 @@ void sym_init(void)
sym->type = S_STRING;
sym->flags |= SYMBOL_AUTO;
sym_add_default(sym, uts.release);
+
+ sym = sym_lookup("DEVELKERNEL", 0);
+ sym->type = S_BOOLEAN;
+ sym->flags |= SYMBOL_VALID|SYMBOL_AUTO;
+ p = getenv("DEVELKERNEL");
+ if (p && atoi(p))
+ sym_add_default(sym, "y");
+ else
+ sym_add_default(sym, "n");
}
enum symbol_type sym_get_type(struct symbol *sym)
-
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