This introduces
CONFIG_DEVELKERNEL
If CONFIG_DEVELKERNEL is set then this is a development kernel.
Otherwise the kernel to be built is a a production kernel.
If CONFIG_DEVELKERNEL is set then the constant
DEVELKERNEL
is set to 1. Otherwise it is zero.
The following functions are defined in kernel.h for diagnostics
DEVEL_WARN_ON(condition)
Warn on the condition but only if this is a development kernel
DEVEL_WARN_ON_ONCE(condition)
Warn on the condition once but only if this is a development kernel
devel_printk(fmt, ...)
Output that should only be generated for a development kernel.
CONFIG_DEVELKERNEL is set and cleared by edit the Makefile. Line 7 contains
DEVELKERNEL = 1
Updates SLAB and SLUB to not perform the kmalloc(0) tests anymore
if the kernel is not a development kernel.
Editing DEVELKERNEL requires a
make clean
to correctly rebuild the kernel with the proper settings. This is similar
to editing the version number. Sam: Is there any way to avoid the make
clean?
Cc: Dave Jones <[email protected]>
Signed-off-by: Sam Ravnborg <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Christoph Lameter <[email protected]>
---
Makefile | 3 ++-
include/linux/kernel.h | 14 ++++++++++++++
include/linux/slub_def.h | 2 +-
mm/slab.c | 2 +-
mm/slub.c | 4 ++--
scripts/kconfig/symbol.c | 9 +++++++++
6 files changed, 29 insertions(+), 5 deletions(-)
Index: slub/Makefile
===================================================================
--- slub.orig/Makefile 2007-06-01 20:11:57.000000000 -0700
+++ slub/Makefile 2007-06-01 20:56:27.000000000 -0700
@@ -3,6 +3,7 @@ PATCHLEVEL = 6
SUBLEVEL = 22
EXTRAVERSION = -rc3-mm1
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
Index: slub/scripts/kconfig/symbol.c
===================================================================
--- slub.orig/scripts/kconfig/symbol.c 2007-06-01 20:13:24.000000000 -0700
+++ slub/scripts/kconfig/symbol.c 2007-06-01 21:07:52.000000000 -0700
@@ -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)
Index: slub/include/linux/kernel.h
===================================================================
--- slub.orig/include/linux/kernel.h 2007-06-01 20:19:17.000000000 -0700
+++ slub/include/linux/kernel.h 2007-06-01 20:30:16.000000000 -0700
@@ -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
Index: slub/include/linux/slub_def.h
===================================================================
--- slub.orig/include/linux/slub_def.h 2007-06-01 20:25:06.000000000 -0700
+++ slub/include/linux/slub_def.h 2007-06-01 20:28:02.000000000 -0700
@@ -80,7 +80,7 @@ static inline int kmalloc_index(size_t s
* allocate memory but return ZERO_SIZE_PTR.
* WARN so that people can review and fix their code.
*/
- WARN_ON_ONCE(size == 0);
+ DEVEL_WARN_ON_ONCE(size == 0);
if (!size)
return 0;
Index: slub/mm/slub.c
===================================================================
--- slub.orig/mm/slub.c 2007-06-01 20:24:26.000000000 -0700
+++ slub/mm/slub.c 2007-06-01 20:28:20.000000000 -0700
@@ -2525,8 +2525,8 @@ 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);
Index: slub/mm/slab.c
===================================================================
--- slub.orig/mm/slab.c 2007-06-01 20:29:39.000000000 -0700
+++ slub/mm/slab.c 2007-06-01 20:29:45.000000000 -0700
@@ -774,7 +774,7 @@ static inline struct kmem_cache *__find_
*/
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++;
-
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