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| author | Rasmus Villemoes <linux@rasmusvillemoes.dk> | 2015-03-21 02:50:01 +0100 |
|---|---|---|
| committer | Michal Marek <mmarek@suse.cz> | 2015-06-11 15:08:32 +0200 |
| commit | 50ab9a69275dca588cb5ad5038657f069bbdeb56 (patch) | |
| tree | efbc69d993a916f8a38dd8d61bcc75eca4edcc97 | |
| parent | scripts: link-vmlinux: Don't pass page offset to kallsyms if XIP Kernel (diff) | |
| download | linux-50ab9a69275dca588cb5ad5038657f069bbdeb56.tar.xz linux-50ab9a69275dca588cb5ad5038657f069bbdeb56.zip | |
kbuild: include core debug info when DEBUG_INFO_REDUCED
With CONFIG_DEBUG_INFO_REDUCED, we do get quite a lot of debug info
(around 22.7 MB for a defconfig+DEBUG_INFO_REDUCED). However, the
"basenames must match" rule used by -femit-struct-debug-baseonly
option means that we miss some core data structures, such as struct
{device, file, inode, mm_struct, page} etc.
We can easily get these included as well, while still getting the
benefits of CONFIG_DEBUG_INFO_REDUCED (faster build times and smaller
individual object files): All it takes is a dummy translation unit
including a few strategic headers and compiled with a flag overriding
-femit-struct-debug-baseonly.
This increases the size of .debug_info by ~0.3%, but these 90 KB
contain some rather useful info.
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Michal Marek <mmarek@suse.cz>
| -rw-r--r-- | lib/Makefile | 3 | ||||
| -rw-r--r-- | lib/debug_info.c | 27 |
2 files changed, 30 insertions, 0 deletions
diff --git a/lib/Makefile b/lib/Makefile index 6c37933336a0..c918538110ed 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -45,6 +45,9 @@ CFLAGS_kobject.o += -DDEBUG CFLAGS_kobject_uevent.o += -DDEBUG endif +obj-$(CONFIG_DEBUG_INFO_REDUCED) += debug_info.o +CFLAGS_debug_info.o += $(call cc-option, -femit-struct-debug-detailed=any) + obj-$(CONFIG_GENERIC_IOMAP) += iomap.o obj-$(CONFIG_GENERIC_PCI_IOMAP) += pci_iomap.o obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o diff --git a/lib/debug_info.c b/lib/debug_info.c new file mode 100644 index 000000000000..2edbe27517ed --- /dev/null +++ b/lib/debug_info.c @@ -0,0 +1,27 @@ +/* + * This file exists solely to ensure debug information for some core + * data structures is included in the final image even for + * CONFIG_DEBUG_INFO_REDUCED. Please do not add actual code. However, + * adding appropriate #includes is fine. + */ +#include <stdarg.h> + +#include <linux/cred.h> +#include <linux/crypto.h> +#include <linux/dcache.h> +#include <linux/device.h> +#include <linux/fs.h> +#include <linux/fscache-cache.h> +#include <linux/io.h> +#include <linux/kallsyms.h> +#include <linux/kernel.h> +#include <linux/kobject.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/net.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <net/addrconf.h> +#include <net/sock.h> +#include <net/tcp.h> |