kbuild: include core debug info when DEBUG_INFO_REDUCED (50ab9a69) · Commits · 戴 / test

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>

lib/Makefile

+3 −0

Original line number	Diff line number	Diff line
		@@ -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

lib/debug_info.c

0 → 100644

+27 −0

Original line number	Diff line number	Diff line
		/*
		* 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>

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