Commit 8b3165e5 authored Dec 03, 2020 by Xingxing Su Committed by Thomas Bogendoerfer Dec 04, 2020

MIPS: Enable GCOV



Enable gcov profiling of the entire kernel on mips. Required changes
include disabling profiling for:

* arch/kernel/boot/compressed: not linked to main kernel.

Lightly tested on Loongson 3A3000 an 3A4000, seems to work as expected.

without "GCOV_PROFILE := n" in compressed Makefile,
build errors as follows:
...
ld: arch/mips/boot/compressed/string.o:(.data+0x88):
 undefined reference to `__gcov_merge_add'
ld: arch/mips/boot/compressed/string.o:
 in function `_GLOBAL__sub_I_00100_0_memcpy':
string.c:(.text.startup+0x4): undefined reference to `__gcov_init'
ld: arch/mips/boot/compressed/string.o:
 in function `_GLOBAL__sub_D_00100_1_memcpy':
string.c:(.text.exit+0x0): undefined reference to `__gcov_exit'
...

Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Xingxing Su <suxingxing@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

parent 79109a51

arch/mips/Kconfig

+1 −0

Original line number	Diff line number	Diff line
		@@ -9,6 +9,7 @@ config MIPS
		select ARCH_HAS_PTE_SPECIAL if !(32BIT && CPU_HAS_RIXI)
		select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
		select ARCH_HAS_UBSAN_SANITIZE_ALL
		select ARCH_HAS_GCOV_PROFILE_ALL
		select ARCH_SUPPORTS_UPROBES
		select ARCH_USE_BUILTIN_BSWAP
		select ARCH_USE_CMPXCHG_LOCKREF if 64BIT

arch/mips/boot/compressed/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -36,6 +36,7 @@ KBUILD_AFLAGS := $(KBUILD_AFLAGS) -D__ASSEMBLY__ \

		# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
		KCOV_INSTRUMENT := n
		GCOV_PROFILE := n

		# decompressor objects (linked with vmlinuz)
		vmlinuzobjs-y := $(obj)/head.o $(obj)/decompress.o $(obj)/string.o

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