From: Guo Xuenan guoxuenan@huawei.com
hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8PGC4
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This reverts commit 889b3c1245de48ed0cacf7aebb25c489d3e4a3e9.
Signed-off-by: Guo Xuenan guoxuenan@huawei.com Signed-off-by: Yuntao Liu liuyuntao12@huawei.com --- arch/x86/configs/i386_defconfig | 1 + arch/x86/configs/x86_64_defconfig | 1 + include/linux/compiler_types.h | 8 ++++++++ kernel/configs/tiny.config | 1 + lib/Kconfig.debug | 12 ++++++++++++ 5 files changed, 23 insertions(+)
diff --git a/arch/x86/configs/i386_defconfig b/arch/x86/configs/i386_defconfig index 1b411bbf3cb0..6a505b3b4b4d 100644 --- a/arch/x86/configs/i386_defconfig +++ b/arch/x86/configs/i386_defconfig @@ -280,5 +280,6 @@ CONFIG_BLK_DEV_IO_TRACE=y CONFIG_PROVIDE_OHCI1394_DMA_INIT=y CONFIG_EARLY_PRINTK_DBGP=y CONFIG_DEBUG_BOOT_PARAMS=y +CONFIG_OPTIMIZE_INLINING=y CONFIG_UNWINDER_FRAME_POINTER=y # CONFIG_64BIT is not set diff --git a/arch/x86/configs/x86_64_defconfig b/arch/x86/configs/x86_64_defconfig index 409e9182bd29..5bd1fcabbe7d 100644 --- a/arch/x86/configs/x86_64_defconfig +++ b/arch/x86/configs/x86_64_defconfig @@ -276,3 +276,4 @@ CONFIG_BLK_DEV_IO_TRACE=y CONFIG_PROVIDE_OHCI1394_DMA_INIT=y CONFIG_EARLY_PRINTK_DBGP=y CONFIG_DEBUG_BOOT_PARAMS=y +CONFIG_OPTIMIZE_INLINING=y diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h index c523c6683789..476c54a6fb12 100644 --- a/include/linux/compiler_types.h +++ b/include/linux/compiler_types.h @@ -206,13 +206,21 @@ struct ftrace_likely_data { #define __naked __attribute__((__naked__)) notrace
/* + * Force always-inline if the user requests it so via the .config. * Prefer gnu_inline, so that extern inline functions do not emit an * externally visible function. This makes extern inline behave as per gnu89 * semantics rather than c99. This prevents multiple symbol definition errors * of extern inline functions at link time. * A lot of inline functions can cause havoc with function tracing. + * Do not use __always_inline here, since currently it expands to inline again + * (which would break users of __always_inline). */ +#if !defined(CONFIG_OPTIMIZE_INLINING) +#define inline inline __attribute__((__always_inline__)) __gnu_inline \ + __inline_maybe_unused notrace +#else #define inline inline __gnu_inline __inline_maybe_unused notrace +#endif
/* * gcc provides both __inline__ and __inline as alternate spellings of diff --git a/kernel/configs/tiny.config b/kernel/configs/tiny.config index 00009f7d0835..d0655ba4df4c 100644 --- a/kernel/configs/tiny.config +++ b/kernel/configs/tiny.config @@ -6,5 +6,6 @@ CONFIG_CC_OPTIMIZE_FOR_SIZE=y CONFIG_KERNEL_XZ=y # CONFIG_KERNEL_LZO is not set # CONFIG_KERNEL_LZ4 is not set +CONFIG_OPTIMIZE_INLINING=y CONFIG_SLUB=y CONFIG_SLUB_TINY=y diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 7241c304cb5c..89582a93257a 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -474,6 +474,18 @@ config HEADERS_INSTALL user-space program samples. It is also needed by some features such as uapi header sanity checks.
+config OPTIMIZE_INLINING + def_bool y + help + This option determines if the kernel forces gcc to inline the functions + developers have marked 'inline'. Doing so takes away freedom from gcc to + do what it thinks is best, which is desirable for the gcc 3.x series of + compilers. The gcc 4.x series have a rewritten inlining algorithm and + enabling this option will generate a smaller kernel there. Hopefully + this algorithm is so good that allowing gcc 4.x and above to make the + decision will become the default in the future. Until then this option + is there to test gcc for this. + config DEBUG_SECTION_MISMATCH bool "Enable full Section mismatch analysis" depends on CC_IS_GCC