![Masahiro Yamada](/assets/img/avatar_default.png)
Commit60a3cdd063
("x86: add optimized inlining") introduced CONFIG_OPTIMIZE_INLINING, but it has been available only for x86. The idea is obviously arch-agnostic. This commit moves the config entry from arch/x86/Kconfig.debug to lib/Kconfig.debug so that all architectures can benefit from it. This can make a huge difference in kernel image size especially when CONFIG_OPTIMIZE_FOR_SIZE is enabled. For example, I got 3.5% smaller arm64 kernel for v5.1-rc1. dec file 18983424 arch/arm64/boot/Image.before 18321920 arch/arm64/boot/Image.after This also slightly improves the "Kernel hacking" Kconfig menu ase61aca5158
("Merge branch 'kconfig-diet' from Dave Hansen') suggested; this config option would be a good fit in the "compiler option" menu. Link: http://lkml.kernel.org/r/20190423034959.13525-12-yamada.masahiro@socionext.com Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Borislav Petkov <bp@suse.de> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Boris Brezillon <bbrezillon@kernel.org> Cc: Brian Norris <computersforpeace@gmail.com> Cc: Christophe Leroy <christophe.leroy@c-s.fr> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Marek Vasut <marek.vasut@gmail.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mathieu Malaterre <malat@debian.org> Cc: Miquel Raynal <miquel.raynal@bootlin.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Richard Weinberger <richard@nod.at> Cc: Russell King <rmk+kernel@arm.linux.org.uk> Cc: Stefan Agner <stefan@agner.ch> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
218 lines
6.5 KiB
C
218 lines
6.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_COMPILER_TYPES_H
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#define __LINUX_COMPILER_TYPES_H
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#ifndef __ASSEMBLY__
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#ifdef __CHECKER__
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# define __user __attribute__((noderef, address_space(1)))
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# define __kernel __attribute__((address_space(0)))
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# define __safe __attribute__((safe))
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# define __force __attribute__((force))
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# define __nocast __attribute__((nocast))
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# define __iomem __attribute__((noderef, address_space(2)))
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# define __must_hold(x) __attribute__((context(x,1,1)))
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# define __acquires(x) __attribute__((context(x,0,1)))
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# define __releases(x) __attribute__((context(x,1,0)))
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# define __acquire(x) __context__(x,1)
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# define __release(x) __context__(x,-1)
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# define __cond_lock(x,c) ((c) ? ({ __acquire(x); 1; }) : 0)
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# define __percpu __attribute__((noderef, address_space(3)))
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# define __rcu __attribute__((noderef, address_space(4)))
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# define __private __attribute__((noderef))
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extern void __chk_user_ptr(const volatile void __user *);
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extern void __chk_io_ptr(const volatile void __iomem *);
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# define ACCESS_PRIVATE(p, member) (*((typeof((p)->member) __force *) &(p)->member))
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#else /* __CHECKER__ */
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# ifdef STRUCTLEAK_PLUGIN
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# define __user __attribute__((user))
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# else
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# define __user
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# endif
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# define __kernel
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# define __safe
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# define __force
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# define __nocast
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# define __iomem
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# define __chk_user_ptr(x) (void)0
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# define __chk_io_ptr(x) (void)0
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# define __builtin_warning(x, y...) (1)
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# define __must_hold(x)
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# define __acquires(x)
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# define __releases(x)
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# define __acquire(x) (void)0
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# define __release(x) (void)0
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# define __cond_lock(x,c) (c)
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# define __percpu
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# define __rcu
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# define __private
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# define ACCESS_PRIVATE(p, member) ((p)->member)
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#endif /* __CHECKER__ */
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/* Indirect macros required for expanded argument pasting, eg. __LINE__. */
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#define ___PASTE(a,b) a##b
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#define __PASTE(a,b) ___PASTE(a,b)
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#ifdef __KERNEL__
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/* Attributes */
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#include <linux/compiler_attributes.h>
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/* Compiler specific macros. */
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#ifdef __clang__
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#include <linux/compiler-clang.h>
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#elif defined(__INTEL_COMPILER)
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#include <linux/compiler-intel.h>
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#elif defined(__GNUC__)
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/* The above compilers also define __GNUC__, so order is important here. */
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#include <linux/compiler-gcc.h>
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#else
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#error "Unknown compiler"
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#endif
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/*
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* Some architectures need to provide custom definitions of macros provided
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* by linux/compiler-*.h, and can do so using asm/compiler.h. We include that
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* conditionally rather than using an asm-generic wrapper in order to avoid
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* build failures if any C compilation, which will include this file via an
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* -include argument in c_flags, occurs prior to the asm-generic wrappers being
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* generated.
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*/
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#ifdef CONFIG_HAVE_ARCH_COMPILER_H
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#include <asm/compiler.h>
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#endif
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struct ftrace_branch_data {
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const char *func;
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const char *file;
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unsigned line;
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union {
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struct {
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unsigned long correct;
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unsigned long incorrect;
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};
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struct {
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unsigned long miss;
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unsigned long hit;
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};
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unsigned long miss_hit[2];
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};
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};
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struct ftrace_likely_data {
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struct ftrace_branch_data data;
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unsigned long constant;
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};
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#ifdef CONFIG_ENABLE_MUST_CHECK
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#define __must_check __attribute__((__warn_unused_result__))
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#else
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#define __must_check
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#endif
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#if defined(CC_USING_HOTPATCH)
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#define notrace __attribute__((hotpatch(0, 0)))
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#else
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#define notrace __attribute__((__no_instrument_function__))
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#endif
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/*
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* it doesn't make sense on ARM (currently the only user of __naked)
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* to trace naked functions because then mcount is called without
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* stack and frame pointer being set up and there is no chance to
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* restore the lr register to the value before mcount was called.
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*/
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#define __naked __attribute__((__naked__)) notrace
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#define __compiler_offsetof(a, b) __builtin_offsetof(a, b)
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/*
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* Force always-inline if the user requests it so via the .config.
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* GCC does not warn about unused static inline functions for
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* -Wunused-function. This turns out to avoid the need for complex #ifdef
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* directives. Suppress the warning in clang as well by using "unused"
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* function attribute, which is redundant but not harmful for gcc.
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* Prefer gnu_inline, so that extern inline functions do not emit an
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* externally visible function. This makes extern inline behave as per gnu89
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* semantics rather than c99. This prevents multiple symbol definition errors
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* of extern inline functions at link time.
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* A lot of inline functions can cause havoc with function tracing.
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* Do not use __always_inline here, since currently it expands to inline again
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* (which would break users of __always_inline).
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*/
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#if !defined(CONFIG_OPTIMIZE_INLINING)
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#define inline inline __attribute__((__always_inline__)) __gnu_inline \
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__maybe_unused notrace
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#else
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#define inline inline __gnu_inline \
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__maybe_unused notrace
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#endif
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#define __inline__ inline
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#define __inline inline
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/*
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* Rather then using noinline to prevent stack consumption, use
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* noinline_for_stack instead. For documentation reasons.
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*/
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#define noinline_for_stack noinline
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#endif /* __KERNEL__ */
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#endif /* __ASSEMBLY__ */
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/*
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* The below symbols may be defined for one or more, but not ALL, of the above
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* compilers. We don't consider that to be an error, so set them to nothing.
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* For example, some of them are for compiler specific plugins.
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*/
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#ifndef __latent_entropy
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# define __latent_entropy
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#endif
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#ifndef __randomize_layout
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# define __randomize_layout __designated_init
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#endif
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#ifndef __no_randomize_layout
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# define __no_randomize_layout
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#endif
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#ifndef randomized_struct_fields_start
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# define randomized_struct_fields_start
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# define randomized_struct_fields_end
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#endif
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#ifndef asm_volatile_goto
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#define asm_volatile_goto(x...) asm goto(x)
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#endif
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/* Are two types/vars the same type (ignoring qualifiers)? */
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#define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
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/* Is this type a native word size -- useful for atomic operations */
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#define __native_word(t) \
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(sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \
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sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))
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/* Helpers for emitting diagnostics in pragmas. */
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#ifndef __diag
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#define __diag(string)
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#endif
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#ifndef __diag_GCC
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#define __diag_GCC(version, severity, string)
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#endif
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#define __diag_push() __diag(push)
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#define __diag_pop() __diag(pop)
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#define __diag_ignore(compiler, version, option, comment) \
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__diag_ ## compiler(version, ignore, option)
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#define __diag_warn(compiler, version, option, comment) \
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__diag_ ## compiler(version, warn, option)
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#define __diag_error(compiler, version, option, comment) \
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__diag_ ## compiler(version, error, option)
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#endif /* __LINUX_COMPILER_TYPES_H */
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