| Message ID | 20190423034959.13525-3-yamada.masahiro@socionext.com |
|---|---|
| State | New |
| Headers | show |
| Series | compiler: allow all arches to enable CONFIG_OPTIMIZE_INLINING | expand |
[adding relevant arm64 folk to Cc] On Tue, Apr 23, 2019 at 12:49:50PM +0900, Masahiro Yamada wrote: > This prepares to move CONFIG_OPTIMIZE_INLINING from x86 to a common > place. We need to eliminate potential issues beforehand. > > If it is enabled for arm64, the following errors are reported: > > In file included from ././include/linux/compiler_types.h:68, > from <command-line>: > ./arch/arm64/include/asm/jump_label.h: In function 'cpus_have_const_cap': > ./include/linux/compiler-gcc.h:120:38: warning: asm operand 0 probably doesn't match constraints > #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) > ^~~ > ./arch/arm64/include/asm/jump_label.h:32:2: note: in expansion of macro 'asm_volatile_goto' > asm_volatile_goto( > ^~~~~~~~~~~~~~~~~ > ./include/linux/compiler-gcc.h:120:38: error: impossible constraint in 'asm' > #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) > ^~~ > ./arch/arm64/include/asm/jump_label.h:32:2: note: in expansion of macro 'asm_volatile_goto' > asm_volatile_goto( > ^~~~~~~~~~~~~~~~~ > > Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> This looks sound to me, and from a quick scan of v5.1-rc6 with: $ git grep -wW inline -- arch/arm64 ... I didn't spot any other sites which obviously needed to be made __always_inline. I've built and booted this atop of defconfig and my usual suite of debug options for fuzzing, at EL1 under QEMU/KVM, and at EL2 under QEMU/TCG, with no issues in either case, so FWIW: Tested-by: Mark Rutland <mark.rutland@arm.com> Thanks, Mark. > --- > > Changes in v3: None > Changes in v2: > - split into a separate patch > > arch/arm64/include/asm/cpufeature.h | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h > index e505e1fbd2b9..77d1aa57323e 100644 > --- a/arch/arm64/include/asm/cpufeature.h > +++ b/arch/arm64/include/asm/cpufeature.h > @@ -406,7 +406,7 @@ static inline bool cpu_have_feature(unsigned int num) > } > > /* System capability check for constant caps */ > -static inline bool __cpus_have_const_cap(int num) > +static __always_inline bool __cpus_have_const_cap(int num) > { > if (num >= ARM64_NCAPS) > return false; > @@ -420,7 +420,7 @@ static inline bool cpus_have_cap(unsigned int num) > return test_bit(num, cpu_hwcaps); > } > > -static inline bool cpus_have_const_cap(int num) > +static __always_inline bool cpus_have_const_cap(int num) > { > if (static_branch_likely(&arm64_const_caps_ready)) > return __cpus_have_const_cap(num); > -- > 2.17.1 >
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index e505e1fbd2b9..77d1aa57323e 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -406,7 +406,7 @@ static inline bool cpu_have_feature(unsigned int num) } /* System capability check for constant caps */ -static inline bool __cpus_have_const_cap(int num) +static __always_inline bool __cpus_have_const_cap(int num) { if (num >= ARM64_NCAPS) return false; @@ -420,7 +420,7 @@ static inline bool cpus_have_cap(unsigned int num) return test_bit(num, cpu_hwcaps); } -static inline bool cpus_have_const_cap(int num) +static __always_inline bool cpus_have_const_cap(int num) { if (static_branch_likely(&arm64_const_caps_ready)) return __cpus_have_const_cap(num);
This prepares to move CONFIG_OPTIMIZE_INLINING from x86 to a common place. We need to eliminate potential issues beforehand. If it is enabled for arm64, the following errors are reported: In file included from ././include/linux/compiler_types.h:68, from <command-line>: ./arch/arm64/include/asm/jump_label.h: In function 'cpus_have_const_cap': ./include/linux/compiler-gcc.h:120:38: warning: asm operand 0 probably doesn't match constraints #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) ^~~ ./arch/arm64/include/asm/jump_label.h:32:2: note: in expansion of macro 'asm_volatile_goto' asm_volatile_goto( ^~~~~~~~~~~~~~~~~ ./include/linux/compiler-gcc.h:120:38: error: impossible constraint in 'asm' #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) ^~~ ./arch/arm64/include/asm/jump_label.h:32:2: note: in expansion of macro 'asm_volatile_goto' asm_volatile_goto( ^~~~~~~~~~~~~~~~~ Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> --- Changes in v3: None Changes in v2: - split into a separate patch arch/arm64/include/asm/cpufeature.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) -- 2.17.1