From: Nick Desaulniers <ndesaulniers@google.com> To: mpe@ellerman.id.au Cc: christophe.leroy@c-s.fr, segher@kernel.crashing.org, arnd@arndb.de, Nick Desaulniers <ndesaulniers@google.com>, Nathan Chancellor <natechancellor@gmail.com>, kbuild test robot <lkp@intel.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com Subject: [PATCH] powerpc: fix inline asm constraints for dcbz Date: Fri, 9 Aug 2019 11:21:05 -0700 [thread overview] Message-ID: <20190809182106.62130-1-ndesaulniers@google.com> (raw) In-Reply-To: <87h873zs88.fsf@concordia.ellerman.id.au> The input parameter is modified, so it should be an output parameter with "=" to make it so that a copy of the input is not made by Clang. Link: https://bugs.llvm.org/show_bug.cgi?id=42762 Link: https://gcc.gnu.org/onlinedocs/gcc/Modifiers.html#Modifiers Link: https://github.com/ClangBuiltLinux/linux/issues/593 Link: https://godbolt.org/z/QwhZXi Link: https://lore.kernel.org/lkml/20190721075846.GA97701@archlinux-threadripper/ Fixes: 6c5875843b87 ("powerpc: slightly improve cache helpers") Debugged-by: Nathan Chancellor <natechancellor@gmail.com> Reported-by: Nathan Chancellor <natechancellor@gmail.com> Reported-by: kbuild test robot <lkp@intel.com> Suggested-by: Arnd Bergmann <arnd@arndb.de> Suggested-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> --- Green CI run: https://travis-ci.com/ClangBuiltLinux/continuous-integration/builds/122521976 https://github.com/ClangBuiltLinux/continuous-integration/pull/197/files#diff-40bd16e3188587e4d648c30e0c2d6d37 arch/powerpc/include/asm/cache.h | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/include/asm/cache.h b/arch/powerpc/include/asm/cache.h index b3388d95f451..5a0df6a1b9dc 100644 --- a/arch/powerpc/include/asm/cache.h +++ b/arch/powerpc/include/asm/cache.h @@ -107,22 +107,22 @@ extern void _set_L3CR(unsigned long); static inline void dcbz(void *addr) { - __asm__ __volatile__ ("dcbz %y0" : : "Z"(*(u8 *)addr) : "memory"); + __asm__ __volatile__ ("dcbz %y0" : "=Z"(*(u8 *)addr) :: "memory"); } static inline void dcbi(void *addr) { - __asm__ __volatile__ ("dcbi %y0" : : "Z"(*(u8 *)addr) : "memory"); + __asm__ __volatile__ ("dcbi %y0" : "=Z"(*(u8 *)addr) :: "memory"); } static inline void dcbf(void *addr) { - __asm__ __volatile__ ("dcbf %y0" : : "Z"(*(u8 *)addr) : "memory"); + __asm__ __volatile__ ("dcbf %y0" : "=Z"(*(u8 *)addr) :: "memory"); } static inline void dcbst(void *addr) { - __asm__ __volatile__ ("dcbst %y0" : : "Z"(*(u8 *)addr) : "memory"); + __asm__ __volatile__ ("dcbst %y0" : "=Z"(*(u8 *)addr) :: "memory"); } #endif /* !__ASSEMBLY__ */ #endif /* __KERNEL__ */ -- 2.23.0.rc1.153.gdeed80330f-goog
WARNING: multiple messages have this Message-ID (diff)
From: Nick Desaulniers <ndesaulniers@google.com> To: mpe@ellerman.id.au Cc: arnd@arndb.de, Nick Desaulniers <ndesaulniers@google.com>, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Paul Mackerras <paulus@samba.org>, Nathan Chancellor <natechancellor@gmail.com>, linuxppc-dev@lists.ozlabs.org, kbuild test robot <lkp@intel.com> Subject: [PATCH] powerpc: fix inline asm constraints for dcbz Date: Fri, 9 Aug 2019 11:21:05 -0700 [thread overview] Message-ID: <20190809182106.62130-1-ndesaulniers@google.com> (raw) In-Reply-To: <87h873zs88.fsf@concordia.ellerman.id.au> The input parameter is modified, so it should be an output parameter with "=" to make it so that a copy of the input is not made by Clang. Link: https://bugs.llvm.org/show_bug.cgi?id=42762 Link: https://gcc.gnu.org/onlinedocs/gcc/Modifiers.html#Modifiers Link: https://github.com/ClangBuiltLinux/linux/issues/593 Link: https://godbolt.org/z/QwhZXi Link: https://lore.kernel.org/lkml/20190721075846.GA97701@archlinux-threadripper/ Fixes: 6c5875843b87 ("powerpc: slightly improve cache helpers") Debugged-by: Nathan Chancellor <natechancellor@gmail.com> Reported-by: Nathan Chancellor <natechancellor@gmail.com> Reported-by: kbuild test robot <lkp@intel.com> Suggested-by: Arnd Bergmann <arnd@arndb.de> Suggested-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> --- Green CI run: https://travis-ci.com/ClangBuiltLinux/continuous-integration/builds/122521976 https://github.com/ClangBuiltLinux/continuous-integration/pull/197/files#diff-40bd16e3188587e4d648c30e0c2d6d37 arch/powerpc/include/asm/cache.h | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/include/asm/cache.h b/arch/powerpc/include/asm/cache.h index b3388d95f451..5a0df6a1b9dc 100644 --- a/arch/powerpc/include/asm/cache.h +++ b/arch/powerpc/include/asm/cache.h @@ -107,22 +107,22 @@ extern void _set_L3CR(unsigned long); static inline void dcbz(void *addr) { - __asm__ __volatile__ ("dcbz %y0" : : "Z"(*(u8 *)addr) : "memory"); + __asm__ __volatile__ ("dcbz %y0" : "=Z"(*(u8 *)addr) :: "memory"); } static inline void dcbi(void *addr) { - __asm__ __volatile__ ("dcbi %y0" : : "Z"(*(u8 *)addr) : "memory"); + __asm__ __volatile__ ("dcbi %y0" : "=Z"(*(u8 *)addr) :: "memory"); } static inline void dcbf(void *addr) { - __asm__ __volatile__ ("dcbf %y0" : : "Z"(*(u8 *)addr) : "memory"); + __asm__ __volatile__ ("dcbf %y0" : "=Z"(*(u8 *)addr) :: "memory"); } static inline void dcbst(void *addr) { - __asm__ __volatile__ ("dcbst %y0" : : "Z"(*(u8 *)addr) : "memory"); + __asm__ __volatile__ ("dcbst %y0" : "=Z"(*(u8 *)addr) :: "memory"); } #endif /* !__ASSEMBLY__ */ #endif /* __KERNEL__ */ -- 2.23.0.rc1.153.gdeed80330f-goog
next prev parent reply other threads:[~2019-08-09 18:21 UTC|newest] Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-07-29 20:25 [PATCH] powerpc: workaround clang codegen bug in dcbz Nick Desaulniers 2019-07-29 20:25 ` Nick Desaulniers 2019-07-29 20:32 ` Nathan Chancellor 2019-07-29 20:32 ` Nathan Chancellor 2019-07-29 20:45 ` Nick Desaulniers 2019-07-29 20:45 ` Nick Desaulniers 2019-07-29 20:47 ` Nathan Chancellor 2019-07-29 20:47 ` Nathan Chancellor 2019-07-29 20:49 ` Nick Desaulniers 2019-07-29 20:49 ` Nick Desaulniers 2019-07-29 21:52 ` Segher Boessenkool 2019-07-29 21:52 ` Segher Boessenkool 2019-07-30 7:34 ` Arnd Bergmann 2019-07-30 7:34 ` Arnd Bergmann 2019-07-30 11:17 ` Michael Ellerman 2019-07-30 11:17 ` Michael Ellerman 2019-08-09 18:21 ` Nick Desaulniers [this message] 2019-08-09 18:21 ` [PATCH] powerpc: fix inline asm constraints for dcbz Nick Desaulniers 2019-08-09 18:28 ` Arnd Bergmann 2019-08-09 18:28 ` Arnd Bergmann 2019-08-09 20:03 ` Christophe Leroy 2019-08-09 20:03 ` Christophe Leroy 2019-08-09 20:12 ` Arnd Bergmann 2019-08-09 20:12 ` Arnd Bergmann 2019-08-09 22:03 ` Nick Desaulniers 2019-08-09 22:03 ` Nick Desaulniers 2019-08-09 22:10 ` Segher Boessenkool 2019-08-09 22:10 ` Segher Boessenkool 2019-08-09 22:00 ` Segher Boessenkool 2019-08-09 22:00 ` Segher Boessenkool 2019-08-09 22:03 ` [PATCH v3] Revert "powerpc: slightly improve cache helpers" Nick Desaulniers 2019-08-09 22:03 ` Nick Desaulniers 2019-08-10 9:09 ` Michael Ellerman 2019-08-10 9:09 ` Michael Ellerman 2019-08-09 21:55 ` [PATCH] powerpc: fix inline asm constraints for dcbz Segher Boessenkool 2019-08-09 21:55 ` Segher Boessenkool 2019-08-09 20:36 ` Nathan Chancellor 2019-08-09 20:36 ` Nathan Chancellor 2019-07-30 13:48 ` [PATCH] powerpc: workaround clang codegen bug in dcbz Segher Boessenkool 2019-07-30 13:48 ` Segher Boessenkool 2019-07-30 14:30 ` Arnd Bergmann 2019-07-30 14:30 ` Arnd Bergmann 2019-07-30 16:16 ` Segher Boessenkool 2019-07-30 16:16 ` Segher Boessenkool 2019-07-30 17:07 ` Segher Boessenkool 2019-07-30 18:24 ` Arnd Bergmann 2019-07-30 18:24 ` Arnd Bergmann 2019-07-30 18:24 ` Arnd Bergmann 2019-07-30 19:35 ` Segher Boessenkool 2019-07-30 19:35 ` Segher Boessenkool 2019-07-30 5:31 ` Christophe Leroy 2019-07-30 5:31 ` Christophe Leroy
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20190809182106.62130-1-ndesaulniers@google.com \ --to=ndesaulniers@google.com \ --cc=arnd@arndb.de \ --cc=benh@kernel.crashing.org \ --cc=christophe.leroy@c-s.fr \ --cc=clang-built-linux@googlegroups.com \ --cc=linux-kernel@vger.kernel.org \ --cc=linuxppc-dev@lists.ozlabs.org \ --cc=lkp@intel.com \ --cc=mpe@ellerman.id.au \ --cc=natechancellor@gmail.com \ --cc=paulus@samba.org \ --cc=segher@kernel.crashing.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.