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Date: Thu, 26 Oct 2023 17:08:46 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
Ian Rogers <irogers@...gle.com>, linux-kernel@...r.kernel.org,
linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 1/5] perf tools: Add get_unaligned_leNN()
Em Thu, Oct 26, 2023 at 07:09:26PM +0300, Adrian Hunter escreveu:
> On 26/10/23 16:44, Arnaldo Carvalho de Melo wrote:
> > Em Thu, Oct 05, 2023 at 04:38:05PM -0300, Arnaldo Carvalho de Melo escreveu:
> >> Em Thu, Oct 05, 2023 at 10:04:47PM +0300, Adrian Hunter escreveu:
> >>> Add get_unaligned_le16(), get_unaligned_le32 and get_unaligned_le64, same
> >>> as include/asm-generic/unaligned.h.
> >>>
> >>> Use diagnostic pragmas to ignore -Wpacked used by perf build.
> >>
> >> Can we get the tools copy of include/asm-generic/unaligned.h closer and
> >> have it in check-headers.sh?
> >
> > And this is not building when cross building to mips, mips64 and mipsel
> > on debian:experimental:
> >
> > In file included from util/intel-pt-decoder/intel-pt-pkt-decoder.c:10:
> > /git/perf-6.6.0-rc1/tools/include/asm-generic/unaligned.h: In function 'get_unaligned_le16':
> > /git/perf-6.6.0-rc1/tools/include/asm-generic/unaligned.h:13:29: error: packed attribute causes inefficient alignment for 'x' [-Werror=attributes]
>
> So I guess another diagnostic pragma is needed, perhaps the following works?
>
> #pragma GCC diagnostic ignored "-Wattributes"
I'll try it.
- Arnaldo
>
> > 13 | const struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \
> > | ^
> > /git/perf-6.6.0-rc1/tools/include/asm-generic/unaligned.h:27:28: note: in expansion of macro '__get_unaligned_t'
> > 27 | return le16_to_cpu(__get_unaligned_t(__le16, p));
> > | ^~~~~~~~~~~~~~~~~
> > /git/perf-6.6.0-rc1/tools/include/asm-generic/unaligned.h: In function 'get_unaligned_le32':
> > /git/perf-6.6.0-rc1/tools/include/asm-generic/unaligned.h:13:29: error: packed attribute causes inefficient alignment for 'x' [-Werror=attributes]
> > 13 | const struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \
> > | ^
> > /git/perf-6.6.0-rc1/tools/include/asm-generic/unaligned.h:32:28: note: in expansion of macro '__get_unaligned_t'
> > 32 | return le32_to_cpu(__get_unaligned_t(__le32, p));
> > | ^~~~~~~~~~~~~~~~~
> >
> >
> > Ditto for some other distros when cross building on ubuntu:18.04
> >
> > MKDIR /tmp/build/perf/util/perf-regs-arch/
> > In file included from /usr/sparc64-linux-gnu/include/bits/byteswap.h:34:0,
> > from /usr/sparc64-linux-gnu/include/endian.h:60,
> > from util/intel-pt-decoder/intel-pt-pkt-decoder.c:9:
> > /git/perf-6.6.0-rc1/tools/include/asm-generic/unaligned.h: In function 'get_unaligned_le16':
> > /git/perf-6.6.0-rc1/tools/include/asm-generic/unaligned.h:13:22: error: packed attribute causes inefficient alignment for 'x' [-Werror=attributes]
> > const struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \
> > ^
> > /git/perf-6.6.0-rc1/tools/include/asm-generic/unaligned.h:27:21: note: in expansion of macro '__get_unaligned_t'
> > return le16_to_cpu(__get_unaligned_t(__le16, p));
> > ^~~~~~~~~~~~~~~~~
> >
> > 37 14.17 ubuntu:18.04-x-arm : FAIL gcc version 7.5.0 (Ubuntu/Linaro 7.5.0-3ubuntu1~18.04)
> > 38 13.56 ubuntu:18.04-x-arm64 : FAIL gcc version 7.5.0 (Ubuntu/Linaro 7.5.0-3ubuntu1~18.04)
> > 42 12.70 ubuntu:18.04-x-riscv64 : FAIL gcc version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)
> > 44 13.95 ubuntu:18.04-x-sh4 : FAIL gcc version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)
> > 45 13.08 ubuntu:18.04-x-sparc64 : FAIL gcc version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)
> >
> >> - Arnaldo
> >>
> >>> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> >>> ---
> >>> tools/include/asm-generic/unaligned.h | 20 ++++++++++++++++++++
> >>> 1 file changed, 20 insertions(+)
> >>>
> >>> diff --git a/tools/include/asm-generic/unaligned.h b/tools/include/asm-generic/unaligned.h
> >>> index 47387c607035..9140bb4e16c6 100644
> >>> --- a/tools/include/asm-generic/unaligned.h
> >>> +++ b/tools/include/asm-generic/unaligned.h
> >>> @@ -6,6 +6,9 @@
> >>> #ifndef __TOOLS_LINUX_ASM_GENERIC_UNALIGNED_H
> >>> #define __TOOLS_LINUX_ASM_GENERIC_UNALIGNED_H
> >>>
> >>> +#pragma GCC diagnostic push
> >>> +#pragma GCC diagnostic ignored "-Wpacked"
> >>> +
> >>> #define __get_unaligned_t(type, ptr) ({ \
> >>> const struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \
> >>> __pptr->x; \
> >>> @@ -19,5 +22,22 @@
> >>> #define get_unaligned(ptr) __get_unaligned_t(typeof(*(ptr)), (ptr))
> >>> #define put_unaligned(val, ptr) __put_unaligned_t(typeof(*(ptr)), (val), (ptr))
> >>>
> >>> +static inline u16 get_unaligned_le16(const void *p)
> >>> +{
> >>> + return le16_to_cpu(__get_unaligned_t(__le16, p));
> >>> +}
> >>> +
> >>> +static inline u32 get_unaligned_le32(const void *p)
> >>> +{
> >>> + return le32_to_cpu(__get_unaligned_t(__le32, p));
> >>> +}
> >>> +
> >>> +static inline u64 get_unaligned_le64(const void *p)
> >>> +{
> >>> + return le64_to_cpu(__get_unaligned_t(__le64, p));
> >>> +}
> >>> +
> >>> +#pragma GCC diagnostic pop
> >>> +
> >>> #endif /* __TOOLS_LINUX_ASM_GENERIC_UNALIGNED_H */
> >>>
> >>> --
> >>> 2.34.1
> >>>
> >>
> >> --
> >>
> >> - Arnaldo
> >
>
--
- Arnaldo
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