Re: [PATCH] arm64: vdso: remove commas between macro name and arguments

From: Ard Biesheuvel
Date: Fri Apr 16 2021 - 15:08:22 EST


On Fri, 16 Apr 2021 at 20:16, Jian Cai <jiancai@xxxxxxxxxx> wrote:
>
> LLVM's integrated assembler does not support using commas separating
> the name and arguments in .macro. However, only spaces are used in the
> manual page. This replaces commas between macro names and the subsequent
> arguments with space in calls to clock_gettime_return to make it
> compatible with IAS.
>
> Link:
> https://sourceware.org/binutils/docs/as/Macro.html#Macro
> Signed-off-by: Jian Cai <jiancai@xxxxxxxxxx>
> ---
> arch/arm64/kernel/vdso/gettimeofday.S | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/arch/arm64/kernel/vdso/gettimeofday.S b/arch/arm64/kernel/vdso/gettimeofday.S
> index 856fee6d3512..7ee685d9adfc 100644
> --- a/arch/arm64/kernel/vdso/gettimeofday.S
> +++ b/arch/arm64/kernel/vdso/gettimeofday.S
> @@ -122,7 +122,7 @@ x_tmp .req x8
> 9998:
> .endm
>
> - .macro clock_gettime_return, shift=0
> + .macro clock_gettime_return shift=0

Are you sure the definition needs to be changed as well? The majority
of GAS macros in arch/arm64 (if not all) use a comma after the
identifier, so I would prefer not to deviate from that arbitrarily.

Just look at

$ git grep -E \.macro\\s+\\S+, arch/arm64/*.S


> .if \shift == 1
> lsr x11, x11, x12
> .endif
> @@ -227,7 +227,7 @@ realtime:
> seqcnt_check fail=realtime
> get_ts_realtime res_sec=x10, res_nsec=x11, \
> clock_nsec=x15, xtime_sec=x13, xtime_nsec=x14, nsec_to_sec=x9
> - clock_gettime_return, shift=1
> + clock_gettime_return shift=1
>
> ALIGN
> monotonic:
> @@ -250,7 +250,7 @@ monotonic:
> clock_nsec=x15, xtime_sec=x13, xtime_nsec=x14, nsec_to_sec=x9
>
> add_ts sec=x10, nsec=x11, ts_sec=x3, ts_nsec=x4, nsec_to_sec=x9
> - clock_gettime_return, shift=1
> + clock_gettime_return shift=1
>
> ALIGN
> monotonic_raw:
> @@ -271,7 +271,7 @@ monotonic_raw:
> clock_nsec=x15, nsec_to_sec=x9
>
> add_ts sec=x10, nsec=x11, ts_sec=x13, ts_nsec=x14, nsec_to_sec=x9
> - clock_gettime_return, shift=1
> + clock_gettime_return shift=1
>
> ALIGN
> realtime_coarse:
> --
> 2.31.1.368.gbe11c130af-goog
>
>
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