Re: [PATCH] perf tools: Fix arm64 build by generating unistd_64.h

[Leo Yan <leo.yan@arm.com>]

On Thu, Apr 17, 2025 at 02:55:50PM +0100, James Clark wrote:
> Since pulling in the kernel changes in commit 22f72088ffe6 ("tools
> headers: Update the syscall table with the kernel sources"), arm64 is
> no longer using a generic syscall header and generates one from the
> syscall table. Therefore we must also generate the syscall header for
> arm64 before building Perf.
> 
> Add it as a dependency to libperf which uses one syscall number. Perf
> uses more, but as libperf is a dependency of Perf it will be generated
> for both.
> 
> Future platforms that need this will have to add their own syscall-y
> targets in libperf manually. Unfortunately the arch specific files that
> do this (e.g. arch/arm64/include/asm/Kbuild) can't easily be imported
> into the Perf build. But Perf only needs a subset of the generated files
> anyway, so redefining them is probably the correct thing to do.
> 
> Fixes: 22f72088ffe6 ("tools headers: Update the syscall table with the kernel sources")
> Signed-off-by: James Clark <james.clark@linaro.org>

Reviewed-by: Leo Yan <leo.yan@arm.com>