Re: [Buildroot] [PATCH v2] package/linux-tools: Fix parallel compilation

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

On Mon, 21 Apr 2025 23:36:59 -0700
Charlie Jenkins <charlie@rivosinc.com> wrote:

> linux-tools opportunistically set linux as only a patch dependency. This
> unfortunately introduces a race condition in the shared linux scripts
> when using PER_PACKAGE_DIRECTORIES and using top level parallelism. The
> race manifests as the error "/bin/sh: 1: scripts/basic/fixdep:
> Permission denied". This happens when the linux package and the
> linux-tools package are being compiled in parallel.
> 
> The linux-tools currently using fixdep are perf and rtla. When the
> timing is correct, perf, rtla, or the kernel Makefile will try to use
> fixdep while one of the others is compiling fixed, resulting in fixdep
> being briefly not available.
> 
> To fix this, set linux as a build dependency instead of a patch
> dependency.
> 
> Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
> Reviewed-by: Yann E. MORIN <yann.morin.1998@free.fr>
> ---
> While the timing of this seems like it should very rarely be triggered,
> on my build server I hit this issue nearly 100% of the time.
> ---
> Changes in v2:
> - Added more details to how/why the race occurs
> - Link to v1: https://lore.kernel.org/r/20250409-fix_linux_tools_parallel-v1-1-14135d77acf1@rivosinc.com
> ---
>  package/linux-tools/linux-tools.mk | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)

Nice commit message, thanks a lot! Applied.

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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