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SubjectRe: depmod gets stuck in symlink cycle in arch/arm/boot/dts/include
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Hi, Omar!

>>>>> On Fri, 12 May 2017 15:23:07 -0700, Omar Sandoval wrote:

> Hi,
> Linux kernel commit 4027494ae6e3 ("ARM: dts: add arm/arm64 include
> symlinks") introduced a couple of symlink cycles:

> $ ls -al arch/arm{,64}/boot/dts/include
> arch/arm64/boot/dts/include:
> total 12
> drwxr-xr-x 1 osandov users 38 May 11 14:01 .
> drwxr-xr-x 1 osandov users 320 Jan 25 20:44 ..
> lrwxrwxrwx 1 osandov users 24 May 11 14:01 arm -> ../../../../arm/boot/dts
> lrwxrwxrwx 1 osandov users 2 May 11 14:01 arm64 -> ..
> lrwxrwxrwx 1 osandov users 34 Nov 23 12:07 dt-bindings ->
> ../../../../../include/dt-bindings

> arch/arm/boot/dts/include:
> total 12
> drwxr-xr-x 1 osandov users 38 May 11 14:01 .
> drwxr-xr-x 1 osandov users 63102 May 11 14:01 ..
> lrwxrwxrwx 1 osandov users 2 May 11 14:01 arm -> ..
> lrwxrwxrwx 1 osandov users 26 May 11 14:01 arm64 -> ../../../../arm64/boot/dts
> lrwxrwxrwx 1 osandov users 34 Nov 23 12:07 dt-bindings ->
> ../../../../../include/dt-bindings

> On my system, /lib/modules/$(uname -r)/kernel is a symlink to
> /lib/modules/$(uname -r)/build, which is my built linux.git. depmod
> doesn't like these symlink cycles and ends up in an infinite loop.

> Maybe I shouldn't be symlinking kernel to build like this, but depmod
> shouldn't be getting stuck like this either. I wonder if anything else
> is going to barf on these symlink cycles, too.

depmod checks for special names "build" and "source" to skip them.

I wonder if it worth to implement full symlink loop check.

--
WBR,
Yauheni Kaliuta

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