[Buildroot] [PATCH v2 1/1] package/util-linux: fix LSMT_ROOT fallback definition

[Buildroot] [PATCH v2 1/1] package/util-linux: fix LSMT_ROOT fallback definition

[Shubham Chakraborty]

The fallback definition for LSMT_ROOT was incorrectly guarded
with #ifdef instead of #ifndef, making it ineffective on systems
with older kernel headers that don't define this constant.

This caused build failures with "LSMT_ROOT undeclared" errors on
autobuilders using older kernel headers.

Fixes:
 - http://autobuild.buildroot.net/results/ac2/ac2bc633db0c605564c79bfdfa0e257a9b4f1b28/

Signed-off-by: Shubham Chakraborty <chakrabortyshubham66@gmail.com>

---
Changes v1 -> v2:
  - Add missing 'Upstream:' tag to patches (fixes check-package failure)
  - Use symlink for util-linux-libs patch to avoid duplication
---
 ...api-utils.h-fix-LSMT_ROOT-definition.patch | 27 +++++++++++++++++++
 ...api-utils.h-fix-LSMT_ROOT-definition.patch |  1 +
 2 files changed, 28 insertions(+)
 create mode 100644 package/util-linux/0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch
 create mode 120000 package/util-linux/util-linux-libs/0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch

diff --git a/package/util-linux/0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch b/package/util-linux/0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch
new file mode 100644
index 0000000000..3d0de62bfd
--- /dev/null
+++ b/package/util-linux/0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch
@@ -0,0 +1,27 @@
+From 72ff3b8998a675900fcb7c18c0e03f1552b13a8b Mon Sep 17 00:00:00 2001
+From: Shubham Chakraborty <chakrabortyshubham66@gmail.com>
+Date: Tue, 14 Apr 2026 11:04:08 +0530
+Subject: [PATCH] include/mount-api-utils.h: fix LSMT_ROOT definition
+
+Upstream: Pending
+Signed-off-by: Shubham Chakraborty <chakrabortyshubham66@gmail.com>
+---
+ include/mount-api-utils.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/include/mount-api-utils.h b/include/mount-api-utils.h
+index a916f99..87e173e 100644
+--- a/include/mount-api-utils.h
++++ b/include/mount-api-utils.h
+@@ -339,7 +339,7 @@ struct ul_statmount {
+ /*
+  * Special @mnt_id values that can be passed to listmount
+  */
+-#ifdef LSMT_ROOT
++#ifndef LSMT_ROOT
+ # define LSMT_ROOT              0xffffffffffffffff    /* root mount */
+ #endif
+ 
+-- 
+2.53.0
+
diff --git a/package/util-linux/util-linux-libs/0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch b/package/util-linux/util-linux-libs/0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch
new file mode 120000
index 0000000000..88f6b841f7
--- /dev/null
+++ b/package/util-linux/util-linux-libs/0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch
@@ -0,0 +1 @@
+../0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch
\ No newline at end of file
-- 
2.53.0

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Re: [Buildroot] [PATCH v2 1/1] package/util-linux: fix LSMT_ROOT fallback definition

[Thomas Petazzoni via buildroot]

Hello,

On Fri, Apr 17, 2026 at 11:35:53AM +0530, Shubham Chakraborty wrote:
> The fallback definition for LSMT_ROOT was incorrectly guarded
> with #ifdef instead of #ifndef, making it ineffective on systems
> with older kernel headers that don't define this constant.
> 
> This caused build failures with "LSMT_ROOT undeclared" errors on
> autobuilders using older kernel headers.

This explanation wasn't really complete: my builds with old kernel
headers were building fine. A critical piece of information is that
the issue only happened with musl, because it added the SYS_statmount
definition between musl 1.2.5 and 1.2.6, so since musl 1.2.6,
util-linux believes statmount() is available, uses it, but if you have
old kernel headers that don't provide LSMT_ROOT, the build fails.

> diff --git a/package/util-linux/0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch b/package/util-linux/0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch
> new file mode 100644
> index 0000000000..3d0de62bfd
> --- /dev/null
> +++ b/package/util-linux/0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch
> @@ -0,0 +1,27 @@
> +From 72ff3b8998a675900fcb7c18c0e03f1552b13a8b Mon Sep 17 00:00:00 2001
> +From: Shubham Chakraborty <chakrabortyshubham66@gmail.com>
> +Date: Tue, 14 Apr 2026 11:04:08 +0530
> +Subject: [PATCH] include/mount-api-utils.h: fix LSMT_ROOT definition
> +
> +Upstream: Pending

This is not useful in Buildroot. You have to provide an actual link
showing where it was submitted.

So I did submit the patch upstream:

  https://lore.kernel.org/util-linux/20260530094932.2351791-1-thomas.petazzoni@bootlin.com/T/#u

with an improved commit message, included this improved patch in
Buildroot, and applied.

Thanks!

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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Re: [Buildroot] [PATCH v2 1/1] package/util-linux: fix LSMT_ROOT fallback definition

[Thomas Perale via buildroot]

In reply of:
> The fallback definition for LSMT_ROOT was incorrectly guarded
> with #ifdef instead of #ifndef, making it ineffective on systems
> with older kernel headers that don't define this constant.
> 
> This caused build failures with "LSMT_ROOT undeclared" errors on
> autobuilders using older kernel headers.
> 
> Fixes:
>  - http://autobuild.buildroot.net/results/ac2/ac2bc633db0c605564c79bfdfa0e257a9b4f1b28/
> 
> Signed-off-by: Shubham Chakraborty <chakrabortyshubham66@gmail.com>
> 

Applied to 2026.02.x. Thanks

> ---
> Changes v1 -> v2:
>   - Add missing 'Upstream:' tag to patches (fixes check-package failure)
>   - Use symlink for util-linux-libs patch to avoid duplication
> ---
>  ...api-utils.h-fix-LSMT_ROOT-definition.patch | 27 +++++++++++++++++++
>  ...api-utils.h-fix-LSMT_ROOT-definition.patch |  1 +
>  2 files changed, 28 insertions(+)
>  create mode 100644 package/util-linux/0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch
>  create mode 120000 package/util-linux/util-linux-libs/0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch
> 
> diff --git a/package/util-linux/0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch b/package/util-linux/0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch
> new file mode 100644
> index 0000000000..3d0de62bfd
> --- /dev/null
> +++ b/package/util-linux/0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch
> @@ -0,0 +1,27 @@
> +From 72ff3b8998a675900fcb7c18c0e03f1552b13a8b Mon Sep 17 00:00:00 2001
> +From: Shubham Chakraborty <chakrabortyshubham66@gmail.com>
> +Date: Tue, 14 Apr 2026 11:04:08 +0530
> +Subject: [PATCH] include/mount-api-utils.h: fix LSMT_ROOT definition
> +
> +Upstream: Pending
> +Signed-off-by: Shubham Chakraborty <chakrabortyshubham66@gmail.com>
> +---
> + include/mount-api-utils.h | 2 +-
> + 1 file changed, 1 insertion(+), 1 deletion(-)
> +
> +diff --git a/include/mount-api-utils.h b/include/mount-api-utils.h
> +index a916f99..87e173e 100644
> +--- a/include/mount-api-utils.h
> ++++ b/include/mount-api-utils.h
> +@@ -339,7 +339,7 @@ struct ul_statmount {
> + /*
> +  * Special @mnt_id values that can be passed to listmount
> +  */
> +-#ifdef LSMT_ROOT
> ++#ifndef LSMT_ROOT
> + # define LSMT_ROOT              0xffffffffffffffff    /* root mount */
> + #endif
> + 
> +-- 
> +2.53.0
> +
> diff --git a/package/util-linux/util-linux-libs/0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch b/package/util-linux/util-linux-libs/0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch
> new file mode 120000
> index 0000000000..88f6b841f7
> --- /dev/null
> +++ b/package/util-linux/util-linux-libs/0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch
> @@ -0,0 +1 @@
> +../0001-include-mount-api-utils.h-fix-LSMT_ROOT-definition.patch
> \ No newline at end of file
> -- 
> 2.53.0
> 
> _______________________________________________
> buildroot mailing list
> buildroot@buildroot.org
> https://lists.buildroot.org/mailman/listinfo/buildroot
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