Looks like a kernel sysfs API mismatch

[trinashih]

looks like a kernel sysfs API mismatch on new kernel. mine is 6.18.2

make -C /lib/modules/uname -r/build M=$PWD modules
make[1]: Entering directory '/usr/src/linux-headers-6.18.2-amdsos-build70-ubuntu-24.04+'
make[2]: Entering directory '/home/amd/amd_hsmp'
warning: the compiler differs from the one used to build the kernel
The kernel was built by: gcc (Ubuntu 11.4.0-1ubuntu122.04.2) 11.4.0
You are using: gcc (Ubuntu 13.3.0-6ubuntu224.04.1) 13.3.0
CC [M] acpi.o
acpi.c:592:10: error: ‘const struct bin_attribute’ has no member named ‘read_new’
592 | .read_new = hsmp_metric_tbl_acpi_read,
| ^~~~~~~~
acpi.c:592:21: warning: initialization of ‘long unsigned int’ from ‘ssize_t (*)(struct file *, struct kobject *, const struct bin_attribute *, char , loff_t, size_t)’ {aka ‘long int ()(struct file *, struct kobject *, const struct bin_attribute *, char *, long long int, long unsigned int)’} makes integer from pointer without a cast [-Wint-conversion]
592 | .read_new = hsmp_metric_tbl_acpi_read,
| ^~~~~~~~~~~~~~~~~~~~~~~~~
acpi.c:592:21: note: (near initialization for ‘hsmp_metric_tbl_attr.size’)
acpi.c:655:10: error: ‘const struct attribute_group’ has no member named ‘bin_attrs_new’; did you mean ‘bin_attrs’?
655 | .bin_attrs_new = hsmp_attr_list,
| ^~~~~~~~~~~~~
| bin_attrs
acpi.c:655:26: error: initialization of ‘const char *’ from incompatible pointer type ‘const struct bin_attribute **’ [-Werror=incompatible-pointer-types]
655 | .bin_attrs_new = hsmp_attr_list,
| ^~~~~~~~~~~~~~
acpi.c:655:26: note: (near initialization for ‘hsmp_attr_grp.name’)
cc1: some warnings being treated as errors
make[4]: *** [/usr/src/linux-headers-6.18.2-amdsos-build70-ubuntu-24.04+/scripts/Makefile.build:287: acpi.o] Error 1
make[3]: *** [/usr/src/linux-headers-6.18.2-amdsos-build70-ubuntu-24.04+/Makefile:2010: .] Error 2
make[2]: *** [/usr/src/linux-headers-6.18.2-amdsos-build70-ubuntu-24.04+/Makefile:248: __sub-make] Error 2
make[2]: Leaving directory '/home/amd/amd_hsmp'
make[1]: *** [Makefile:248: __sub-make] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-6.18.2-amdsos-build70-ubuntu-24.04+'
make: *** [Makefile:16: default] Error 2
amd@morocco-0416-host:~/amd_hsmp$

[trinashih]

When building amd_hsmp on Linux 6.18.2, there are two compatibility issues related to Linux sysfs API changes:

Removed sysfs members for newer kernels
The source uses .read_new and .bin_attrs_new in the >= 6.14 path, but these members are not present on kernel 6.18.2. This causes build failures in acpi.c and plat.c.

Const type mismatch for bin_attrs
On kernel 6.18.2, .bin_attrs expects a const-qualified bin attribute list, but the current code provides a non-const pointer type. This causes an incompatible pointer type error during build.