Commit 0fddfe33 authored by Borislav Petkov (AMD)'s avatar Borislav Petkov (AMD)
Browse files

driver core: cpu: Unify redundant silly stubs 



Make them all a weak function, aliasing to a single function which
issues the "Not affected" string.

No functional changes.

Suggested-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: default avatarNikolay Borisov <nik.borisov@suse.com>
Link: https://lore.kernel.org/r/20230809102700.29449-3-bp@alien8.de
parent 182ac870

drivers/base/cpu.c

+19 −68
Original line number Diff line number Diff line
@@ -509,79 +509,30 @@ static void __init cpu_dev_register_generic(void) 
}



#ifdef CONFIG_GENERIC_CPU_VULNERABILITIES



ssize_t __weak cpu_show_meltdown(struct device *dev,

				 struct device_attribute *attr, char *buf)

{

	return sysfs_emit(buf, "Not affected\n");

}



ssize_t __weak cpu_show_spectre_v1(struct device *dev,

				   struct device_attribute *attr, char *buf)

{

	return sysfs_emit(buf, "Not affected\n");

}



ssize_t __weak cpu_show_spectre_v2(struct device *dev,

				   struct device_attribute *attr, char *buf)

{

	return sysfs_emit(buf, "Not affected\n");

}



ssize_t __weak cpu_show_spec_store_bypass(struct device *dev,

					  struct device_attribute *attr, char *buf)

{

	return sysfs_emit(buf, "Not affected\n");

}



ssize_t __weak cpu_show_l1tf(struct device *dev,

			     struct device_attribute *attr, char *buf)

{

	return sysfs_emit(buf, "Not affected\n");

}



ssize_t __weak cpu_show_mds(struct device *dev,

			    struct device_attribute *attr, char *buf)

{

	return sysfs_emit(buf, "Not affected\n");

}



ssize_t __weak cpu_show_tsx_async_abort(struct device *dev,

					struct device_attribute *attr,

					char *buf)

{

	return sysfs_emit(buf, "Not affected\n");

}



ssize_t __weak cpu_show_itlb_multihit(struct device *dev,

				      struct device_attribute *attr, char *buf)

{

	return sysfs_emit(buf, "Not affected\n");

}



ssize_t __weak cpu_show_srbds(struct device *dev,

ssize_t cpu_show_not_affected(struct device *dev,

			      struct device_attribute *attr, char *buf)

{

	return sysfs_emit(buf, "Not affected\n");

}



ssize_t __weak cpu_show_mmio_stale_data(struct device *dev,

					struct device_attribute *attr, char *buf)

{

	return sysfs_emit(buf, "Not affected\n");

}



ssize_t __weak cpu_show_retbleed(struct device *dev,

				 struct device_attribute *attr, char *buf)

{

	return sysfs_emit(buf, "Not affected\n");

}



ssize_t __weak cpu_show_spec_rstack_overflow(struct device *dev,

					     struct device_attribute *attr, char *buf)

{

	return sysfs_emit(buf, "Not affected\n");

}

#define CPU_SHOW_VULN_FALLBACK(func)					\

	ssize_t cpu_show_##func(struct device *,			\

				  struct device_attribute *, char *)	\

		 __attribute__((weak, alias("cpu_show_not_affected")))



CPU_SHOW_VULN_FALLBACK(meltdown);

CPU_SHOW_VULN_FALLBACK(spectre_v1);

CPU_SHOW_VULN_FALLBACK(spectre_v2);

CPU_SHOW_VULN_FALLBACK(spec_store_bypass);

CPU_SHOW_VULN_FALLBACK(l1tf);

CPU_SHOW_VULN_FALLBACK(mds);

CPU_SHOW_VULN_FALLBACK(tsx_async_abort);

CPU_SHOW_VULN_FALLBACK(itlb_multihit);

CPU_SHOW_VULN_FALLBACK(srbds);

CPU_SHOW_VULN_FALLBACK(mmio_stale_data);

CPU_SHOW_VULN_FALLBACK(retbleed);

CPU_SHOW_VULN_FALLBACK(spec_rstack_overflow);

CPU_SHOW_VULN_FALLBACK(gather_data_sampling);



ssize_t __weak cpu_show_gds(struct device *dev,

			    struct device_attribute *attr, char *buf)