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: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Nikolay Borisov <nik.borisov@suse.com>
Link: https://lore.kernel.org/r/20230809102700.29449-3-bp@alien8.de

diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 52df435..054c81b 100644 (file)
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -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)