x86/microcode/AMD: Fix a -Wsometimes-uninitialized clang false positive

commit 5343558a868e7e635b40baa2e46bf53df1a2d131 upstream.

Initialize equiv_id in order to shut up:

  arch/x86/kernel/cpu/microcode/amd.c:714:6: warning: variable 'equiv_id' is \
  used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
        if (x86_family(bsp_cpuid_1_eax) < 0x17) {
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

because clang doesn't do interprocedural analysis for warnings to see
that this variable won't be used uninitialized.

Fixes: 94838d230a6c ("x86/microcode/AMD: Use the family,model,stepping encoded in the patch ID")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202407291815.gJBST0P3-lkp@intel.com/
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 9eb9c0681f6f8ffc988f49423891343ab38c3cbf..13a632da09ed7bc3be22c9d3c60adca958d1e0fb 100644 (file)
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -813,7 +813,7 @@ static void free_cache(void)
 static struct ucode_patch *find_patch(unsigned int cpu)
 {
        struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
-       u16 equiv_id;
+       u16 equiv_id = 0;
 
        uci->cpu_sig.rev = get_patch_level();