[xen staging] x86/MTRR: correct inadvertently inverted WC check

[patchbot@xxxxxxx]

commit 77e25f0e30ddd11e043e6fce84bf108ce7de5b6f
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Apr 23 14:13:48 2024 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Apr 23 14:13:48 2024 +0200

    x86/MTRR: correct inadvertently inverted WC check
    
    The ! clearly got lost by mistake.
    
    Fixes: e9e0eb30d4d6 ("x86/MTRR: avoid several indirect calls")
    Reported-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/arch/x86/cpu/mtrr/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/cpu/mtrr/main.c b/xen/arch/x86/cpu/mtrr/main.c
index 55a4da54a7..90b235f57e 100644
--- a/xen/arch/x86/cpu/mtrr/main.c
+++ b/xen/arch/x86/cpu/mtrr/main.c
@@ -316,7 +316,7 @@ int mtrr_add_page(unsigned long base, unsigned long size,
        }
 
        /*  If the type is WC, check that this processor supports it  */
-       if ((type == X86_MT_WC) && mtrr_have_wrcomb()) {
+       if ((type == X86_MT_WC) && !mtrr_have_wrcomb()) {
                printk(KERN_WARNING
                       "mtrr: your processor doesn't support 
write-combining\n");
                return -EOPNOTSUPP;
--
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