[xen master] xen/arm: use printk_once for errata warning prints

[patchbot@xxxxxxx]

commit f9179d21e864c1f3ae1834f727a8c9f9137ccbbf
Author:     Bertrand Marquis <bertrand.marquis@xxxxxxx>
AuthorDate: Mon Oct 26 16:21:31 2020 +0000
Commit:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
CommitDate: Thu Oct 29 14:02:59 2020 -0700

    xen/arm: use printk_once for errata warning prints
    
    Replace usage of warning_add by printk_once with a **** prefix and
    suffix for errata related warnings.
    
    This prevents the need for the assert which is not secure enough to
    protect this print against wrong usage.
    
    Signed-off-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/arch/arm/cpuerrata.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/xen/arch/arm/cpuerrata.c b/xen/arch/arm/cpuerrata.c
index 0c63dfa779..0430069a84 100644
--- a/xen/arch/arm/cpuerrata.c
+++ b/xen/arch/arm/cpuerrata.c
@@ -157,7 +157,6 @@ extern char __smccc_workaround_1_smc_start[], 
__smccc_workaround_1_smc_end[];
 static int enable_smccc_arch_workaround_1(void *data)
 {
     struct arm_smccc_res res;
-    static bool warned = false;
     const struct arm_cpu_capabilities *entry = data;
 
     /*
@@ -182,13 +181,8 @@ static int enable_smccc_arch_workaround_1(void *data)
                                      "call ARM_SMCCC_ARCH_WORKAROUND_1");
 
 warn:
-    if ( !warned )
-    {
-        ASSERT(system_state < SYS_STATE_active);
-        warning_add("No support for ARM_SMCCC_ARCH_WORKAROUND_1.\n"
-                    "Please update your firmware.\n");
-        warned = true;
-    }
+    printk_once("**** No support for ARM_SMCCC_ARCH_WORKAROUND_1. ****\n"
+                "**** Please update your firmware.                ****\n");
 
     return 0;
 }
--
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