linux-kernel - [PATCH] arm64: cpufeature: Add "or" to mitigations for multiple errata

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Message-Id: <20200512124238.28792-1-geert+renesas@glider.be>
Date:   Tue, 12 May 2020 14:42:38 +0200
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] arm64: cpufeature: Add "or" to mitigations for multiple errata

Several actions are not mitigations for a single erratum, but for
multiple errata.  However, printing a line like

    CPU features: detected: ARM errata 1165522, 1319367, 1530923

may give the false impression that all three listed errata have been
detected.  This can confuse the user, who may think his Cortex-A57 is
suddenly affected by Cortex-A76 and Cortex-A55 errata.

Add "or" to all descriptions for mitigations for multiple errata, to
make it clear that only one or more of the errata printed are
applicable, and not necessarily all of them.

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
 arch/arm64/kernel/cpu_errata.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index 95006a7910262288..b0ce6bf14f6a92c8 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -778,7 +778,7 @@ static const struct midr_range erratum_speculative_at_list[] = {
 const struct arm64_cpu_capabilities arm64_errata[] = {
 #ifdef CONFIG_ARM64_WORKAROUND_CLEAN_CACHE
 	{
-		.desc = "ARM errata 826319, 827319, 824069, 819472",
+		.desc = "ARM errata 826319, 827319, 824069, or 819472",
 		.capability = ARM64_WORKAROUND_CLEAN_CACHE,
 		ERRATA_MIDR_RANGE_LIST(workaround_clean_cache),
 		.cpu_enable = cpu_enable_cache_maint_trap,
@@ -860,7 +860,7 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
 #endif
 #ifdef CONFIG_ARM64_WORKAROUND_REPEAT_TLBI
 	{
-		.desc = "Qualcomm erratum 1009, ARM erratum 1286807",
+		.desc = "Qualcomm erratum 1009, or ARM erratum 1286807",
 		.capability = ARM64_WORKAROUND_REPEAT_TLBI,
 		.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
 		.matches = cpucap_multi_entry_cap_matches,
@@ -903,7 +903,7 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
 #endif
 #ifdef CONFIG_ARM64_WORKAROUND_SPECULATIVE_AT
 	{
-		.desc = "ARM errata 1165522, 1319367, 1530923",
+		.desc = "ARM errata 1165522, 1319367, or 1530923",
 		.capability = ARM64_WORKAROUND_SPECULATIVE_AT,
 		ERRATA_MIDR_RANGE_LIST(erratum_speculative_at_list),
 	},
-- 
2.17.1