FAILED: patch "[PATCH] arm64: errata: Add KRYO 2XX/3XX/4XX silver cores to Spectre" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 0c9fc6e652cd5aed48c5f700c32b7642bea7f453
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2025041759-germinate-audacious-ec98@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 0c9fc6e652cd5aed48c5f700c32b7642bea7f453 Mon Sep 17 00:00:00 2001
From: Douglas Anderson <dianders@chromium.org>
Date: Tue, 7 Jan 2025 12:06:00 -0800
Subject: [PATCH] arm64: errata: Add KRYO 2XX/3XX/4XX silver cores to Spectre
 BHB safe list

Qualcomm has confirmed that, much like Cortex A53 and A55, KRYO
2XX/3XX/4XX silver cores are unaffected by Spectre BHB. Add them to
the safe list.

Fixes: 558c303c9734 ("arm64: Mitigate spectre style branch history side channels")
Cc: stable@vger.kernel.org
Cc: Scott Bauer <sbauer@quicinc.com>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Trilok Soni <quic_tsoni@quicinc.com>
Link: https://lore.kernel.org/r/20250107120555.v4.3.Iab8dbfb5c9b1e143e7a29f410bce5f9525a0ba32@changeid
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pack.c
index 17aa836fe46d..89405be53d8f 100644
--- a/arch/arm64/kernel/proton-pack.c
+++ b/arch/arm64/kernel/proton-pack.c
@@ -854,6 +854,9 @@ static bool is_spectre_bhb_safe(int scope)
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A510),
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A520),
 		MIDR_ALL_VERSIONS(MIDR_BRAHMA_B53),
+		MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_2XX_SILVER),
+		MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_3XX_SILVER),
+		MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_4XX_SILVER),
 		{},
 	};
 	static bool all_safe = true;