third_party/linux/patches/enable-pmsg.patch

From 9558d3ae7a94a56e64e1ba00469b21c721323d0c Mon Sep 17 00:00:00 2001
From: Lorenz Brun <lorenz@monogon.tech>
Date: Mon, 29 Jan 2024 22:17:13 +0100
Subject: [PATCH] drivers: pstore: enable pmsg for ERST and EFI backends

This enables pstore for userspace messages for the ACPI ERST as well as
the EFI variable pstore backend, both of which are expected to be used
frequently with Metropolis. We need that to reliably store panics of
core processes regardless of the system state. This is not enabled
upstream, either because pmsg was a later addition to pstore or for
concerns of accidentally running out of pstore space. We work around
the limited space issue by always clearing pstore after every boot, so
this poses little extra risk to us.
---
 drivers/acpi/apei/erst.c          | 2 +-
 drivers/firmware/efi/efi-pstore.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
index bf65e3461531..fe2c331b4b99 100644
--- a/drivers/acpi/apei/erst.c
+++ b/drivers/acpi/apei/erst.c
@@ -1022,7 +1022,7 @@ static int erst_clearer(struct pstore_record *record);
 static struct pstore_info erst_info = {
 	.owner		= THIS_MODULE,
 	.name		= "erst",
-	.flags		= PSTORE_FLAGS_DMESG,
+	.flags		= PSTORE_FLAGS_DMESG | PSTORE_FLAGS_PMSG,
 	.open		= erst_open_pstore,
 	.close		= erst_close_pstore,
 	.read		= erst_reader,
diff --git a/drivers/firmware/efi/efi-pstore.c b/drivers/firmware/efi/efi-pstore.c
index 552c78f5f059..9e5651fd1439 100644
--- a/drivers/firmware/efi/efi-pstore.c
+++ b/drivers/firmware/efi/efi-pstore.c
@@ -245,7 +245,7 @@ static int efi_pstore_erase(struct pstore_record *record)
 static struct pstore_info efi_pstore_info = {
 	.owner		= THIS_MODULE,
 	.name		= KBUILD_MODNAME,
-	.flags		= PSTORE_FLAGS_DMESG,
+	.flags		= PSTORE_FLAGS_DMESG | PSTORE_FLAGS_PMSG,
 	.open		= efi_pstore_open,
 	.close		= efi_pstore_close,
 	.read		= efi_pstore_read,
-- 
2.47.2