linux-kernel - [PATCH 5/5] ARM64: kernel: acpi: honour acpi=force command line parameter

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1427219940-27201-6-git-send-email-lorenzo.pieralisi@arm.com>
Date:	Tue, 24 Mar 2015 17:58:55 +0000
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Cc:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>
Subject: [PATCH 5/5] ARM64: kernel: acpi: honour acpi=force command line parameter

If acpi=force is passed on the command line, it forces ACPI to be
the only available boot method, hence it must be left enabled even
if the initialization and sanity checks on ACPI tables fails.

This patch refactors ACPI initialization to prevent disabling ACPI
if acpi=force is passed on the command line.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: Hanjun Guo <hanjun.guo@...aro.org>
Cc: Catalin Marinas <catalin.marinas@....com>
---
 arch/arm64/include/asm/acpi.h | 3 ---
 arch/arm64/kernel/acpi.c      | 6 ++++--
 arch/arm64/kernel/setup.c     | 2 +-
 3 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
index e1a8965..59c05d8 100644
--- a/arch/arm64/include/asm/acpi.h
+++ b/arch/arm64/include/asm/acpi.h
@@ -38,7 +38,6 @@ typedef u64 phys_cpuid_t;
 extern int acpi_disabled;
 extern int acpi_noirq;
 extern int acpi_pci_disabled;
-extern bool param_acpi_force;
 
 /* 1 to indicate PSCI 0.2+ is implemented */
 static inline bool acpi_psci_present(void)
@@ -92,8 +91,6 @@ void __init acpi_init_cpus(void);
 static inline bool acpi_psci_present(void) { return false; }
 static inline bool acpi_psci_use_hvc(void) { return false; }
 static inline void acpi_init_cpus(void) { }
-
-#define param_acpi_force false
 #endif /* CONFIG_ACPI */
 
 #endif /*_ASM_ACPI_H*/
diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
index 542f045..789994a 100644
--- a/arch/arm64/kernel/acpi.c
+++ b/arch/arm64/kernel/acpi.c
@@ -43,7 +43,7 @@ static int enabled_cpus;
 static bool bootcpu_valid  __initdata;
 
 static bool param_acpi_off __initdata;
-bool param_acpi_force __initdata;
+static bool param_acpi_force __initdata;
 
 static int __init parse_acpi(char *arg)
 {
@@ -324,8 +324,10 @@ out:
 	 * If ACPI tables are initialized and FADT sanity checks passed,
 	 * leave ACPI enabled and carry on booting; otherwise disable ACPI
 	 * on initialization error.
+	 * If acpi=force was passed on the command line it forces ACPI
+	 * to be enabled even if its initialization failed.
 	 */
-	if (err)
+	if (err && !param_acpi_force)
 		disable_acpi();
 }
 
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index d60b1ad..b278311 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -390,7 +390,7 @@ void __init setup_arch(char **cmdline_p)
 
 	early_ioremap_reset();
 
-	if (acpi_disabled  && !param_acpi_force) {
+	if (acpi_disabled) {
 		unflatten_device_tree();
 		psci_dt_init();
 		cpu_read_bootcpu_ops();
-- 
2.2.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/