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From: Ard Biesheuvel <ardb@kernel.org>
To: linux@armlinux.org.uk, linux-arm-kernel@lists.infradead.org
Cc: linux-hardening@vger.kernel.org, Ard Biesheuvel <ardb@kernel.org>,
	Arnd Bergmann <arnd@arndb.de>, Kees Cook <keescook@chromium.org>,
	Keith Packard <keithpac@amazon.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Marc Zyngier <maz@kernel.org>
Subject: [PATCH v6 7/8] ARM: drop pointless SMP check on secondary startup path
Date: Tue, 25 Jan 2022 10:14:52 +0100	[thread overview]
Message-ID: <20220125091453.1475246-8-ardb@kernel.org> (raw)
In-Reply-To: <20220125091453.1475246-1-ardb@kernel.org>

Only SMP systems use the secondary startup path by definition, so there
is no need for SMP conditionals there.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/arm/kernel/smp.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 951559e5bea3..e34efa96cea1 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -405,11 +405,6 @@ static void smp_store_cpu_info(unsigned int cpuid)
 
 static void set_current(struct task_struct *cur)
 {
-	if (!IS_ENABLED(CONFIG_CURRENT_POINTER_IN_TPIDRURO) && !is_smp()) {
-		__current = cur;
-		return;
-	}
-
 	/* Set TPIDRURO */
 	asm("mcr p15, 0, %0, c13, c0, 3" :: "r"(cur) : "memory");
 }
-- 
2.30.2


WARNING: multiple messages have this Message-ID (diff)
From: Ard Biesheuvel <ardb@kernel.org>
To: linux@armlinux.org.uk, linux-arm-kernel@lists.infradead.org
Cc: linux-hardening@vger.kernel.org, Ard Biesheuvel <ardb@kernel.org>,
	Arnd Bergmann <arnd@arndb.de>, Kees Cook <keescook@chromium.org>,
	Keith Packard <keithpac@amazon.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Marc Zyngier <maz@kernel.org>
Subject: [PATCH v6 7/8] ARM: drop pointless SMP check on secondary startup path
Date: Tue, 25 Jan 2022 10:14:52 +0100	[thread overview]
Message-ID: <20220125091453.1475246-8-ardb@kernel.org> (raw)
In-Reply-To: <20220125091453.1475246-1-ardb@kernel.org>

Only SMP systems use the secondary startup path by definition, so there
is no need for SMP conditionals there.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/arm/kernel/smp.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 951559e5bea3..e34efa96cea1 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -405,11 +405,6 @@ static void smp_store_cpu_info(unsigned int cpuid)
 
 static void set_current(struct task_struct *cur)
 {
-	if (!IS_ENABLED(CONFIG_CURRENT_POINTER_IN_TPIDRURO) && !is_smp()) {
-		__current = cur;
-		return;
-	}
-
 	/* Set TPIDRURO */
 	asm("mcr p15, 0, %0, c13, c0, 3" :: "r"(cur) : "memory");
 }
-- 
2.30.2


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  parent reply	other threads:[~2022-01-25  9:28 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-25  9:14 [PATCH v6 0/8] ARM vmap'ed and IRQ stacks roundup Ard Biesheuvel
2022-01-25  9:14 ` Ard Biesheuvel
2022-01-25  9:14 ` [PATCH v6 1/8] ARM: mm: switch to swapper_pg_dir early for vmap'ed stack Ard Biesheuvel
2022-01-25  9:14   ` Ard Biesheuvel
2022-01-25  9:14 ` [PATCH v6 2/8] ARM: assembler: define a Kconfig symbol for group relocation support Ard Biesheuvel
2022-01-25  9:14   ` Ard Biesheuvel
2022-01-25  9:14 ` [PATCH v6 3/8] ARM: smp: elide HWCAP_TLS checks or __entry_task updates on SMP+v6 Ard Biesheuvel
2022-01-25  9:14   ` Ard Biesheuvel
2022-01-25  9:14 ` [PATCH v6 4/8] ARM: entry: avoid clobbering R9 in IRQ handler Ard Biesheuvel
2022-01-25  9:14   ` Ard Biesheuvel
2022-01-25  9:14 ` [PATCH v6 5/8] ARM: mm: make vmalloc_seq handling SMP safe Ard Biesheuvel
2022-01-25  9:14   ` Ard Biesheuvel
2022-01-25  9:14 ` [PATCH v6 6/8] ARM: iop: make iop_handle_irq() static Ard Biesheuvel
2022-01-25  9:14   ` Ard Biesheuvel
2022-01-25  9:14 ` Ard Biesheuvel [this message]
2022-01-25  9:14   ` [PATCH v6 7/8] ARM: drop pointless SMP check on secondary startup path Ard Biesheuvel
2022-01-25  9:14 ` [PATCH v6 8/8] ARM: make get_current() and __my_cpu_offset() __always_inline Ard Biesheuvel
2022-01-25  9:14   ` Ard Biesheuvel
2022-01-25 20:48   ` Nick Desaulniers
2022-01-25 20:48     ` Nick Desaulniers

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