From mboxrd@z Thu Jan 1 00:00:00 1970 From: ard.biesheuvel@linaro.org (Ard Biesheuvel) Date: Wed, 18 Mar 2015 15:55:22 +0100 Subject: [PATCH v5 3/8] arm64: remove processor_id In-Reply-To: <1426690527-14258-1-git-send-email-ard.biesheuvel@linaro.org> References: <1426690527-14258-1-git-send-email-ard.biesheuvel@linaro.org> Message-ID: <1426690527-14258-4-git-send-email-ard.biesheuvel@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org The global processor_id is assigned the MIDR_EL1 value of the boot CPU in the early init code, but is never referenced afterwards. As the relevance of the MIDR_EL1 value of the boot CPU is debatable anyway, especially under big.LITTLE, let's remove it before anyone starts using it. Reviewed-by: Mark Rutland Reviewed-by: Catalin Marinas Signed-off-by: Ard Biesheuvel --- arch/arm64/kernel/head.S | 7 +------ arch/arm64/kernel/setup.c | 3 --- 2 files changed, 1 insertion(+), 9 deletions(-) diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S index c3631ec8fe4b..c9131f94be19 100644 --- a/arch/arm64/kernel/head.S +++ b/arch/arm64/kernel/head.S @@ -244,7 +244,6 @@ ENTRY(stext) bl el2_setup // Drop to EL1, w20=cpu_boot_mode bl __calc_phys_offset // x24=PHYS_OFFSET, x28=PHYS_OFFSET-PAGE_OFFSET bl set_cpu_boot_mode_flag - mrs x22, midr_el1 // x22=cpuid bl __vet_fdt bl __create_page_tables // x25=TTBR0, x26=TTBR1 @@ -427,7 +426,6 @@ __switch_data: .quad __mmap_switched .quad __bss_start // x6 .quad __bss_stop // x7 - .quad processor_id // x4 .quad __fdt_pointer // x5 .quad memstart_addr // x6 .quad init_thread_union + THREAD_START_SP // sp @@ -445,11 +443,10 @@ __mmap_switched: str xzr, [x6], #8 // Clear BSS b 1b 2: - ldp x4, x5, [x3], #16 + ldr x5, [x3], #8 ldr x6, [x3], #8 ldr x16, [x3] mov sp, x16 - str x22, [x4] // Save processor ID str x21, [x5] // Save FDT pointer str x24, [x6] // Save PHYS_OFFSET mov x29, #0 @@ -621,8 +618,6 @@ ENTRY(secondary_startup) /* * Common entry point for secondary CPUs. */ - mrs x22, midr_el1 // x22=cpuid - pgtbl x25, x26, x28 // x25=TTBR0, x26=TTBR1 bl __cpu_setup // initialise processor diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index a19eae29497c..6c5fb5aff325 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -62,9 +62,6 @@ #include #include -unsigned int processor_id; -EXPORT_SYMBOL(processor_id); - unsigned long elf_hwcap __read_mostly; EXPORT_SYMBOL_GPL(elf_hwcap); -- 1.8.3.2