From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 95915C433F5 for ; Tue, 30 Nov 2021 13:06:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Ykuo1p5G+aZ5NaN0dayUOfOrq9VNFd58LsvgozCDK7w=; b=ZTKeB5Md70tZxS l9pNIfvsvJJAKD0fFhUUBOBJQOA7il79ohXQIOilF+OJbWGFw9qo/DBN+cjdos5bQACNbb9Y58x2g dtRNaHRO4vphF9s6AGhYa8YRFpyaA8/BaGiv5SFQsR8HFn4nlv9LOKGHnKCrqjIwayvVluwkNZpoH 0zcg7MaFBXcBsf70kiLFUbb5Dgi+DGkK4Lr8bkGSur9+R9kaRnzXizaSUgsMJ87ro4FzXnA9ggWDR Cjn2qrCTkqM5LlFy4GRM8n0CWuPZZsnVvmu7hHacSq+FyGGpMNfhhO94C+BweXVrqGVuhyOm3EFpe A4cI5U6PeVG/canzIXEA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1ms2oH-005Eei-Bg; Tue, 30 Nov 2021 13:04:37 +0000 Received: from sin.source.kernel.org ([2604:1380:40e1:4800::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1ms2jY-005CTy-IJ for linux-arm-kernel@lists.infradead.org; Tue, 30 Nov 2021 12:59:47 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id 9BDF0CE19FD; Tue, 30 Nov 2021 12:59:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B3925C53FCD; Tue, 30 Nov 2021 12:59:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1638277180; bh=kbafQmQgsbdTSPHUZiFqmBfK1Ba5lBIgbNBxjdovItU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Vtvu4Crj8VNKU566OWdXNEAWhndGAl+f+h8KNMj7NY+2ukg02L+ZbntudsL5LyQ39 QpzDet+hfaeNGme0Ogf6+yAO/5GI85JI3lLxyb+J21lACfHSJYDozml19ua8QTfabJ pKQBpSVfoqtguFFcILbW7qUxbBkRFdua4P5ownFvEAYrBcxS9nZS/VNs3smnDyOD0B sIPAMpNVDMD8cQ9LetUvPTQrWT75kl9/7vTJsTVxcL/LBIdADBzjh7qMlJiMHs7sF4 SpgU8dDvQk+FNgHn8tM4EDtnNCnrUN01DSvVa9eMjjhIWiUVeW6jidw8MvR6/0VEIK Emlpws1qxXIZg== From: Ard Biesheuvel To: linux-arm-kernel@lists.infradead.org, linux@armlinux.org.uk Cc: Ard Biesheuvel , Nicolas Pitre , Arnd Bergmann , Kees Cook , Keith Packard , Linus Walleij , Nick Desaulniers , Tony Lindgren Subject: [PATCH v2 12/12] ARM: implement THREAD_INFO_IN_TASK for uniprocessor systems Date: Tue, 30 Nov 2021 13:59:01 +0100 Message-Id: <20211130125901.3054-13-ardb@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211130125901.3054-1-ardb@kernel.org> References: <20211130125901.3054-1-ardb@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=15011; h=from:subject; bh=kbafQmQgsbdTSPHUZiFqmBfK1Ba5lBIgbNBxjdovItU=; b=owEB7QES/pANAwAKAcNPIjmS2Y8kAcsmYgBhpiAUrJ5q/cTqqPT37qzPOBdH/3BezWnqvFV7dbWt tVa9x8GJAbMEAAEKAB0WIQT72WJ8QGnJQhU3VynDTyI5ktmPJAUCYaYgFAAKCRDDTyI5ktmPJBULDA CBbsYOXHSg1Ehw99MkIz2NJoDbzGQ7cwbEPpHtlHbIKkn1PLEcNpMx91WrOh7fIbSHXP74P0FzMx3C MVEWZ0mH0S055JHZaB/yMtzdVFy4FWWaNF6qSaI/3zQHvI6VV9tKnVQg+dduROxnClfZ6ASfgfp3KA 9ThUA8basD/fMLXMHL45OycE/R/6bZP27KQZHFd+LXoD5gr5qupC2QAJ4nF/vdFWgCDEzV5/Ahc6jt M42pwpXolT8VO2HrA7VME9kfWbugeQlbPN+4H+TxqD2QPIoPNv30dxInDtpSPtQH7J7bcNC/Tc0aYM xNXWvI8wV1NZil67DPX1mwuv3KBx8yZE9wCdmz3ZR85TXqqDO3CZmtzhbtr5AEdzyXD+v+yarXHZA1 1rB7ljzjfQKjTcpfBWUDUe7rhgbrFK1VYf8ZlJq521jv1fc0YLLDRytpsKm2lYH4SYnq+0hr1Frt5R 1RWCux/kPLL7G6CiPkXko5Y6YnBbJEmfdq6GyJB4o0WZ8= X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211130_045945_025247_770E7B95 X-CRM114-Status: GOOD ( 28.06 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On UP systems, only a single task can be 'current' at the same time, which means we can use a global variable to track it. This means we can also enable THREAD_INFO_IN_TASK for those systems, as in that case, thread_info is accessed via current rather than the other way around, removing the need to store thread_info at the base of the task stack. This, in turn, permits us to enable IRQ stacks and vmap'ed stacks on UP systems as well. To partially mitigate the performance overhead of this arrangement, use a ADD/ADD/LDR sequence with the appropriate PC-relative group relocations to load the value of current when needed. This means that accessing current will still only require a single load as before, avoiding the need for a literal to carry the address of the global variable in each function. However, accessing thread_info will now require this load as well. Acked-by: Linus Walleij Acked-by: Nicolas Pitre Signed-off-by: Ard Biesheuvel --- arch/arm/Kconfig | 7 +- arch/arm/include/asm/assembler.h | 83 +++++++++++++------- arch/arm/include/asm/current.h | 37 +++++---- arch/arm/include/asm/switch_to.h | 3 +- arch/arm/include/asm/thread_info.h | 27 ------- arch/arm/kernel/asm-offsets.c | 3 - arch/arm/kernel/entry-armv.S | 11 +-- arch/arm/kernel/head-common.S | 4 +- arch/arm/kernel/process.c | 7 +- arch/arm/kernel/smp.c | 11 +++ arch/arm/kernel/traps.c | 4 + 11 files changed, 109 insertions(+), 88 deletions(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 5ad2151c43dd..359a3b85c8b3 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -127,8 +127,8 @@ config ARM select PERF_USE_VMALLOC select RTC_LIB select SYS_SUPPORTS_APM_EMULATION - select THREAD_INFO_IN_TASK if CURRENT_POINTER_IN_TPIDRURO - select HAVE_ARCH_VMAP_STACK if MMU && THREAD_INFO_IN_TASK && (!LD_IS_LLD || LLD_VERSION >= 140000) + select THREAD_INFO_IN_TASK + select HAVE_ARCH_VMAP_STACK if MMU && (!LD_IS_LLD || LLD_VERSION >= 140000) select TRACE_IRQFLAGS_SUPPORT if !CPU_V7M # Above selects are sorted alphabetically; please add new ones # according to that. Thanks. @@ -1158,7 +1158,6 @@ config CURRENT_POINTER_IN_TPIDRURO config IRQSTACKS def_bool y - depends on THREAD_INFO_IN_TASK select HAVE_IRQ_EXIT_ON_IRQ_STACK select HAVE_SOFTIRQ_ON_OWN_STACK @@ -1608,7 +1607,7 @@ config CC_HAVE_STACKPROTECTOR_TLS config STACKPROTECTOR_PER_TASK bool "Use a unique stack canary value for each task" - depends on STACKPROTECTOR && THREAD_INFO_IN_TASK && !XIP_DEFLATED_DATA + depends on STACKPROTECTOR && CURRENT_POINTER_IN_TPIDRURO && !XIP_DEFLATED_DATA depends on GCC_PLUGINS || CC_HAVE_STACKPROTECTOR_TLS select GCC_PLUGIN_ARM_SSP_PER_TASK if !CC_HAVE_STACKPROTECTOR_TLS default y diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h index f9b3dd0e9ef5..59d7b9e81934 100644 --- a/arch/arm/include/asm/assembler.h +++ b/arch/arm/include/asm/assembler.h @@ -203,41 +203,12 @@ THUMB( fpreg .req r7 ) .endm .endr - .macro get_current, rd -#ifdef CONFIG_CURRENT_POINTER_IN_TPIDRURO - mrc p15, 0, \rd, c13, c0, 3 @ get TPIDRURO register -#else - get_thread_info \rd - ldr \rd, [\rd, #TI_TASK] -#endif - .endm - - .macro set_current, rn -#ifdef CONFIG_CURRENT_POINTER_IN_TPIDRURO - mcr p15, 0, \rn, c13, c0, 3 @ set TPIDRURO register -#endif - .endm - - .macro reload_current, t1:req, t2:req -#ifdef CONFIG_CURRENT_POINTER_IN_TPIDRURO - ldr_this_cpu \t1, __entry_task, \t1, \t2 - mcr p15, 0, \t1, c13, c0, 3 @ store in TPIDRURO -#endif - .endm - /* * Get current thread_info. */ .macro get_thread_info, rd -#ifdef CONFIG_THREAD_INFO_IN_TASK /* thread_info is the first member of struct task_struct */ get_current \rd -#else - ARM( mov \rd, sp, lsr #THREAD_SIZE_ORDER + PAGE_SHIFT ) - THUMB( mov \rd, sp ) - THUMB( lsr \rd, \rd, #THREAD_SIZE_ORDER + PAGE_SHIFT ) - mov \rd, \rd, lsl #THREAD_SIZE_ORDER + PAGE_SHIFT -#endif .endm /* @@ -330,6 +301,60 @@ ALT_UP_B(.L1_\@) #endif .endm + /* + * set_current - store the task pointer of this CPU's current task + */ + .macro set_current, rn:req, tmp:req +#if defined(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || defined(CONFIG_SMP) +9998: mcr p15, 0, \rn, c13, c0, 3 @ set TPIDRURO register +#ifdef CONFIG_CPU_V6 +ALT_UP_B(.L0_\@) + .subsection 1 +.L0_\@: str_va \rn, __current, \tmp + b .L1_\@ + .previous +.L1_\@: +#endif +#else + str_va \rn, __current, \tmp +#endif + .endm + + /* + * get_current - load the task pointer of this CPU's current task + */ + .macro get_current, rd:req +#if defined(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || defined(CONFIG_SMP) +9998: mrc p15, 0, \rd, c13, c0, 3 @ get TPIDRURO register +#ifdef CONFIG_CPU_V6 +ALT_UP_B(.L0_\@) + .subsection 1 +.L0_\@: ldr_va \rd, __current + b .L1_\@ + .previous +.L1_\@: +#endif +#else + ldr_va \rd, __current +#endif + .endm + + /* + * reload_current - reload the task pointer of this CPU's current task + * into the TLS register + */ + .macro reload_current, t1:req, t2:req +#if defined(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || defined(CONFIG_SMP) +#ifdef CONFIG_CPU_V6 +ALT_SMP(nop) +ALT_UP_B(.L0_\@) +#endif + ldr_this_cpu \t1, __entry_task, \t1, \t2 + mcr p15, 0, \t1, c13, c0, 3 @ store in TPIDRURO +.L0_\@: +#endif + .endm + /* * Instruction barrier */ diff --git a/arch/arm/include/asm/current.h b/arch/arm/include/asm/current.h index 6bf0aad672c3..69ecf4c6c725 100644 --- a/arch/arm/include/asm/current.h +++ b/arch/arm/include/asm/current.h @@ -8,25 +8,18 @@ #define _ASM_ARM_CURRENT_H #ifndef __ASSEMBLY__ +#include struct task_struct; -static inline void set_current(struct task_struct *cur) -{ - if (!IS_ENABLED(CONFIG_CURRENT_POINTER_IN_TPIDRURO)) - return; - - /* Set TPIDRURO */ - asm("mcr p15, 0, %0, c13, c0, 3" :: "r"(cur) : "memory"); -} +extern struct task_struct *__current; -#ifdef CONFIG_CURRENT_POINTER_IN_TPIDRURO - -static inline struct task_struct *get_current(void) +static inline __attribute_const__ struct task_struct *get_current(void) { struct task_struct *cur; #if __has_builtin(__builtin_thread_pointer) && \ + defined(CONFIG_CURRENT_POINTER_IN_TPIDRURO) && \ !(defined(CONFIG_THUMB2_KERNEL) && \ defined(CONFIG_CC_IS_CLANG) && CONFIG_CLANG_VERSION < 130001) /* @@ -39,16 +32,30 @@ static inline struct task_struct *get_current(void) * https://github.com/ClangBuiltLinux/linux/issues/1485 */ cur = __builtin_thread_pointer(); +#elif defined(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || defined(CONFIG_SMP) + asm("0: mrc p15, 0, %0, c13, c0, 3 \n\t" +#ifdef CONFIG_CPU_V6 + "1: \n\t" + " .subsection 1 \n\t" + "2: " LOAD_SYM_ARMV6(%0, __current) " \n\t" + " b 1b \n\t" + " .previous \n\t" + " .pushsection \".alt.smp.init\", \"a\" \n\t" + " .long 0b - . \n\t" + " b . + (2b - 0b) \n\t" + " .popsection \n\t" +#endif + : "=r"(cur)); +#elif __LINUX_ARM_ARCH__>=7 || \ + (defined(MODULE) && defined(CONFIG_ARM_MODULE_PLTS)) + cur = __current; #else - asm("mrc p15, 0, %0, c13, c0, 3" : "=r"(cur)); + asm(LOAD_SYM_ARMV6(%0, __current) : "=r"(cur)); #endif return cur; } #define current get_current() -#else -#include -#endif /* CONFIG_CURRENT_POINTER_IN_TPIDRURO */ #endif /* __ASSEMBLY__ */ diff --git a/arch/arm/include/asm/switch_to.h b/arch/arm/include/asm/switch_to.h index b55c7b2755e4..a482c99934ff 100644 --- a/arch/arm/include/asm/switch_to.h +++ b/arch/arm/include/asm/switch_to.h @@ -40,7 +40,8 @@ static inline void set_ti_cpu(struct task_struct *p) do { \ __complete_pending_tlbi(); \ set_ti_cpu(next); \ - if (IS_ENABLED(CONFIG_CURRENT_POINTER_IN_TPIDRURO)) \ + if (IS_ENABLED(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || \ + IS_ENABLED(CONFIG_SMP)) \ __this_cpu_write(__entry_task, next); \ last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \ } while (0) diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h index 004b89d86224..aecc403b2880 100644 --- a/arch/arm/include/asm/thread_info.h +++ b/arch/arm/include/asm/thread_info.h @@ -62,9 +62,6 @@ struct cpu_context_save { struct thread_info { unsigned long flags; /* low level flags */ int preempt_count; /* 0 => preemptable, <0 => bug */ -#ifndef CONFIG_THREAD_INFO_IN_TASK - struct task_struct *task; /* main task structure */ -#endif __u32 cpu; /* cpu */ __u32 cpu_domain; /* cpu domain */ struct cpu_context_save cpu_context; /* cpu context */ @@ -80,39 +77,15 @@ struct thread_info { #define INIT_THREAD_INFO(tsk) \ { \ - INIT_THREAD_INFO_TASK(tsk) \ .flags = 0, \ .preempt_count = INIT_PREEMPT_COUNT, \ } -#ifdef CONFIG_THREAD_INFO_IN_TASK -#define INIT_THREAD_INFO_TASK(tsk) - static inline struct task_struct *thread_task(struct thread_info* ti) { return (struct task_struct *)ti; } -#else -#define INIT_THREAD_INFO_TASK(tsk) .task = &(tsk), - -static inline struct task_struct *thread_task(struct thread_info* ti) -{ - return ti->task; -} - -/* - * how to get the thread information struct from C - */ -static inline struct thread_info *current_thread_info(void) __attribute_const__; - -static inline struct thread_info *current_thread_info(void) -{ - return (struct thread_info *) - (current_stack_pointer & ~(THREAD_SIZE - 1)); -} -#endif - #define thread_saved_pc(tsk) \ ((unsigned long)(task_thread_info(tsk)->cpu_context.pc)) #define thread_saved_sp(tsk) \ diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c index 645845e4982a..2c8d76fd7c66 100644 --- a/arch/arm/kernel/asm-offsets.c +++ b/arch/arm/kernel/asm-offsets.c @@ -43,9 +43,6 @@ int main(void) BLANK(); DEFINE(TI_FLAGS, offsetof(struct thread_info, flags)); DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count)); -#ifndef CONFIG_THREAD_INFO_IN_TASK - DEFINE(TI_TASK, offsetof(struct thread_info, task)); -#endif DEFINE(TI_CPU, offsetof(struct thread_info, cpu)); DEFINE(TI_CPU_DOMAIN, offsetof(struct thread_info, cpu_domain)); DEFINE(TI_CPU_SAVE, offsetof(struct thread_info, cpu_context)); diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index 43d917f0d9a9..b58bda51e4b8 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -807,12 +807,13 @@ ENTRY(__switch_to) switch_tls r1, r4, r5, r3, r7 #if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_SMP) && \ !defined(CONFIG_STACKPROTECTOR_PER_TASK) - ldr r9, [r2, #TI_TASK] ldr r8, =__stack_chk_guard .if (TSK_STACK_CANARY > IMM12_MASK) - add r9, r9, #TSK_STACK_CANARY & ~IMM12_MASK - .endif + add r9, r2, #TSK_STACK_CANARY & ~IMM12_MASK ldr r9, [r9, #TSK_STACK_CANARY & IMM12_MASK] + .else + ldr r9, [r2, #TSK_STACK_CANARY & IMM12_MASK] + .endif #endif mov r7, r2 @ Preserve 'next' #ifdef CONFIG_CPU_USE_DOMAINS @@ -829,7 +830,7 @@ ENTRY(__switch_to) #endif mov r0, r5 #if !defined(CONFIG_THUMB2_KERNEL) && !defined(CONFIG_VMAP_STACK) - set_current r7 + set_current r7, r8 ldmia r4, {r4 - sl, fp, sp, pc} @ Load all regs saved previously #else mov r1, r7 @@ -851,7 +852,7 @@ ENTRY(__switch_to) @ switches us to another stack, with few other side effects. In order @ to prevent this distinction from causing any inconsistencies, let's @ keep the 'set_current' call as close as we can to the update of SP. - set_current r1 + set_current r1, r2 mov sp, ip ret lr #endif diff --git a/arch/arm/kernel/head-common.S b/arch/arm/kernel/head-common.S index da18e0a17dc2..42cae73fcc19 100644 --- a/arch/arm/kernel/head-common.S +++ b/arch/arm/kernel/head-common.S @@ -105,10 +105,8 @@ __mmap_switched: mov r1, #0 bl __memset @ clear .bss -#ifdef CONFIG_CURRENT_POINTER_IN_TPIDRURO adr_l r0, init_task @ get swapper task_struct - set_current r0 -#endif + set_current r0, r1 ldmia r4, {r0, r1, r2, r3} str r9, [r0] @ Save processor ID diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c index d47159f3791c..0617af11377f 100644 --- a/arch/arm/kernel/process.c +++ b/arch/arm/kernel/process.c @@ -36,7 +36,7 @@ #include "signal.h" -#ifdef CONFIG_CURRENT_POINTER_IN_TPIDRURO +#if defined(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || defined(CONFIG_SMP) DEFINE_PER_CPU(struct task_struct *, __entry_task); #endif @@ -46,6 +46,11 @@ unsigned long __stack_chk_guard __read_mostly; EXPORT_SYMBOL(__stack_chk_guard); #endif +#ifndef CONFIG_CURRENT_POINTER_IN_TPIDRURO +asmlinkage struct task_struct *__current; +EXPORT_SYMBOL(__current); +#endif + static const char *processor_modes[] __maybe_unused = { "USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" , "UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26", diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 9c55ca915ba4..951559e5bea3 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -403,6 +403,17 @@ static void smp_store_cpu_info(unsigned int cpuid) check_cpu_icache_size(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"); +} + /* * This is the secondary CPU boot entry. We're using this CPUs * idle thread stack, but a set of temporary page tables. diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index b28a705c49cb..3f38357efc46 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -865,7 +865,9 @@ early_initcall(allocate_overflow_stacks); asmlinkage void handle_bad_stack(struct pt_regs *regs) { unsigned long tsk_stk = (unsigned long)current->stack; +#ifdef CONFIG_IRQSTACKS unsigned long irq_stk = (unsigned long)this_cpu_read(irq_stack_ptr); +#endif unsigned long ovf_stk = (unsigned long)this_cpu_read(overflow_stack_ptr); console_verbose(); @@ -873,8 +875,10 @@ asmlinkage void handle_bad_stack(struct pt_regs *regs) pr_emerg("Task stack: [0x%08lx..0x%08lx]\n", tsk_stk, tsk_stk + THREAD_SIZE); +#ifdef CONFIG_IRQSTACKS pr_emerg("IRQ stack: [0x%08lx..0x%08lx]\n", irq_stk - THREAD_SIZE, irq_stk); +#endif pr_emerg("Overflow stack: [0x%08lx..0x%08lx]\n", ovf_stk - OVERFLOW_STACK_SIZE, ovf_stk); -- 2.30.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel