From a5788caa269e446201018bb8879a1dd90f41d32b Mon Sep 17 00:00:00 2001 From: David Howells Date: Fri, 2 Nov 2012 13:20:42 +0000 Subject: FRV: Add missing linux/export.h #inclusions Add missing linux/export.h #inclusions to the FRV arch. Signed-off-by: David Howells --- arch/frv/mb93090-mb00/pci-dma-nommu.c | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/frv') diff --git a/arch/frv/mb93090-mb00/pci-dma-nommu.c b/arch/frv/mb93090-mb00/pci-dma-nommu.c index e47857f889b..b99c2a7cc7a 100644 --- a/arch/frv/mb93090-mb00/pci-dma-nommu.c +++ b/arch/frv/mb93090-mb00/pci-dma-nommu.c @@ -11,6 +11,7 @@ #include #include +#include #include #include #include -- cgit v1.2.3-70-g09d2 From 5f0231d97b2d361292b090b81479a68123010376 Mon Sep 17 00:00:00 2001 From: David Howells Date: Fri, 2 Nov 2012 13:20:42 +0000 Subject: FRV: Don't objcopy the GNU build_id note Don't let objcopy transfer the GNU build_id note into the loadable image as it is located at address 0 and the image ends up >3G in size. Signed-off-by: David Howells --- arch/frv/boot/Makefile | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'arch/frv') diff --git a/arch/frv/boot/Makefile b/arch/frv/boot/Makefile index 6ae3254da01..636d5bbcd53 100644 --- a/arch/frv/boot/Makefile +++ b/arch/frv/boot/Makefile @@ -17,6 +17,8 @@ PARAMS_PHYS = 0x0207c000 INITRD_PHYS = 0x02180000 INITRD_VIRT = 0x02180000 +OBJCOPYFLAGS :=-O binary -R .note -R .note.gnu.build-id -R .comment + # # If you don't define ZRELADDR above, # then it defaults to ZTEXTADDR @@ -32,18 +34,18 @@ Image: $(obj)/Image targets: $(obj)/Image $(obj)/Image: vmlinux FORCE - $(OBJCOPY) -O binary -R .note -R .comment -S vmlinux $@ + $(OBJCOPY) $(OBJCOPYFLAGS) -S vmlinux $@ #$(obj)/Image: $(CONFIGURE) $(SYSTEM) -# $(OBJCOPY) -O binary -R .note -R .comment -g -S $(SYSTEM) $@ +# $(OBJCOPY) $(OBJCOPYFLAGS) -g -S $(SYSTEM) $@ bzImage: zImage zImage: $(CONFIGURE) compressed/$(LINUX) - $(OBJCOPY) -O binary -R .note -R .comment -S compressed/$(LINUX) $@ + $(OBJCOPY) $(OBJCOPYFLAGS) -S compressed/$(LINUX) $@ bootpImage: bootp/bootp - $(OBJCOPY) -O binary -R .note -R .comment -S bootp/bootp $@ + $(OBJCOPY) $(OBJCOPYFLAGS) -S bootp/bootp $@ compressed/$(LINUX): $(LINUX) dep @$(MAKE) -C compressed $(LINUX) -- cgit v1.2.3-70-g09d2 From 1ee6f5669a7eaba0e2f4e0dd0599b56eb8a9a090 Mon Sep 17 00:00:00 2001 From: David Howells Date: Fri, 2 Nov 2012 13:20:42 +0000 Subject: FRV: Fix the preemption handling Fix the preemption handling in FRV code where the PREEMPT_ACTIVE value is incorrectly loaded into the threadinfo flags rather than the threadinfo preemption count. Unfortunately, the code cannot be simply converted to use preempt_schedule_irq() as is because FRV uses virtual interrupt disablement to cut down on the cost of actually disabling interrupts and thus local_irq_enable() doesn't actually enable interrupts. Reported-by: Al Viro Signed-off-by: David Howells cc: Al Viro --- arch/frv/kernel/entry.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/frv') diff --git a/arch/frv/kernel/entry.S b/arch/frv/kernel/entry.S index ee0beb354e4..d64c5262796 100644 --- a/arch/frv/kernel/entry.S +++ b/arch/frv/kernel/entry.S @@ -1086,7 +1086,7 @@ __entry_preempt_need_resched: beq icc0,#1,__entry_return_direct setlos #PREEMPT_ACTIVE,gr5 - sti gr5,@(gr15,#TI_FLAGS) + sti gr5,@(gr15,#TI_PRE_COUNT) andi gr23,#~PSR_PIL,gr23 movgs gr23,psr -- cgit v1.2.3-70-g09d2 From e7aa51b2e52274b13be3209e2787d1b2ce9624fd Mon Sep 17 00:00:00 2001 From: David Howells Date: Fri, 2 Nov 2012 13:20:43 +0000 Subject: FRV: Fix the new-style kernel_thread() stuff The kernel_thread() changes for FRV don't work, and FRV fails to boot, starting with: commit 02ce496f152df87be081a64796498942c433a2fd Author: Al Viro Date: Tue Sep 18 22:18:51 2012 -0400 Subject: frv: split ret_from_fork, simplify kernel_thread() a lot The problem is that the userspace registers are completely cleared when a kernel thread is created and all subsequent user threads are then copied from that. Unfortunately, however, the TBR and PSR registers are restored from the pt_regs and the values they should be set to are clobbered by the memset. Instead, copy across the old user registers as normal, and then merely alter GR8 and GR9 in it if we're going to execute a kernel thread. Signed-off-by: David Howells --- arch/frv/kernel/process.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'arch/frv') diff --git a/arch/frv/kernel/process.c b/arch/frv/kernel/process.c index e1e3aa196aa..7e33215f1d8 100644 --- a/arch/frv/kernel/process.c +++ b/arch/frv/kernel/process.c @@ -181,6 +181,9 @@ int copy_thread(unsigned long clone_flags, childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE); + /* set up the userspace frame (the only place that the USP is stored) */ + *childregs = *__kernel_frame0_ptr; + p->set_child_tid = p->clear_child_tid = NULL; p->thread.frame = childregs; @@ -191,10 +194,8 @@ int copy_thread(unsigned long clone_flags, p->thread.frame0 = childregs; if (unlikely(!regs)) { - memset(childregs, 0, sizeof(struct pt_regs)); childregs->gr9 = usp; /* function */ childregs->gr8 = arg; - childregs->psr = PSR_S; p->thread.pc = (unsigned long) ret_from_kernel_thread; save_user_regs(p->thread.user); return 0; -- cgit v1.2.3-70-g09d2 From 7b7ade117951dcc5ec947595ea7ff622fa56895e Mon Sep 17 00:00:00 2001 From: Al Viro Date: Mon, 15 Oct 2012 10:53:17 -0400 Subject: frv: switch to saner kernel_execve() semantics Signed-off-by: Al Viro --- arch/frv/Kconfig | 1 + arch/frv/include/asm/unistd.h | 1 - arch/frv/kernel/entry.S | 5 ----- 3 files changed, 1 insertion(+), 6 deletions(-) (limited to 'arch/frv') diff --git a/arch/frv/Kconfig b/arch/frv/Kconfig index b7412504f08..df2eb4bd9fa 100644 --- a/arch/frv/Kconfig +++ b/arch/frv/Kconfig @@ -13,6 +13,7 @@ config FRV select GENERIC_CPU_DEVICES select ARCH_WANT_IPC_PARSE_VERSION select GENERIC_KERNEL_THREAD + select GENERIC_KERNEL_EXECVE config ZONE_DMA bool diff --git a/arch/frv/include/asm/unistd.h b/arch/frv/include/asm/unistd.h index 266a5b25a0c..2358634cacc 100644 --- a/arch/frv/include/asm/unistd.h +++ b/arch/frv/include/asm/unistd.h @@ -30,7 +30,6 @@ #define __ARCH_WANT_SYS_RT_SIGACTION #define __ARCH_WANT_SYS_RT_SIGSUSPEND #define __ARCH_WANT_SYS_EXECVE -#define __ARCH_WANT_KERNEL_EXECVE /* * "Conditional" syscalls diff --git a/arch/frv/kernel/entry.S b/arch/frv/kernel/entry.S index d64c5262796..b1cd7e8145b 100644 --- a/arch/frv/kernel/entry.S +++ b/arch/frv/kernel/entry.S @@ -869,11 +869,6 @@ ret_from_kernel_thread: call schedule_tail calll.p @(gr21,gr0) or gr20,gr20,gr8 - bra sys_exit - - .globl ret_from_kernel_execve -ret_from_kernel_execve: - ori gr28,0,sp bra __syscall_exit ################################################################################################### -- cgit v1.2.3-70-g09d2 From 1d72d9f83df057e71c7951def41138a0230bf737 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Fri, 2 Nov 2012 12:05:44 -0400 Subject: frv: fix the broken preempt Just get %icc2 into the state we would have after local_irq_disable() and physical IRQ having happened since then. Then we can simply use preempt_schedule_irq() and be done with the whole mess. Acked-by: David Howells Signed-off-by: Al Viro --- arch/frv/kernel/entry.S | 23 +++-------------------- 1 file changed, 3 insertions(+), 20 deletions(-) (limited to 'arch/frv') diff --git a/arch/frv/kernel/entry.S b/arch/frv/kernel/entry.S index b1cd7e8145b..dfcd263c051 100644 --- a/arch/frv/kernel/entry.S +++ b/arch/frv/kernel/entry.S @@ -1075,27 +1075,10 @@ __entry_return_from_kernel_interrupt: subicc gr5,#0,gr0,icc0 beq icc0,#0,__entry_return_direct -__entry_preempt_need_resched: - ldi @(gr15,#TI_FLAGS),gr4 - andicc gr4,#_TIF_NEED_RESCHED,gr0,icc0 - beq icc0,#1,__entry_return_direct - - setlos #PREEMPT_ACTIVE,gr5 - sti gr5,@(gr15,#TI_PRE_COUNT) - - andi gr23,#~PSR_PIL,gr23 - movgs gr23,psr - - call schedule - sti gr0,@(gr15,#TI_PRE_COUNT) - - movsg psr,gr23 - ori gr23,#PSR_PIL_14,gr23 - movgs gr23,psr - bra __entry_preempt_need_resched -#else - bra __entry_return_direct + subcc gr0,gr0,gr0,icc2 /* set Z and clear C */ + call preempt_schedule_irq #endif + bra __entry_return_direct ############################################################################### -- cgit v1.2.3-70-g09d2