kernel.git/arch/openrisc, branch linux-4.14.y

exit: Add and use make_task_dead.

2023-02-06T06:46:33Z

commit 0e25498f8cd43c1b5aa327f373dd094e9a006da7 upstream. There are two big uses of do_exit. The first is it's design use to be the guts of the exit(2) system call. The second use is to terminate a task after something catastrophic has happened like a NULL pointer in kernel code. Add a function make_task_dead that is initialy exactly the same as do_exit to cover the cases where do_exit is called to handle catastrophic failure. In time this can probably be reduced to just a light wrapper around do_task_dead. For now keep it exactly the same so that there will be no behavioral differences introducing this new concept. Replace all of the uses of do_exit that use it for catastraphic task cleanup with make_task_dead to make it clear what the code is doing. As part of this rename rewind_stack_do_exit rewind_stack_and_make_dead. Signed-off-by: "Eric W. Biederman" Signed-off-by: Eric Biggers Signed-off-by: Greg Kroah-Hartman

openrisc: start CPU timer early in boot

2022-06-14T14:53:45Z

[ Upstream commit 516dd4aacd67a0f27da94f3fe63fe0f4dbab6e2b ] In order to measure the boot process, the timer should be switched on as early in boot as possible. As well, the commit defines the get_cycles macro, like the previous patches in this series, so that generic code is aware that it's implemented by the platform, as is done on other archs. Cc: Thomas Gleixner Cc: Arnd Bergmann Cc: Jonas Bonn Cc: Stefan Kristiansson Acked-by: Stafford Horne Reported-by: Guenter Roeck Signed-off-by: Jason A. Donenfeld Signed-off-by: Sasha Levin

openrisc: don't printk() unconditionally

2021-09-22T09:45:26Z

[ Upstream commit 946e1052cdcc7e585ee5d1e72528ca49fb295243 ] Don't call printk() when CONFIG_PRINTK is not set. Fixes the following build errors: or1k-linux-ld: arch/openrisc/kernel/entry.o: in function `_external_irq_handler': (.text+0x804): undefined reference to `printk' (.text+0x804): relocation truncated to fit: R_OR1K_INSN_REL_26 against undefined symbol `printk' Fixes: 9d02a4283e9c ("OpenRISC: Boot code") Signed-off-by: Randy Dunlap Reported-by: kernel test robot Cc: Jonas Bonn Cc: Stefan Kristiansson Cc: Stafford Horne Cc: openrisc@lists.librecores.org Signed-off-by: Stafford Horne Signed-off-by: Sasha Levin

openrisc: Define memory barrier mb

2021-06-03T06:36:22Z

[ Upstream commit 8b549c18ae81dbc36fb11e4aa08b8378c599ca95 ] This came up in the discussion of the requirements of qspinlock on an architecture. OpenRISC uses qspinlock, but it was noticed that the memmory barrier was not defined. Peter defined it in the mail thread writing: As near as I can tell this should do. The arch spec only lists this one instruction and the text makes it sound like a completion barrier. This is correct so applying this patch. Signed-off-by: Peter Zijlstra [shorne@gmail.com:Turned the mail into a patch] Signed-off-by: Stafford Horne Signed-off-by: Sasha Levin

openrisc: Fix a memory leak

2021-05-26T09:46:58Z

[ Upstream commit c019d92457826bb7b2091c86f36adb5de08405f9 ] 'setup_find_cpu_node()' take a reference on the node it returns. This reference must be decremented when not needed anymore, or there will be a leak. Add the missing 'of_node_put(cpu)'. Note that 'setup_cpuinfo()' that also calls this function already has a correct 'of_node_put(cpu)' at its end. Fixes: 9d02a4283e9c ("OpenRISC: Boot code") Signed-off-by: Christophe JAILLET Signed-off-by: Stafford Horne Signed-off-by: Sasha Levin

openrisc: Fix issue with argument clobbering for clone/fork

2020-06-25T13:41:56Z

[ Upstream commit 6bd140e14d9aaa734ec37985b8b20a96c0ece948 ] Working on the OpenRISC glibc port I found that sometimes clone was working strange. That the tls data argument sent in r7 was always wrong. Further investigation revealed that the arguments were getting clobbered in the entry code. This patch removes the code that writes to the argument registers. This was likely due to some old code hanging around. This patch fixes this up for clone and fork. This fork clobber is harmless but also useless so remove. Signed-off-by: Stafford Horne Signed-off-by: Sasha Levin

arch/openrisc: Fix issues with access_ok()

2020-06-20T08:24:58Z

commit 9cb2feb4d21d97386eb25c7b67e2793efcc1e70a upstream. The commit 594cc251fdd0 ("make 'user_access_begin()' do 'access_ok()'") exposed incorrect implementations of access_ok() macro in several architectures. This change fixes 2 issues found in OpenRISC. OpenRISC was not properly using parenthesis for arguments and also using arguments twice. This patch fixes those 2 issues. I test booted this patch with v5.0-rc1 on qemu and it's working fine. Cc: Guenter Roeck Cc: Linus Torvalds Reported-by: Linus Torvalds Signed-off-by: Stafford Horne Signed-off-by: Linus Torvalds Signed-off-by: Miles Chen Signed-off-by: Greg Kroah-Hartman

openrisc: Fix broken paths to arch/or32

2019-12-05T14:37:38Z

[ Upstream commit 57ce8ba0fd3a95bf29ed741df1c52bd591bf43ff ] OpenRISC was mainlined as "openrisc", not "or32". vmlinux.lds is generated from vmlinux.lds.S. Signed-off-by: Geert Uytterhoeven Signed-off-by: Stafford Horne Signed-off-by: Sasha Levin

openrisc: entry: Fix delay slot exception detection

2018-08-24T11:09:11Z

[ Upstream commit ae15a41a641449f536578b0d9ec0e4ade130deb5 ] Originally in patch e6d20c55a4 ("openrisc: entry: Fix delay slot detection") I fixed delay slot detection, but only for QEMU. We missed that hardware delay slot detection using delay slot exception flag (DSX) was still broken. This was because QEMU set the DSX flag in both pre-exception supervision register (ESR) and supervision register (SR) register, but on real hardware the DSX flag is only set on the SR register during exceptions. Fix this by carrying the DSX flag into the SR register during exception. We also update the DSX flag read locations to read the value from the SR register not the pt_regs SR register which represents ESR. The ESR should never have the DSX flag set. In the process I updated/removed a few comments to match the current state. Including removing a comment saying that the DSX detection logic was inefficient and needed to be rewritten. I have tested this on QEMU with a patch ensuring it matches the hardware specification. Link: https://lists.gnu.org/archive/html/qemu-devel/2018-07/msg00000.html Fixes: e6d20c55a4 ("openrisc: entry: Fix delay slot detection") Signed-off-by: Stafford Horne Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

kmemcheck: remove annotations

2018-02-22T14:42:23Z

commit 4950276672fce5c241857540f8561c440663673d upstream. Patch series "kmemcheck: kill kmemcheck", v2. As discussed at LSF/MM, kill kmemcheck. KASan is a replacement that is able to work without the limitation of kmemcheck (single CPU, slow). KASan is already upstream. We are also not aware of any users of kmemcheck (or users who don't consider KASan as a suitable replacement). The only objection was that since KASAN wasn't supported by all GCC versions provided by distros at that time we should hold off for 2 years, and try again. Now that 2 years have passed, and all distros provide gcc that supports KASAN, kill kmemcheck again for the very same reasons. This patch (of 4): Remove kmemcheck annotations, and calls to kmemcheck from the kernel. [alexander.levin@verizon.com: correctly remove kmemcheck call from dma_map_sg_attrs] Link: http://lkml.kernel.org/r/20171012192151.26531-1-alexander.levin@verizon.com Link: http://lkml.kernel.org/r/20171007030159.22241-2-alexander.levin@verizon.com Signed-off-by: Sasha Levin Cc: Alexander Potapenko Cc: Eric W. Biederman Cc: Michal Hocko Cc: Pekka Enberg Cc: Steven Rostedt Cc: Tim Hansen Cc: Vegard Nossum Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman