kernel.git/arch/parisc/kernel, branch linux-6.4.y

parisc: Fix /proc/cpuinfo output for lscpu

2023-09-13T07:48:41Z

commit 9f5ba4b3e1b3c123eeca5d2d09161e8720048b5c upstream. The lscpu command is broken since commit cab56b51ec0e ("parisc: Fix device names in /proc/iomem") added the PA pathname to all PA devices, includig the CPUs. lscpu parses /proc/cpuinfo and now believes it found different CPU types since every CPU is listed with an unique identifier (PA pathname). Fix this problem by simply dropping the PA pathname when listing the CPUs in /proc/cpuinfo. There is no need to show the pathname in this procfs file. Fixes: cab56b51ec0e ("parisc: Fix device names in /proc/iomem") Signed-off-by: Helge Deller Cc: # v4.9+ Signed-off-by: Greg Kroah-Hartman

parisc: sys_parisc: parisc_personality() is called from asm code

2023-09-02T07:14:38Z

commit b5d89408b9fb21258f7c371d6d48a674f60f7181 upstream. Signed-off-by: Helge Deller Signed-off-by: Greg Kroah-Hartman

parisc: Fix CONFIG_TLB_PTLOCK to work with lightweight spinlock checks

2023-08-23T15:32:52Z

commit 7a894c87374771f3cfb1b8e5453fbe03f1fb8135 upstream. For the TLB_PTLOCK checks we used an optimization to store the spc register into the spinlock to unlock it. This optimization works as long as the lightweight spinlock checks (CONFIG_LIGHTWEIGHT_SPINLOCK_CHECK) aren't enabled, because they really check if the lock word is zero or __ARCH_SPIN_LOCK_UNLOCKED_VAL and abort with a kernel crash ("Spinlock was trashed") otherwise. Drop that optimization to make it possible to activate both checks at the same time. Noticed-by: Sam James Signed-off-by: Helge Deller Tested-by: Sam James Cc: stable@vger.kernel.org # v6.4+ Fixes: 15e64ef6520e ("parisc: Add lightweight spinlock checks") Signed-off-by: Greg Kroah-Hartman

parisc: Fix lightweight spinlock checks to not break futexes

2023-08-16T16:32:18Z

commit a0f4b7879f2e14986200747d1b545e5daac8c624 upstream. The lightweight spinlock checks verify that a spinlock has either value 0 (spinlock locked) and that not any other bits than in __ARCH_SPIN_LOCK_UNLOCKED_VAL is set. This breaks the current LWS code, which writes the address of the lock into the lock word to unlock it, which was an optimization to save one assembler instruction. Fix it by making spinlock_types.h accessible for asm code, change the LWS spinlock-unlocking code to write __ARCH_SPIN_LOCK_UNLOCKED_VAL into the lock word, and add some missing lightweight spinlock checks to the LWS path. Finally, make the spinlock checks dependend on DEBUG_KERNEL. Noticed-by: John David Anglin Signed-off-by: Helge Deller Tested-by: John David Anglin Cc: stable@vger.kernel.org # v6.4+ Fixes: 15e64ef6520e ("parisc: Add lightweight spinlock checks") Signed-off-by: Greg Kroah-Hartman

io_uring/parisc: Adjust pgoff in io_uring mmap() for parisc

2023-08-16T16:32:17Z

commit 56675f8b9f9b15b024b8e3145fa289b004916ab7 upstream. The changes from commit 32832a407a71 ("io_uring: Fix io_uring mmap() by using architecture-provided get_unmapped_area()") to the parisc implementation of get_unmapped_area() broke glibc's locale-gen executable when running on parisc. This patch reverts those architecture-specific changes, and instead adjusts in io_uring_mmu_get_unmapped_area() the pgoff offset which is then given to parisc's get_unmapped_area() function. This is much cleaner than the previous approach, and we still will get a coherent addresss. This patch has no effect on other architectures (SHM_COLOUR is only defined on parisc), and the liburing testcase stil passes on parisc. Cc: stable@vger.kernel.org # 6.4 Signed-off-by: Helge Deller Reported-by: Christoph Biedl Fixes: 32832a407a71 ("io_uring: Fix io_uring mmap() by using architecture-provided get_unmapped_area()") Fixes: d808459b2e31 ("io_uring: Adjust mapping wrt architecture aliasing requirements") Link: https://lore.kernel.org/r/ZNEyGV0jyI8kOOfz@p100 Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman

io_uring: Fix io_uring mmap() by using architecture-provided get_unmapped_area()

2023-07-27T06:56:31Z

commit 32832a407a7178eec3215fad9b1a3298c14b0d69 upstream. The io_uring testcase is broken on IA-64 since commit d808459b2e31 ("io_uring: Adjust mapping wrt architecture aliasing requirements"). The reason is, that this commit introduced an own architecture independend get_unmapped_area() search algorithm which finds on IA-64 a memory region which is outside of the regular memory region used for shared userspace mappings and which can't be used on that platform due to aliasing. To avoid similar problems on IA-64 and other platforms in the future, it's better to switch back to the architecture-provided get_unmapped_area() function and adjust the needed input parameters before the call. Beside fixing the issue, the function now becomes easier to understand and maintain. This patch has been successfully tested with the io_uring testcase on physical x86-64, ppc64le, IA-64 and PA-RISC machines. On PA-RISC the LTP mmmap testcases did not report any regressions. Cc: stable@vger.kernel.org # 6.4 Signed-off-by: Helge Deller Reported-by: matoro Fixes: d808459b2e31 ("io_uring: Adjust mapping wrt architecture aliasing requirements") Link: https://lore.kernel.org/r/20230721152432.196382-2-deller@gmx.de Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman

parisc: Fix flush_dcache_page() for usage from irq context

2023-05-24T17:03:49Z

Since at least kernel 6.1, flush_dcache_page() is called with IRQs disabled, e.g. from aio_complete(). But the current implementation for flush_dcache_page() on parisc unintentionally re-enables IRQs, which may lead to deadlocks. Fix it by using xa_lock_irqsave() and xa_unlock_irqrestore() for the flush_dcache_mmap_*lock() macros instead. Cc: linux-parisc@vger.kernel.org Cc: stable@kernel.org # 5.18+ Signed-off-by: Helge Deller

parisc: Handle kgdb breakpoints only in kernel context

2023-05-24T13:46:12Z

The kernel kgdb break instructions should only be handled when running in kernel context. Cc: # v5.4+ Signed-off-by: Helge Deller

parisc: Handle kprobes breakpoints only in kernel context

2023-05-24T13:46:12Z

The kernel kprobes break instructions should only be handled when running in kernel context. Cc: # v5.18+ Signed-off-by: Helge Deller

parisc: Allow to reboot machine after system halt

2023-05-24T13:46:12Z

In case a machine can't power-off itself on system shutdown, allow the user to reboot it by pressing the RETURN key. Cc: # v4.14+ Signed-off-by: Helge Deller