This is a note to let you know that I've just added the patch titled parisc: Fix set_fixmap() on PA1.x CPUs to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: parisc-fix-set_fixmap-on-pa1.x-cpus.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 6e866a462867b60841202e900f10936a0478608c Mon Sep 17 00:00:00 2001 From: Helge Deller <deller@xxxxxx> Date: Sun, 31 Oct 2021 21:58:12 +0100 Subject: parisc: Fix set_fixmap() on PA1.x CPUs From: Helge Deller <deller@xxxxxx> commit 6e866a462867b60841202e900f10936a0478608c upstream. Fix a kernel crash which happens on PA1.x CPUs while initializing the FTRACE/KPROBE breakpoints. The PTE table entries for the fixmap area were not created correctly. Signed-off-by: Helge Deller <deller@xxxxxx> Fixes: ccfbc68d41c2 ("parisc: add set_fixmap()/clear_fixmap()") Cc: stable@xxxxxxxxxxxxxxx # v5.2+ Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/parisc/mm/fixmap.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) --- a/arch/parisc/mm/fixmap.c +++ b/arch/parisc/mm/fixmap.c @@ -18,12 +18,9 @@ void notrace set_fixmap(enum fixed_addre pte_t *pte; if (pmd_none(*pmd)) - pmd = pmd_alloc(NULL, pgd, vaddr); - - pte = pte_offset_kernel(pmd, vaddr); - if (pte_none(*pte)) pte = pte_alloc_kernel(pmd, vaddr); + pte = pte_offset_kernel(pmd, vaddr); set_pte_at(&init_mm, vaddr, pte, __mk_pte(phys, PAGE_KERNEL_RWX)); flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE); } Patches currently in stable-queue which might be from deller@xxxxxx are queue-5.4/parisc-fix-ptrace-check-on-syscall-return.patch queue-5.4/task_stack-fix-end_of_stack-for-architectures-with-u.patch queue-5.4/parisc-kgdb-add-kgdb_roundup-to-make-kgdb-work-with-.patch queue-5.4/parisc-fix-set_fixmap-on-pa1.x-cpus.patch queue-5.4/parisc-fix-warning-in-flush_tlb_all.patch queue-5.4/parisc-fix-backtrace-to-always-include-init-funtion-names.patch queue-5.4/parisc-unwind-fix-unwinder-when-config_64bit-is-enab.patch