From cbade823342cd013f1fbd46f6e3b74825fecbc16 Mon Sep 17 00:00:00 2001 From: Helge Deller Date: Sun, 21 Jul 2024 23:36:36 +0200 Subject: [PATCH] parisc: Add support for CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN Allow users to disable kernel warnings for unaligned memory accesses from kernel via the /proc/sys/kernel/ignore-unaligned-usertrap procfs entry. That way users can disable those warnings in case they happen too often. Signed-off-by: Helge Deller --- Documentation/admin-guide/sysctl/kernel.rst | 2 +- arch/parisc/Kconfig | 1 + arch/parisc/kernel/unaligned.c | 2 ++ 3 files changed, 4 insertions(+), 1 deletion(-) diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst index 7fd43947832f..f8bc1630eba0 100644 --- a/Documentation/admin-guide/sysctl/kernel.rst +++ b/Documentation/admin-guide/sysctl/kernel.rst @@ -454,7 +454,7 @@ ignore-unaligned-usertrap On architectures where unaligned accesses cause traps, and where this feature is supported (``CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN``; -currently, ``arc`` and ``loongarch``), controls whether all +currently, ``arc``, ``parisc`` and ``loongarch``), controls whether all unaligned traps are logged. = ============================================================= diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig index 50735f3a772c..d815af5f1aeb 100644 --- a/arch/parisc/Kconfig +++ b/arch/parisc/Kconfig @@ -45,6 +45,7 @@ config PARISC select GENERIC_CPU_DEVICES if !SMP select GENERIC_LIB_DEVMEM_IS_ALLOWED select SYSCTL_ARCH_UNALIGN_ALLOW + select SYSCTL_ARCH_UNALIGN_NO_WARN select SYSCTL_EXCEPTION_TRACE select HAVE_MOD_ARCH_SPECIFIC select MODULES_USE_ELF_RELA diff --git a/arch/parisc/kernel/unaligned.c b/arch/parisc/kernel/unaligned.c index 71e596ca5a86..3e79e40e361d 100644 --- a/arch/parisc/kernel/unaligned.c +++ b/arch/parisc/kernel/unaligned.c @@ -104,6 +104,7 @@ #define ERR_NOTHANDLED -1 int unaligned_enabled __read_mostly = 1; +int no_unaligned_warning __read_mostly; static int emulate_ldh(struct pt_regs *regs, int toreg) { @@ -399,6 +400,7 @@ void handle_unaligned(struct pt_regs *regs) } else { static DEFINE_RATELIMIT_STATE(kernel_ratelimit, 5 * HZ, 5); if (!(current->thread.flags & PARISC_UAC_NOPRINT) && + !no_unaligned_warning && __ratelimit(&kernel_ratelimit)) pr_warn("Kernel: unaligned access to " RFMT " in %pS " "(iir " RFMT ")\n",