From: Helge Deller <deller@xxxxxx>
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 <deller@xxxxxx>
---
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",
--
2.45.2
