Commit cbade823 authored by Helge Deller's avatar Helge Deller
Browse files

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: default avatarHelge Deller <deller@gmx.de>
parent 2fd4e52e

Documentation/admin-guide/sysctl/kernel.rst

+1 −1
Original line number Diff line number Diff line
@@ -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.



= =============================================================

arch/parisc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/parisc/kernel/unaligned.c

+2 −0
Original line number Diff line number Diff line
@@ -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",