diff mbox series

parisc: Add support for CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN

Message ID 20240721214028.22180-1-deller@kernel.org (mailing list archive)
State Accepted, archived
Headers show
Series parisc: Add support for CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN | expand

Commit Message

Helge Deller July 21, 2024, 9:40 p.m. UTC 
From: Helge Deller <deller@gmx.de>

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@gmx.de>
---
 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 mbox series

Patch

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",