This is a note to let you know that I've just added the patch titled MIPS: math-emu: Remove pr_err() calls from fpu_emu() to the 4.4-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: mips-math-emu-remove-pr_err-calls-from-fpu_emu.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From ca8eb05b5f332a9e1ab3e2ece498d49f4d683470 Mon Sep 17 00:00:00 2001 From: Paul Burton <paul.burton@xxxxxxxxxx> Date: Fri, 8 Sep 2017 15:12:21 -0700 Subject: MIPS: math-emu: Remove pr_err() calls from fpu_emu() From: Paul Burton <paul.burton@xxxxxxxxxx> commit ca8eb05b5f332a9e1ab3e2ece498d49f4d683470 upstream. The FPU emulator includes 2 calls to pr_err() which are triggered by invalid instruction encodings for MIPSr6 cmp.cond.fmt instructions. These cases are not kernel errors, merely invalid instructions which are already handled by delivering a SIGILL which will provide notification that something failed in cases where that makes sense. In cases where that SIGILL is somewhat expected & being handled, for example when crashme happens to generate one of the affected bad encodings, the message is printed with no useful context about what triggered it & spams the kernel log for no good reason. Remove the pr_err() calls to make crashme run silently & treat the bad encodings the same way we do others, with a SIGILL & no further kernel log output. Signed-off-by: Paul Burton <paul.burton@xxxxxxxxxx> Fixes: f8c3c6717a71 ("MIPS: math-emu: Add support for the CMP.condn.fmt R6 instruction") Cc: linux-mips@xxxxxxxxxxxxxx Patchwork: https://patchwork.linux-mips.org/patch/17253/ Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/mips/math-emu/cp1emu.c | 2 -- 1 file changed, 2 deletions(-) --- a/arch/mips/math-emu/cp1emu.c +++ b/arch/mips/math-emu/cp1emu.c @@ -2360,7 +2360,6 @@ dcopuop: break; default: /* Reserved R6 ops */ - pr_err("Reserved MIPS R6 CMP.condn.S operation\n"); return SIGILL; } } @@ -2434,7 +2433,6 @@ dcopuop: break; default: /* Reserved R6 ops */ - pr_err("Reserved MIPS R6 CMP.condn.D operation\n"); return SIGILL; } } Patches currently in stable-queue which might be from paul.burton@xxxxxxxxxx are queue-4.4/mips-math-emu-remove-pr_err-calls-from-fpu_emu.patch