Patch "MIPS: Fix mips_atomic_set() retry condition" has been added to the 4.4-stable tree
Subsystems (2)
This is a note to let you know that I've just added the patch titled
MIPS: Fix mips_atomic_set() retry condition
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-fix-mips_atomic_set-retry-condition.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 <[email protected]> know about it.
Quoted 1 line
From
2ec420b26f7b6ff332393f0bb5a7d245f7ad87f0Mon Sep 17 00:00:00 2001
From: James Hogan <[email protected]>
Date: Wed, 31 May 2017 16:19:47 +0100
Subject: MIPS: Fix mips_atomic_set() retry condition
From: James Hogan <[email protected]>
commit 2ec420b26f7b6ff332393f0bb5a7d245f7ad87f0 upstream.
The inline asm retry check in the MIPS_ATOMIC_SET operation of the sysmips system call has been backwards since commit f1e39a4a616c ("MIPS:
Rewrite sysmips(MIPS_ATOMIC_SET, ...) in C with inline assembler") merged in v2.6.32, resulting in the non R10000_LLSC_WAR case retrying until the operation was inatomic, before returning the new value that was probably just written multiple times instead of the old value.
Invert the branch condition to fix that particular issue.
Patchwork: https://patchwork.linux-mips.org/patch/16148/
--- arch/mips/kernel/syscall.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
arch/mips/kernel/syscall.c +1 -1
@@ -141,7 +141,7 @@ static inline int mips_atomic_set(unsign"1: ll %[old], (%[addr]) \n" " move %[tmp], %[new] \n" "2: sc %[tmp], (%[addr]) \n" -" bnez %[tmp], 4f \n" +" beqz %[tmp], 4f \n" "3: \n" " .insn \n" " .subsection 2 \n"
Patches currently in stable-queue which might be from [email protected] are
queue-4.4/mips-send-sigill-for-bposge32-in-__compute_return_epc_for_insn.patch queue-4.4/mips-actually-decode-jalx-in-__compute_return_epc_for_insn.patch queue-4.4/mips-fix-mips_atomic_set-retry-condition.patch queue-4.4/mips-fix-a-typo-s-preset-present-in-r2-to-r6-emulation-error-message.patch queue-4.4/mips-fix-mips_atomic_set-with-eva.patch queue-4.4/mips-save-static-registers-before-sysmips.patch queue-4.4/mips-fix-unaligned-pc-interpretation-in-compute_return_epc.patch queue-4.4/mips-fix-mips-i-isa-proc-cpuinfo-reporting.patch queue-4.4/mips-rename-sigill_r6-to-sigill_r2r6-in-__compute_return_epc_for_insn.patch queue-4.4/mips-negate-error-syscall-return-in-trace.patch queue-4.4/mips-send-sigill-for-linked-branches-in-__compute_return_epc_for_insn.patch queue-4.4/mips-math-emu-prevent-wrong-isa-mode-instruction-emulation.patch