These patches fix a few issues with the sysmips(MIPS_ATOMIC_SET, ...) system call. This system call is pretty much deprecated and no longer used by glibc, however it is still provided for compatibility so we should keep it working. Patch 1 fixes a longstanding broken atomic retry condition which results in the loop retrying until the the operation was *NOT* atomic: - The new (instead of old) value will usually be returned. - If the operation fails first time it won't be repeated (otherwise it'll repeat until it does fail, which is slow). Patch 2 fixes a similarly longstanding clobbering of callee saved registers in the common path, which tends to crash userland soon afterwards. Patch 3 fixes an EVA specific issue where normal LL/SC instructions are used instead of the EVA specific LLE/SCE instructions. Finally patch 4 simplifies the assembly slightly to avoid the apparently redundant branch via a subsection. If anybody knows why this was there and whether it is still needed I'm all ears. This is the only patch not tagged for stable. Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx> Cc: linux-mips@xxxxxxxxxxxxxx Cc: stable@xxxxxxxxxxxxxxx James Hogan (4): MIPS: Fix mips_atomic_set() retry condition MIPS: Save static registers before sysmips MIPS: Fix mips_atomic_set() with EVA MIPS: Branch straight to ll in mips_atomic_set() arch/mips/kernel/scall32-o32.S | 2 +- arch/mips/kernel/scall64-64.S | 2 +- arch/mips/kernel/scall64-n32.S | 2 +- arch/mips/kernel/scall64-o32.S | 2 +- arch/mips/kernel/syscall.c | 19 ++++++++++++------- 5 files changed, 16 insertions(+), 11 deletions(-) -- git-series 0.8.10
