Commit 203e090a authored May 31, 2017 by James Hogan Committed by Ralf Baechle Jun 28, 2017

MIPS: Branch straight to ll in mips_atomic_set()



Adjust the atomic loop in the MIPS_ATOMIC_SET operation of the sysmips
system call to branch straight back to the linked load rather than
jumping via a different subsection (whose purpose remains a mystery to
me).

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16150/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

parent 4915e1b0

arch/mips/kernel/syscall.c

+1 −5

Original line number	Diff line number	Diff line
		@@ -137,13 +137,9 @@ static inline int mips_atomic_set(unsigned long addr, unsigned long new)
		" move %[tmp], %[new] \n"
		"2: \n"
		user_sc("%[tmp]", "(%[addr])")
		" beqz %[tmp], 4f \n"
		" beqz %[tmp], 1b \n"
		"3: \n"
		" .insn \n"
		" .subsection 2 \n"
		"4: b 1b \n"
		" .previous \n"
		" \n"
		" .section .fixup,\"ax\" \n"
		"5: li %[err], %[efault] \n"
		" j 3b \n"