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Commit 2d94a832 authored by Helge Deller's avatar Helge Deller
Browse files

parisc: Add memory barrier to asm pdc and sync instructions 



Add compiler memory barriers to ensure the compiler doesn't reorder memory
operations around these instructions.

Cc: stable@vger.kernel.org # v4.20+
Fixes: 3847dab7 ("parisc: Add alternative coding infrastructure")
Signed-off-by: default avatarHelge Deller <deller@gmx.de>
parent 44224bdb

arch/parisc/include/asm/cache.h

+2 −2
Original line number Diff line number Diff line
@@ -56,10 +56,10 @@ void parisc_setup_cache_timing(void); 
#define asm_io_fdc(addr) asm volatile("fdc %%r0(%0)" \

			ALTERNATIVE(ALT_COND_NO_DCACHE, INSN_NOP) \

			ALTERNATIVE(ALT_COND_NO_IOC_FDC, INSN_NOP) \

			: : "r" (addr))

			: : "r" (addr) : "memory")

#define asm_io_sync()	asm volatile("sync" \

			ALTERNATIVE(ALT_COND_NO_DCACHE, INSN_NOP) \

			ALTERNATIVE(ALT_COND_NO_IOC_FDC, INSN_NOP) :: )

			ALTERNATIVE(ALT_COND_NO_IOC_FDC, INSN_NOP) :::"memory")



#endif /* ! __ASSEMBLY__ */