Commit 7049b323 authored by Helge Deller's avatar Helge Deller Committed by Greg Kroah-Hartman

parisc: Add memory barrier to asm pdc and sync instructions

commit 2d94a832 upstream.

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>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e7be05c8
......@@ -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__ */
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment