* [PATCH] parisc: Add memory barrier to asm pdc and sync instructions
@ 2019-04-27 21:57 Helge Deller
0 siblings, 0 replies; only message in thread
From: Helge Deller @ 2019-04-27 21:57 UTC (permalink / raw)
To: linux-parisc, James Bottomley, John David Anglin
Add compiler memory barriers to ensure the compiler doesn't reorder memory
operations around these instructions.
Cc: stable@vger.kernel.org # v4.20+
Fixes: 3847dab77421 ("parisc: Add alternative coding infrastructure")
Signed-off-by: Helge Deller <deller@gmx.de>
diff --git a/arch/parisc/include/asm/cache.h b/arch/parisc/include/asm/cache.h
index c18351cf5876..4016fe1c65a9 100644
--- a/arch/parisc/include/asm/cache.h
+++ b/arch/parisc/include/asm/cache.h
@@ -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__ */
^ permalink raw reply related [flat|nested] only message in thread
only message in thread, other threads:[~2019-04-27 21:58 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-04-27 21:57 [PATCH] parisc: Add memory barrier to asm pdc and sync instructions Helge Deller
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).