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* [PATCH] parisc: Avoid spurious inequivalent alias kernel error messages
@ 2019-11-02 16:43 John David Anglin
  0 siblings, 0 replies; only message in thread
From: John David Anglin @ 2019-11-02 16:43 UTC (permalink / raw)
  To: linux-parisc; +Cc: Helge Deller, James Bottomley

This patch changes flush_dcache_page() to only print inequivalent alias error messages
on systems that require coherency.  Inequivalent aliases can occur on systems that don't
require coherency and this can cause spurious messages.

Signed-off-by: John David Anglin <>
 arch/parisc/kernel/cache.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index a82b3eaa5398..2407b0b789d3 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -365,7 +365,7 @@ void flush_dcache_page(struct page *page)
 		if (old_addr == 0 || (old_addr & (SHM_COLOUR - 1))
 				      != (addr & (SHM_COLOUR - 1))) {
 			__flush_cache_page(mpnt, addr, page_to_phys(page));
-			if (old_addr)
+			if (parisc_requires_coherency() && old_addr)
 				printk(KERN_ERR "INEQUIVALENT ALIASES 0x%lx and 0x%lx in file %pD\n", old_addr, addr, mpnt->vm_file);
 			old_addr = addr;

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2019-11-02 16:43 [PATCH] parisc: Avoid spurious inequivalent alias kernel error messages John David Anglin

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