From 80ec183214e8bf815ecff8f58d82d67b9842a8de Mon Sep 17 00:00:00 2001 From: bob picco Date: Fri, 10 Mar 2017 14:31:19 -0500 Subject: [PATCH] sparc64: kern_addr_valid regression [ Upstream commit adfae8a5d833fa2b46577a8081f350e408851f5b ] I encountered this bug when using /proc/kcore to examine the kernel. Plus a coworker inquired about debugging tools. We computed pa but did not use it during the maximum physical address bits test. Instead we used the identity mapped virtual address which will always fail this test. I believe the defect came in here: [bpicco@zareason linus.git]$ git describe --contains bb4e6e85daa52 v3.18-rc1~87^2~4 . Signed-off-by: Bob Picco Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- arch/sparc/mm/init_64.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index 3d3414c14792..965655afdbb6 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -1493,7 +1493,7 @@ bool kern_addr_valid(unsigned long addr) if ((long)addr < 0L) { unsigned long pa = __pa(addr); - if ((addr >> max_phys_bits) != 0UL) + if ((pa >> max_phys_bits) != 0UL) return false; return pfn_valid(pa >> PAGE_SHIFT); -- 2.34.1