crash/0012-ppc64-Remove-redundant-PTE-checks.patch

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From 8b24b2025fb4ae9bd6102bb054bd23987c35387e Mon Sep 17 00:00:00 2001
From: Likhitha Korrapati <likhitha@linux.ibm.com>
Date: Fri, 16 Jun 2023 17:25:19 +0530
Subject: [PATCH 12/30] ppc64: Remove redundant PTE checks
Remove redundant checks for PTE (Page Table Entry) because those
conditions are already covered.
if (!(pte & _PAGE_PRESENT)) {
...
return FALSE;
}
if (!pte)
return FALSE;
The second pte check is redundant because it holds true only when pte is
0. If pte is 0 then (!(pte & _PAGE_PRESENT)) is true and it will return
false. So there is no need for one more pte check.
Signed-off-by: Likhitha Korrapati <likhitha@linux.ibm.com>
Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
---
ppc64.c | 6 ------
1 file changed, 6 deletions(-)
diff --git a/ppc64.c b/ppc64.c
index b95a621d8fe4..fc34006f4863 100644
--- a/ppc64.c
+++ b/ppc64.c
@@ -968,9 +968,6 @@ ppc64_vtop(ulong vaddr, ulong *pgd, physaddr_t *paddr, int verbose)
return FALSE;
}
- if (!pte)
- return FALSE;
-
*paddr = PAGEBASE(PTOB(pte >> PTE_RPN_SHIFT_DEFAULT)) + PAGEOFFSET(vaddr);
if (verbose) {
@@ -1077,9 +1074,6 @@ ppc64_vtop_level4(ulong vaddr, ulong *level4, physaddr_t *paddr, int verbose)
return FALSE;
}
- if (!pte)
- return FALSE;
-
out:
if (hugepage_type) {
if (hugepage_type == 2) {
--
2.37.1