linux-kernel - [PATCH v1 01/27] powerpc/mm: Don't BUG() in hugepd

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Date:   Wed, 20 Mar 2019 10:06:36 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        aneesh.kumar@...ux.ibm.com
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v1 01/27] powerpc/mm: Don't BUG() in hugepd_page()

Don't BUG(), just warn and return NULL.
If the NULL value is not handled, it will get catched anyway.

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/include/asm/hugetlb.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/hugetlb.h b/arch/powerpc/include/asm/hugetlb.h
index 8d40565ad0c3..48c29686c78e 100644
--- a/arch/powerpc/include/asm/hugetlb.h
+++ b/arch/powerpc/include/asm/hugetlb.h
@@ -14,7 +14,8 @@
  */
 static inline pte_t *hugepd_page(hugepd_t hpd)
 {
-	BUG_ON(!hugepd_ok(hpd));
+	if (WARN_ON(!hugepd_ok(hpd)))
+		return NULL;
 	/*
 	 * We have only four bits to encode, MMU page size
 	 */
@@ -42,7 +43,8 @@ static inline void flush_hugetlb_page(struct vm_area_struct *vma,
 
 static inline pte_t *hugepd_page(hugepd_t hpd)
 {
-	BUG_ON(!hugepd_ok(hpd));
+	if (WARN_ON(!hugepd_ok(hpd)))
+		return NULL;
 #ifdef CONFIG_PPC_8xx
 	return (pte_t *)__va(hpd_val(hpd) & ~HUGEPD_SHIFT_MASK);
 #else
-- 
2.13.3