[PATCH v1 1/9] powerpc/vdso: Remove BUG_ON() in vdso_init()

[Christophe Leroy]

If we are not able to allocate memory for the pagelists, bail out.

There is no reason to crash the machine, just have vdso init fail.

Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>
---
This series is based on top of the series switching to C VDSO implementation,
but in fact only the last patch depends on that series and is not vital as
it is just afterwork cleanup.

Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>
---
 arch/powerpc/kernel/vdso.c | 27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index 23208a051af5..88a4a02ed4c4 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -747,20 +747,16 @@ static int __init vdso_init(void)
         * Initialize the vDSO images in memory, that is do necessary
         * fixups of vDSO symbols, locate trampolines, etc...
         */
-       if (vdso_setup()) {
-               printk(KERN_ERR "vDSO setup failure, not enabled !\n");
-               vdso32_pages = 0;
-#ifdef CONFIG_PPC64
-               vdso64_pages = 0;
-#endif
-               return 0;
-       }
+       if (vdso_setup())
+               goto setup_failed;
 
 #ifdef CONFIG_VDSO32
        /* Make sure pages are in the correct state */
        vdso32_pagelist = kcalloc(vdso32_pages + 2, sizeof(struct page *),
                                  GFP_KERNEL);
-       BUG_ON(vdso32_pagelist == NULL);
+       if (!vdso32_pagelist)
+               goto alloc_failed;
+
        for (i = 0; i < vdso32_pages; i++) {
                struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
                get_page(pg);
@@ -773,7 +769,9 @@ static int __init vdso_init(void)
 #ifdef CONFIG_PPC64
        vdso64_pagelist = kcalloc(vdso64_pages + 2, sizeof(struct page *),
                                  GFP_KERNEL);
-       BUG_ON(vdso64_pagelist == NULL);
+       if (!vdso64_pagelist)
+               goto alloc_failed;
+
        for (i = 0; i < vdso64_pages; i++) {
                struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
                get_page(pg);
@@ -789,5 +787,14 @@ static int __init vdso_init(void)
        vdso_ready = 1;
 
        return 0;
+
+setup_failed:
+       pr_err("vDSO setup failure, not enabled !\n");
+alloc_failed:
+       vdso32_pages = 0;
+#ifdef CONFIG_PPC64
+       vdso64_pages = 0;
+#endif
+       return 0;
 }
 arch_initcall(vdso_init);
-- 
2.25.0